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Class 9 Science Case Study Questions Chapter 1 Matter in our Surroundings

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Case study Questions in Class 9 Science Chapter 1 are very important to solve for your exam. Class 9 Science Chapter 1 Case Study Questions have been prepared for the latest exam pattern. You can check your knowledge by solving Class 9 Science Case Study Questions Chapter 1 Matter in our Surroundings

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In CBSE Class 9 Science Paper, Students will have to answer some questions based on Assertion and Reason. There will be a few questions based on case studies and passage-based as well. In that, a paragraph will be given, and then the MCQ questions based on it will be asked.

Matter in our Surroundings Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 9 Science Chapter 1 Matter in our Surroundings

Case Study/Passage-Based Questions

Case Study 1: There are three states of matter – solid, liquid, and gas.

Solids have a definite shape, distinct boundaries, and fixed volumes, that is, have negligible compressibility. Solids have a tendency to maintain their shape when subjected to outside force. Solids may break under force but it is difficult to change their shape, so they are rigid.

Liquids have no fixed shape but have a fixed volume. They take up the shape of the container in which they are kept. Liquids flow and change shape, so they are not rigid but can be called fluid.

Gas has an indefinite shape and no fixed volume. Gas gets the shape and volume of the container.Gas has a very low density and hence is light. Gas can flow easily and hence is called fluid.

i.) Which of the following state of matter takes the shape of the container in which it is filled?

d.) Both b and c

Answer: d.) Both b and c

ii.) Distance between particles of matter least in

d.) None of these

Answer: a.) Solid

iii.) Compressibility is least in case of

Case Study 2: Matter is anything that occupies space and has mass. It exists in various forms, such as solid, liquid, and gas. The physical properties of matter, such as shape, size, and state, can be observed and measured. The particles that makeup matter are constantly in motion, and their motion determines the state of matter. In a solid, the particles are tightly packed and have a fixed shape and volume. In a liquid, the particles are close together but can move past each other, giving the substance a fixed volume but no fixed shape. In a gas, the particles are far apart and move freely, allowing the substance to occupy any volume and shape. Matter can undergo changes in its state through the processes of evaporation, condensation, melting, and freezing. Understanding the properties and behavior of matter is essential for studying various scientific phenomena and practical applications in our daily lives.

What is matter? a) Anything that occupies space and has mass b) Anything that is visible to the naked eye c) Anything that is in a solid state d) Anything that is in a gaseous state Answer: a) Anything that occupies space and has mass

What determines the state of matter? a) Physical properties b) Chemical properties c) The motion of particles d) The color of the substance Answer: c) The motion of particles

How are particles arranged in a solid? a) Far apart and move freely b) Close together but can move past each other c) Tightly packed and have a fixed shape d) Tightly packed but have no fixed shape Answer: c) Tightly packed and have a fixed shape

What is the behavior of particles in a gas? a) They are far apart and move freely b) They are close together but can move past each other c) They are tightly packed and have a fixed shape d) They are tightly packed but have no fixed shape Answer: a) They are far apart and move freely

What processes can matter undergo to change its state? a) Evaporation, condensation, melting, and freezing b) Dissolution, combustion, sublimation, and oxidation c) Fermentation, photosynthesis, respiration, and digestion d) Oxidation, reduction, precipitation, and ionization Answer: a) Evaporation, condensation, melting, and freezing

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Case Study Questions Class 9 Science Matter in our Surroundings

Case study questions class 9 science chapter 1 matter in our surroundings.

CBSE Class 9 Case Study Questions Science Matter in our Surroundings. Important Case Study Questions for Class 9 Exam. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Matter in our Surroundings.

At Case Study Questions there will given a Paragraph. In where some Questions will made on that respective Case Based Study. There will various types of marks will given 1 marks, 2 marks, 3 marks or 4 marks.

CBSE Case Study Questions Class 9 Science – Matter in our Surroundings

Case study 1:.

1.) A matter is anything that has mass and occupies space. Pen, paper, clips, sand, air, ice, etc. are different forms of matter. Every matter is made up of small particles. These particles are so tiny that they can’t be seen with naked eyes. Let’s see about the different characteristics of particles of matter.

All matter is made up of very small particles.
.Particles of matter has spaces between them.
Particles of matter are continuously moving.
Particles of matter attract each other.

Answer the following questions by referring above paragraph.

i.) Which of following is not matter?

c.) smell of perfume

d.) None of these

ii.) Thoughts coming in our mind are example of matter. True or false

c.) None of these

iii.) Which of the following is true about particles of matter?

a.) Particles of matter has spaces between them

b.) Particles of matter are continuously moving

c.) Particles of matter attract each other

d.) All of these

iv.) Give 5 examples of matter in our surroundings

v.) Enlist all properties of particles of matter

Answer key-1

iv.) pen, pencil, notebook, ice and water

v.) Different characteristics of particles of matter are

Case Study 2:

2.) There are three states of matter – solid, liquid and gas.

Solids have a definite shape, distinct boundaries and fixed volumes, that is, have negligible compressibility. Solids have a tendency to maintain their shape when subjected to outside force. Solids may break under force but it is difficult to change their shape, so they are rigid.

Liquids have no fixed shape but have a fixed volume. They take up the shape of the container in which they are kept. Liquids flow and change shape, so they are not rigid but can be called fluid.

Gas as has indefinite shape, no fixed volume. Gas gets the shape and volume of container.

Gas has very low density hence are light. Gas can flow easily and hence are called fluid.

i.) Which of the following state of matter takes shape of container in which it is filled?

d.) Both b and c

ii.) Distance between particles of matter least in

iii.) Compressibility is least in case of

iv.) Give properties of solids.

v.) Give properties of Gases.

Answer key-2

iv.) properties of solid are given below

Solid has fixed volume.
Solid has fixed shape.
Solid has high density.
Solids are heavy.
Solid does not flow.

v.) Properties of gases are

Gas has indefinite shape
Gas has no fixed volume.
Gas gets the shape and volume of container.
Gas fills the container completely.
Gas has very low density.
Because of low density gas are light.
Gas can flow easily and hence are called fluid.

Case Study 3:

3.) What happens inside the matter during change of state? On increasing the temperature of solids, the kinetic energy of the particles increases. Due to the increase in kinetic energy, the

Particles start vibrating with greater speed. The energy supplied by heat overcomes the forces of attraction between the particles. The particles leave their fixed positions and start moving more freely. A stage is reached when the solid melts and is converted to a liquid. The minimum temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point.

The temperature of the system does not change after the melting point is reached, till all the ice melts. This happens even though we continue to heat the beaker, that is, we continue to supply heat. This heat gets used up in changing the state by overcoming the forces of attraction between the particles. The amount of heat energy that is required to change 1 kg of a solid into liquid at atmospheric pressure at its melting point is known as the latent heat of fusion. So, particles in water at 0 0 C (273 K) have more energy as compared to particles in ice at the same temperature.

The temperature at which a liquid starts boiling at the atmospheric pressure is known as its boiling point. Boiling is a bulk phenomenon. Particles from the bulk of the liquid gain enough energy to change into the vapour state. A change of state directly from solid to gas without changing into liquid state is called sublimation and the direct change of gas to solid without changing into liquid is called deposition.

i.) A change of state directly from solid to gas without changing into liquid state is called

a.) Sublimation

b.) Deposition

c.) Boiling point

ii.) The direct change of gas to solid without changing into liquid is called

iii.) The energy supplied by heat to solid is used to overcome the forces of attraction between the particles. True or false

iv.) Define melting point and boiling point

v.) Define latent heat of fusion

Answer key-3

iv.) The minimum temperature at which a solid melts to become a liquid at the atmospheric pressure is called its melting point.

The temperature at which a liquid starts boiling at the atmospheric pressure is known as its boiling point.

v.) The amount of heat energy that is required to change 1 kg of a solid into liquid at atmospheric pressure at its melting point is known as the latent heat of fusion.

Case Study 4:

4 .) Do we always need to heat or change pressure for changing the state of matter? Can you quote some examples from everyday life where change of state from liquid to vapour takes place without the liquid reaching the boiling point? In the case of liquids, a small fraction of particles at the surface, having higher kinetic energy, is able to break away from the forces of attraction of other particles and gets converted into vapour. This phenomenon of change of a liquid into vapors at any temperature below its boiling point is called evaporation.

i.) Evaporation of liquid takes place at

a.) Boiling point

b.) Above boiling point

c.) Below boiling point

ii.) Evaporation takes place at surface of liquid because

a.) They are heavy as compare to other particles

b.) They have sufficient kinetic energy to break the force

c.) They are light weight as compare to other particles

iii.) During evaporation particles of liquid change into vapour

a.) From the surface

b.) From the bottom

c.) From all over the liquid

iv.) Define evaporation.

v.) Explain process of evaporation

Answer key-4

iv.) The phenomenon of change of a liquid into vapors at any temperature below its boiling point is called evaporation.

v.) In the case of liquids, a small fraction of particles at the surface, having higher kinetic energy, is able to break away from the forces of attraction of other particles and gets converted into vapour. This phenomenon of change of a liquid into vapors at any temperature below its boiling point is called evaporation.

Case Study 5:

5.) You must have observed that the rate of evaporation increases with–

an increase of surface area:
We know that evaporation is a surface phenomenon. If the surface area is increased, the rate of evaporation increases. For example, while putting clothes for drying up we spread them out.
an increase of temperature:

With the increase of temperature, more number of particles get enough kinetic energy to go into the vapour state.

In an open vessel, the liquid keeps on evaporating. The particles of liquid absorb energy from the surrounding to regain the energy lost during evaporation. This absorption of energy from the surroundings makes the surroundings cold. What happens when you pour some acetone (nail polish remover) on your palm? The particles gain energy from your palm or surroundings and evaporate causing the palm to feel cool. After a hot sunny day, people sprinkle water on the roof or open ground because the large latent heat of vaporization of water helps to cool the hot surface.

i.) Evaporation is surface phenomenon. True or false

ii.) As temperature increases the rate of evaporation is

a.) increases

b.) decreases

c.) remains constant

iii.) The rate of evaporation increases with

a.) Increase in wind speed

b.) Decrease in wind speed

c.) Does not have any effect from wind speed

iv.) What happens when you pour some acetone (nail polish remover) on your palm?

v.) We are able to sip hot tea from saucer than from cup. Why?

Answer key-5

iv.) The particles gain energy from your palm or surroundings and evaporate causing the palm to feel cool.

v.) We are able to sip hot tea from saucer than from cup. This is because saucer has large surface area, due to large surface area as compare to cut area tea evaporates at faster rate.

Thank you It helped me a lot

Why smell of Perfume is not a matter?

Because there is no particle

Because their are perfume particles suspended in air

These all case study questions are really helpful . Thanks

This is my first I was so nervous but these questions help me alot thank you

Smell of perfume is a matter because it have gas particles means perfume particles

Class 9 Science Case Study Questions

Table of Contents

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If you are wondering how to solve class 9 science case study questions, then myCBSEguide is the best platform to choose. With the help of our well-trained and experienced faculty, we provide solved examples and detailed explanations for the recently added Class 9 Science case study questions.

You can find a wide range of solved case studies on myCBSEguide, covering various topics and concepts. Class 9 Science case studies are designed to help you understand the application of various concepts in real-life situations.

The rationale behind Science

Science is crucial for Class 9 students’ cognitive, emotional, and psychomotor development. It encourages curiosity, inventiveness, objectivity, and aesthetic sense.

In the upper primary stage, students should be given a variety of opportunities to engage with scientific processes such as observing, recording observations, drawing, tabulating, plotting graphs, and so on, whereas in the secondary stage, abstraction and quantitative reasoning should take a more prominent role in science teaching and learning. As a result, the concept of atoms and molecules as matter’s building units, as well as Newton’s law of gravitation, emerges.

Science is important because it allows Class 9 Science students to understand the world around us. It helps to find out how things work and to find solutions to problems at the Class 9 Science level. Science is also a source of enjoyment for many people. It can be a hobby, a career, or a source of intellectual stimulation.

Case study questions in Class 9 Science

The inclusion of case study questions in Class 9 science CBSE is a great way to engage students in critical thinking and problem-solving. By working through real-world scenarios, Class 9 Science students will be better prepared to tackle challenges they may face in their future studies and careers. Class 9 Science Case study questions also promote higher-order thinking skills, such as analysis and synthesis. In addition, case study questions can help to foster creativity and innovation in students. As per the recent pattern of the Class 9 Science examination, a few questions based on case studies/passages will be included in the CBSE Class 9 Science Paper. There will be a paragraph presented, followed by questions based on it.

Examples of Class 9 science class case study questions

Class 9 science case study questions have been prepared by myCBSEguide’s qualified teachers. Class 9 case study questions are meant to evaluate students’ knowledge and comprehension of the material. They are not intended to be difficult, but they will require you to think critically about the material. We hope you find Class 9 science case study questions beneficial and that they assist you in your exam preparation.

The following are a few examples of Class 9 science case study questions.

Class 9 science case study question 1

due to its high compressibility
large volumes of a gas can be compressed into a small cylinder
transported easily
all of these
shape, volume
volume, shape
shape, size
size, shape
the presence of dissolved carbon dioxide in water
the presence of dissolved oxygen in the water
the presence of dissolved Nitrogen in the water
liquid particles move freely
liquid have greater space between each other
both (a) and (b)
none of these
Only gases behave like fluids
Gases and solids behave like fluids
Gases and liquids behave like fluids
Only liquids are fluids

Answer Key:

(d) all of these
(a) shape, volume
(b) the presence of dissolved oxygen in the water
(c) both (a) and (b)
(c) Gases and liquids behave like fluids

Class 9 science case study question 2

12/32 times
18 g of O 2
18 g of CO 2
18 g of CH 4
1 g of CO 2
1 g of CH 4 CH 4
2 moles of H2O
20 moles of water
6.022 × 1023 molecules of water
1.2044 × 1025 molecules of water
(I) and (IV)
(II) and (III)
(II) and (IV)
Sulphate molecule
Ozone molecule
Phosphorus molecule
Methane molecule
(c) 8/3 times
(d) 18g of CH 4
(c) 1g of H 2
(d) (II) and (IV)
(c) phosphorus molecule

Class 9 science case study question 3

collenchyma
chlorenchyma
It performs photosynthesis
It helps the aquatic plant to float
It provides mechanical support
Sclerenchyma
Collenchyma
Epithelial tissue
Parenchyma tissues have intercellular spaces.
Collenchymatous tissues are irregularly thickened at corners.
Apical and intercalary meristems are permanent tissues.
Meristematic tissues, in its early stage, lack vacuoles, muscles
(I) and (II)
(III) and (I)
Transpiration
Provides mechanical support
Provides strength to the plant parts
None of these
(a) Collenchyma
(b) help aquatic plant to float
(b) Sclerenchyma
(d) Only (III)
(c) provide strength to plant parts

Cracking Class 9 Science Case Study Questions

There is no one definitive answer to Class 9 Science case study questions. Every case study is unique and will necessitate a unique strategy. There are, nevertheless, certain general guidelines to follow while answering case study questions.

To begin, double-check that you understand the Class 9 science case study questions. Make sure you understand what is being asked by reading it carefully. If you’re unclear, seek clarification from your teacher or tutor.
It’s critical to read the Class 9 Science case study material thoroughly once you’ve grasped the question. This will provide you with a thorough understanding of the problem as well as the various potential solutions.
Brainstorming potential solutions with classmates or other students might also be beneficial. This might provide you with multiple viewpoints on the situation and assist you in determining the best solution.
Finally, make sure your answer is presented simply and concisely. Make sure you clarify your rationale and back up your claim with evidence.

A look at the Class 9 Science Syllabus

The CBSE class 9 science syllabus provides a strong foundation for students who want to pursue a career in science. The topics are chosen in such a way that they build on the concepts learned in the previous classes and provide a strong foundation for further studies in science. The table below lists the topics covered in the Class 9 Science syllabus of the Central Board of Secondary Education (CBSE). As can be seen, the Class 9 science syllabus is divided into three sections: Physics, Chemistry and Biology. Each section contains a number of topics that Class 9 science students must study during the course.

CBSE Class 9 Science (Code No. 086)

Theme: Materials Unit I: Matter-Nature and Behaviour Definition of matter; solid, liquid and gas; characteristics – shape, volume, density; change of state-melting (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation. Nature of matter: Elements, compounds and mixtures. Heterogeneous and homogenous mixtures, colloids and suspensions. Particle nature and their basic units: Atoms and molecules, Law of constant proportions, Atomic and molecular masses. Mole concept: Relationship of mole to mass of the particles and numbers. Structure of atoms: Electrons, protons and neutrons, valency, the chemical formula of common compounds. Isotopes and Isobars.

Theme: The World of the Living Unit II: Organization in the Living World Cell – Basic Unit of life: Cell as a basic unit of life; prokaryotic and eukaryotic cells, multicellular organisms; cell membrane and cell wall, cell organelles and cell inclusions; chloroplast, mitochondria, vacuoles, endoplasmic reticulum, Golgi apparatus; nucleus, chromosomes – basic structure, number. Tissues, Organs, Organ System, Organism: Structure and functions of animal and plant tissues (only four types of tissues in animals; Meristematic and Permanent tissues in plants).

Theme: Moving Things, People and Ideas Unit III: Motion, Force and Work Motion: Distance and displacement, velocity; uniform and non-uniform motion along a straight line; acceleration, distance-time and velocity-time graphs for uniform motion and uniformly accelerated motion, derivation of equations of motion by graphical method; elementary idea of uniform circular motion. Force and Newton’s laws: Force and Motion, Newton’s Laws of Motion, Action and Reaction forces, Inertia of a body, Inertia and mass, Momentum, Force and Acceleration. Elementary idea of conservation of Momentum. Gravitation: Gravitation; Universal Law of Gravitation, Force of Gravitation of the earth (gravity), Acceleration due to Gravity; Mass and Weight; Free fall. Floatation: Thrust and Pressure. Archimedes’ Principle; Buoyancy. Work, energy and power: Work done by a Force, Energy, power; Kinetic and Potential energy; Law of conservation of energy. Sound: Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo.

Theme: Food Unit IV: Food Production Plant and animal breeding and selection for quality improvement and management; Use of fertilizers and manures; Protection from pests and diseases; Organic farming.

PRESCRIBED BOOKS:

Science-Textbook for class IX-NCERT Publication
Assessment of Practical Skills in Science-Class IX – CBSE Publication
Laboratory Manual-Science-Class IX, NCERT Publication
Exemplar Problems Class IX – NCERT Publication

myCBSEguide: A true helper

There are numerous advantages to using myCBSEguide to achieve the highest results in Class 9 Science.

myCBSEguide offers high-quality study materials that cover all of the topics in the Class 9 Science curriculum.
myCBSEguide provides practice questions and mock examinations to assist students in the best possible preparation for their exams.
On our myCBSEguide app, you’ll find a variety of solved Class 9 Science case study questions covering a variety of topics and concepts. These case studies are intended to help you understand how certain principles are applied in real-world settings
myCBSEguide is that the study material and practice problems are developed by a team of specialists who are always accessible to assist students with any questions they may have. As a result, students may be confident that they will receive the finest possible assistance and support when studying for their exams.

So, if you’re seeking the most effective strategy to study for your Class 9 Science examinations, myCBSEguide is the place to go!

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Chapter 1 Class 9 - Matter In Our Surroundings

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Get Notes, NCERT Solutions, Worksheets, Extra Questions, MCQs (with answers) of Chapter 1 Class 9 Science - Matter in our Surroundings.

This is Chapter 1 of our Class 9 NCERT book, and comes under Chemistry Class 9.

In this chapter, we will learn

What is Matter
Physical Nature of Matter
And activity to show particles exist in matter
States of Matter - Solid, Liquid and Gas
Properties of Solids, Liquids and Gases, and their difference
Diffusion in Solids, Liquids and Gases
Interconversion of Different States of Matter
Effect of Pressure on Change of States of Matter
Effect of Temperature on Change of State of Matter
What is Evaporation
What is Vaporisation
What is Condensation
Sublimation - Definition, Real Life Examples
What are fluids

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Concept Notes - With each and every concept explained with images and flow charts.
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Multiple Choice Questions - All types of MCQs including Assertion Reasoning questions, and Case Based Questions (There are questions from NCERT Exemplar as well

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NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings

NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings Intext and Exercises question answers based on rationalised NCERT books published for session 2024-25. Get here the solutions of Page 3, Page 6, page 9, page 10 and Exercises question answers in English Medium and Hindi Medium.

Class 9 Science Chapter 1 Answers in English Medium

Class 9 Science Chapter 1 Exercises
Class 9 Science Chapter 1 Intext Questions
Class 9 Science Chapter 1 MCQ
Class 9 Science Chapter 1 Extra Questions
Class 9 Science Chapter 1 Hindi Medium
Class 9 Science Chapter 1 Notes in English
Class 9 Science Chapter 1 Notes in Hindi
Class 9 Science Chapter 1 NCERT Book
Class 9 Science NCERT Solutions
Class 9 all Subjects NCERT Solutions

NCERT Class 9 Science textbook, Chapter 1 Matter in Our Surroundings covers the most of the important topics. Definition of Matter Characteristics of Matter, three states of matter – Solid, Liquid, and Gas Comparison of the characteristics of these states Interconversion of States of Matter.

The main topics of class 9 science chapter 1 Change of state melting, freezing, evaporation, and condensation Effect of change of temperature on the states of matter. Evaporation : Factors affecting the rate of evaporation Applications of evaporation. Sublimation : Definition of sublimation Examples of substances that sublime. Diffusion : Definition of diffusion Examples of diffusion in daily life Characteristics of Particles of Matter.

Download App for Class 9 all Subjects free. UP Board Solutions, NCERT Solutions, NCERT Solutions Offline Apps 2024-25 are free to download for all students using latest NCERT Books 2024-25. Here you can use NCERT Solutions of chapter 1 of Class 9 Science online or download in PDF file format for offline use. Download Class 9 Science Solutions Apps in Hindi & English version for offline use.

Particles in solids, liquids, and gases. Kinetic Theory of Matter : Explanation of the kinetic theory Explanation of the behavior of particles in matter according to the kinetic theory. Measurement of Matter : Mass and weight measuring the mass of an object Units of measurement. Density and Relative Density : Definition of density Calculation of density Relative density and its applications.

These are the main topics covered in Chapter 1 of the NCERT Class 9 Science textbook. This chapter provides an introduction to the fundamental concepts related to matter and its various properties. It serves as the foundation for further exploration of chemistry and physics topics in the curriculum.

Preparing for NCERT Class 9 Science Chapter 1 Matter in Our Surroundings, or any chapter, requires a systematic approach to understanding the concepts and practicing them effectively. Here are some tips on how students can prepare for this chapter in a better way. Start by reading the chapter carefully from the NCERT textbook. Pay attention to the text, diagrams, and examples provided. While reading, make concise notes of important concepts, definitions, and key points. This will help you with quick revision.

NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings all the in-text questions as well as chapter end exercises question’s answers are given below. Solutions are available in Hindi and English Medium to study online or download in PDF form free.

Ensure that you have a clear understanding of fundamental concepts such as matter, states of matter, and the kinetic theory of matter. Use diagrams and illustrations provided in the book to visualize how particles are arranged in different states of matter and during phase changes. Work through the examples and exercises provided at the end of the chapter. Practice solving numerical problems related to density, and other concepts to reinforce your understanding.

If you find any topics challenging, consult additional resources like reference books, online tutorials, or videos to clarify your doubts. If you have questions or face difficulties in understanding certain concepts, don’t hesitate to seek help from your teacher or discuss them with your classmates. Where possible, perform simple experiments related to states of matter, diffusion, or density to gain practical insights into the concepts. Create Flashcards: Create flashcards for important terms, definitions, and formulas. This can help you with quick revision.

Consistent practice is key to mastering any subject. Allocate regular study time to science and review the chapter periodically. Take self-assessment quizzes or practice tests to gauge your understanding of the chapter. A few days before your exams, revise the chapter thoroughly. Focus on your notes and important points. Keep your notes, textbooks, and other study materials well-organized so that you can easily access them for review.

Science is about exploring and asking questions. Stay curious and be open to learning new concepts and ideas. Remember that understanding the fundamental concepts in Chapter 1 of Class 9 Science is crucial as it forms the basis for more advanced topics in chemistry and physics in the later chapters. Building a strong foundation in this chapter will benefit you throughout your science studies.

Tiwari Academy is an online educational platform that provides resources and materials to help students prepare for their CBSE (Central Board of Secondary Education) Class 9 Science exams, including Chapter 1. Tiwari Academy offers free access to a wide range of study materials, including NCERT solutions, textbooks, revision notes, and practice papers. These materials are designed to help students understand and revise the content effectively.

Class 9 Science Chapter 1 Extra Practice Questions

Why do substance undergo change in physical state.

Substance undergo change in physical state because both inter-particle spaces and inter-particle forces can be changed by changing the condition of temperature and pressure.

When sugar is dissolved in water, there is hardly an increase in volume. Which characteristic of matter is illustrated by this observation?

This is because of the presence of inter particle space or empty spaces. Particles or molecules of water can fill the empty space in the particles or molecules of sugar and vice versa. That is why there is hardly any change in the volume as a result of dissolution of sugar in water.

Define gaseous state of a substance.

A substance is said to be in the gaseous state if under normal pressure, its boiling point is below the room temperature.

How does pressure help in the liquefication of a gas?

Increase in pressure helps in the liquefication of a gas. The particles or molecules of a gas come closer and closer as the pressure is being increased gradually. They ultimately condense and as a result, the gas liquefies or changes into the liquid state.

Solids are generally very heavy while gases are light. Explain.

In the solids, the particle are very closely packed. As a result, the number of particles per unit volume is quite large. Therefore, the solids are normally quite heavy. In the gases, the particles are loosely packed. The number of particle per unit volume is completely small. Therefore, gases are light.

Tiwari Academy offers comprehensive NCERT solutions for Class 9 Science Chapter 1, guiding students step-by-step through exercises in the NCERT textbook. These solutions are invaluable for students, helping them decipher the best ways to tackle diverse problems. The platform might also feature video tutorials that break down intricate concepts of the chapter. By using visual tools and explanations, students can more easily understand challenging subjects.

By working through additional exercises and questions, students solidify their comprehension and enhance their problem-solving capabilities. Tiwari Academy typically provides succinct and organized revision notes, which are instrumental for quick recaps of the chapter’s main ideas and crucial details. Some digital platforms, including Tiwari Academy, even have online exams that emulate the actual test atmosphere, which can be instrumental for student evaluation and exam readiness.

Class 9 Science Chapter 1 Matter in Our Surroundings

Question 1: Solids are normally not compressible. Why can a sponge be readily pressed? Answer 1: A sponge made up of rubber has a large number of fine pores in which air remains filled. When the sponge is pressed, the air from the pores escapes and vacant space are left. Therefore, the sponge can be readily pressed on applying pressure.

Accessible around the clock, Tiwari Academy’s digital tools let students learn at a rhythm that suits them. This constant availability is especially beneficial for those who wish to revisit the chapter several times. Doubt Resolution: Certain online educational platforms grant students the opportunity to post their chapter-related queries. These queries might be addressed by seasoned educators or tutors, offering students needed explanations. Additionally, Tiwari Academy might have archives of past exam papers with their solutions. Working on these papers can assist students in acclimating to the exam structure and honing their time-management skills.

Question 2: Why do we sweat on a humid day? Answer 2: In humid day, the air around us has already high percentage of water vapours. Therefore, the water coming from the skin gets less opportunity to charge into vapours and remains sticking to our body. We therefore, swear more on a humidity day.

Tiwari Academy online platforms have discussion forum where students can interact, share their experiences, and seek advice from peers. It’s important to note that the availability of specific resources and features may vary on Tiwari Academy or any other educational platform. Students should explore the platform to determine which resources are most helpful for their individual learning needs and preferences. Additionally, using a combination of resources, including the official NCERT textbook, school notes, and online materials like Tiwari Academy, can provide a comprehensive approach to exam preparation.

From an examination point of view, NCERT Class 9 Science Chapter 1 Matter in Our Surroundings, holds significant importance for several reasons. Chapter 1 introduces fundamental concepts related to matter, states of matter, and the kinetic theory of matter. These concepts serve as the foundation for understanding more advanced topics in chemistry and physics in higher classes. A strong grasp of these basics is crucial for building a solid scientific knowledge base.

Question 3: Kelvin scale of temperature is regarded as better than the Celsius scale. Give reason. Answer 3: In the Celsius scale of temperature we often come across a negative sign for the temperature (e.g., -8.5⁰C). Since the sign is always positive in the Kelvin scale, it is regarded as better.

Questions from 9th science chapter 1 are often included in Class 9 Science examinations. This chapter is considered an essential part of the curriculum, and students can expect to see questions related to states of matter, properties of matter, and related calculations in their exams. Chapter 1 helps students develop a deeper understanding of how matter behaves, how particles are arranged in different states, and how temperature affects matter. This conceptual understanding is not only essential for exams but also for a broader understanding of science.

The chapter 1 of 9th science includes numerical problems related to density and the states of matter. These problems require students to apply mathematical concepts to scientific scenarios, which is a valuable skill for both exams and real-world applications. The concepts discussed in Chapter 1 are applicable to various everyday situations, such as cooking, weather changes, and material properties. Understanding these applications can help students relate science to their daily lives and answer practical questions in exams.

Important Questions on 9th Science Chapter 1

Naphthalene balls disappear with time without leaving any solid. why.

Naphthalene shows the property of sublimation. Evaporation of naphthalene takes place easily and so it disappears during course of time without leaving a solid.

We can get the smell of perfume sitting several meters away. Why?

Perfumes vaporize very fast and its vapours diffuse into air easily. That is why we can smell perfume sitting several meters away.

Water at room temperature is a liquid. Give reason.

Water at room temperature is a liquid because it has fluidity and has definite volume but no definite shape.

An iron almirah is a solid at room temperature. Give reason.

An iron almirah is a solid at room temperature because it is rigid and has a definite shape.

Why is ice at 273 K more effective in cooling than water at the same temperature?

Ice at 273 K is less energetic than water. It is because of the difference in the latent heat of fusion which is present in water at the same temperature in the form of extra energy.

What produces more severe burns, boiling water or steam?

Steam produces more severe burns than boiling water. This is because steam has more energy than boiling water, present in it in the form of latent heat of vaporization.

Successfully mastering the first chapter of the textbook can boost a student’s confidence in their ability to handle the rest of the science curriculum. It sets a positive tone for the subject and encourages students to explore further. The knowledge gained from Chapter 1 will be built upon in higher classes. Topics like states of matter, kinetic theory, and properties of matter are revisited and expanded upon in later chapters and classes.

A strong foundation in Chapter 1 is, therefore, essential for future success. In summary, NCERT Class 9 Science Chapter 1 is not only important for scoring well in exams but also for laying the groundwork for a deeper understanding of science in the later stages of education. Students should dedicate time and effort to comprehensively learn the concepts presented in this chapter to ensure a strong foundation in science.

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NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings

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Chapter 1 Matter in Our Surroundings NCERT Solutions for Class 9 Science

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Case Study Questions of Class 9 Science PDF Download

Download PDF Case Study Questions of Class 9 Science to prepare for the upcoming CBSE Class 9 Exams Exam 2023-24. With the help of our well-trained and experienced faculty, we provide solved examples and detailed explanations for the recently added Class 9 Science case study questions .

Case study questions are based on real or hypothetical scenarios that require students to analyze, evaluate, and apply scientific concepts to solve problems or make informed decisions. They often present a detailed context, providing students with the opportunity to demonstrate their understanding of the subject matter beyond basic recall.

Table of Contents

Class 9 Science: Case Study Questions

Chapterwise Case Study Questions of Class 9 Science

Case Study Questions for Chapter 1 Matter in Our Surroundings
Case Study Questions for Chapter 2 Is Matter Around Us Pure?
Case Study Questions for Chapter 3 Atoms and Molecules
Case Study Questions for Chapter 4 Structure of Atom
Case Study Questions for Chapter 5 The Fundamental Unit of Life
Case Study Questions for Chapter 6 Tissues
Case Study Questions for Chapter 7 Diversity in Living Organisms
Case Study Questions for Chapter 8 Motion
Case Study Questions for Chapter 9 Force and Laws of Motion
Case Study Questions for Chapter 10 Gravitation
Case Study Questions for Chapter 11 Work and Energy
Case Study Questions for Chapter 12 Sound
Case Study Questions for Chapter 13 Why do we Fall ill
Case Study Questions for Chapter 14 Natural Resources
Case Study Questions for Chapter 15 Improvement in Food Resources

You can find a wide range of solved case studies on cbseexperts, covering various topics and concepts. Class 9 Science case studies are designed to help you understand the application of various concepts in real-life situations.

Class 9 Science Syllabus

Unit I: Matter-Nature and Behaviour

Definition of matter; solid, liquid, and gas; characteristics – shape, volume, density; change of statementing (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation.

Nature of matter: Elements, compounds, and mixtures. Heterogeneous and homogenous mixtures, colloids, and suspensions. Physical and chemical changes (excluding separating the components of a mixture).

Particle nature and their basic units: Atoms and molecules, Law of Chemical Combination, Chemical formula of common compounds, Atomic and molecular masses.

Structure of atoms: Electrons, protons and neutrons, Valency, Atomic Number and Mass Number, Isotopes and Isobars.

Unit II: Organization in the Living World

Cell – Basic Unit of life: Cell as a basic unit of life; prokaryotic and eukaryotic cells, multicellular organisms; cell membrane and cell wall, cell organelles and cell inclusions; chloroplast, mitochondria, vacuoles, endoplasmic reticulum, Golgi apparatus; nucleus, chromosomes – basic structure, number.

Tissues, Organs, Organ System, Organism: Structure and functions of animal and plant tissues (only four types of tissues in animals; Meristematic and Permanent tissues in plants).

Unit III: Motio n, Force, and Work

Motion: Distance and displacement, velocity; uniform and non-uniform motion along a straight line; acceleration, distance-time and velocity-time graphs for uniform motion and uniformly accelerated motion, elementary idea of uniform circular motion.

Force and Newton’s laws: Force and Motion, Newton’s Laws of Motion, Action and Reaction forces, Inertia of a body, Inertia and mass, Momentum, Force and Acceleration.

Gravitation: Gravitation; Universal Law of Gravitation, Force of Gravitation of the earth (gravity), Acceleration due to Gravity; Mass and Weight; Free fall. Floatation: Thrust and Pressure. Archimedes’ Principle; Buoyancy.

Work, Energy and Power: Work done by a Force, Energy, power; Kinetic and Potential energy; Law of conservation of energy (excluding commercial unit of Energy).

Sound: Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo.

Unit IV: Food Production

Plant and animal breeding and selection for quality improvement and management; Use of fertilizers and manures; Protection from pests and diseases; Organic farming.

Books for Class 9 Science Exams

Benefits of Case Study Questions

Enhancing Analytical Skills : Case study questions challenge students to analyze complex scenarios, identify relevant information, and derive meaningful insights. By engaging with these questions, students develop critical analytical skills that are essential for scientific thinking and problem-solving.
Promoting Critical Thinking : Case study questions encourage students to think critically and evaluate different perspectives. They require students to reason, make logical deductions, and justify their answers with supporting evidence. This process helps in honing their critical thinking abilities, enabling them to approach problems from multiple angles.
Encouraging Practical Application of Concepts : By presenting real-world or hypothetical situations, case study questions promote the application of scientific concepts in practical scenarios. This application-based approach fosters a deeper understanding of the subject matter and helps students see the relevance of what they learn in the classroom to everyday life.

Case study questions of Class 9 Science provide students with an opportunity to apply their knowledge, enhance analytical skills, and think critically. By understanding the format, benefits, and effective strategies for answering case study questions, students can excel in this form of assessment. While challenges may arise, practicing time management, improving information extraction skills, and enhancing observation abilities will enable students to overcome these obstacles and perform well. Embracing case study questions as a valuable learning tool can contribute to a holistic understanding of scientific concepts and foster problem-solving abilities.

1. What is the purpose of case study questions in Class 9 Science?

Case study questions serve the purpose of evaluating a student’s understanding of scientific concepts, their ability to apply knowledge in real-life situations, and their analytical and critical thinking skills.

2. How can case study questions help improve analytical skills?

Case study questions require students to analyze complex scenarios, identify relevant information, and derive meaningful insights. Regular practice with such questions can significantly enhance analytical skills.

3. Are case study questions difficult to answer?

Case study questions can be challenging due to their comprehensive nature and the need for critical thinking. However, with practice and effective strategies, students can develop the skills necessary to answer them effectively.

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Important Questions for CBSE Class 9 Science Matter in Our Surroundings 2023-24

CBSE Class 9 Science Chapter-1 Important Questions - Free PDF Download

Chapter 1 of science in class 9 talks about matters of our surroundings. Many students consider science as a difficult and challenging subject as they face difficulty in understanding the concepts and theories of this subject. The best way to overcome this problem is to start practising Class 9 Science chapter 1 important questions. Solving these questions regularly will help the students to improve their skills on this subject. Thus, scoring good marks in the exams becomes easy for them. M atter in our surroundings class 9 important questions guides students in their preparation to make them efficient. Vedantu is a platform that provides free CBSE Solutions (NCERT) and other study materials for students. Maths Students who are looking for the better solutions, they can download Class 9 Maths NCERT Solutions to help you to revise complete syllabus and score more marks in your examinations.

Download CBSE Class 9 Science Important Questions 2023-24 PDF

Also, check CBSE Class 9 Science Important Questions for other chapters:

Important Questions of Ch 1 Science Class 9 - Free PDF Download

Very Short Answer Questions 1 Mark

1. Which of the following matter?

Chair, air, love, smell, hate, almonds, thought, cold, cold drink, the smell of perfume.

Ans: As we can define matter as any ‘physical substance’, hence almonds, air, chair, the smell of perfume, cold drink and smell can be considered as matter.

2. Convert the following temperature to a Celsius scale:

i) The temperature is 300 K.

Ans: When we use: K = 273 + ⁰C:

⁰C = K - 273

= 300 - 273

= 27⁰C

ii) The temperature is 573 K

⁰C = 573 - 273

= 300 ⁰C

3. What is the physical state of water at:

(a) A temperature of 250 ⁰C

Ans: The boiling point of water is 100 ⁰C, hence the physical state of water at 250⁰C will be gaseous.

(b) A temperature of 100 ⁰C

Ans: The boiling point of water is 100 ⁰C, hence at 100 ⁰C water is in the gaseous state.

4. For any substance, why does the temperature remain constant during the change of state?

Ans: The reason behind the temperature of substance or matter remaining constant during a change of state is that during the change of state all of the heat or energy provided to particles of matter is utilized to take the particles of matter apart from each other.

5. Suggest a method to liquefy atmospheric gases.

Ans: One method to liquefy atmospheric gases is to decrease the temperature and increase the pressure.

6. Arrange the following substances in increasing order of forces of attraction between the particles— water, sugar, and oxygen.

Ans: The order of increasing forces of attraction between the particles is as follows:

Oxygen< water< sugar.

7. What is the physical state of water at-

(a) A temperature of 25 ⁰C?

Ans: The physical state of water at 25 ⁰C is liquid.

(b) A temperature of ⁰C?

Ans: The physical state of water at ⁰C is solid.

Ans: The physical state of water at 100⁰C is gas.

8. If the humidity in the air increase then the rate of evaporation:

(a) decrease

(b) increase

(d) both (b) and (a) depending upon the temperature

Ans: The correct option is (a) decrease.

9. Which of the following statements is correct?

(a) boiling is a bulk phenomenon and evaporation is a surface phenomenon (b) boiling is a surface phenomenon and evaporation is a bulk phenomenon (c) boiling and evaporation both are a surface phenomenon

(d) boiling and surface both are bulk phenomenon

Ans: The correct option is (a) boiling is a bulk phenomenon and evaporation is a surface phenomenon.

10. If the temperature of a place is increase then evaporation:

(d) none of the above

Ans: The correct option is (b) increase.

11. Which of the following has the least inter atomic spacing?

(a) solid

(b) liquid

(d) plasma

Ans: The correct option is (a), solid.

12. If you decrease the surface area and increase the temperature, then the rate of evaporation

(a) increase

(b) decrease

(d) may increase or decrease depending upon other factors

Ans: The correct option is (c), remain the same.

13. What will be the corresponding temperature in degree centigrade for 300 K:

(a) 30 ⁰C

(b) 300 ⁰C

(d) 673 ⁰C

Ans: The correct option is (c), 27 ⁰C.

14. Liquid to gas and gas to liquid changes are called:

(a) vaporization and condensation

(b) condensation and vaporization

(d) condensation and sublimation

Ans: The correct option will be (a), vaporization and condensation.

15. Physical state of water at is respectively

(a) liquid, solid, and gas

(b) solid, liquid, and gas

(d) gas, solid, and liquid

Ans: The correct option is (a), liquid, solid and gas.

Short Answer Questions 2 Marks

1. Give reasons for the following observation:

The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close.

Ans: When it is a higher temperature the diffusion rate (movement) of particles will be very fast when compared to the diffusion rate of particles at a lower temperature and since the temperature of hot sizzling food is higher than cold food, the smell of hot sizzling food will be reaching us from several meters away.

2. The mass per unit volume of a substance is called density. (density = mass/volume).

Arrange the following in order of increasing density – air, exhaust from chimneys, honey, water, chalk, cotton, and iron.

Ans: The correct order of increasing densities of the substances is as follows: Air < exhaust from chimneys< cotton< water< honey< chalk< iron.

3. Liquids generally have a lower density as compared to solids. But you must have observed that ice floats on water. Find out why.

Ans: Ice floats on the water since there is a large empty space inside the 3D structure of ice due to which it becomes less in weight as compared to water and can float on water.

4. Why does a desert cooler cool better on a hot dry day?

Ans: In a desert cooler, when hot air enters through the straw mates it evaporates the water at a fast rate because the rate of evaporation is faster on a hot dry day. And because of the faster evaporation rate, it cools the air more conveniently than on a dry hot day.

5. How does the water kept in an earthen pot (matka) become cool during summer?

Ans: Evaporation happens through the small pores on it causing a cooling effect, in an earthen pot. Therefore water kept in an earthen pot becomes cool during summer because of continuous evaporation.

6. Why does our palm feel cold when we put some acetone or petrol or perfume on it?

Ans: As a perfume, petrol and perfume are volatile liquids, if put on our palm they will be absorbing heat from our palm and cause cooling.

7. Why are we able to sip hot tea or milk faster from a saucer rather than a cup?

Ans: When we use a saucer instead of a cup the surface for evaporation to occur will be increased resulting in faster evaporation of particles of tea or milk and allowing it to cool faster and taking a sip becomes easier.

8. What type of clothes should we wear in summer?

Ans: We must wear the type of clothes which allow easy evaporation since evaporation causes cooling. And as the cotton absorbs sweat well and allows easy evaporation, we must prefer wearing cotton clothes in summer.

9. Convert the following temperatures to the Celsius scale.

a) The temperature is 293 K

Ans: When we use: ⁰C = K - 273

= 293 - 273

= 20 ⁰C

b) The temperature is 470 K

= 470 - 273

= 197 ⁰C

10. Convert the following temperatures to the Kelvin scale.

a) The temperature is 25 ⁰C

Ans: When we use: K = ⁰C + 273

= 25 + 273

= 298 K

b)The temperature is 373 ⁰C

= 373 + 273

= 656 K

11. Give a reason for the following observations.

a) Naphthalene balls disappear with time without leaving any solid.

Ans: Sublimation can be defined as the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage. Naphthalene balls will be having the property of sublimation because of which they directly vary from solid to gaseous state without a conversion into liquid. Hence, naphthalene balls will be vanishing with time leaving no solid.

b)We can get the smell of perfume sitting several meters away.

Ans: Volatile substances such as perfumes change from liquid state to gaseous state very fast which allows them to diffuse and mix up with the air particles to reach our nostrils. Therefore we get the smell of perfume sitting several metres away.

12. Give two reasons to justify -

a) Water at room temperature is a liquid.

Ans: For a temperature of <0 ⁰Cwater is in solid-state, for 0⁰C → 100⁰C → water is in a liquid state and for temperature >100 ⁰C water is in a gaseous state. Since room temperature always lies between 0 ⁰C and 100 ⁰C and within this range the physical state of water is liquid so water is liquid at room temperature.

b) An iron almirah is a solid at room temperature.

Ans: Since the room temperature is very less than the melting point of iron hence an almirah made up of iron will be a solid at room temperature.

13. Why is ice at 273 K more effective in cooling than water at the same temperature?

Ans: Ice will be producing a more intense cooling effect as compared to water at 273 K because at 273 K ice will be absorbing latent heat of melting from the surroundings and will be getting converted into water. Therefore ice at 273 K is more effective in cooling than water at the same temperature.

14. What produces more severe burns, boiling water or steam?

Ans: When the steam gets converted into boiling water it releases latent heat of water which results more severe burns when we compare it to boiling water.

15. What is evaporation? What are the factors affecting it?

Ans: Evaporation can be defined as the process of conversion of a substance from its liquid state to a gaseous state at any temperature below its boiling point.

Evaporation will be dependant on the factor below:

a) Surface area

b) Temperature

c) Humidity

d) Wind speed

16. What happens when we apply pressure to the particles of matter?

Ans: Pressure can be defined as the force applied per cross-sectional area. Therefore when we apply pressure to the particles of matter, the force applied brings the particles closer to each other.

17. Define latent heat of vaporization and latent heat of fusion.

Ans: The heat energy required to change 1 kg of a substance from its liquid state to a gaseous state at atmospheric pressure without changing its temperature is known as latent heat of vaporization.

18. If the melting point of object A is high then what state do you expect it to be at room temperature?

Ans: The temperature at which a substance changes its state from solid to liquid is called its melting point. At a temperature below melting point, the substance will be in solid-state. Therefore, if the melting point of an object A is high then the object will be in solid-state.

19. What happens when the temperature of the solids increase?

Ans: When we increase the temperature of the solid, we are giving energy to it. That energy is utilized in increasing the kinetic energy of the particles and as a result, the speed of the particles is increased and they vibrate more freely. Once the particles overcome the force of attraction between them they start moving more freely.

20. When heat is being supplied to a solid, then what does the heat energy do to the particles of the solid?

Ans: The heat energy increases the kinetic energy of the particles which allows the particles to overcome the forces of attraction and start moving more freely and changing the state from solid to liquid.

21. Why is it that on increasing the wind speed the rate of evaporation increases?

Ans: If we increase the speed of the wind, then they will be blowing away with them. The water vapours in the air are blown away when the speed of wind is increased, making room for more water vapours and increasing the rate of evaporation.

22. Why do we say that evaporation is a surface phenomenon?

Ans: Only the particles at the surface of the liquid absorb energy and get converted into vapours, therefore evaporation is called a surface phenomenon.

Long Answer Questions 3 Marks

1. A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?

Ans: It is given that a diver is able to cut through water in a swimming pool. This is representing that the particles of water will be held together by weak forces of attraction between them and when any external force is applied the particles can be separated.

2. What are the characteristics of the particles of matter?

Ans: The particles of matter have the following characteristics:

i. The particles of matter are in continuous motion.

ii. There are gaps between the particles of matter.

iii. There is a force of attraction between the particles of matter which keeps them together.

(a) Tabulate the differences in the characteristics of states of matter. Ans: Tabular differences in characteristics of matters are given below:

(b) Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy, and density.

Rigidity → The property of matter to maintain its shape when external forces are applied to it is known as rigidity. Solids have this property.

Compressibility → The property of matter to allow compression when high pressure is applied to it is known as compressibility. Some Liquids and all gases have this property.

Fluidity → The property of matter to flow and change in its shape when external forces are applied to it is known as fluidity. Both liquids and gases have this property.

Filling a gas container → Gases are fluid in nature and are highly compressible which allows them to be filled within a vessel at high pressure. A large volume of gas can be filled in a container of less volume making it suitable and more cost-efficient for transportation.

Shape → Only solid objects have well-defined shapes while liquids can acquire any shape depending on the container they are kept in and gases don’t have any shape.

Kinetic energy → The particles of a matter are continuously in motion and thus have kinetic energy. As the particles in solids have the least movement, the kinetic energy of solids is the least. The particles of gases have the freest movements and hence they have the highest kinetic energy. The order of kinetic energies for different types of matters is: solid < liquid < gas

Density → Density of any substance can be explained as Mass per unit volume i.e. density = mass/volume.

4. Give reasons

(a) A gas fills completely the vessel in which it is kept.

Ans: The particles of gas have negligible attraction force between them because of which the particles move freely in all directions filling the whole container the gas is kept in.

(b) A gas exerts pressure on the walls of the container.

Ans: The particles of gas move freely due to which they collide with the container walls continuously and randomly. Therefore the collision of particles on the container walls exerts pressure on the walls.

Ans: Solids have rigid and fixed particles and have a definite shape and clear boundaries. Since a wooden table possesses all the qualities of a solid, it should be called a solid.

(d) We can easily move our hand in the air but to do the same through a solid block of wood we need a karate expert.

Ans: Since air is a gas and the forces of attraction between the particles of gas are very less which makes it easy to separate the particles with the help of an external force and hence we can easily move our hand in the air. Whereas in the case of solids the forces of attraction are very strong and we need a very high force to separate the particles of a solid and hence we need a karate expert for it.

5. Name A, B, C, D, E, and F in the following diagram showing changes in its state.

A is fusion or heating or melting.

B is vapourisation.

C is cooling or Condensation.

D is cooling or solidification.

E is sublimation.

F is solidification.

6. Are the three states of matter inter-convertible? How can they interconnect?

Ans: Yes, the three states of matter can be converted into each other.

The three states of matter are interconvertible as shown below:

a) By heating we can convert solids into liquids and by cooling we can convert liquids into solids.

b)We can convert liquids into gases by vaporization and we can convert gases to liquids by condensation.

c) Using sublimation we can convert solids into gases and vice versa and using condensation we can convert liquids into solids.

7. How does evaporation cause cooling?

Ans: During evaporation, the particles of a liquid absorb the heat from the surface and are converted into vapours utilizing the absorbed heat. This absorption of heat from the surface will be producing a cool surface.

8. Why should we wear cotton clothes in summer?

Ans: Since cotton is a good absorbent of water, it absorbs all the sweat from our body and allows easy and fast evaporation. The sweat absorbs heat from our body and evaporates which makes us feel cooler during a hot summer day. That is why we should wear cotton clothes in summer.

9. Differentiate between physical and chemical change?

Ans: The difference physical and chemical change is given below

10. A solution of H₂SO₄ is labeled 40%. The density of the solution is 1.3 gm/l. What is the concentration of the solution in %(m/v)?

Ans: The given concentration of the solution is 40%.

Therefore, 100 gm of the solution contains 40 g of H₂SO₄

Density = \[\frac{mass}{volume}\]

1.3gm/l = \[\frac{100 g}{volume}\]

Volume of the solution = \[\frac{100}{1.3}\]

= \[\frac{100}{1.3}\] ml

So, = \[\frac{100}{1.3}\] of the solution contains 40g of H₂SO₄

Therefore, 100 ml of solution will contain \[\frac{100 \times 40 \times 1.3}{100}\] g of H₂SO₄

= 52 g of H₂SO₄

Therefore, the concentration is 52% (m/v).

11. What is the state of inter particle distance inside a solid, liquid, and gas?

Ans: In a solid, the forces of attraction between the particles are very high and hence the particles of a solid will be very close to each other and the inter particle distance is the least.

In a liquid, the forces of attraction between the particles are very weak, and therefore the particles of a liquid will not be closely packed with each other and the inter-particle distance is large.

In a gas, the forces of attraction between the particles are almost negligible or extremely weak and therefore the particles of a gas are very loosely packed and are very far from each other and the inter particle distance is largest.

12. Why is it that to smell cold food, we have to go close but the smell of hot food reaches us several meters away?

Ans: When the particles are at higher temperature, their movements are fast and therefore they can travel up to several meters. Hence the hot food’s smell will be reaching us several meters away.

At lower temperatures, the movements of particles are not very fast and particles do not have enough kinetic energy to travel a distance of several meters. Therefore we have to go close to smell cold food.

13. Why is it that a wooden chair should be called a solid and not a liquid?

Ans: A wooden chair is a rigid object, the particles of a wooden chair are tightly packed with each other, the chair has a definite shape and the chair has negligible compressibility. Since a wooden chair possesses all the properties of a solid and not of a liquid, it should be called a solid, not a liquid.

14. Give an experiment to show that ammonium chloride undergoes sublimation.

Ans: Experiment for representing the sublimation of ammonium chloride (NHCl₄):

a) Take a crystal of ammonium chloride (NHCl₄) inside a china dish and an inverted funnel.

b) With the help of a burner, heat the ammonium chloride (NHCl₄) crystals.

c) When the ammonium chloride (NHCl₄) crystal is heated, vapours of (NHCl₄) and the Ammonium chloride (NHCl₄) which is solidified along the walls at the beaker’s upper end is observable.

d) This experiment shows that solid ammonium chloride (NHCl₄) undergoes solidification. It directly changes to vapour state from a solid state, it does not convert into liquid.

Setup to show Ammonium chloride undergoes sublimation

15. What is distillation and fractional distillation? What is the basic property that separates the two methods?

Ans: The process of distillation is used for separating the components of a mixture containing two liquids, having different boiling points and both liquids boil without decomposition.

The process of fractional distillation is used for separating the components of a mixture containing more than two liquids having a boiling point difference of less than 25 K.

The basic property that separates these two methods is:

Using distillation we can separate only those components which have a significant difference in their boiling points. While fraction distillation is used when the difference in boiling points is less.

Many students don’t have a strong core knowledge on the subject of science and face difficulty in understanding the basics of the chapters. Due to which they lose a lot of marks in the final exams. To avoid these, students need to formulate a better preparation plan where they should give more emphasis to the practice of class 9th science chapter 1 important questions. Regular practice will help them to improve and be more confident about their own knowledge.

The questions that are included in chapter 1 science class 9 important questions are most likely to come in the exams. Thus, preparing the students better and efficient. Students can download the pdf of class 9 chapter 1 science important questions from the Vedantu site. This pdf is available for free. After downloading the pdf, students can refer to it at every stage of their preparation.

Important Question of Science Class 9 Chapter 1

Students will learn a lot of things from the chapter 'matters in our surroundings, let's discuss some of those things:

The matter is considered as a substance from which our cosmos is made of. Any substance with some mass, that takes volume and which can get comprehended by the senses is termed as a matter. There are a lot of exceptions in this case such as heat, light energy, electrical energy, sound energy, magnetism, vacuum, and shadow. This all is not considered a matter because they don't have mass and they don't take any place.

The substance 'matter' is believed to be composed of small constituent parts. Matters have minimal and minute units. Taking a glance on them is very difficult even with a high-power microscope.

To understand more simply, everything around you is made up of matter. Atoms and compounds of everything are made with small parts of matter. These atoms are responsible for building the things that we see and touch every day.

Characteristics of Matter

The different characteristics of matter are listed below:

The matter is a substance which is made up of small particles.

It is believed that the particles consist of intermolecular spaces between them.

The particles in the matter have a locomotive nature due to the kinetic energy inside them. When there is a surge in the temperature, the motion of particles intensifies.

The bits in the matter attract each other, but this reciprocal force of full becomes operational only when the particles are very close to each other. In solids, the particles are firmly held, which is why it is believed that they have a superior force of attraction. Whereas in gases, particles are loosely held; thus, they have a minimal force of attraction.

Nature of Matter

Depending upon the physical state of different materials or substances, the nature of matter is classified into three categories:

Solids are substances where the particles are held very close to each other due to a strong intermolecular force. The particles are so tightly held at their place that they can have only vibratory motions and nothing else. As the particles are tightly held, therefore solids have a definite shape and definite volume. Some examples of solids are wood, iron, glass, etc. Students while practising important question of science class 9 chapter 1 will learn more about this substance and that too in a straightforward way.

Those substances where the intermolecular forces are weak enough to allow the movement of particles are generally known as liquids. These particles are also closely held with each other, but they have more freedom of movement than the particles of solid. Liquids are substances with a definite volume but with no definite shape. These substances generally take the shape of the container in which they are stored. Some examples of liquid substances are milk, water, etc. To gain more detailed knowledge on this particular substance, students have to continue practising ch 1 science class 9 important questions without fail.

These types of substances have very weak intermolecular forces between their particles or molecules, so the molecules have the freedom to move. The distance between each particle in a gas is bigger if compared to the distance between particles in solids and gases. Gases do not have a fixed shape or a definite volume. These substances fully occupy the containers in which they are stored. Some examples of gases are air, hydrogen, oxygen, methane, etc. By practising important questions for class 9 science chapter 1 regularly, students can gain more knowledge on this particular substance.

These above three states of matter can be transformed from one form to the other just by changing the environment's temperature and pressure conditions. The composition of matter is also used to determine its nature. If a matter is composed of more than one particle, then it is considered as a mixture, but when it contains only one particle, then it is termed as a pure substance. Mixtures are further classified into homogeneous and heterogeneous categories. Pure substances can also get divided into elements and compounds.

All the information that you have read till now are some basics of the chapter 'Matter in our surroundings. But there is more to this chapter, and things will get complicated after getting inside the different topics of the chapter. Students find the theories of this chapter complicated and thus are incapable of scoring good marks, but by practising class 9 science chapter 1 important questions regularly, students can avoid fewer marks.

Matter in Our Surroundings Class 9 Important Questions

Some of the important questions that the students might face in the exams are as follows:

Mention the technique which is used for separating the substances from the mixture.

What is the difference between a homogeneous mixture and a heterogeneous mixture?

What do you understand by the term Matter?

State the different characteristics of matter.

What is the nature of matter? Explain in a brief way.

State the points which show that a physical Change is different from a chemical change.

What are the reasons which cause a matter to change its state from one form to another?

What do you understand by the term element?

What do we call a mixture of salt and sugar in our regular lives?

State the three states of matter based on the distance between the molecules.

State the process using which the seawater can get purified.

What are the properties of a solid?

State the properties of a liquid.

Mention the properties of a gas.

Which state of matter is related to Boyle's law.

CBSE Class 9 Chapter 1 MCQs

1. Due to which among the following phenomena, the water kept in the earthen pot becomes cool during summers?

Transpiration

Evaporation

2. Which of the following conditions will increase the evaporation of water?

Increase in temperature of the water

Decrease in temperature of the water

Less exposed surface area of water

Adding common salt to the water

3. Which of the following is the boiling point of water at sea level?

Answers: 1 (d), 2 (a) and 3 (c)

Benefits of Class 9th Science Chapter 1 Important Questions

Students who are facing problems in chapter 1 of class 9 are suggested to practice important questions of ch 1 science class 9 so that they can take advantage of this and prepare well. Some of the benefits of this list of questions are:

The questions are taken keeping in mind the syllabus and the format imposed by the CBSE board for class 9 students because any deviations from that can cost students a lot of marks.

The questions are selected under the guidance of some expert teachers who have years of experience in this field. They select questions according to the intellectual capability of the students.

The questions included in the list of chapter 1 science class 9 important questions are most likely to come in the exams, thus making students' preparation better and efficient.

The questions are given with solutions which are explained in a detailed manner.

Important Related Links for CBSE Class 9

Conclusion .

In conclusion, the availability of important questions for CBSE Class 9 Science Matter in Our Surroundings is a valuable resource for students preparing for their examinations. These important questions cover key topics and concepts related to the chapter, helping students deepen their understanding of the properties of matter, changes of state, and the behavior of particles. Practicing some important questions, students can enhance their knowledge and improve their problem-solving skills. These questions encourage critical thinking and application of scientific principles, preparing students to answer exam questions effectively.

Engaging with these important questions enables students to consolidate their understanding of the chapter, identify areas where they need further clarification, and strengthen their grasp of the subject. They also serve as a valuable revision tool, helping students review and reinforce the concepts they have learned.

FAQs on Important Questions for CBSE Class 9 Science Matter in Our Surroundings 2023-24

1. Where can I find extra questions for CBSE Class 9 Science Chapter 1- Matter in Our Surroundings?

There are several e-learning sites that provide more practice questions. On Vedantu, you may find the most frequently asked questions for each scientific chapter. Vedantu is a leading learning portal that offers all of the required exam preparation materials such as example papers, NCERT Answers, crucial questions, revision notes, and so on. Important questions for Chapter 1- Matter in Our Surroundings and other chapters, as well as solutions, are available on Vedantu's website for Class 9 CBSE students. Subject matter experts with sufficient expertise and experience in the topic prepare the replies. The key CBSE Class 9 Science Chapter 1 questions have been prepared in a PDF file for students to practice before examinations.

2. What are the two recently discovered states of matter?

Apart from the three-commonly known states of matter, there exist other two states of matter which are much talked about: Plasma and Bose-Einstein Condensate.

Plasma: Plasma state is the 4th state of matter which is an ionized gas. Plasma neither has a definite volume nor a definite shape. It can be defined as a gaseous substance into which sufficient energy is provided to free electrons from atoms or molecules and to allow both species i.e. ions or electrons to co-exist. Examples of plasma are Stars, lightning, etc. Plasma is also present inside the fluorescent lights.

Bose-Einstein Condensate: Bose-Einstein Condensate (BEC) is a state of matter of a dilute gas of bosons (a boson is a particle that follows Bose-Einstein Statistics) cooled to a temperature very close to absolute zero. In simple words, BEC is formed by cooling a gas of extremely low density.

3. Can matter exist in all three states?

Indeed, materials may exist in all three states at the same time. At differing temperature and pressure circumstances, the three states of matter interconvert. In other words, pressure and temperature determine the state of a substance, i.e. whether it is solid, liquid, or gas. As water boils, it turns into vapour, and when it freezes at its freezing point, it turns into ice. It is critical to realise that the difference between different states of matter is caused by the location of component particles. As a result, these particles' characteristics can alter as a result of temperature and pressure.

4. What is the difference between boiling and evaporation?

Boiling is a bulk phenomenon whereas evaporation is a surface phenomenon. Particles from the bulk of the liquid change into vapour state in the process of boiling. However, in the process of evaporation, particles from the surface change into the vapour state by gaining enough energy from the atmosphere that weakens the force of attraction present into the liquid to change it into vapour form.

5. What is the significance of using Vedantu’s Important Questions for studying Chapter 1 Matter in Our Surroundings of Class 9 Science?

Every crucial question from the Chapter- Matter in our Surroundings has been hand-picked by Vedantu's expert pros. Vedantu's Crucial Questions for Chapter 1 Matter in Our Surroundings of Class 9 Science has around 50 critical questions from the course. In tests, these questions are worth one to five points. Working through these questions will give you with the necessary chapter revision. It will also assist you in understanding how to develop optimal replies for various exam questions.

6. What are some important questions from Chapter 1 Matter in Our Surroundings of Class 9 Science for exams?

Matter in Our Surroundings contains many important experiments, definitions, and reasoning questions that can be asked in the exams. Some of the examples of these questions are as follows:

Enlist the characteristics of particles of matter.

Suggest a method to liquefy gases.

Why is it that on increasing the wind speed the rate of evaporation increases?

Define latent heat of vaporization and latent heat of fusion.

For over 50 such important questions from this chapter, visit Vedantu .

7. Are the important questions for Chapter 1 Matter in Our Surroundings of Class 9 Science accessible offline?

Yes, the important questions for Chapter 1 Matter in Our Surroundings of Class 9 Science are easily accessible offline by downloading its PDF file in the following simple steps.

Visit Vedantu and choose the subject and the chapter you want.

On the subsequent page, scroll down and look for the option to "Download PDF."

This will redirect you to a new page containing the link to download the required PDF promptly.

For an even smoother download process, install the Vedantu mobile app and access all the content easily from your phone.

8. How can you show that one crystal of potassium permanganate contains millions of tiny particles?

Dissolve two or three crystals of potassium permanganate and dissolve them in 100 ml of water. Take 10 ml of this solution and put it in another container with 90 ml of water. Take 10 ml of this new solution and again dissolve it in 90 ml of water. Dilute the solution six to eight times. You will find that water still remains coloured after much dilution. This proves that one crystal of potassium permanganate must contain millions of tiny particles that keep on dividing in the water.

9. How can evaporation cause cooling? Give examples.

As a liquid evaporates, its particles collect energy from the surrounding environment in order to recoup the energy lost during evaporation. As energy is taken from the surroundings, the surroundings get colder. In the summer, for example, people sprinkle water over the roofs of buildings to keep them cool. Our body's sweating system functions similarly. As we perspire on a hot day, our perspiration evaporates, which helps to lower our body temperature.

CBSE Class 9 Science Important Questions

Cbse study materials.

Extra Questions for Class 9 Science Chapter 1 Matter in Our Surroundings

Extra questions for Class 9 Science Chapter 1 Matter in Our Surroundings with answers is given below. Our subject expert prepared these solutions as per the latest NCERT textbook. These questions will be helpful to revise the all topics and concepts. CBSE Class 9 extra questions are the most simple and conceptual questions that are prepared by subject experts for the students to study well for the final exams. By solving these extra questions, students can be very efficient in their exam preparations.

Matter in Our Surroundings Class 9 Science Extra Questions and Answers

Very short answer questions.

1. Define matter. Answer: Anything that occupies space and has mass is called matter.

2. State different states of matter with an example. Answer: Matter has 3 different states (i) Solid (ii) liquid (iii) gas

3. What is diffusion? Answer: The intermingling of molecules of one substance with that of the other is called diffusion.

4. What happen to the rate of diffusion if the temperature is increased? Answer: With increased temperature, the rate of diffusion also increases as the particles gain energy and vibrate more.

5. Name the state of matter that have the tendency to maintain their shape when subjected to outside force. Answer: Solid.

6. Define melting point. Answer: The temperature at which a solid melts to become liquid at the atmospheric pressure is called its melting point.

7. Define boiling point. Answer: The temperature at which a liquid starts boiling at the atmospheric pressure is known as its boiling point.

8. Define latent heat of vaporization. Answer: Latent heat of vaporization is the heat energy required to change 1 kg of a liquid to gas at atmospheric pressure at its boiling point.

9. Define latent heat of fusion. Answer: Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its melting point.

10. Define sublimation. Answer: Sublimation is the change of gaseous state directly to solid state without going through liquid state and vice-versa.

11. What is dry ice? Answer: Solid carbon dioxide obtained by cooling and applying pressure on carbon dioxide gas. It does not melt so it is called dry ice.

12. What is humidity? Answer: The air holds water vapour, this air with water is called humid air and the phenomenon is called humidity.

13. Give two properties of solid. Answer: (1) Solids have fixed shape and are rigid. (2) Solids cannot be compressed.

14. What will happen if the pressure is reduced on solid carbon dioxide (dry ice)? Answer: If the pressure is reduced on solid carbon dioxide it will directly change into gaseous state without melting.

15. Name any three substances that show sublimation. Answer: Ammonium chloride, camphor and naphthalene balls.

16. Sponge is solid, but we can still compress it. Why? Answer: Sponge is a solid with minute pores in it. When we press the sponge the air present in these pores is released out and hence we are able to compress it.

17. What is normal atmospheric pressure? Answer: The atmospheric pressure at sea level is 1 atmosphere and taken as the normal atmospheric pressure.

18. What is Kelvin? Answer: Kelvin is the SI unit of temperature (0°C = 273 K).

19. Give two examples of diffusion. Answer: Milk drops dissolved in water and perfume sprayed in a room.

20. Give the temperature at which water exists in two different phases/states. Answer: At 0°C water can be in solid or in liquid state. At 100°C water can be in liquid or in gaseous state.

Short Answer Type Questions

1. Why do we see water droplets collected on the outer surface of a glass container, containing ice?

Answer: The water vapour present in air, comes in contact with the cold outer surface of the container thereby condensing it to form water droplets.

2. Explain why solids have fixed shape but liquids and gases do not have fixed shape.

Answer: Solids have fixed shape due to strong intermolecular force of attraction between them. The liquids and gases have molecules with less intermolecular force of attraction and hence they can flow and take shape of the container.

3. Liquids and gases can be compressed but it is difficult to compress solids. Why?

Answer: Liquids and gases have intermolecular space, on applying pressure externally on them the molecules can come closer thereby minimizing the space between them. But in case of solids there is no intermolecular space to do so.

4. A balloon when kept in sun, bursts after some time. Why?

Answer: The balloon has air filled in it. The balloon when kept in sun gets heated and the air inside it also gets heated. The molecules of air get energy, and vibrate faster thereby exerting large force on the walls of the balloon. Due to this expansion of gases the balloon bursts.

5. Why do people perspire a lot on a hot humid day?

Answer: On a hot, humid day, due to the heat our body starts sweating for the cooling mechanism i.e., by evaporation and gets cooling effect. But the air cannot hold any more water on a humid day and therefore the sweat or perspiration is seen.

6. Distinguish between evaporation and boiling. Answer:

7. Why is it advisable to use pressure cooker at higher altitudes?

Answer: At higher altitudes, the atmospheric pressure is low and the water boils very fast and evaporates at faster rate therefore the pressure is required to increase the cooking process and this is done by using pressure cooker which increases the pressure inside the container and cooks food faster.

8. What are fluids?

Answer: The states of matter that can flow due to less intermolecular force of attraction, are liquids and gases and are called as fluids.

9. One kg cotton and one kg sand, which is more denser? Why?

Answer: One kg sand is more denser than 1 kg cotton because density = mass/volume . The volume required by cotton is more than the sand and density and volume are inversely proportional.

10. Why is water liquid at room temperature?

Answer: At room temperature, the molecules of water have some intermolecular force of attraction and the room temperature cannot provide sufficient heat for these molecules to overcome their force of attraction and therefore remain in liquid phase.

11. State the differences between solid, liquid and gas. Answer:

Extra Questions for Class 9 Science Chapter 1 Matter in Our Surroundings 2

12. Cotton in solid but it floats on water. Why?

Answer: Cotton has large number of pores, in which air is trapped. Hence reducing its density and increasing the volume. Therefore cotton floats on water. But when these pores get filled with water it starts sinking.

13. Why arc solids generally denser than liquids and gases?

Answer: Density of a substance is given by a formula= Mass/Volume In case of solids the molecules are tightly packed and hence large mass is concentrated in very small volume. Hence their density is more. But in case of liquids and gases, their molecules have intermolecular space and hence they don’t have large mass concentrated in small volume. So the density of solids is generally more than that of the liquids and gases.

14. On a hot sunny day, why do people sprinkle water on the roof or open ground?

Answer: During hot sunny day, the surface of roof or ground absorbs large amount of heat and remains hot, on sprinkling water on these surfaces, the water absorbs large amount of heat from the surface due to its large latent heat of vaporisation thereby allowing the hot surface to cool.

15. On a hot sunny dug why do we feel pleasant sitting under a tree?

Answer: Tree has lot of leaves which constantly show transpiration. Transpiration is loss of water through small tiny pores of leaves called stomata. When this water comes on the surface of leaf the water evaporates thereby causing cooling effect. Therefore we feel pleasant sitting under the tree on a hot sunny day.

16. The temperature at which liquids change into vapours is very high, for example, water vaporises at 100°C then how is n possible for water to evaporate at room temperature or at are other temperature?

Answer: The molecules of water present on the surface of the exposed area which are in very small fraction, gains the energy from the surrounding. With this higher kinetic energy they are able to break the force of attraction between them and hence get converted into vapour state. This phenomenon of change of a liquid into vapours that takes place at any temperature below its boiling point is called evaporation.

Extra Questions for Class 9 Science Chapter 1 Matter in Our Surroundings 3

17. Name the factors that affect evaporation.

Answer: The rate of evaporation will increase with (1) an increase of surface area, (2) an increase of temperature, (3) a decrease in humidity, (4) an increase in wind speed.

Extra Questions for Class 9 Science Chapter 1 Matter in Our Surroundings 4

18. The melting point of ice is 273.16 K. What does this mean? Explain in detail.

Answer: Ice is solid at 0°C i.e., 273° K. The molecules of ice are tightly packed. These molecules have to overcome the force of attraction with which they are held and hence they gain this heat from the surrounding but the temperature remains the same as their energy is used to overcome the force of attraction between the particles. The particles have their state and starts vibrating freely and a stage reaches when the solid ice melts and is converted to liquid state at the same temperature i.e., 273 K.

19. How is the high compressibility property of gas useful to us?

Answer: The gases have high compressibility. This property is used in the following situation: (1) LPG (liquefied petroleum gas) is a fuel which is made up of petroleum gas. On compressing this petroleum gas it forms liquid. (2) Oxygen cylinders in the hospitals have compressed gas filled in it. (3) CNG (compressed natural gas) is a natural gas, methane, which is compressed and used as a fuel in vehicles and at home.

20. With the help of an example, explain how diffusion of gases in water is essential?

Answer: The gases from the atmosphere diffuse and dissolve in water. Gases like oxygen and carbon dioxide diffuse in water, are essential for the survival of aquatic animals and plants. Animals breathe in this oxygen dissolved in water for their survival and plants can use carbon dioxide dissolved in water for photosynthesis.

Long Answer Type Questions

1. Pressure and temperature determine the state of a substance. Ex-plane this in detail.

Answer: (i) Any matter i.e., solid, liquid or gas when experiences an increase in temperature then they change their state.

Take ice cubes in a beaker or heat them slowly, the temperature increases and the ice melts to form liquid. Heat this liquid further it will become steam.

(ii) On lowering down the temperature of any matter, show change in their state.

Extra Questions for Class 9 Science Chapter 1 Matter in Our Surroundings 6

Take the steam that is coming out of a boiling water and allow it to cool down, it condenses to form water and on further cooling of this water we get ice.

(iii) On applying pressure and reducing temperature we can liquefy gases or change them into solid.

Example: Take carbon-dioxide gas, reduce its temperature and apply lot of pressure on it so that it changes into solid carbon dioxide, called diy ice, which is used as refrigerant for cooling. If the pressure on it is decreased it directly changes into gas.

In LPG cylinders, the petroleum gas is cooled and with lot of pressure changes it into liquid state. While using this LPG, we release the pressure exerted on it and hence it comes out in the form of gas.

2. Explain giving examples the various factors on which rate of evaporation depends.

Answer: The rate of evaporation depends on the following factors: (1) Surface area: If the surface area is increased the rate of evaporation also increases. (a) To dry the clothes we spread them to dry faster. (b) Tea in saucer cools faster than in a cup. (2) Temperature: If the temperature is increased the rate of evaporation also increases. Due to increase in temperature the particles gain more kinetic energy and change their phase from liquid to gaseous. Water will evaporate faster in sun than in shade. (3) Humidity: It is the amount of water vapour present in air. The air can hold definite amount of water vapour, at a given temperature. If the amount of water vapour is high in the air then the rate of evaporation decreases. On hot and humid day, desert coolers are not effective as the air cannot hold any more moisture to get the cooling effect. (4) Wind speed: With the increase in wind speed, the rate of evaporation increases. The particles of water vapour move away with the wind, decreasing the amount of water vapour in the surrounding.

Value-Based Questions

1. Adil parked his bicycle on a sunny day in a parking stand of his school campus. When the school got over Adil saw his burst cycle type. Thereafter he kept less air in his cycle types and did not inflate them fully. (a) Why did the type burst? (b) Why is air compressible? (c) What value of Adil is reflected in the above act?

Answer: (a) The tyre burst because the air inside the tyre got heated and therefore exerted pressure on the walls of the tyre. (b) Air is compressible because it has large intermolecular space. (c) Adil showed the value of intelligence, awareness and self responsibility.

2. Akshay’s friend visited his house in Mumbai and he was surprised to see air conditioners installed in all of his rooms. His friend advised Akshay to use water-coolers and save electricity. On this Akshay told, him that the water-cooler is not at all effective in coastal areas. (a) Why are water-cooler not effective in coastal areas? (b) What are the other two factors on which evaporation of water depends? (c) What value of Akshay’s friend is seen in this act?

Answer: (a) Water coolers are not effective in coastal areas due to high rate of humidity. (b) The other two factors on which evaporation of water depends are temperature and surface area. (c) Akshay’s friend showed the value of concerned citizen, morally responsible and friendly in nature.

3. Sita lived in a village and could, not afford refrigerator in her house. She knew how to keep water cold and preserve all perishable items in her house. She kept wet cloth surrounding the earthen pot to keep water cool, she also kept vegetables fresh by keeping them in wet gunny bag and timely sprinkled water over it. (a) Why did Sita keep wet cloth surrounding the earthen pot? (b) Suggest one more method of keeping the house cool in summer. (c) What value of Sita is reflected in the above case?

Answer: (a) The wet cloth gave the cooling effect to the pot, as the water in the cloth evaporated and evaporation causes cooling effect. (b) By sprinkling some water on the lawn/veranda of the house can keep the house cool. (c) Sita showed the value of responsible behaviour.

4. Shreya commutes in a CNG fitted van to school every day along with many other students. She told the van driver to get the CNG connection certified and timely checked it for any leakage or loose connection of pipes. She told the driver to be more careful during summers. (a) What is CNG? (b) Why should one be more careful with CNG cylinders during summer? (c) What value of Shreya is seen in the above act?

Answer: (a) CNG is Compressed Natural Gas used as fuel. (b) During summers, the CNG connections and cylinder need to be checked because the gas expands due to heat and if there would be any leakage then it would cause fire in the vehicle. (c) Shreya showed the value of concerned citizen and morally responsible behaviour.

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Matter in Our Surrounding Class 9 MCQ Test (Online Available)

Free mcq test, table of content, matter in our surrounding test - 33.

Duration: 10 Mins

Maximum Marks: 10

Read the following instructions carefully.

1. The test contains 10 total questions.

2. Each question has 4 options out of which only one is correct .

3. You have to finish the test in 10 minutes.

4. You will be awarded 1 mark for each correct answer.

5. You can view your Score & Rank after submitting the test.

6. Check detailed Solution with explanation after submitting the test.

7. Rank is calculated on the basis of Marks Scored & Time

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In the Matter in Our Surrounding Class 9 MCQ, students need to make an accurate decision between alternatives. As this process is never considered to be an easy one as the options need to be analysed based on the concepts and topics of the chapter Matter in Our Surrounding. To have a proper analysation process students need to complete the chapter Matter in Our Surrounding in a proper way.

The Matter in Our Surrounding Class 9 MCQ can be helpful for both teachers and students for better learning as well as teaching. With the help of multiple choice questions, teachers don’t need to waste the unnecessary time in searching for questions, they can utilise their precious time in teaching the Matter in Our Surrounding concepts. Students can practise a vast amount of questions so that they can make the preparation process of the chapter Matter in Our Surrounding easier.

Matter in Our Surrounding Class 9 MCQ Online

The Matter in Our Surrounding Class 9 MCQ Online can be accessed quickly as the website provides the questions to practise for all students. The Online Test of the Class 9 MCQ provides prompt feedback to students, accordingly they can improve their grip on the chapter Matter in Our Surrounding so that they can score well.

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Students need to follow some given steps to attempt the Matter in Our Surrounding Class 9 MCQ, steps are discussed below:

Visit the Selfstudys website.
Bring the arrow towards CBSE which can be seen in the navigation bar/ button.
A drop down menu will appear, select MCQ Test from the list.

Matter in Our Surrounding Class 9 MCQ, Matter in Our Surrounding Class 9 MCQ Test, Matter in Our Surrounding MCQ for Class 9, MCQ on Matter in Our Surrounding Class 9, Matter in Our Surrounding Class 9 Online MCQ Test

New page will appear, select Class 9th from the list of classes.

Click Science from the list of subjects.
A pop-up menu will appear, select the chapter Matter in Our Surrounding.
Again a new page will appear and one can easily start the test.

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Mastering in the Matter in Our Surrounding Class 9 MCQ requires systematic and focused approach, below are some steps to master in the objective questions:

Understand the Concepts: Students need to first understand the topics and concepts of the chapter Matter in Our Surrounding, so that they can build a strong foundation and accordingly they can solve multiple choice questions in a better way.
Practise Sample MCQs: Students are advised to practise the sample Matter in Our Surrounding MCQ so that they can get familiarised about the format of questions.
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Recall on a Regular Basis: It is a must for students to recall the topics and concepts of the Matter in Our Surrounding so that they can master multiple choice questions and score well.
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After Completing the Chapter: It is generally recommended for students to start solving the Matter in Our Surrounding MCQ as soon as they complete the chapter accordingly they can reinforce their understanding for the chapter.
Before Final Exams: Students can start solving the MCQ of Matter in Our Surrounding Class 9 before the final exams so that they can identify the gaps in the understanding of the concepts.
During Classroom Study: Students can solve the MCQ of Matter in Our Surrounding during classroom study and can seek help from their teachers to solve confusions.
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Seek Clarification: Students need to seek clarification from the teachers so that they don’t repeat the same set of mistakes while attempting MCQ of Matter in Our Surrounding.
Practise Different Levels of Questions: Students need to practise different levels of multiple choice questions of Matter in Our Surrounding: easy, moderate, advance so that they can understand weak parts and work accordingly.
Note Down the Mistakes: It is a must for students to note down the mistakes made while attempting the Class 9 Matter in Our Surrounding MCQ so that they can easily rectify the mistakes.

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NCERT Exemplar
Science Exemplar Class 9
Matter In Our Surroundings

NCERT Exemplar Class 9 Science Solutions for Chapter 1 - Matter in Our Surroundings

Ncert exemplar solutions class 9 science chapter 1 – free pdf download.

The NCERT Exemplar Solution for Class 9 Science Chapter 1 Matter in Our Surrounding is provided here for the benefit of the students. Studying the NCERT Exemplar Solution will give you in-depth knowledge of the concepts discussed in the chapter. NCERT Exemplar questions are designed in such a way that students can learn all the basic and advanced concepts of the chapter – Matter in Our Surroundings – in a better and easy way.

This Exemplar Solution has answers to questions provided in the NCERT Exemplar Class 9 Science book. It has 10 multiple choice questions, 12 short answer questions and 5 long answer questions of varied difficulty, which will help you to face the exam confidently. To get good marks in the Class 9 examination and to lay a strong foundation for the topics to be studied in future, students are advised to refer to the NCERT Exemplar .

Download the PDF of the NCERT Exemplar for Class 9 Science Chapter 1 – Matter in Our Surroundings

NCERT Exemplar solution class 9 Chapter 1 Part 01

Access Answers to the NCERT Exemplar for Class 9 Science Chapter 1 – Matter in Our Surroundings

Multiple choice questions.

1. Which one of the following sets of phenomena would increase on raising the temperature?

(a) Diffusion, evaporation, compression of gases

(b) Evaporation, compression of gases, solubility

(d) Evaporation, solubility, diffusion, compression of gases

Answer is c) Evaporation, diffusion and expansion of gases

Explanation:

Particles of matter are continuously moving as they possess kinetic energy. When temperature is raised particles of matter intermix with each other which is called diffusion.

Evaporation means conversion of liquid state into vapour state. When we increase temperature molecules move and vibrate so quickly that they escape into the atmosphere in the form of vapours.

Increase in temperature causes the molecules to move faster, which results in expansion of gases.

2. Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions

(a) Low temperature, low pressure

(b) High temperature, low pressure

(d) High temperature, high pressure

Answer is c) Low temperature, high pressure

To compress gas into liquid, low temperature and high pressure are required. Between the particles of gas there is a lot of space. On applying pressure, particles get closer and they start attracting each other to form a liquid. A lot of heat is generated when gas is compresses hence it is necessary to cool it. Cooling lowers the temperature of compressed gas and helps in liquefying it.

3. The property to flow is unique to fluids. Which one of the following statements is correct?

(a) Only gases behave like fluids

(b) Gases and solids behave like fluids

(d) Only liquids are fluids

Answer is c) Gases and liquids behave like fluids

In gases and liquids intermolecular force of attraction between the particles is less and they facilitate flow of these states of matter.

4. During summer, water kept in an earthen pot becomes cool because of the phenomenon of

(a) diffusion

(b) transpiration

(d) evaporation

Answer is d) evaporation

Evaporation of water through pores of earthen pot reduces temperature of immediate surroundings. This makes the water cool after some time.

Movement of water through plants and evaporation through its aerial parts is called transpiration.

Diffusion is the movement of a substance from an area of higher concentration to an area of lower concentration

If molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one, it is called osmosis.

5. A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents a correct arrangement?

(a) Water, air, wind

(b) Air, sugar, oil

(d) Salt, juice, air

Answer is c) Oxygen, water, sugar

The intermolecular force of attraction is less in gases than liquid and solid. Solids have higher intermolecular attraction compared to liquid. In the answer, oxygen is a gas which has lesser intermolecular attraction than water-a liquid and sugar- a crystalline solid.

6. On converting 25°C, 38°C and 66°C to kelvin scale, the correct sequence of temperature will be

(a) 298 K, 311 K and 339 K

(b) 298 K, 300 K and 338 K

(d) 298 K, 310 K and 338 K

Answer is a) 298 K, 311 K and 339 K

Add 273 to respective temperature to get the temperature in kelvin. 25°-298K, 38°-311K, 66°-339K

7. Choose the correct statement of the following

(a) Conversion of solid into vapours without passing through the liquid state is called sublimation.

(b) Conversion of vapours into solid without passing through the liquid state is called vaporisation.

(d) Conversion of solid into liquid is called sublimation.

Answer is a) Conversion of solid into vapours without passing through the liquid state is called sublimation.

Sublimation is a process in which a solid is converted into vapours without passing through a liquid state.
Vaporisation is a phase transition from liquid to vapours.
Conversion of liquid to solid at substance’s freezing temperature is called as freezing.

8. The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C respectively. Which one of the following correctly represents their boiling points in kelvin scale?

(a) 306 K, 329 K, 391 K

(b) 308 K, 329 K, 392 K

(d) 329 K, 392 K, 308 K

Answer is c) 308 K, 329 K, 391 K

The temperature in Celsius can be converted into temperature in kelvin by adding 273 to the Celsius value. Boiling points of diethyl ether, acetone and n-butyl alcohol are 308 K, 329 K, and 391 K, respectively.

9. Which condition out of the following will increase the evaporation of water?

(a) Increase in temperature of water

(b) Decrease in temperature of water

(d) Adding common salt to water

Answer is a) Increase in temperature of water

Increase in temperature of water increases the kinetic energy of the water which will make more particles to attain enough energy to convert into the vapour state. This is how an increase in temperature favours evaporation.

On the other hand, the exposed surface is also responsible for the evaporation. Higher the exposed surface, higher will be the evaporation.

When common salt is added to water then the surface is occupied by the solvent as well as non-volatile solute particles.

This makes the escaping tendency of solvent particles decrease and thus the evaporation of water decreases. Hence options (b), (c) and (d) will decrease the evaporation of water.

10. In which of the following conditions, the distance between the molecules of hydrogen gas would increase?

(i) Increasing pressure on hydrogen contained in a closed container

(ii) Some hydrogen gas leaking out of the container

(iii) Increasing the volume of the container of hydrogen gas

(iv) Adding more hydrogen gas to the container without increasing the volume of the container

(a) (i) and (iii)

(b) (i) and (iv)

(d) (ii) and (iv)

Answer is c) ii and iii

Explanation

To increase the intermolecular interaction either volume of Hydrogen gas should be reduced or container volume should be increase.
By increasing the pressure or by adding Hydrogen without increasing container volume inter-molecular interaction would decrease.
Water under study was found to boil at 102°C at normal temperature and pressure.

Short Answer Questions

11. A sample of water under study was found to boil at 102°C at normal temperature and pressure. Is the water pure? Will this water freeze at 0°C? Comment.

The boiling point of pure water is 100 °C and the melting point is 0°C at 1 atmospheric pressure. Here the water boils at 102 °C hence it is not pure water and freezes at a temperature below 0°C.

12. A student heats a beaker containing ice and water. He measures the temperature of the content of the beaker as a function of time. Which of the following (Fig. 1.1) would correctly represent the result? Justify your choice.

Answer is d) because at the start of the experiment temperature of the mixture would be zero as water and ice will be in equilibrium. When students start heating initially latent heat will be utilised to melt the ice. Hence the temperature did not increase for a certain amount of time. When students heat the mixture further the temperature of the water increases gradually.

13. Fill in the blanks:

(a) Evaporation of a liquid at room temperature leads to a——— effect.

(b) At room temperature the forces of attraction between the particles of solid substances are———than those which exist in the gaseous state.

(d) ——— is the change of solid state directly to vapour state without going through the ———state.

(e) The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called———.

Liquid, gaseous
Sublimation, liquid
Evaporation

14. Match the physical quantities given in column A to their S I units given in column B:

(a) — (iii) The SI unit of pressure is the pascal (denoted by P).

(b) — (iv) The SI unit of temperature is -Kelvin (denoted by K).

(d) — (ii) The SI unit of mass is the kilogram (kg).

(e) — (i) The SI unit of volume is m 3 .

15. The non-SI and SI units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity:

(a) — (iv) Degree Celsius and kelvin are the units of temperature.

(b) — (iii) Centimetre and metre are the units of length.

(d) — (ii) Bar and pascal are the units of pressure.

(e) – (i) Milligram and kilogram are the units of mass.

16. ‘Osmosis is a special kind of diffusion’. Comment.

Diffusion in liquids and gases is the movement of particles from high concentration to low concentration. Osmosis is the movement of particles from the low concentration to high concentration through a semi-permeable membrane. This movement happens due to diffusion. Hence, osmosis is a special kind of diffusion.

17. Classify the following into osmosis/diffusion

(a) Swelling up of a raisin on keeping in water.

(b) Spreading of virus on sneezing.

(d) Shrinking of grapes kept in thick sugar syrup.

(e) Preserving pickles in salt.

(f) Spreading of smell of cake being baked throughout the house.

(g) Aquatic animals using oxygen dissolved in water during respiration

b) Diffusion

f) Diffusion

a) Swelling up of a raisin on keeping in water is osmosis because the concentration of solutes is more outside. Hence, water moves water from higher to lower concentrations through a semipermeable membrane, causing the raisin to swell.

b) Spreading the virus through sneezing is diffusion because the virus enters the air in tiny droplets. They remain suspended for a long time and move here and there in the air from higher to lower concentrations.

c) Earthworms die on coming in contact with common salt is osmosis because of variations in the concentration of water and solute. When salt is sprinkled on them, their skin gets dried, due to which their body shrinks, and they die.

d) The shrinking of grapes in thick sugar syrup is Osmosis because water will move down from higher to lower concentrations via a semipermeable membrane.

e) The Preserving of pickles in salt is Osmosis because salt helps to remove water from the cells and helps to preserve pickles.

f) The spreading of the smell of cake being baked throughout the house is Diffusion because the particles of cake move from a region of higher concentration to lower concentration through diffusion hence, producing the smell.

g) Aquatic animals using oxygen dissolved in water during respiration is osmosis because fish absorb oxygen from water (high concentration) through gills and skin (semipermeable membrane) to the lower concentration.

18. Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations.

Water as steam has more latent heat as compared to water as solid and liquid. Hence it causes severe burns while water as ice causes a cooling effect.

19. Alka was making tea in a kettle. Suddenly she felt intense heat from the puff of steam gushing out of the spout of the kettle. She wondered whether the temperature of the steam was higher than that of the water boiling in the kettle. Comment.

Steam and the temperature of water boiling in the kettle is the same. But the particles of steam have more energy in the form of latent heat of vaporisation than the particles of water. This energy is released when the steam condenses to water. Therefore, steam is hotter than boiling water.

20. A glass tumbler containing hot water is kept in the freezer compartment of a refrigerator (temperature < 0°C). If you could measure the temperature of the content of the tumbler, which of the following graphs (Fig.1.2) would correctly represent the change in its temperature as a function of time.

Graph (a) is the right answer because water will cool initially until its temperature reaches 0 °C. After reaching the freezing point (0 °C) temperature will remain constant until the water becomes ice. After that point temperature would decrease again.

21. Look at Fig. 1.3 and suggest in which of the vessels A,B, C or D the rate of evaporation will be the highest? Explain.

Answer is C because evaporation increases with an increase in the surface area. With an increase in wind speed particles of water vapour will move away hence the rate of evaporation will be the highest.

(a) Conversion of solid to vapour is called sublimation. Name the term used to denote the conversion of vapour to solid.

(b) Conversion of solid state to liquid state is called fusion; what is meant by latent heat of fusion?

used to denote the conversion of vapour to solid.

a) A deposition is the term used to denote the conversion of vapour to solid.

b) The amount of heat energy released or absorbed when a solid change to liquid at atmospheric pressure at its melting point is known as the latent heat of fusion.

Long Answer Questions

23. You are provided with a mixture of naphthalene and ammonium chloride by your teacher. Suggest an activity to separate them with well-labelled diagram.

Naphthalene is a non-polar compound which will not dissolve in water. Similarly, ammonium chloride is a polar compound which is soluble in water. Naphthalene is volatile in room temperature whereas ammonium chloride is volatile at high temperature.

The mixture of Naphthalene and ammonium chloride can be separated by decantation of aqueous mixture. Naphthalene remains undissolved in water and can be taken out in a funnel. The filtrate of ammonium chloride can be evaporated to obtain dry ammonium chloride.

24. It is a hot summer day, Priyanshi and Ali are wearing cotton and nylon clothes respectively. Who do you think would be more comfortable and why?

Hot summer leads to a lot of sweating. Cotton absorbs moisture whereas Nylon will not absorb the moisture as efficiently as cotton does. Hence cotton absorbs the sweat faster that Nylon does. Evaporation of moisture from the cotton cloth will give a cool feeling, especially when the wind blows. Hence, it can be concluded that Priyanshi will be more comfortable in summer days.

25. You want to wear your favourite shirt to a party, but the problem is that it is still wet after a wash. What steps would you take to dry it faster?

Drying of clothes is due to the process of evaporation hence the following steps should be taken to dry the shirt faster.

Dry the shirt under a fan with high speed. With an increase in the speed of fan, water vapours will move away. This decreases water vapour in the surroundings which will increase the evaporation and the shirt gets dried faster.
Spread the shirt on a hanger which will increase surface area. Increase in the surface area makes the shirt dry quickly.
Dry the shirt in sunlight. Because of high-temperature water evaporates faster. Thus the shirt gets dried easily.
Iron the shirt. Heat increases the speed of vaporization and evaporation. This dries the shirt faster.

26. Comment on the following statements:

(a) Evaporation produces cooling.

(b) Rate of evaporation of an aqueous solution decreases with increase in humidity.

a) When a liquid evaporates it takes latent heat from the object it touches. This will make the object cooler. Hence evaporation causes cooling.

b) When there is an increase in the humidity water vapour in the atmosphere will be more. Hence the atmosphere will not take water vapours easily which decreases the process of evaporation.

c) Sponge is a solid because it has definite shape and volume which does not change until you press it. It has minute pores in which air is filled. When you press it, air passes out through pores this makes it a compressible solid.

27. Why does the temperature of a substance remain constant during its melting point or boiling point?

The temperature of a substance remains constant during melting and boiling points till the completion of melting and boiling because of the latent heat of fusion used by the substances. Latent heat of fusion helps to overcome the force of attraction between particles of solid to change into a liquid when they melt. Hence temperature remains constant.

In the same way during the formation of vapours, latent heat helps solid substance to convert into a gaseous state. Hence temperature of a substance remains constant at boiling point.

Important Concepts of the NCERT Exemplar Class 9 Science Matter in Our Surroundings

Physical nature of matter
The matter is made up of particles
How small are these particles of matter?
Particles of matter are continuously moving
Characteristics of particles of matter
Particles of matter have space between them
Particles of matter attract each other
States of matter
The liquid state
The solid state
The gaseous state
Can matter change its state?
Effect of change of temperature
Effect of change of pressure
Factors affecting evaporation
How does evaporation cause cooling?

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NCERT Solutions Class 9 Science Chapter 1 - Free PDF Download. NCERT Solutions for Class 9 Science (Chemistry) Chapter 1 Matter in Our Surroundings is an important study material from the standpoint of your CBSE Class 9 Science examination. Detailed NCERT Solutions for Class 9 Chemistry provided here will help you understand the fundamental concepts taught in the chapter.
CBSE Class 9 Science Matter in Our Surroundings Important ...
The questions that are included in chapter 1 science class 9 important questions are most likely to come in the exams. Thus, preparing the students better and efficient. Students can download the pdf of class 9 chapter 1 science important questions from the Vedantu site. This pdf is available for free.
Extra Questions for Class 9 Science Chapter 1 Matter in ...
9. Define latent heat of fusion. Answer: Latent heat of fusion is the amount of heat energy required to change 1 kg of solid into liquid at its melting point. 10. Define sublimation. Answer: Sublimation is the change of gaseous state directly to solid state without going through liquid state and vice-versa. 11.
Matter in Our Surrounding Class 9 MCQ Test (Online Available)
Students need to follow some given steps to attempt the Matter in Our Surrounding Class 9 MCQ, steps are discussed below: Visit the Selfstudys website. Bring the arrow towards CBSE which can be seen in the navigation bar/ button. A drop down menu will appear, select MCQ Test from the list. New page will appear, select Class 9th from the list of ...
CBSE Class 9 Case Study Questions
Maths Case-Study Qs. Maths Case-Study Qs. VIEW ALL. TopperLearning offers an online platform to access case studies for CBSE Class 9 students. Explore your analytical and problem-solving skills by solving case studies with our expert guidance. Get started today!
Matter In Our Surroundings Class 9 Notes
CBSE Class 9 Science Notes Chapter 1 Matter In Our Surroundings. Download PDF. Anything that has mass and takes up space is referred to as matter. hydrogen and oxygen, sugar and sand, air and water, etc. Small, minuscule particles make up matter. Due to the space between them, matter particles are attracted to one another.
Category: Case Study Questions for Class 9 Science
July 30, 2022 July 30, 2022 Physics Gurukul Leave a Comment on Case Study Questions for Class 9 Science Chapter 14 Natural Resources. Case Study Questions for Class 9 Science Chapter 14 Natural Resources. ... Assertion and Reason Questions for Class 9 Science Chapter 1 Matter in Our Surroundings;
PDF Chapter1 MMMATTER IN OUR SURROUNDINGS
W e can see that matter around us exists in three different states- solid, liquid and gas. These states of matter arise due to the variation in the characteristics of the particles of matter. Now, let us study about the pr operties of these three states of matter in detail. 1.3.1 THE SOLID STATE.
NCERT Exemplar Class 9 Science Solutions for Chapter 1
The NCERT Exemplar Solution for Class 9 Science Chapter 1 Matter in Our Surrounding is provided here for the benefit of the students. Studying the NCERT Exemplar Solution will give you in-depth knowledge of the concepts discussed in the chapter. NCERT Exemplar questions are designed in such a way that students can learn all the basic and ...
Case Study and Passage Based Questions for Class 9 Science Chapter 9
Case Study/Passage Based Questions: Question 1: Read the following and answer any four questions from (i) to (v) given below : In the figure below the card is flicked with a push. It was observed that the card moves ahead while coin falls in glass. (i) Give reason for the above observation.(a) The coin possesses … Continue reading Case Study and Passage Based Questions for Class 9 Science ...

Class 9 Science Case Study Questions Chapter 1 Matter in our Surroundings

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Chapter 1 Class 9 - Matter In Our Surroundings

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NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings

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Class 9 Science Chapter 1 Extra Practice Questions

When sugar is dissolved in water, there is hardly an increase in volume. Which characteristic of matter is illustrated by this observation?

Define gaseous state of a substance.

How does pressure help in the liquefication of a gas?

Solids are generally very heavy while gases are light. Explain.

Important Questions on 9th Science Chapter 1

We can get the smell of perfume sitting several meters away. Why?

Water at room temperature is a liquid. Give reason.

An iron almirah is a solid at room temperature. Give reason.

Why is ice at 273 K more effective in cooling than water at the same temperature?

What produces more severe burns, boiling water or steam?

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NCERT Solutions for Class 9 Science Chapter 1 Matter in Our Surroundings

Chapter 1 Matter in Our Surroundings NCERT Solutions for Class 9 Science

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Unit I: Matter-Nature and Behaviour

Unit II: Organization in the Living World

Unit III: Motio n, Force, and Work

Unit IV: Food Production

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