case study based questions on matter in our surroundings

Case Study Questions Class 9 Science Matter in our Surroundings

Case study questions class 9 science chapter 1 matter in our surroundings, cbse case study questions class 9 science – matter in our surroundings, case study 1:, case study 2:, case study 3:.

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

Case Study 4:

Case study 5:.

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

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

Last Updated on May 12, 2024 by XAM CONTENT

Hello students, we are providing case study questions for class 9 science. Case study questions are the new question format that is introduced in CBSE board. The resources for case study questions are very less. So, to help students we have created chapterwise case study questions for class 9 science. In this article, you will find case study questions for cbse class 9 science chapter 1 Matter in Our Surroundings.

Table of Contents

Case Study Questions on Matter in Our Surroundings

Question 1:

The word ‘matter’ refers to everything in the universe that has mass and takes up space. States of matter are generally described on the basis of qualities that can be seen or felt. Three states of matter can be found in daily life: solid, liquid and gas.

Matter that feels hard and maintains a fixed shape is called a solid, matter that feels wet and maintains its volume but not its shape is called a liquid. Matter that can change both shape and volume is called a gas.

Read the given passage carefully and give the answer of the following questions:

Q 1. In which form, do the water molecules have less kinetic energy?

d. All of them have equal kinetic energy

Q2. Which of the following describes the liquid phase?

a. It has a definite shape and a definite volume.

b. It has a definite shape but not definite volume.

c. It has a definite volume but not a definite shape.

d. It has neither a definite shape nor a definite volume.

Q 3. Which one of the following statements is wrong for gases?

a. Gases do not have a definite shape and volume.

b. Volume of the gas is equal to the volume of the container confining the gas.

c. Confined gas exerts uniform pressure on the walls of container in all directions.

d. Mass of the gas cannot be determined by weighing a container in which it is enclosed.

Q 4. ‘Gases are easily compressed but liquids cannot be compressed.’ What can be inferred from this statement?

a. The forces of attraction between gas particles are stronger than that between liquid particles.

b. The gas particles are spaced further apart than liquid particles. c. The gas particles have less energy than liquid particles.

d. The gas particles move more rapidly than liquid particles.

Q 5. As the solid melts to form liquid:

a. interparticle forces of attraction decrease

b. the kinetic energy of particles increases

c. compressibility increases

d. All of the above

Ice (solid) has less kinetic energy as compared to water (liquid) and steam (gas).

2. (c) It has a definite volume but not a definite shape.

3. (d) Mass of the gas cannot be determined by weighing a container in which it is enclosed.

The mass of a gas can be determined by weighing the empty container first, then filling it with gas and again weighing the container filled with gas. The difference of two readings gives the mass of gas.

4. (b) The gas particles are spaced further apart than liquid particles.

The large space between the particles of gas allow the gas to be easily compressed when pressure is applied.

5. (d) All of the above

When a solid is heated, the interparticle force decreases and kinetic energy of the particles increases. Compressibility of liquids is slightly more than solids, hence increase

Topics from which case study questions may be asked

• Matter and its physical properties
• Characteristics pf particles of mattter
• States of Matter
• Scales of Measuring Temperature
• Evaporation
• Factors affecting Rate of Evaporation

This chapter deals with the basic understanding of acids, bases, and salts, including their properties, reactions, pH scale, indicators, and practical applications.

Frequently Asked Questions (FAQs) on Matter in Our Surroundings Case Study Questions

Q1: what are case study questions for cbse examinations.

A1: Case study questions in CBSE examinations typically involve scenarios or real-life examples, requiring students to apply their understanding of concepts to solve problems or analyze situations.

Q2: Why are case study questions important for understanding class 9 science chapters?

A2: Case study questions provide a practical context for students to apply theoretical knowledge to real-world situations, fostering deeper understanding and critical thinking skills.

Q3: How should students approach answering case study questions for CBSE?

A3: Students should carefully read the case study, identify the key issues or problems presented, analyze the information provided, apply relevant concepts and principles of chemical reactions and equations, and formulate well-supported solutions or responses.

Q4: Are there any resources available online for students to practice case study questions on class 9 science chapters for CBSE exams?

A4: Yes, several educational websites offer case study questions for CBSE students preparing for science examinations. We also offer a collection of case study questions for all classes and subject on our website. Visit our website to access these questions and enhance your learning experience. If you need more case study questions for your preparation, then you visit Physics Gurukul website.

Q5: How can students effectively prepare for case study questions on chemical reactions and equations for CBSE exams?

A5: Effective preparation strategies include regular revision of concepts, solving practice questions, analyzing case studies from previous exams, seeking clarification on doubts, and consulting with teachers or peers for guidance and support.

Q6: How can teachers incorporate case study questions on matter in our surroundings class 9 science into classroom teaching?

A6: Teachers can integrate case studies into lesson plans, group discussions, or interactive activities to engage students in active learning, promote problem-solving skills, and facilitate a deeper understanding of acids, bases and salts.

Q7: What is matter made up of?

A7: Matter is made up of particles.

Q8: What happens when salt is added to water?

A8: When we add salt in water, the particles of salt get into the spaces between particles of water. We say that salt has been dissolved into water.

Q9: What happens when we light the incense stick in one corner of a room?

A9: The smell of the incense stick spreads throughout the room due to diffusion

Q10: Which of the following substances diffuses faster in a glass of water: a drop of honey or blue ink?

A10: Blue ink, because of the high kinetic energy of the particles of the given matter. Honey is viscous, and has low kinetic energy.

Q11: Why does diffusion becomes faster on heating?

A11: On heating, the kinetic energy of the particles increases and the particles move faster. This speeds up the intermixing of particles

Q12: Why do the gases exert more pressure on the walls of the container than the solids?

A12: In gases, the particles move randomly at high speed and they collide with each other and with walls of the container. Due to this collision with walls of the container, the gases exert more pressure than solids.

Q13: What happens to the particles of the solid during sublimation?

A13: Sublimation is a process in which the solid changes directly to gas either by decreasing pressure or increasing temperature. A decrease in pressure increases the space between the particles and an increase in temperature increase the kinetic energy of the particles.

Q14: List all the factors which affects the rate of evaporation.

A14: The factors affecting the rate of evaporation are: (a) an increase in surface area (b) an increase in temperature (c) an increase in wind speed (d) a decrease in humidity

Class 9 Science Chapter 1 Case Based Questions - Matter in Our Surroundings

(I) Read the given passage and answer the questions that follows based on the passage and related studied concepts. Matter is anything that occupies space and has mass. Matter is classified into solid, liquid and gas. In solid state particles are closely packed and have very strong force of attraction, particles can only vibrate and rotate around fixed positions. In liquid state, particles are less closely packed and have strong force of attraction but less than solids, particles can move throughout the liquid. In Gaseous state, particles are far apart with weak force of attraction and are in state of constant random motion. Gases can be easily compressed where as solids and liquids are incompressible. Q1: An inflated balloon is placed in refrigerator, what will happen? (a)  Balloon will shrink and particles will move faster and become closer. (b) Balloon will expand and particles will move faster and become far apart. (c)  Balloon will shrink, particles will move slower and become close together. (d) Balloon will expand, particles will move slower and come closer therefore, volume of balloon will decrease. Ans: (c)  Kinetic energy will decrease, so particles will move slower, become closer and volume of balloon will decrease.

Q2: When solid changes into vapours, the process is called. (a) Evaporation (b) Boiling (c)  Sublimation (d)  Vapourisation Ans:  (c)

Q3: A substance melts at 5°C and boils at 150°C. What will be its physical state at room temperature?  Ans:  Liquid

Q4: Why do we feel more cold after taking bath with hot water? Ans:  It is because hot water evaporates faster than cold water and cause more cooling.

Q2: What does AB represent? Ans:  It represents a mixture of liquid and vapours at boiling point of liquid.

Q3: Why does temperature remain constant at boiling point? Ans: It is because heat of vaporization is used to overcome force of attraction between particles of liquid.

Q4: What does BC represent? Ans:  It represents vapour state and particles absorb heat and become more energetic. The tempera-ture of gas will rise.

(III) Read the following information and answer the questions based on information and related studied concepts Substance – 1. is brittle. Substance – 2. melts at 5°C and boils at 150°C. Substance – 3. has high melting point of 800°C. Substance – 4. has melting point –169°C and boiling point –104°C.

Q1:  What is physical state of substance – 4 at –150°C and –100°C? Ans:  Substance 4 is liquid at –150°C and gas at –100°C.

Q2: What is physical state of substance – 1 and 3 at room temperature? Ans:  Substance 1 and 3 are solids at room tempera-ture.

Q3: What is physical state of substance – 2 at 100°? Ans:  It will be in liquid state.

Q4: Out of substances – 1, 2, 3, 4 which one has strongest force of attraction? Ans:  Substance 3 has strongest forces of attraction.

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Case Study Questions of Chapter 1 Matter in our Surroundings PDF Download

Case study Questions on 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 case study-based questions for Class 9 Science Chapter 1 Matter in our Surroundings

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

Question 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 very low density hence is light. Gas can flow easily and hence is called fluid.

i.) Which of the following state of matter takes 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

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Class 9th Science - Matter in Our Surroundings Case Study Questions and Answers 2022 - 2023

Class 9th Science - Matter in Our Surroundings Case Study Questions and Answers 2022 - 2023 Study Materials Sep-09 , 2022

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Matter in our surroundings case study questions with answer key.

Final Semester - June 2015

 Case Study 

(ii) Name the brown gas which could be in jar A.

(iii) Which is the colourless gas most likely to be present in jar B ?

(iv) When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapours of bromine from the lower jar go upward into the jar containing air. In this experiment : (a) air is heavier than bromine (b) both air and bromine have the same density (c) bromine is heavier than air (d) bromine cannot be heavier than air because it is going upwards against gravity (v) When a gas jar containing colourless air is kept upside down over a gas jar full of brown-coloured bromine vapour, then after some time, the brown colour of bromine vapour spreads into the upper gas jar making both the gas jars appear brown in colour. Which of the following conclusion obtained from these observations is incorrect ? (a) bromine vapour is made of tiny particles which are moving (b) air is made up of tiny particles which are moving (c) the particles of bromine are moving but those of air are not moving (d) even though bromine vapour is heavier than air, it can move up against gravity

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Class 9 Science Case Study Questions

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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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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:

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.

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.

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.

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.

Class 9 Science Case Study Questions Chapter 2 Is Matter Around Us Pure

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Case study Questions in Class 9 Science Chapter 2 are very important to solve for your exam. Class 9 Science Chapter 2 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 2 Is Matter Around Us Pure?

Join our Telegram Channel, there you will get various e-books for CBSE 2024 Boards exams for Class 9th, 10th, 11th, and 12th.

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.

Is Matter Around Us Pure? Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 9 Science  Chapter 2 Is Matter Around Us Pure?

Case Study/Passage-Based Questions

Case Study 1: Akshita wants to separate the mixture of dyes constituting a sample of ink. She marked a line by the ink on the filter paper and placed the filter paper in a glass containing water as shown in the figure. The filter paper was removed when the water moved near the top of the filter paper.

(i) Identify the technique used by the Akshita. (a) Sedimentation (b) Filtration (c) Chromatography (d) Distillation

Answer: (c) Chromatography.

(ii) What would you expect to see, if the ink contains three different coloured components? (a) We will not see any band on the filter paper. (b) We would see three bands on the filter paper at various lengths. (c) We would see infinite bands on the filter paper. (d) We would see the single band on the filter paper.

Answer: (b) The components of the ink will travel with water and we would see three bands on the filter paper at various lengths.

(iii) An application where you can use this technique is: (a) To separate salt from sand (b) To separate the wheat from the husk (c) To separate oil from water (d) To separate drugs from the blood.

Answer: (d) To separate drugs from blood.

(iv) The above process is used for the separation of : (a) insoluble substances (b) single solute that dissolves in the soluble solvent. (c) solutes that dissolve in the same solvent. (d) solutes that dissolve in the different solvents.

Answer: (c) For the separation of those solutes that dissolve in the same solvent.

(v) What is chromatography? (a) It is an agricultural method to separate grains (b) A method to separate magnetic impurities from non-magnetic impurities

(c) The process of separating the suspended particles of an insoluble substance (d) Method of separating and identifying various components in a mixture, which are present in small trace quantities.

Answer: (d) Method of separating and identifying various components in a mixture, which are present in small trace quantities.

Case Study 2: A homogeneous mixture of two or more substances is called a true solution. it consists of solute and solvent. The particle size of the true solution is less than 1 nanometer. A suspension is a heterogeneous mixture in which the solute particle does not dissolve but remains suspended throughout the bulk of the medium. A colloid is a mixture that is actually heterogeneous but appears to be homogeneous as the particles are uniformly spread throughout the solution.

(i) which one of the following is most stable? 

A)True solution

B)Suspensions

D) both A and B

Answer: A)True solution

ii) which type of mixture can be separated by filtration? 

D)All of these

Answer: B)Suspensions

iii) which statement is incorrect about the Tyndall effect. *

A)True solution shows Tyndall effect

B)Suspensions show the Tyndall effect

C)Colloid show Tyndall effect

D)Both B and C show the Tyndall effect

Answer: A)True solution shows Tyndall effect

iv) Which is the correct order of stability of solution *

A) True < Colloid<Suspension

B)Colloid<Suspension<True

C)Colloid<True<Suspension

D)Suspension<Colloid<True

Answer: D)Suspension

Case Study 3:

Matter can be classified into two categories: pure substances and mixtures. Pure substances are made up of a single type of particle and cannot be separated into other substances by physical methods. They have definite and constant properties. On the other hand, mixtures are made up of two or more substances that are physically combined and can be separated into their individual components. Mixtures can be further classified into homogeneous and heterogeneous mixtures. Homogeneous mixtures are uniform in composition, meaning the components are evenly distributed throughout the mixture. Heterogeneous mixtures, on the other hand, have non-uniform composition with visible different parts. It is important to understand the nature of matter around us and differentiate between pure substances and mixtures to comprehend their properties and behavior.

What is the main characteristic of a pure substance? a) Made up of two or more substances b) Cannot be separated into other substances c) Has non-uniform composition d) Components are evenly distributed Answer: b) Cannot be separated into other substances

Which of the following is an example of a pure substance? a) Air b) Saltwater c) Gold d) Soil Answer: c) Gold

How are mixtures different from pure substances? a) Mixtures have definite and constant properties b) Mixtures are made up of a single type of particle c) Mixtures cannot be separated into other substances d) Mixtures are physically combined and can be separated Answer: d) Mixtures are physically combined and can be separated

Which type of mixture has a non-uniform composition? a) Homogeneous mixture b) Heterogeneous mixture Answer: b) Heterogeneous mixture

What is the primary reason for understanding the nature of matter around us? a) To separate mixtures into pure substances b) To comprehend the properties and behavior of matter c) To classify mixtures into homogeneous and heterogeneous d) To identify the components in pure substances Answer: b) To comprehend the properties and behavior of matter

Hope the information shed above regarding Case Study and Passage Based Questions for Class 9 Science Chapter 2 Is Matter Around Us Pure? with Answers Pdf free download has been useful to an extent. If you have any other queries about CBSE Class 9 Science Is Matter Around Us Pure? Case Study and Passage-Based Questions with Answers, feel free to comment below so that we can revert back to us at the earliest possible By Team Study Rate

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Important Questions for CBSE Class 9 Science Matter in Our Surroundings 2024-25

• Class 9 Important Question
• Chapter 1: Matter In Our Surroundings

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 2024-25 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. 

(c) A temperature of 100⁰C? 

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 

(c) remain same 

(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 

(c) gases 

(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 

(c) 27 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 

(c) sublimation and condensation 

(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 

(c) solid, gas, and liquid 

(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. 

3.  

(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.

(c) A wooden table should be called a solid. 

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. 

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 2024-25

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

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

• Last modified on: 3 years ago
• Reading Time: 29 Minutes

Very Short Answer Type Questions (One Mark Each)

Q.1. Degree Celsius and Kelvin are two units of measuring temperature. Which of these are SI and non-SI units ?

Q.2. What is the SI unit of pressure ?

Q.3. Define matter.

Q.4. Which of the following is/are a matter : Apple, biscuit, coffee, toffee, soil, soyabean oil, cold drink, ice-cream, tooth paste, scent, dust, wind and shoe?

Q.5. Name a simplest form of matter.

Q.6. What is common about all things which we see around us ?

Q.7. Name different states of water.

Q.8. What is the common unit of measuring volume ?

Q.9. What is mL ?

Q.10. Is it correct to say that matter is particulate in nature ?

Q.11. Kitchen salt (NaCl) when added to water, gets evenly distributed in it. Which characteristic of particles of matter is exhibited by this?

Q.12. Which has more force of attraction between the particles ? Iron nail or rubber band.

Q.13. Which will have more density – a solid or a liquid ? Explain.

Q.14. Which are more energetic solids or liquids ?

Q.15. In which physical state, water exists at (a) 100 °C (b) 0 °C ?

Q.16. Is freezing point of water and melting point of ice the same ? Say yes or no.

Q.17. What is the freezing point of water ?

Q.18. What is the melting point of ice ?

Q.19. The boiling point of water is 100 °C. Express this in SI units (Kelvin scale).

Q.20. The boiling point of alcohol is 78 °C. What is this temperature on Kelvin scale ?

Q.21. The Kelvin scale temperature is 0 K. What is the corresponding Celsius scale temperature ?

Q.22. Why does a gas exert pressure ?

Q.23. How will you demonstrate that water vapour is present in air ?

Q.24. Why gases are compressive but not liquids ?

Q.25. Which produces more severe burns : boiling water or steam at 100 °C ?

Q.26. Arrange the following substances in increasing order of force of attraction between the particles : (a) Milk (6) Salt and (c) Oxygen

Q.27. A substance has no mass. Can we consider it as matter? [CBSE 2012]

Q.28. If the food is being cooked in the kitchen, name the process which brings smell to us?

Q.29. Name the phenomenon by which particles of two or more substances intermix on their own.

Q.30. A diver is able to cut through water in a swimming pool. What property of matter does this observation show ?

Q.31. Sugar and salt when kept in different jars take the shape of the jar. Are they solid ? Justify your answer.

Q.32. What determines the state of a substance ?

Q.33. Name two gases which are supplied in compressed form in homes and hospitals.

Q.34. State one difference between gas and vapour.

Q.35. After morning exercise, you feel cold. Explain.

Q.36. Give the graphical representation of the temperature and time when a student heats a mixture of ice and water in a beaker.

Short Answer Type Questions (Two Marks Each)

Q.1. (a) Write the full forms of (1) LPG (1) CNG. (b) Give the main use of CNG.

Q.2. Define diffusion. Is it faster in winter or summer season ?

Q.3. By placing finger in the running stream of water, you are not able to break the stream of water. What do you conclude from this ?

Q.4. In which of the following substances, you expect strongest and in which the weakest molecular forces : (a) Sodium chloride (b) Carbon dioxide ?

Q.5. What is the common name of solid carbon dioxide ? What is its use?

Q.6. Name the factors affecting evaporation.

Q.7. Liquids like ether and acetone are kept in cool places. Why?

Q.8. Which will evaporate faster : alcohol or ether?

Q.9. Boiling point of water on hill station like Simla is lower than in Delhi. Why?

Long Answer Type Questions (Five Marks Each)

Q.1. Wet clothes dry up similarly when we spill water on the floor it dries up after sometime. In both the cases change of state from liquid to vapour takes place without reaching the boiling point. (i) What is this phenomenon called ? (ii) Explain how the change occurs at temperatures lower than the boiling (ii) Mention three factors which determine the rate at which the change of state from water to vapours occurs at room temperature.

Q.2. Explain the following : (i) Fusion (ii) Kelvin (iii) Latent heat (iv) Latent heat of fusion and vaporisation (v) Atmospheric pressure.

Q.3. (i) Why do solids have fixed shape and fixed volume ? (ii) Why is air dense at the sea level ? (iii) On melting of ice, there is decrease in volume instead of increase. Why? (iv) What is the binding force between molecules if a substance is a gas under ordinary conditions of temperature and pressure ? (v) Why are average kinetic energies of hydrogen, carbon dioxide and ethane the same at the same temperature ?

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• Chemistry Concept Questions and Answers

Matter in our Surrounding Questions

Matter is anything that occupies space and has some mass. All biotic and abiotic components of the ecosystem are termed as matter. All biotic and abiotic components are matter because they have mass and occupy space.

Matter in our Surrounding Chemistry Questions with Solutions

Q1. Which of the following phenomena would increase on raising the temperature?

• Evaporation, Diffusion and Expansion of Gas
• Solubility, Evaporation, Diffusion and Expansion of Gas
• Evaporation, Diffusion and Compression of Gas
• Diffusion, Compression of Gas and Expansion of Gas

Answer: (a), Evaporation, Diffusion and Expansion of Gas increases with temperature rise.

Q2. What is the physical state of water at 100 ∘ C.

• Both a and b
• None of these

Answer: ©, At 100 ∘ C, water exist in the form of liquid and vapour.

Q3. Name the state of matter in which the particles move randomly because of a fragile force of attraction.

• All of these

Answer: ©, in gases particles, move randomly because of a fragile force of attraction.

Q4. Which of the following synthetic fibre resembles wool in its properties.

Answer: (b), Acrylic is a synthetic fibre that resembles wool in its properties.

Q5. Which gas is used as a refrigerant in the fridge and air conditioners?

• None of the above

Answer: ©, Freon gas is used as a refrigerant in the fridge and air conditioners.

Q6. Give reasons for the following observation:

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

Answer: The smell of hot sizzling food comes several meters away because the particles of hot food have significant kinetic energy than cold food. Hence, the diffusion rate of hot food is more than that of cold food. Thus, the smell of hot sizzling food comes several meters away, but you have to go close to get the smell of cold food.

Q7. Liquids typically have less density than solids, but ice floats on water. Why?

Answer: Ice has ample space inside its 3D structure, because of which it becomes lighter than water. Thus it floats on water.

Q8. Match the following.

Q9. What are the requirements of a substance to be called matter?

Answer: The provisions of a substance to be called matter are mentioned below.

• It should occupy some space.
• It should have definite mass.
• It should exist in any state of matter, i.e. solid, liquid or gas.
• The five senses of our body should feel it.

Q10. What happens when you spew acetone on your palm?

Answer: Acetone has a shallow boiling point. It instantly vaporises into vapours. The evaporation of the liquid is an endothermic process. Thus, acetone takes up heat from the hand. Therefore, the palm immediately turns cold or even numb.

Q11. What is evaporation? What are various factors that affect the rate of evaporation?

Answer: Evaporation is a kind of vaporisation that generally occurs on a liquid surface and involves the transition of the liquid into a vapour state at any temperature below its boiling point. The evaporation of the liquid is affected by the following factors.

• Temperature
• Surface area

Q12. Why do gold, silver and platinum occur in a free state?

Answer: Gold, Silver and Platinum exist in a free state because metals like platinum, gold and silver are noble metals. They do not readily mix with impurities such as silica, potassium etc. And even if they do mix, we can easily separate them by adding an acid to them. Hence, these metals are present in a free state.

Q13. Convert 49 ∘ C temperature to the kelvin scale:

Answer: Kelvin and Celsius are the two primary scales to measure the temperature. We can get its kelvin value by adding the 273 in degree Celsius scale.

Here degree celsius value is equivalent to 49 ∘ C.

Thus, its kelvin scale value would be 49 + 273 = 322 K.

Q14. Differentiate between evaporation and boiling.

Q15. Differentiate between solid, liquid and gas.

Practise Questions on Matter in our Surrounding

Q1. Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations.

Q2. We found a water sample understudy to boil at 102°C at standard temperature and pressure. Is the water pure? Will this water freeze at 0°C? Comment.

Q3. How can you fasten evaporation?

Q4. How will the evaporation rate affect by

• An increase in the wind speed?
• An increase in the moisture?
• A decrease in disclosed surface area?
• An increase in the temperature of the liquid?

Q5. Mention a few properties of gases.

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Matter around us 01 – learn how to learn.

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Matter in Our Surroundings Class 9 Extra Questions and Answers Science Chapter 1

August 27, 2020 by Veerendra

In this page, we are providing Matter in Our Surroundings Class 9 Extra Questions and Answers Science Chapter 1 pdf download. NCERT Extra Questions for Class 9 Science Chapter 1 Matter in Our Surroundings with Answers will help to score more marks in your CBSE Board Exams.

Class 9 Science Chapter 1 Extra Questions and Answers Matter in Our Surroundings

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

Matter in Our Surroundings Class 9 Extra Questions Very Short Answer Type

Question 1. Define the term ‘matter’. Answer: Matter is defined as anything that occupies some space and has definite mass.

Question 2. What is Law of Conservation of Mass? Answer: Law of Conservation of Mass states that mass can neither be created nor destroyed in a chemical reaction.

Question 3. Define melting point. Answer: It is the temperature at which a solid becomes liquid at atmospheric pressure by absorbing heat.

Question 4. Out of water and alcohol, which is more volatile? Answer: The boiling point of alcohol (78°C or 351K) is lower than that of water (100°C or 373K), therefore, alcohol is more volatile than water.

Question 5. What is sublimation? Answer: Direct conversion of a solid into vapour and vice-versa (i.e., vapour into solid) is called sublimation.

Question 6. Is dry ice the same thing as ordinary ice? Answer: No, dry ice is solid carbon dioxide while ordinary ice is solid water.

Question 7. Define latent heat of fusion. Answer: It is the heat energy required to convert 1 kg of solid into liquid at its melting point at atmospheric pressure.

Question 8. Define vapourisation. Answer: The process of change from liquid state to gaseous (vapour) state is called vapourisation.

Question 9. Give the important properties on the basis of which the three states of matter can be distinguished. Answer: The three states of matter can distinguished on the basis of shape, volume, compressibility, packing of molecules, number of free surfaces, etc.

Question 10. Name the term used for the solid which is directly formed from the gas. Answer: Sublimate.

Question 11. Define the term volatile liquid. Answer: Those liquids which can change into vapour easily are termed as volatile liquids.

Question 12. What is the effect of pressure on boiling point? Answer: Boiling point increases with increase in pressure.

Question 13. Name any two substances which sublime. Answer: Camphor, napthalene, iodine, ammonium chloride.

Question 14. Define condensation. Answer: The change of a gaseous state to a liquid state on cooling is known as condensation.

Question 15. State the effect of surface area on rate of evaporation. Answer: If the surface area is increased, the rate of evaporation increases.

Question 16. Define evaporation. Answer: Evaporation is a physical process in which a liquid changes to its gaseous state, at a temperature lower than its boiling point.

Question 17. What are the ways in which a gas can be liquefied? Answer: Applying pressure and reducing temperature can liquefy gases.

Question 18. What is plasma? Answer: It is a state of matter which consists of super energetic and super excited particles. These particles are in the form of ionised gases.

Question 19. How do solids, liquids and gases differ in shape and volume? Answer: Solids have a definite shape and a fixed volume, liquids have a definite volume but no fixed shape while gases neither have a definite volume nor a definite shape.

Question 20. Kelvin scale of temperature is regarded as better scale than Celsius. Why? Answer: As it has a wide range of measurement and temperature in kelvin scale always has a positive sign, hence regarded as better scale than Celsius.

Matter in Our Surroundings Class 9 Extra Questions Short Answer Type 1

Question 1. What are characteristics of particles of matter? Answer: The particles of matter have following characteristics:

• Particles of matter are very very small.
• Particles of matter have space between them.
• Particles of matter attract each other.
• Particles of matter are constantly moving.

Question 2. Write four main characteristics of solid state of matter. Answer:

• Solids have definite mass, volume and shape.
• The particles in solid state are closely packed and empty spaces in them are negligible.
• Solids are rigid.
• Solids can have a number of free surfaces.

Question 3. Write four main characteristics of liquid state of matter. Answer:

• Liquids have a definite mass and volume.
• A liquid can take the shape of a container.
• Liquids have only one free surface.
• Liquids show the property of diffusion.

Question 4. Write four characteristics of gaseous state of matter. Answer:

• A gas has definite mass but it has neither definite shape nor definite volume.
• Gases can occupy the whole of the space available to them.
• There are larger vacant spaces between the molecules of a gas.
• Gases are highly compressible.

Question 5. Explain evaporation and its cooling effect in terms of kinetic energy of particles. Answer: During evaporation, the molecules which possess higher kinetic energy leave the liquid and go into the space above the liquid as vapour. The remaining molecules possessing lower kinetic energy are left in the liquid state. Consequently, the average kinetic energy decreases which results in the fall of temperature of the liquid.

Question 6. How is heat transferred when a solid sublimes? Answer: Certain solids like iodine, naphthalene, solid CO 2  sublimes on heating. Heat is absorbed by the molecules of these solids rapidly which provides enough kinetic energy to show phase change into gaseous state.

Question 7. Why do gases diffuse rapidly? Answer: Gases diffuse rapidly due to high speed of the particles and large space between them.

Question 8. For any substance, why does the temperature remain constant during the change of state? Answer: On increasing the temperature of a substance, for example a solid, the kinetic energy of the particles increases which is used to overcome the forces of attraction between the particles therefore the temperature remains constant during the change of state.

Question 9. Explain compressibility in gases with an example. Answer: Liquefied petroleum gas (LPG) cylinders are used in our homes for cooking, contains gases in the compressed state. Similarly, compressed natural gas (CNG) is used as a fuel in vehicles. Large volume of gases can be compressed in small cylinders and are transported to distant places.

Question 10. Why solids cannot be compressed like gases? Answer: The particles in solids are so tightly packed that there are no or little interparticle spaces left among them. Therefore solids are not compressible like gases. Gases which have large interparticle spaces are therefore compressible.

Question 11. Define boiling. Why is boiling considered as bulk phenomenon? Answer: Rapid and breaking of bubbles in the bulk of a liquid being heated is called boiling. During boiling particles from the bulk of liquid gain enough energy to get converted to vapour. Therefore it is a bulk phenomenon.

Question 12. Why do we see water droplets on the outer surface of a glass containing ice-cold water? Answer: The water vapour present in air, on coming in contact with the cold glass of water, loses energy and gets converted to liquid state, which we see as water droplets.

Question 13. Why do we sprinkle water on the roof or open ground in summer? Answer: During hot summer evenings, we often sprinkle water on the roof of the house or open ground in front of our house. The water evaporates by absorbing heat from the ground and the surrounding air. By losing heat, the ground becomes cool and we feel comfortable.

Question 14. Why is ice rubbed on a burnt part of the skin? Answer: When a finger or some part of our body gets burnt, we rub the burnt portion with an ice cube. The reason being that due to burning, the temperature of the injured skin increases. When ice is rubbed, the excess heat from the skin is taken away by large latent heat of fusion of water. As a result, the temperature of the injured skin decreases and we feel less pain.

Question 15. How will you demonstrate that particles of matter are continuously moving? Answer: When an incense stick is lit in one corner of a room, we get the smell while sitting at a distance from the stick. This is because the particles of matter are continuously moving. Because of their random motion, the particles of incense mix with the particles of air rapidly and the smell of the incense reaches us even when we are sitting at a distance from the incense stick.

Question 16. Why do solids expand a bit on heating and contract a bit on cooling? Answer: The solid molecules do not have sufficient intermolecular (or interparticle) space thus its expands a bit on heating. The interparticle forces of attraction are very strong which do not let solid particles leave their mean positions. Therefore solid contracts a bit on cooling.

Question 18. Why is light not considered matter? Answer: Matter occupies space and has mass. Light has neither of the two and that is why it is not considered as matter. It is considers as a form of energy and electromagnetic radiation.

Question 19. Convert the following temperatures: (a) – 78.0°C to kelvin (b) 775 K to °C (c) 489 K to °C (d) 24°C to kelvin Answer: (a) – 78 + 273 = 195 K (b) 775 – 273 = 502°C (c) 489-273 = 216°C (d) 24 + 273 = 297 K

Question 20. Mention the difference between gas and vapour. Answer: Gas – The gas is a substance which exists in the gaseous state at a temperature equal to or more than the boiling point of its liquid state. For example oxygen, hydrogen, nitrogen, etc.

Vapour – A vapour is a substance which exists in the gaseous state such that its temperature is lower than that of boiling point of its liquid state. For example, water vapour, iodine vapour, etc.

Question 21. 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. Answer: It’s freezing point will be below 0°C due to the presence of a non-volatile impurity in it.

Question 22. Water as ice has a cooling effect, whereas water as steam may cause severe burns. Explain these observations. [NCERT Exemplar] Answer: In case of ice, the water molecules have low energy while in the case of steam the water molecules have high energy. The high energy of water molecules in steam is transformed as heat and may cause burns. On the other hand, in case of ice, the water molecules take energy from the body and thus gave a cooling effect.

Question 23. 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? [NCERT Exemplar] Answer: Cotton being a better absorber of water than nylon helps in absorption of sweat followed by evaporation which leads to cooling. So Priyanshi would be more comfortable than Ali.

Question 24. 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? [NCERT Exemplar] Answer: Conditions that can increase the rate of evaporation of water are:

• An increase of surface area by spreading the shirt
• An increase in temperature by putting the shirt under the Sun
• An increase the wind speed by spreading it under the fan.

Matter in Our Surroundings Class 9 Extra Questions HOTS

Question 1. Arrange the following substances in increasing order of force of attraction between the particles. (a) Milk (b) Salt (c) Oxygen Answer: Oxygen < Milk < Salt.

• Take two balloons of different shapes. For example, one round and one heart shape or cylindrical.
• Fill the balloons with air.

Observation: Air takes up the shape of balloon.

Conclusion: This shows air has no definite shape or volume. It takes up the shape of the balloon.

Question 3. Name the change of state during the following changes: (a) Drying of wet clothes (b) Melting of wax (c) Melting of ice (d) Formation of clouds Answer: (a) Liquid to gaseous state (b) Solid to liquid state (c) Solid to liquid state (d) Liquid to gaseous state

Question 4. With proper explanation, explain whether the following statements are true or false? (a) Sublimation occurs only when the solid is heated. (b) A lighter gas can move downwards and a heavier gas can move upwards. (c) Interconversion of matter is a constant temperature process. Answer: (a) Statement is wrong. Sublimation may occur on its own or by heating, e.g., camphor, naphthalene, iodine, etc., sublime slowly at room temperature.

(b) Statement is true. Diffusion occurs against the law of gravitation. Therefore, lighter gases can also diffuse downwards and the heavier gases can also diffuse upwards. However rate of diffusion of lighter gases is faster than those of heavier gases.

(c) Statement is true. During interconversion of state of matter from solid to liquid or from liquid to gas, it tends to reach its melting point or boiling point. At this point, the temperature remains constant unit it has changed in another state.

Question 5. What is meant by Bose-Einstein Condense? Answer: (a) In 1920, Indian scientist Satyendra Nath Bose did some calculations, based on which Albert Einstein predicted that a new state of matter should exist.

(b) This new state was named as Bose-Einstein Condensate (BEC). In 2001, Cornell, Ketterie and Wieman of USA received Noble Prize for actually making this state in laboratory. BEC is made by cooling gas of very low density to super low temperature.

Matter in Our Surroundings Class 9 Extra Questions Value Based (VBQs)

Question 1. In a hot summer day, Rajeev wants to watch a movie in a nearest cineplex. His mother wears a nylon saree so Rajeev suggest her to wear cotton saree. (i) Why does Rajeev suggest her to wear cotton saree and not nylon saree? (ii) Mention the values exhibited by Rajeev. Answer: (i) On a hot summer day, we sweat a lot. Cotton clothes absorb sweat from the body. As the sweat evaporates it results in cooling giving comfort to the body.

(ii) Caring, use of knowledge of science.

Question 2. Mohan was getting late for school. He tried to sip tea from the cup. His father advised him to use a plate and asked him to sip the tea from the plate. Mohan followed the advice and finished his tea very easily. (i) Why is siping off tea easier from a plate? (ii) Mention the values exhibited by Mohan’s father. Answer: (i) A plate has a larger surface area than a cup. Evaporation becomes faster in this case. Since cooling is always caused during evaporation the temperature got lowered. Therefore it became easier to sip tea from a plate.

(ii) Caring, use of knowledge of science, helpful.

CBSE Assertion Reason Questions for Class 9 Science Matter In Our Surroundings Free PDF

Mere Bacchon, you must practice the CBSE Assertion Reason Questions for Class 9 Science Matter In Our Surroundings  in order to fully complete your preparation . They are very very important from exam point of view. These tricky Assertion Reason Questions can act as a villain in your heroic exams!

I have made sure the questions (along with the solutions) prepare you fully for the upcoming exams. To download the latest CBSE Assertion Reason Questions , just click ‘ Download PDF ’.

CBSE Assertion Reason Questions for Class 9 Science Matter In Our Surroundings PDF

Checkout our assertion reason questions for other chapters.

• Chapter 2 Is Matter Around Us Pure Assertion Reason Questions  
• Chapter 3 Atoms and Molecules Assertion Reason Questions  
• Chapter 4 Structure of the Atom Assertion Reason Questions  
• Chapter 5 The Fundamental Unit of Life Assertion Reason Questions  

How should I study for my upcoming exams?

First, learn to sit for at least 2 hours at a stretch

Solve every question of NCERT by hand, without looking at the solution.

Solve NCERT Exemplar (if available)

Sit through chapter wise FULLY INVIGILATED TESTS

Practice MCQ Questions (Very Important)

Practice Assertion Reason & Case Study Based Questions

Sit through FULLY INVIGILATED TESTS involving MCQs. Assertion reason & Case Study Based Questions

After Completing everything mentioned above, Sit for atleast 6 full syllabus TESTS.

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Extra Questions for Class 9th: Ch 1 Matter in Our Surrounding Science

Extra questions for class 9th: ch 1 matter in our surrounding  (science) important questions answer included, contact form.