class 9 science case study questions 2021

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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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Case Study Questions Class 9 Science Gravitation

Case study questions class 9 science chapter 10 gravitation.

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

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

CBSE Case Study Questions Class 9 Science – Gravitation

(1) Every object in the universe attracts every other object with a force which is proportional to the product of their masses (m1*m2) and inversely proportional to the square of the distance (d 2 ) between them. The force is along the line joining the centers of two objects.

(i)Gravitational force does not depend on

(a) Masses of objects

(b) Separation between objects

(c) Charges on objects

(d) None of these

(ii) Force of gravitation varies with masses of object as

(a) Product of masses

(b) Sum of masses

(c) Difference of masses

(iii) When mass of one body is doubled then force of gravitation will become

(a) Force will remain same

(b) Force will become double

(c) Force will become halved

(iv)What is universal gravitational constant? What is its SI unit?

(v) Two objects of masses 10kg and 20kg separated by distance 10m. What is gravitational force between them?

Answer key-1

(iv) The force of attraction between any two unit masses separated by a unit distance is called universal gravitational constant denoted by G measured in Nm 2 /kg 2 .

(v) Mathematically,

(2) We know that the earth attracts every object with a certain force and this force depends on the mass ( m ) of the object and the acceleration due to the gravity ( g ). The weight of an object is the force with which it is attracted towards the earth. Mathematically

Where, W= weight of object

m= mass of object

g= acceleration due to the gravitational force

As the weight of an object is the force with which it is attracted towards the earth, the SI unit of weight is the same as that of force, that is, Newton (N). The weight is a force acting vertically downwards; it has both magnitude and direction. We have learnt that the value of g is constant at a given place. Therefore at a given place, the weight of an object is directly proportional to the mass, say m, of the object, that is, W αm. It is due to this reason that at a given place, we can use the weight of an object as a measure of its mass. Answer the following questions.

(i) Unit of acceleration due to the gravity ( g ) is

(c) Newton(N)

(ii) Direction of weight of any object is 

(a) Always towards centre of earth

(b) Always away from centre of earth

(c) Weight don’t have direction

(iii) Which of the following has same unit

(a) Mass and weight

(b) Weight and force

(c) Velocity and acceleration

(iv) Whether weight is scalar quantity or vector quantity? Justify your answer.

(v) Differentiate between mass and weight.

Answer key-2

(iv) Weight is vector quantity as it has magnitude as well as direction which is always towards centre of a earth.

(v) Difference between mass and weight is given below

(3) Archimedes’ principle, stated as follows: When a body is immersed fully or partiallyin a fluid, it experiences an upward force thatis equal to the weight of the fluid displacedby it. The upward force is known as up thrust or buoyant force. In fact, all objects experience a force of buoyancy when they are immersed in a fluid. The magnitude of this buoyant force depends on the density of the fluid.Objects having density less than that of the liquid in which they are immersed float on the surface of the liquid. If the density of the object is more than the density of the liquid in which it is immersed then it sinks in the liquid. Hence body will float or sink depends upon difference between density of body and fluid.

(i)The up thrust of the body is equal to the

(a) Mass of liquid

(b) Weight of liquid

(c) Weight of liquid displaced by body

(ii) If the density of the object is more than the density of the liquid in which it is immersed then

(a) It sinks in liquid

(b) It floats on liquid

(c) It comes out of liquid

(iii) When anybody immersed in liquid it experience a force called as

(a) Gravitational force

(b) Buoyancy force

(c) Nuclear force

(iv) State Archimedes’ principle.

(v) Why does cube of plastic released deep down under the water come up to surface of water?

Answer key-3

(iv) Archimedes’ principle, stated as follows: When a body is immersed fully or partially in a fluid, it experiences an upward force thatis equal to the weight of the fluid displaced by it.

(v) Cube of plastic released deep down under the water come up to surface of water because it has less density than that of water also it experiences upward buoyancy force on it due to liquid.

(4 ) As you know, the density of a substance is defined as mass of a unit volume. The unit ofdensity is kilogram per meter cube (kg/m -3 ). The density of a given substance, under specified conditions, remains the same. Therefore the density of a substance is one of its characteristic properties. It is different for different substances. For example, the density of gold is 19300 (kg/m -3 ) while that of water is 1000 (kg/m -3 ). The density of a given sample of a substance can help us to determine its purity. It is often convenient to express density of a substance in comparison with that of water. The relative density of a substance is the ratio of its density to that of water:

Density of a substance

Relative density =

Density of water

Since the relative density is a ratio of similar quantities, it has no unit. Answer the following.

(i) SI unit of density is

(b) kg /m 2

(c) kg /m 3

(ii) SI unit of relative density is

(b) No unit

(c) kg /s 3

(iii) Relative density of water is

(iv)Define relative density.

(v) Comment of relative density value of substance which

(1) Sink in water

(2) float on water

Answer key-4

(iv) The relative density of a substance is defined as the ratio of density of that substance to that of density of water.

(v) Relative density of substance which sinks in water is greater than one. That is density of that substance is more than density of water. While Relative density of substance which float on water is less than one. That is density of that substance is less than density of water.

(5) The force acting on an object perpendicular to the surface is called thrust. When you stand on loose sand, the force, that is, the weight of your body is acting on an area equal to area of your feet. When you lie down then the same force acts on an area equalto the contact area of your whole body, which is larger than the area of your feet. Thus, the effects of forces of the same magnitude on different areas are different. In the above cases, thrust is the same. But effects are different. Therefore the effect of thrust depends on the area on which it acts. The effect of thrust on sand is larger while standing than while lying. The thrust on unit area is called pressure.

Pressure=thrust/area. SI unit of pressure as N/m 2 or Pascal.

(i) SI unit of thrust is

(ii) We have two different areas A and B. where A>B. Then relation between pressure on A(P A ) and pressure on B (P B ) is

(a) P A> P B

(b) P B> P A

(c) P A= P A

(iii)SI unit of pressure is

(b) Pascal.

(c) Both a and b

(iv) The effects of forces of the same magnitude on different areas are different. True or false

(c) None of these

(v) Define pressure.

Answer key-5

(v) pressure is defined as thrust or perpendicular force acting per unit area

Case 3 III) question answer is buoyancy

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

Last Updated on September 1, 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

Case study questions for other chapters of class 9 science is given below.

• Work and Energy Class 9 Case Study Questions Science Chapter 10
• Gravitation Class 9 Case Study Questions Science Chapter 9
• Force and Laws of Motion Class 9 Case Study Questions Science Chapter 8
• Motion Class 9 Case Study Questions Science Chapter 7
• Tissues Class 9 Case Study Questions Science Chapter 6

The Fundamental Unit of Life Class 9 Case Study Questions Science Chapter 5

Is matter around us pure class 9 case study questions science chapter 2.

We hope the given case study question

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.

Helpful Links for CBSE Class 9 Science Preparation

• Download Latest Sample Papers for CBSE Class 9 Science
• Download Worksheets for CBSE Class 9 Science
• Download Chapter Tests for CBSE Class 9 Science
• Download Case Study Question Bank for CBSE Class 9 Science
• Download Numerical Problems for CBSE Class 9 Physics
• Download Important MCQs for CBSE Class 9 Physics

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

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Class 9 Science Case Study Questions Chapter 11 Work and Energy

• Post author: studyrate
• Post published:
• Post category: class 9th
• Post comments: 1 Comment

Case study Questions in Class 9 Science Chapter 11  are very important to solve for your exam. Class 9 Science Chapter 11 Class 9 Science 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 11 Work and Energy

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.

Work and Energy Case Study Questions With Answers

Here, we have provided case-based/passage-based questions for Class 9 Science  Chapter 11 Work and Energy

Case Study/Passage-Based Questions

Case Study 1: The figure shows a watch glass embedded in clay. A tiny spherical ball is placed at edge B at a height h above the center A

The kinetic energy of the ball, when it reaches point A is (a) zero (b) maximum (c) minimum (d) can’t say

Answer: (b) maximum

The ball comes to rest because of (a) frictional force (b) gravitational force (c) both (a) and (b) (d) none of these

Answer: (c) both (a) and (b)

The energy possessed by the ball at point C is (a) potential energy (b) kinetic energy (c) both potential and kinetic energy (d) heat energy.

Answer: (a) potential energy

Case Study 2: The principle of conservation of energy states that the energy in a system can neither be created nor be destroyed. It can only be transformed from one form to another, but the total energy of the system remains constant. Conservation of electrical energy to various forms or vice versa along with devices is illustrated in the figure given below.

Water stored in a dam possesses (a) no energy (b) electrical energy (c) kinetic energy (d) potential energy.

Answer: (d) potential energy.

A battery lights a bulb. Describe the energy changes involved in the process. (a) Chemical energy →Light energy → Electrical energy (b) Electrical energy → Chemical energy → Electrical energy (c) Chemical energy → Electrical energy → Light energy (d) None of these.

Answer: (c) Chemical energy → Electrical energy → Light energy

Name a machine that transforms muscular energy into useful mechanical work. (a) A microphone (b) Bicycle (c) Electric torch (d) An electric bell

Answer: (b) Bicycle

A body is falling from a height of h. After it has fallen a height h/2 , it will possess (a) only potential energy (b) only kinetic energy (c) half potential and half kinetic energy (d) more kinetic and less potential energy.

Answer: (c) half potential and half kinetic energy

Case Study 3: An elevator weighing 500 kg is to be lifted up at a constant velocity of 0.4 m s –1 . For this purpose, a motor with the required horsepower is used

The power of the motor is (a) 1940 W (b) 1950 W (c) 1960 W (d) 1970 W

Answer: (c) 1960 W

The power of motor in hp is (a) 2.33 (b) 2.43 (c) 2.53 (d) 2.63

Answer: (d) 2.63

Case Study 4: Work and energy are fundamental concepts in physics that help us understand the physical world and the processes happening around us. Work is done when a force is applied to an object, and the object moves in the direction of the applied force. It is calculated as the product of force and displacement. The unit of work is joule (J). Energy, on the other hand, is the ability to do work. It exists in different forms, such as kinetic energy, potential energy, and various other forms like thermal energy, electrical energy, and chemical energy. The law of conservation of energy states that energy cannot be created or destroyed, but it can be transformed from one form to another. Understanding the concepts of work and energy helps us analyze the efficiency of machines, calculate the amount of work done, and comprehend various physical phenomena.

When is work considered to be done on an object? a) When a force is applied to the object b) When the object moves in the direction of the applied force c) When the object remains stationary d) When the object changes its shape Answer: b) When the object moves in the direction of the applied force

How is work calculated? a) Force multiplied by velocity b) Force multiplied by acceleration c) Force multiplied by displacement d) Force divided by time Answer: c) Force multiplied by displacement

What is the unit of work? a) Newton (N) b) Meter (m) c) Joule (J) d) Watt (W) Answer: c) Joule (J)

What is energy? a) The ability to do work b) The force applied to an object c) The distance traveled by an object d) The mass of an object Answer: a) The ability to do work

According to the law of conservation of energy, what happens to energy? a) It can be created b) It can be destroyed c) It can be transformed from one form to another d) It remains constant Answer: c) It can be transformed from one form to another

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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) Balloon will shrink, particles will move slower and become close together.

When an inflated balloon is placed in the refrigerator, the temperature decreases. This causes the gas particles inside the balloon to move slower and come closer together, resulting in the balloon shrinking. 

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

Sublimation is the process by which a solid changes directly into a gas without passing through the liquid state.

Q3: A substance melts at 5°C and boils at 150°C. What will be its physical state at room temperature?  Ans:  Room temperature (around 25°C) is between the melting point (5°C) and the boiling point (150°C) of the substance. Therefore, the substance will be in the liquid state at room temperature. 

Q4: Why do we feel more cold after taking bath with hot water? Ans:  We feel more cold after taking a bath with hot water because when we step out of the hot water, the water on our skin starts to evaporate. The evaporation process requires heat, which is taken from our body, causing a cooling effect and making us feel colder. 

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

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

Q4: What does BC represent? Ans:  It represents a vapour state, and particles absorb heat and become more energetic. The temperature of the 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:   

• At –150°C: Substance – 4 will be in the solid state.
• At –100°C: Substance – 4 will be in the gaseous state.

The melting point of Substance – 4 is –169°C, and its boiling point is –104°C. Therefore, at –150°C (which is above its melting point but below its boiling point), Substance – 4 will be a solid. At –100°C (which is above its boiling point), it will be a gas.

Q2: What is physical state of substance – 1 and 3 at room temperature? Ans: 

• Substance – 1: The physical state cannot be determined solely based on the information that it is brittle. However, substances that are brittle are often solids at room temperature.
• Substance – 3: Solid.

Substance – 1: Brittle substances are typically solid (e.g., certain metals, minerals, and salts). Substance – 3: With a high melting point of 800°C, it will be in the solid state at room temperature (~25°C).

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

The melting point of Substance – 2 is 5°C, and its boiling point is 150°C. Therefore, at 100°C, Substance – 2 will be in the 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.

The strength of the force of attraction between particles can be inferred from the melting point. Substance – 3 has the highest melting point (800°C), indicating that it has the strongest force of attraction between its particles.

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CBSE Sample Papers for Class 9 Science

Class 9 Science needs a detailed study as students are introduced to various new topics that would act as the base for their future studies. CBSE revamps the syllabus and pattern from time to time so that students get the latest knowledge. With the changed syllabus and pattern, it is probable that students may feel stressed. To reduce their stress and help them in exam preparation, we have provided the CBSE Sample Papers for Class 9 students.

CBSE Sample papers for Class 9 Science are the best way to practise concepts and prepare for annual exams. Students can get acquainted with the real question paper pattern along with the marking scheme. It will help them in analysing the exam preparation level. Students must try to solve all the questions whether it is of 1 mark, 2 marks, 3 or 5 marks. Go through all the important diagrams and practise them, as these can help students add extra marks. These sample papers adhere to the CBSE Class 9 Syllabus and cover all the important chapters of NCERT Books from an exam perspective.

CBSE Class 9 Sample Papers 2021

• CBSE Class 9 Science Sample Paper 2021 PDF – Set 1
• CBSE Class 9 Science Sample Paper 2021 PDF – Set 2

CBSE Class 9 Sample Papers- Based on Old Pattern

We have also provided the unsolved Class 9 Sample Paper for students’ practice. Download and practise them to be thorough with the question paper pattern and difficulty level of the exam.

CBSE Class 9 Science SA1 and SA2 Sample Papers

Students can also access the CBSE Class 9 Science sample papers for SA1 and SA2 exams from the table below.

Features of CBSE Class 9 Science Sample Papers

The  CBSE Sample Papers  provided here have the following features:

• These papers are created by the subject experts exclusively for CBSE Class 9 students.
• The papers are created as per the latest exam pattern and syllabus.
• Sample papers cover important topics from an exam perspective.
• Some difficult questions are also included in the papers so that students get good practice for the exam.

We hope students have found this information on “CBSE Class 9 Sample Papers” useful for their exam preparation. Solving these papers will boost their exam preparation. Keep learning and stay tuned for further updates on CBSE and other competitive exams. Download the BYJU’S App and subscribe to the YouTube channel to access interactive Maths and Science videos.

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