case study for class 8th science

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Cbse, ncert and icse solution online, class 8 science case study question, case study question class 8 science (cbse / ncert board).

Class 8 Science Case Study Question and Answer: CBSE / NCERT Board Class 8 Science Case Study Question prepared by expert Science Teacher. Students can learn Case Based Question / Paragraph Type Question for NCERT Class 8 Science.

There are total 18 chapter Crop Production and Management, Microorganisms: Friend and Foe

, Synthetic Fibres and Plastics, Materials: Metals and Non-Metals, Coal and Petroleum, Combustion and Flame, Conservation of Plants and Animals, Cell – Structure and Functions, Reproduction in Animals, Reaching the Age of Adolescence, Force and Pressure, Friction, Sound, Chemical Effects of Electric Current, Some Natural Phenomena, Light, Stars and the Solar System, Pollution of Air and Water

For any problem during learning any Case or any doubts please comment us. We are always ready to help You.

CBSE Class 8 Science Case Study Question

• Chapter 1 Crop Production and Management Case Study Question
• Chapter 2 Microorganisms: Friend and Foe Case Study Question
• Chapter 3 Synthetic Fibres and Plastics Case Study Question
• Chapter 4 Materials: Metals and Non-Metals Case Study Question
• Chapter 5 Coal and Petroleum Case Study Question
• Chapter 6 Combustion and Flame Case Study Question
• Chapter 7 Conservation of Plants and Animals Case Study Question
• Chapter 8 Cell – Structure and Functions Case Study Question
• Chapter 9 Reproduction in Animals Case Study Question
• Chapter 10 Reaching the Age of Adolescence Case Study Question
• Chapter 11 Force and Pressure Case Study Question
• Chapter 12 Friction Case Study Question
• Chapter 13 Sound Case Study Question
• Chapter 14 Chemical Effects of Electric Current Case Study Question
• Chapter 15 Some Natural Phenomena Case Study Question
• Chapter 16 Light Case Study Question
• Chapter 17 Stars and the Solar System Case Study Question
• Chapter 18 Pollution of Air and Water Case Study Question

What is Case Study Question?

Ans. At case Study there will one paragraph and on the basis of that concept some question will made. Students have to solve that question.

How many marks will have at case based question?

Most of time 5 questions will made from each case. There will 1 or 2 marks for each question.

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• Important Questions For Class 8 Science

CBSE Important Questions for Class 8 Science

CBSE Important Questions for Class 8 Science help students face the exams confidently. As the exam nears, they should complete the syllabus and start with the revision. The CBSE Important Questions for Class 8 Science will help them revise the subject quickly. Here, we have compiled the important questions for all the chapters of the CBSE Class 8 Science subject. By solving them, students will understand the types of questions asked in the exam. All types of questions are provided for students’ practice from basic to high level. CBSE Class 8 Science is a fascinating subject and includes interesting topics, thus providing basic knowledge about light, current, force, human beings, etc. Solving these CBSE Class 8 Science Important Questions is the best way to revise the major concepts of the subject.

The subject experts created the questions based exclusively from the exam perspective. Students must start solving them at least 20 days before the annual exam. By doing so, they will be able to analyse their weak areas and work on them. Practising the CBSE Important Questions will improve their performance and overall score in CBSE Class 8 Science exam.

There is a total of 18 chapters in NCERT Class 8 Science book. In the table below, we have provided the Important Questions for CBSE Class 8 Science for all the chapters. We have also included all types of questions, i.e. very short, short and long answers. These questions will cover all the crucial topics and the CBSE Class 8 Science syllabus.

How to Practise the CBSE Class 8 Science Important Questions

• Practise the question of a particular chapter in one go.
• Refrain from looking for the answer while solving the questions.
• Allocate a time duration for solving the questions and try to finish it accordingly.
• After completing all the questions, do a self-evaluation.
• Go through those questions again that could not be solved.

We, at BYJU’S, also provide other study materials such as CBSE Class 8 Science sample papers , notes, exemplars, solutions, etc.

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• Friction Class 8 Case Study Questions Science Chapter 9

Last Updated on May 16, 2024 by XAM CONTENT

Hello students, we are providing case study questions for class 8 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 8 science. In this article, you will find case study questions for cbse class 8 science chapter 9 Friction.

Table of Contents

Case Study Questions on Friction

Question 1:

Read the given passage below and answer the question:

(I) The force required to overcome friction at the instant an object starts moving from rest is a measure of static friction. On the other hand, the force required to keep the object moving with the same speed is a measure of sliding friction. The sliding friction is slightly smaller than the static friction. When one body rolls over the surface of another body, the resistance to its motion is called rolling friction. Rolling reduces friction. It is always easier to roll than to slide a body over another.

Q.1. The following options show arrangement of types of friction according to decreasing order of applied friction. Select the correct order. (a) Rolling > Sliding > Static (b) Static > Rolling > Sliding (c) Sliding > Static > Rolling (d) Static > Sliding > Rolling

Difficulty Level: Easy

Ans. Option (d) is correct. Explanation: Rolling friction is least among all three types because the surface of wheels has minimal contact with the surface on which it rolls, thus minimising friction.

Q.2. In which of the following case one will have to apply maximum force? (a) Riding a bicycle (b) Trying to move a heavy rock from its resting place (c) Swimming in a pool (d) Drilling a hole in a wall

Ans. Option (b) is correct. Explanation: Stationary rock will experience static friction. Static friction is the highest; thus it will require maximum force or efforts to move it from its rest position.

Q.3. Oiling or greasing in machine parts: (a) Increases the friction between the parts (b) Decreases the friction between the parts (c) Both (a) and (b) are correct. (d) None of the above

Ans. Option (b) is correct.

Explanation: Oiling and greasing act as a lubricant. When oil, grease or graphite is applied between the moving part of a machine, a thin layer is formed there and moving surfaces do not directly rub against each other. Interlocking of irregularities is avoided to a great extent. Movement becomes smooth.

Q.4. Why static friction is more than sliding friction?

Ans. The friction is caused by the interlocking of irregularities in the two surfaces. It is obvious that the force of friction will increase if the two surfaces are pressed harder. The force required to overcome friction at the instant an object starts moving from rest is a measure of static friction. On the other hand, the force required to keep the object moving with the same speed is a measure of sliding friction. When the box starts sliding, the contact points on its surface, do not get enough time to lock into the contact points on the floor. So, the sliding friction is slightly smaller than the static friction.

Q.5. Classify the given examples into static, sliding and rolling friction Papers on a table, a box sliding on an inclined plain, car parked on a hill, ball moving on the ground, child playing on slide in a park, tyres of a bus.

Ans. Static Friction: Papers on a table, car parked on a hill. Sliding Friction: A box sliding on an inclined plain, child playing on slide in a park Rolling Friction: Ball moving on the ground, tyres of a bus.

• Sound Class 8 Case Study Questions Science Chapter 10
• Force and Pressure Class 8 Case Study Questions Science Chapter 8
• Reaching the Age of Adolescence Class 8 Case Study Questions Science Chapter 7
• Reproduction in Animals Class 8 Case Study Questions Science Chapter 6
• Conservation of Plants and Animals Class 8 Case Study Questions Science Chapter 5
• Combustion and Flame Class 8 Case Study Questions Science Chapter 4
• Coal and Petroleum Class 8 Case Study Questions Science Chapter 3

Microorganisms: Friend and Foe Class 8 Case Study Questions Science Chapter 2

Crop production and management class 8 case study questions science chapter 1, topics from which case study questions may be asked.

• Learn the concept of friction.
• Understand the factors that affect frictional force.
• Learn the different types of friction.
• Understand the advantages and disadvantages of friction.
• Learn the methods to increase or decrease friction.
• Understand the concept of fluid friction and methods to reduce it.

The force which opposes the relative motion between two surfaces in contact is called friction. Friction is a necessary evil that makes us walk, write, hold things, etc. The liquids and gases also exert opposition forces on objects moving through them. This is called fluid friction.

Frequently Asked Questions (FAQs) on Friction 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 8 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 friction, and formulate well-supported solutions or responses.

Q4: Are there any resources available online for students to practice case study questions on class 8 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.

Q5: How can students effectively prepare for case study questions on friction 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 friction class 8 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 concepts of friction.

Q7: Why soles of the rubber slippers become slippery after prolonged use?

A7: While walking the slipper’s sole and ground surface experiences friction which causes the sole to wear off.

Q8: What are lubricants? How do they work? Give two examples.

A8: The substances which reduce friction are called lubricants. Example Oil, grease, graphite etc. They work by forming a thin layer between machine parts. As a result, the moving surfaces do not directly rub against each other. Interlocking of irregularities is avoided to a great extent. Movement becomes smooth.

Q9: Will the force of friction come into play, when a rain drop rolls down a glass window pane?

A9: Yes, friction comes into play when two surfaces are in contact, e.g., glass and water in this case.

Q10: While playing tug of war, Preeti felt that the rope was slipping through her hands. Suggest a way out for her to prevent this.

A10: To prevent slipping the rope from her hands, Preeti has to make her hands somewhat non-smooth, so she can rub her hands by introducing the sand between them.

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Cbse class 8 - physics - sound - case study based question #class8science #sound #physics #eduvictors.

CBSE Class 8 - Physics - Sound - Case Study Based Question

Q1. Read the following and answer the questions given below:

Sound is a form of energy that is produced when air molecules vibrate in a particular pattern called waves. Hence, the sound is a wave. Sound is produced by vibrating objects. Vibration can be described as to and fro motion of an objects. Sound cannot be produced without any vibrations. Sound always requires a medium to travel from the source of its production to the receiver end. Speed of the sound is maximum in solids and minimum in gases.

(i) The audible frequency range of a human ear is:

(a) The range of audible frequency of human ear is 20 to 200 Hz

(b) The range of audible frequency of human ear is 2 Hz to 20 Hz

(c)The range of audible frequency of human ear is 200 to 2000Hz.

(d) The range of audible frequency of human ear is 20 to 20,000Hz

(ii) Ria used a device to measure the loudness of a machine. She recorded her observation as given below. Which of the following represents the correct measurement of loudness?

(iii) Arrange the speed of sounds in solids, liquids and gases in an ascending order:

(a) Gas < Liquid < Solid

(b) Liquid > Gas > Solid

(c) Liquid < Solid < Gas

(d) Solid > Liquid > Gas

(iv) The number of vibrations made by a vibrating body in one second is:

(a) frequency

(c) loudness

1.  (d) The range of audible frequency of human ear is 20 to 20,000Hz

2.  (c) 80 dB

3.  (a) Gas < Liquid < Solid

4.  (a) frequency

Ch 13 - Sound (Q & A) Ch 13 - Sound (MCQs) Ch 13 - Sound (Worksheet) Ch 13 - Sound (Question Bank) Ch 13 - Sound (Worksheet)

CBSE All In One NCERT Based Science Class 8 2022-23 Edition

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NCERT Solutions for Class 8 Science

Ncert solutions for class 8 science - free pdf download.

NCERT Solutions for Class 8 Science Chapterwise PDF

• NCERT Solutions for Chapter 1 - Crop Production and Management
• NCERT Solutions for Chapter 2 - Microorganisms: Friend and Foe
• NCERT Solutions for Chapter 3 - Synthetic Fibres and Plastics
• NCERT Solutions for Chapter 4 - Materials: Metals and Non-Metals
• NCERT Solutions for Chapter 5 - Coal and Petroleum
• NCERT Solutions for Chapter 6 - Combustion and Flame
• NCERT Solutions for Chapter 7 - Conservation of Plants and Animals
• NCERT Solutions for Chapter 8 - Cell: Structure and Functions
• NCERT Solutions for Chapter 9 - Reproduction in Animals
• NCERT Solutions for Chapter 10 - Reaching the Age of Adolescence
• NCERT Solutions for Chapter 11 - Force and Pressure
• NCERT Solutions for Chapter 12 - Friction
• NCERT Solutions for Chapter 13 - Sound
• NCERT Solutions for Chapter 14 - Chemical Effects of Electric Current
• NCERT Solutions for Chapter 15 - Some Natural Phenomena
• NCERT Solutions for Chapter 16 - Light
• NCERT Solutions for Chapter 17 - Stars and The Solar System
• NCERT Solutions for Chapter 18 - Pollution of Air and Water

Why Class 8 NCERT Solutions of Science are important

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Question Bank for 8th Class Science

Select chapter, recent question banks, pollution of air and water, practice now, solar system and some natural phenomenon, chemical effects of current and light, force, friction and sound, reproduction and adolescence, cell structure and function, conservation of plants and animals, coal and petroleum, crop production and microorganisms, stars and solar system, some natural phenomena, chemical effects of electric current, force and pressure, reproduction and endocrine system.

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Coal and Petroleum Class 8 Science Extra Questions and Answers

Coal and Petroleum Class 8 Science Chapter 5 Extra Questions and Answers are provided here. We prepared these extra questions based on the latest NCERT Class 8 Science Book. CBSE Class 8 Science Chapter 5 Coal and Petroleum Extra Questions will help you to properly understand a particular concept of the chapter.

Class 8 Science Chapter 5 Coal and Petroleum Extra Questions

Very short answer type question.

Question 1: Why LPG is a better fuel than coal?

Answer: LPG is a better fuel than coal because it is a cleaner fuel.

Question 2: Name the petroleum product used for surfacing of roads.

Answer: Bitumen, a petroleum product, is used for metalling the roads.

Question 3: What are natural resources?

Answer: Materials obtained from nature are called natural resources.

Question 4: What are the characteristics of coal? Or Give two characteristics of coal.

Answer: It is as hard as stone and is black in colour.

Question 5: Which fuel is used in heavy motor vehicles?

Answer: Diesel is used in heavy motor vehicles.

Question 6: Where and when was the world’s first oil well drilled?

Answer: The world’s first oil well was drilled in Pennsylvania, USA, in 1859.

Question 7: What are the uses of kerosene?

Answer: Kerosene is used as fuel in stoves, lamps and in jet aircrafts.

Question 8: Why is lubricating oil used?

Answer: Lubricating oil is used for lubrication.

Question 9: Write the uses of paraffin wax.

Answer: Paraffin wax is used in ointments, candles, vaseline etc.

Question 10: From where do we obtain petrol and diesel?

Answer: Petrol and diesel are obtained from a natural resource called petroleum.

Question 11: How can bitumen be used? Or Write uses of bitumen.

Answer: Bitumen can be used for making paints and for surfacing the roads.

Question 12: Give two uses of diesel. Or Write two uses of diesel.

Answer: Diesel is used as fuel for heavy motor vehicles and in electric generators.

Question 13: Why is petroleum also known as ‘black gold’?

Answer: Due to its great commercial importance, petroleum is also called ‘black gold’.

Question 14: How can petrol be used? Or Write two uses of petrol.

Answer: Petrol can be used as a motor fuel, aviation fuel and as solvent for dry cleaning.

Question 15: Can coal, petroleum and natural gas be prepared in the laboratory from dead organisms?

Answer: No. Their formation is a very slow process and conditions for their formation cannot be created in the laboratory.

Question 16: Name two places in India where petroleum is found. Or Where is petroleum found in the India?

Answer: In India, oil is found in Assam, Gujarat, Mumbai High and in the river basins of Godavari and Krishna.

Question 17: What are the products obtained on refining petroleum?

Answer: Petroleum gas, petrol, diesel, kerosene, paraffin wax, lubricating oil are obtained by refining petroleum.

Question 18: Why are coal and petroleum called fossil fuels?

Answer: Coal and petroleum are called fossil fuels because it required the dead organisms millions of years to get converted into these fuels.

Question 19: Name some places in India where natural gas has been found. Or Where do we find natural gas in India?

Answer: In India, natural gas is found in Tripura, Rajasthan, Maharashtra and in the Krishna Godavari delta.

Short Answer Type Questions

Question 1: How were fossils formed? Name two fossil fuels.

Answer: Fossil fuels were formed from the dead remains of living organisms millions of years ago. Coal, petroleum and natural gas are fossil fuels.

Question 2: What are the three zones of flame?

Answer: There are three different zones of a flame – innermost zone (dark zone), middle zone (luminous zone) and outer zone non-luminous zone.

Question 3: What is combustion? Give example.

Answer: A chemical process in which a substance reacts with oxygen to give off heat is called combustion. Example: Burning of charcoal.

Question 4: Why food is called fuel for our body?

Answer: Food is called fuel for our body because in our body food is broken down by reaction with oxygen and heat is produced.

Question 5: Why is the innermost zone of a flame black in colour?

Answer: The innermost zone of a flame is black in colour due to presence of unburnt vapours of the combustible material.

Question 6: Explain how CO 2 is able to control fires.

Answer: CO 2 , being heavier than oxygen, covers the fire like a blanket. Since the contact between the fuel and oxygen is cut off, the fire is controlled.

Question 7: Which is the best fire extinguisher for fires involving electrical equipment and inflammable materials like petrol?

Answer: For fires involving electrical equipment and inflammable materials like petrol, carbon dioxide (CO 2 ) is the best extinguisher.

Question 8: Why is water not used to control fires involving electrical equipment? Or Explain why fire caused by electricity should not be extinguished by pouring water? Or Why water is not suitable for extinguishing fire caused due to electrical appliances? Or Why can we not use water to extinguish fire caused due to electrical appliances?

Answer: Water is not used to control fires involving electrical equipment because water may conduct electricity and harm those trying to douse the fire.

Question 9: What are the harmful products released by the burning of fuels?

Answer: The harmful products released by the burning of fuels are unburnt carbon particles, carbon monoxide, carbon dioxide, sulphur dioxide, nitrogen oxides etc.

Question 10: What is rapid combustion? Give one example.

Answer: The combustion that takes place rapidly and produces heat and light is called rapid combustion. Example: Gas burns rapidly and produces heat and light.

Question 11: Why are fires produced by burning oil not extinguished by pouring water? Or Water is not suitable for fires involving oil and petrol. Explain. Or The fire produced by petrol cannot be extinguished by using water. Explain why?

Answer: Water is heavier than oil.  So, it sinks below the oil, and oil keeps burning on top. Thus, water is also not suitable for fires involving oil and petrol.

Question 12: What causes global warming?

Answer: Combustion of most fuels releases carbon dioxide in the environment. Increased concentration of carbon dioxide in the air is believed to cause global warming.

Question 13: What are the effects of global warming?

Answer: Global warming results in the melting of polar glaciers, which leads to a rise in the sea level, causing floods in the coastal areas. Low lying coastal areas may even be permanently submerged under water.

Question 14: What is combustible substance? Give some examples.

Answer: The substance that undergoes combustion is said to be combustible substance. Some of the combustible substances are wood, coal, charcoal, paper, dry leaves, petrol etc.

Question 15:  What is non-combustible substance? Give some examples.

Answer: The substance that does not burn is said to be non-combustible substance. Some of the non-combustible substances are soil, stone, glass, water etc.

Question 16:  Can you burn a piece of wood by bringing a lighted matchstick near it? Explain.

Answer: The ignition temperature of a piece of wood is high which cannot be reached by the small heat produced by a burning matchstick. So, a matchstick cannot light (or burn) a piece of wood directly.

Question 17:  How forest fires occur during the hottest summer days? Or Why do forest fires occur during hot summers?

Answer: During hot summers, sometimes the ignition temperature of dry grass in the forest is reached, which makes the dry grass catch fire. From grasses, it spreads to trees, and very soon the whole forest is on fire.

Long Answer Type Questions

Question 1: State some characteristics of petroleum.

Answer: Characteristics of petroleum

• It is a dark oily liquid.
• It has an unpleasant odour.
• It is a mixture of various constituents such as petroleum gas, petrol, diesel, lubricating oil, paraffin wax, etc.

Question 2: Explain the process of the formation of petroleum. Or How is natural gas formed?

Answer: Petroleum was formed from organisms living in the sea. As these organisms died, their bodies settled at the bottom of the sea and got covered with layers of sand and clay. Over millions of years, the absence of air, high temperature, and high pressure transformed the dead organisms into petroleum and natural gas.

Question 3: Write uses of coal tar.

Answer: Products obtained from coal tar are used as starting materials for manufacturing various substances used in everyday life and in industry, like synthetic dyes, drugs, explosives, perfumes, plastics, paints, photographic materials, roofing materials, etc. Interestingly, naphthalene balls used to repel moths and other insects are also obtained from coal tar.

Question 4: What are the uses of coal? Or State some uses of coal.

Answer: Uses of coal are as follows

• Coal is one of the fuels used to cook food.
• Earlier, it was used in railway engines to produce steam to run the engine.
• It is also used in thermal power plants to produce electricity.
• Coal is also used as a fuel in various industries.

Question 5: What are the advantages of using CNG and LPG as fuels?

Answer: The advantages of using CNG and LPG as fuels are:

• They can be transported easily through pipes.
• They can be used directly for burning in homes and factories where it can be supplied through pipes.
• They are clean fuels and do not give smoke when burnt.
• They are less polluting.

Question 6: State some of the tips of PCRA to conserve petrol and diesel. Or Give the tips advised by PCRA to save petrol/diesel while driving.

Answer: Their tips are:

• Drive at a constant and moderate speed as far as possible,
• Switch off the engine at traffic lights or at a place where you have to wait,
• Ensure correct tyre pressure, and
• Ensure regular maintenance of the vehicle.

Question 7: Describe how coal is formed from dead vegetation. What is this process called? Or Where do we get coal from and how is it formed?

Answer: About 300 million years ago the earth had dense forests in low lying wetland areas. Due to natural processes, like flooding, these forests got buried under the soil. As more soil deposited over them, they were compressed. The temperature also rose as they sank deeper and deeper. Under high pressure and high temperature, dead plants got slowly converted to coal. As coal contains mainly carbon, the slow process of conversion of dead vegetation into coal is called carbonisation.

Question 8: Distinguish between inexhaustible and exhaustible natural resources.

At Study Path, you can also learn more about Class 8 Science Chapter 5 Coal and Petroleum by accessing the free exhaustive list of study materials and resources related to the chapter such as NCERT Solutions, Notes, Important Questions, and MCQ.

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Complete Free JKBOSE Class 8th Science Solutions for students of Jammu and Kashmir. Below are the links to the solutions of all chapters of JKBOSE Class 8 Science.

Class 8th Science Solutions

• Microorganisms Friend and Foe.
• Coal and Petroleum.
• Conservation of Plants and Animals.
• Reproduction in Animals.
• Food Production and Management.
• Combustion and Flame.
• Chemical Effects of Electric Current.
• Force and Pressure.
• Reaching the age of Adolescence.
• Materials; Metals and Non-Metals.
• Pollution of Air & Water.
• Stars and the Solar System.
• Some Natural Phenomena.

Some Natural Phenomena Class 8 Question Answers

December 17, 2022 by Manjeet Leave a Comment

“Some Natural Phenomena” is Chapter 17 taken from the JKBOSE textbook of Science for students of Class 8th. In the previous post, I provided you with Questions and Answers for Chapter 16 The Cell. This post is about Some Natural Phenomena Class 8 Question Answers. Before we move on to solutions you must have your basics […]

The Cell Chapter 16 Class 8 Question Answers

December 17, 2022 by Manjeet 2 Comments

“The Cell” is Chapter 16 taken from the JKBOSE textbook of Science for students of Class 8th. In the previous post, I provided you with Questions and Answers for Chapter 15 Stars and the Solar System. This post is about The Cell Chapter 16 Class 8 Question Answers. Before we move on to solutions you […]

Stars and the Solar System Class 8 Question Answers

December 16, 2022 by Manjeet Leave a Comment

“Stars and the Solar System” is Chapter 15 taken from the JKBOSE textbook of Science for students of Class 8th. In the previous post, I provided you with Questions and Answers for Chapter 14 Friction. This post is about the Stars and the Solar System Class 8 Question Answers. Before we move on to solutions […]

Friction Chapter 14 Class 8 Question Answers

“Friction” is Chapter 14 taken from the JKBOSE textbook of Science for students of Class 8th. In the previous post, I provided you with Questions and Answers for Chapter 13 Pollution of Air and Water. This post is about the Friction Chapter 14 Class 8 Question Answers. Before we move on to solutions you must […]

Pollution of Air and Water Class 8 Question Answers

“Pollution of Air and Water” is Chapter 13 taken from the JKBOSE textbook of Science for students of Class 8th. In the previous post, I provided you with Questions and Answers for Chapter 12 Light. This post is about the Pollution of Air and Water Class 8 Question Answers. Before we move on to solutions […]

Case Study Questions Class 8 Science Reproduction in Animals

Case study questions class 8 science chapter 8 reproduction in animals.

CBSE Class 8 Case Study Questions Science Reproduction in Animals. Important Case Study Questions for Class 8 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Reproduction in Animals.

CBSE Case Study Questions Class 8 Science Reproduction in Animals

Case study 1.

  Que. 1) Reproduction is essential for the continuation of a ……………………………………………………………………………………………….. .

(b) Species

(a) Caterpillar

Que. 2) (a) Caterpillar

Que. 3) (d) Cow

Case study 2

Que. 1) Which of the following is NOT a part of the female reproductive system?

(a) in voluntary fertilisation

(b) inter vesicular fistula

Case study 3

Que. 1) The developing zygote called the embryo gets embedded in which part of the female reproductive system?

Que. 4) Define the term “metamorphosis”.

Que. 4) Answer: The transformation of larvae into an adult through drastic changes is called the process of metamorphosis.

Case study 4

Que. 4) Define the process of “asexual reproduction”.

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50 Top 8th Grade Science Fair Projects and Classroom Activities

Find interesting ideas to engage all learners!

Whether your students are preparing for the science fair or you’re looking for classroom ideas to grab their interest, we’ve got the answers! Find lots of 8th grade science fair projects across a spectrum of topics and difficulty levels (including plenty of easy science fair project ideas). Plus, check out fun classroom demos and hands-on experiments and activities your students will love.

To make it easier to find classroom activities or science fair projects for 8th graders, we’ve rated all the projects and activities by difficulty and the materials needed:

Difficulty:

• Easy: Low or no-prep experiments you can do pretty much anytime
• Medium: These take a little more setup or a longer time to complete
• Advanced: Experiments like these take a fairly big commitment of time or effort
• Basic: Simple items you probably already have around the house
• Medium: Items that you might not already have but are easy to get your hands on
• Advanced: These require specialized or more expensive supplies to complete

Biology and Life Science 8th Grade Science Fair Projects

Chemistry 8th grade science fair projects, physics and engineering 8th grade science fair projects, 8th grade science classroom demos, experiments, and hands-on activities.

Explore human behavior, plants and animals, the water cycle, and more with these 8th grade science fair project ideas.

Measure and compare lung capacity

Difficulty: Easy / Materials: Medium

This experiment combines math and biology to measure lung capacity using a balloon. There are a lot of interesting hypotheses students can form, document, and explore while taking these measurements.

Learn more: Measuring Lung Capacity at Blog She Wrote

Guide a growing plant through a maze

Difficulty: Medium / Materials: Basic

Prove that plants really do seek out the light by setting up a simple or complex maze. This is a simple 8th grade science project with really cool results.

Learn more: Plant Light Maze at KiwiCo

Explore symbiosis with nitrogen-fixing bacteria

Difficulty: Medium / Materials: Medium

Many plants depend on nitrogen for growth, but how important is it? This science project compares the growth of pea plants with and without nitrogen-fixing bacteria.

Learn more: Nitrogen and Plants at Education.com

Test water quality

A water-testing kit opens up limitless options for 8th grade science fair projects. Test the water quality of local streams, swimming pools, or even the taps at home.

Learn more: Water Quality Experiment at The Homeschool Scientist

Cast animal tracks

Explore wildlife biology by becoming an expert tracker! Learn to identify tracks and take casts. Turn this into an experiment by trying different methods to take casts, or use it as a method of identifying wildlife in the woods.

Learn more: Casting Animal Tracks at Blog She Wrote

Determine a plant’s favorite music

Play different types of music for plants, then observe and document any changes in the growth and development of the plants as they’re exposed to different genres of music.

Conduct fingerprint analysis

Budding forensic scientists will love this idea. Learn to dust for prints and try a technique called “fuming” for trickier surfaces. See if you can compare prints and make accurate matches in the classroom. You can buy a fingerprinting kit just for kids  or use supplies from around the house.

Learn more: Fingerprinting at Home Science Tools

Examine the connection between personality and memory

Do introverts have better memories than extroverts? This science project aims to find out. Round up some willing volunteers and administer the Myers-Briggs personality test, then challenge your subjects with a memory test. The results may or may not surprise you!

Learn more: Memory and Personality at Education.com

Measure algae growth

Fertilizer runoff has become a serious cause of water pollution. In this experiment, students will see its effects firsthand and brainstorm ways to keep it in check.

Learn more: Algae and Pollution Experiment at Layers of Learning

Water plants with different liquids

In this easy science fair project, kids water plants with different liquids, like rainwater, tap water, salt water, and even soda. They might be surprised at the results!

Learn more: Effecting Plant Growth at Calm the Chaos Parenting

Beakers and test tubes, pouring and mixing … do it all with these fun chemistry science fair project ideas for 8th graders.

Perform a starch test with iodine

This simple chemistry experiment uses iodine to determine the starch content of food items. Use the process to perform a variety of 8th grade science experiments related to food.

Learn more: Starch Test at Biology Notes for IGCSE

Keep your hands warm

If you live in a chilly part of the world, chances are you’ve seen chemical hand warmers for sale. In this 8th grade science fair project, use oxidation to make your own hand warmer, and find other creative ways to use this heating process.

Learn more: Homemade Hand Warmer at Steve Spangler Science

Compare electrolytes in sports drinks

Sports-loving kids will enjoy the chance to learn just how many valuable electrolytes their favorite sports drinks contain. Compare them with water or orange juice for a cool science fair project. You’ll need a few special supplies, like a multimeter and an ohm resistor , but they’re not too expensive and they’re easy to find.

Turn juice into spheres

You’ll need a few special supplies for this experiment , but the results are so cool. Turn spherification into a science fair project by experimenting with different beverages and liquids.

Block the sun’s UV rays

Use color-changing UV beads to test the protective power of medicine bottles, hats, clothing, and more. This is an easy 8th grade science fair project with nearly endless possibilities.

Grow a carbon sugar snake

Remember those little black pellets that fire up into long snakes on the 4th of July? This is the same concept but much bigger! The simple chemical reaction of sugar and baking soda makes it happen. Turn this into an 8th grade science fair project by varying the formula to create even bigger results!

Learn more: Carbon Sugar Snake at KiwiCo

Create a rainbow of flames

You can change the color of fire by adding chemicals found at your local grocery store—what a sight! How can you use these flame colors to determine the chemical content of other materials? Sounds like a cool 8th grade science fair project!

Get your laundry really clean

Find out if all those laundry detergent commercials are really telling the truth with this 8th grade science fair experiment. Test their cleaning power on a variety of stains and fabrics, and analyze your results.

Learn more: Science of Cleaning Products at Steve Spangler Science

Study the effects of acid rain

Difficulty: Easy / Materials: Basic

In this project, students use chalk as a stand-in for stone to learn how acid rain affects buildings, statues, and more. Turn this into a science fair project by exploring ways to mitigate the effects of the acidity.

Extract bismuth from Pepto Bismol

Difficulty: Advanced / Materials: Advanced

This is the kind of project that really makes you feel like a scientist. Grinding tablets with a mortar and pestle, filtering in beakers, heating over a Bunsen burner … this is what chemistry is all about!

Learn more: Extracting Bismuth at Popular Science

Optimize fermentation temperature

Delve into the mystery of how temperature affects the fermentation process and determine the optimum temperature for yeast development. (Test your hypothesis by baking a loaf of bread!)

Learn more: Hot Yeast at Elemental Blogging

Brew up some root beer

Who says science can’t be delicious ? Tinker with the basic root beer recipe to make it sweeter, fizzier, or better in any way you like!

Learn more: Root Beer Science at Steve Spangler Science

For those who love to build and tinker, try a science fair project that experiments with various physics concepts like energy, electricity, motion, and more.

Build a better light bulb

First, use the steps at the link to build a simple light bulb with a jar, some wire, and a 6-volt battery . Then, turn it into an 8th grade science fair project by tinkering with the various materials to make a light bulb that lasts longer, burns brighter, or is powered by an alternative source.

Learn more: Build a Light Bulb at 123 Homeschool 4 Me

Test the strength of interleaved paper

Paper seems smooth and slides apart easily, right? Not when you add friction into the mix! Mythbusters was amazed at how much strength it took to pull apart two interleaved phone books. Try this with smaller books for an 8th grade science fair project that people won’t believe!

Stand on a pile of paper cups

Combine physics and engineering and challenge 8th grade science students to create a paper cup structure that can support their weight. This is a cool project for aspiring architects.

Learn more: Paper Cup Stack at Science Sparks

Cook up a tasty treat with solar energy

Students can design and build a solar oven, and then use it to cook food to compare the cooking time and temperature with a conventional oven. See if you can improve on the original design by changing up the materials or construction.

Investigate advanced properties of liquids

Do surface tension and viscosity decrease with increasing temperature? Find out in this 8th grade science fair project.

Learn more: Surface Tension and Viscosity at Education.com

Make a solar desalinator

Clean freshwater is a valuable commodity. Construct solar-powered desalination devices with readily available materials, and find the most effective desalination methods.

Engineer a roller coaster loop

Kids may have created marble roller coasters before, but have they ever built one with a loop-the-loop? They’ll have to experiment to find out which initial height gives a marble the speed it needs to complete the journey.

Capture a picture of lightning

Difficulty: Advanced / Materials: Medium

Lichtenberg figures capture the branching path of electricity as it travels through an object. You can make your own in a variety of ways, including burning it into wood or acrylic.

Learn more: Lichtenberg Figures at Science Notes

Crash cars for science

This is a great class project for teachers, but it’s also excellent for an 8th grade science fair project. Build cars and crash-test them to learn the best methods of keeping passengers safe.

Learn more: STEM Car Crash Project at The Ardent Teacher

Discover the center of gravity

Once you find and maintain its center of gravity, almost any object will balance, even in surprising circumstances. Using this concept, what amazing objects can you balance and where?

Learn more: Center of Gravity at Rookie Parenting

Power up homemade batteries

Building batteries is a classic science experiment for any age. Make it into an 8th grade science fair project by trying different variables and exploring the amount of power you can produce.

Learn more: DIY Batteries at 123 Homeschool 4 Me

Assemble a spring balance scale

Apply Hooke’s law to find out if the stretching of a spring can be used to accurately measure the weight of objects. The materials are simple, but you’ll need patience and physics to calibrate a spring and use it to test weights.

Design a robotic hand

This is a project that can be tweaked by coming up with ways to improve upon the design. Can you build a hand that can pick up a ball? How about one that can pluck up a piece of string? So many possibilities!

Learn more: DIY Model Robot Hand STEM Activity at Mombrite

Build an infinity mirror

Experiment with optical illusions by creating a tunnel of lights that seems to stretch away into infinity. Eighth grade science students will learn about engineering and the physics of optics along the way.

Construct a Rube Goldberg machine

Create a machine to complete a simple task in the most complicated fashion! This is a neat 8th grade STEM fair project because it allows you to use a variety of physics concepts in a fun way.

Explore a wide variety of 8th grade science concepts with these fun and engaging activities.

Protect an egg in a crash

We love this spin on the classic egg-drop project. In this version, students build a structure to protect an egg during a collision with a wall, making the connection between crash tests and physics concepts.

Drop an egg to prove the first law of motion

This experiment looks like a magic trick, but it’s firmly grounded in Newton’s first law of motion. When you knock the pie tin out of the way, the egg falls straight into the glass thanks to inertia. (Worried about making a mess? Use plastic eggs instead.)

Learn more: Egg Drop Inertia Challenge at Steve Spangler Science

Break out the leaf blower to teach Bernoulli’s principle

Eighth grade science students have probably seen a Bernoulli demo or two, often with straws and Ping-Pong balls. So grab their attention by trying it with a leaf blower and a beach ball instead!

Assemble a Newton’s cradle

Newton’s cradle is a fascinating way of demonstrating momentum and energy transfer. Follow the directions at the link to build one, or challenge 8th grade science students to experiment with their own construction methods.

Learn more: Newton’s Cradle at Babble Dabble Do

Extinguish a candle without blowing it out

Combine an acid/base experiment with some fire science in this really popular classroom science demo. It seems like magic, but it’s just science!

Relight a candle without touching it

Tell students you’re going to relight a candle without touching the flame to the wick. The results will boggle their minds!

Learn more: Magic Traveling Flame at Steve Spangler Science

Demonstrate the “unpoppable” balloon

Your students won’t believe you when you say you can hold a balloon up to a flame without popping it. Use the conductivity of water to prove your point.

Extract your own DNA

DNA is the blueprint of life, and you’ll be surprised at how easy it is to extract your own with a few simple supplies. Preserve it in alcohol in the freezer when you’re done.

Learn more: How To Extract DNA at Home at Home Science Tools

Build a trash can air cannon

This is such a fun way to demonstrate an air vortex! It takes a little effort to build the air cannon, but you can use it year after year for amazing 8th grade science demos.

Separate water into hydrogen and oxygen

Use electrolysis to prove that water really is made up of hydrogen and oxygen. It’s a simple concept but one that never fails to amaze.

Learn more: Separating Water at Navigating by Joy

Assemble a ring of Pringles

Everybody loves an edible STEM challenge! Here’s one that seems simple but takes some time to work out: Build a ring of Pringles chips without using any other materials.

Construct a cup holder

Can your 8th grade science students build a device to stabilize and carry two cups of water, using only a few simple supplies? Oh, and can they manage it in just 5 minutes? This timed challenge pushes their creative engineering limits!

Learn more: Cup Holder STEM Challenge at Homeschool Creations

Navigate a light maze

Here’s the STEM challenge: Bounce a beam of light around a corner past an obstacle. Increase the difficulty by adding more obstacles and variables.

Engage your 8th grade science students further with these 24 Science Kits for Middle and High School That Make Hands-On Lessons Easy .

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Application requirements & enhancements.

Our admission counselors review each application carefully, taking into consideration your academic background, life experiences and interests. We don’t have a minimum test score or GPA range to gauge your potential for admission, but there are some things that can make you a stronger candidate.

Required for admission consideration

We look for students who have been successful in a variety of challenging courses, especially those that are above and beyond what’s required for graduation. And we understand every school is different, so we evaluate your transcript specifically against your high school's curriculum.

Prior to high school graduation, we require you to complete a minimum of:

• English: 4 years
• Math: 3 years
• Science: 3 years (2 must be laboratory science)
• Social studies: 3 years
• Foreign language: 2 years

If you're interested in engineering or the sciences, we recommend an additional year of math and laboratory science. Leaning more toward the liberal arts? We’d suggest another year of social studies and foreign language.

Application essay

All first-year students must complete an essay via the Common App or Coalition with Scoir. What you share in your essay is completely up to you—it should be about conveying who you are to the admission staff. No matter the topic, personalize it. Add a part of you into the piece, and make it genuine.

Arts Supplement Required for music majors and those who are pursing a Arts Achievement Scholarship in either music or art studio

Applicants who are required to submit an Arts Supplement will see this required checklist item on their applicant status portal. Students must upload their portfolio materials using the portfolio updater prior to completing the Arts Supplement. You can access the portfolio uploader by logging into your applicant portal using your CWRU Network ID and clicking Edit Portfolio.

The Arts Supplement is optional for all other applicants. (More on that below.)

Opportunities to enhance your application

We understand there may be more you want to share with us than can fit neatly on the Common App or Coalition with Scoir. Though not required as part of their application, some students choose to share additional information that may possibly strengthen their application and help us get to know them better. We welcome you to share such information with us.

Optional ways to enhance your application include the following:

Test-optional policy

Case Western Reserve University is test-optional.  Read about our test-optional policy .

We “superscore” our students’ test results, which means we take your best scores on each section of the SAT and ACT. If you took a test more than once, you will be evaluated on the highest score you received in each individual section of the exam.

Here’s a look at admitted student statistics for the Class of 2025:

Middle 50% 

• SAT Total: 1420-1510
• ACT Composite: 32-35
• Unweighted GPA: 3.6–4.0
• Test optional: 42%

Ordinarily, scores for standardized tests taken in November of your senior year arrive in time for Early Action or Early Decision I deadlines, and scores for tests taken in January arrive in time for Early Decision II or Regular Decision consideration.

To ensure your application can be fully reviewed in time for your chosen decision plan, you should take tests by the following dates:

• Nov. 30 : Early Action, Early Decision I and Pre-Professional Scholars Program applicants
• Dec. 31 : Early Decision II and Regular Decision applicants

Share your talents

Arts Supplements are required for music and music education majors and available to all applicants. If you intend to submit an arts supplement, be sure to indicate this on your application.

The arts supplement is due 15 days after the application deadline and can be completed via your applicant portal .  For detailed information:

Scholarship Audition and Portfolio Requirements

• Prepare two contrasting monologues, one Shakespeare and one contemporary, not to exceed a total time of four minutes. You may also prepare 16 bars of any song, but this is not required. If possible, please present a headshot and resume at the audition.

A portfolio presentation is needed for the directing concentration. Your portfolio should consist of the following:

• A one-page resume documenting your theater experience (directing, acting, playwriting, design, stage management, etc.).
• A one- to two- page director’s concept for a published play or musical that you would be interested in directing, detailing your vision for the show (characters, moods and tones, visual aspects) in addition to what you would want the audience to take away from the production in terms of its central themes and ideas.
• Production photos from previous projects you have directed (if applicable, not required).
• You should be prepared to speak about your interest and passion for directing as well as your previous directing and/or theater experience.

Dramatic Writing/Playwriting

• Submit a 20-page sample of your work in either playwriting or screenwriting (or both) at least one week before the interview date. This can include either an excerpt from a full-length work or a combination of shorter pieces, such as 10-minute plays or short-film scripts. While dramatic writing is preferred, you may also submit other examples of your creative writing, such as short stories, poetry, essays, etc.

Stage Management

• Bring your stage management binders, copies of scripts you have worked on (with cues written in), paperwork related to the show, and any other evidence of skills related to stage management such as organization, managing/coordinating large groups of people, multitasking and communication.
• A one-page resume of experience in theater is required. You may also include experience in a related field, such as art, architecture, graphics or photography. Additionally, a statement of intent—even if that statement is exploratory—should be provided. Other materials may include a portfolio demonstrating skills in theater (renderings, sketches, paperwork, scale drawings, production photos, etc.) and related areas (artwork, photography, drawing, drafting, computer graphics, etc.). The portfolio may be in scrapbook format. Art projects or model-making could substitute or be included with the other requirements. The material should be organized into some kind of cohesive presentation, with identifying labels for references. The interviewer will retain a copy of your resume but will not keep your portfolio. Portfolio is for presentation purposes only.
• Submit a video and complete an online questionnaire for pre-screening by dance department faculty. The video submission should be 90 seconds to three minutes in length, and you should be clearly visible. Do not submit ensemble footage. Video may be from technique class or performance.
• Submit a portfolio PowerPoint consisting of 24 pieces of your work. Each image credit line should include the name of the piece, the dimensions, the material, media and the date completed. (For example: Self-Portrait, 18” x 24”, media soft pastel on paper, fall 2021.) If you are showing three-dimensional work, i.e. sculpture or pottery, you may want to show two different views, front and side, etc. You may also want to choose to photograph a specific detail.
• Autobiography : A short (250-word) essay, citing your course of study in the visual arts. Include any special out-of-school activities, i.e., art camp, working as a teaching assistant doing creative activities, or private art lessons. Describe both your junior high and high school art experiences, courses that you took, and subjects that you studied.
• Program of study : A separate, short (250-word) essay of what you hope to gain participating in our program in Art History and Art. You may want to consult the Art History and Art website for courses that are available for you to take.

Tell us more about yourself

Additional materials can be shared through a form on your applicant portal. You can use this opportunity to share videos, web links, PDFs, documents, photos and more.

Some students use this as an opportunity to add additional context to their application with materials like:

• Additional letters of recommendation
• Research abstracts
• ACT writing tests
• Schoolhouse.world tutor transcripts
• Predicted IB results
• Though not all may be eligible for college credit at CWRU, these test scores can still enhance your application. You can send scores directly to us or self-report them via your portal.

Anything you have that can help us know you better and understand the contributions you can make to our campus are welcome and appreciated.  

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Case Study Questions for Class 8 Science Chapter 6 Combustion and Flame

• Last modified on: 11 months ago
• Reading Time: 4 Minutes

Here we are providing case study questions for CBSE Class 8 Science Chapter 6 Combustion and Flame.

Case Study Questions

Question 1:

Read the passage carefully and attempt the questions given below.

A chemical process in which a substance reacts with oxygen to give off heat is called combustion. The substance that undergoes combustion is said to be combustible. It is also called a fuel. The fuel may be solid, liquid or gas. Sometimes, light is also given off during combustion, either as a flame or as a glow. The lowest temperature at which a substance catches fire is called its ignition temperature. The substances which have very low ignition temperature and can easily catch fire with a flame are called inflammable substances. Examples of inflammable substances are petrol, alcohol, Liquefied Petroleum Gas (LPG)

i) What are combustible substance? a) Substance that undergoes combustion b) Substance reacts with ozone c)Substance that glows d) All of these

ii) Fuels can be : a) Solids only b) Liquids only c) Gases only d) All of these

iii) What is ignition temperature? a) Lowest temperature at which a substance catches fire. b) Temperature when water boils c) Temperature at which ice is formed d) Temperature of LPG.

iv) Identify the inflammable substance from the following. a) Soil b) Water c) Alcohol d) Vinegar

v) What are inflammable substances? a) Substances with low ignition temperature b) Substances which catches fire easily with a flame c) Only option a d) Both a and b

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