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Chapter 4 Class 7 - Heat

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In chapter 4 of class 7 , you are going to understand the concept of ‘ Heat’. Teachoo is your one stop solution for everything science starting from concepts, NCERT questions along with extra questions prepared by experts which will help you understand the chapter easily.

You will start by learning about what heat is and how it is measured .  You will get to know that heat is measured using a device known as ‘ thermometer’ and there are various types of it such as -

• Laboratory Thermometer - Used in labs
• Clinical Thermometer - Used by doctors to measure human temperature

After this, you will learn about the phenomenon of ‘ transfer of heat’. This will teach you how heat is transferred from one surface to another. 

For Example - When you put a pan on a gas flame, the pan becomes hot.

You will also learn about the processes through which heat can be transferred.

These processes are -

At last, you will relate this chapter with chapter 3 of class 7 and get to know about the clothing materials which keep us warm or cool.

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NCERT Solutions for Class 7 Science Chapter 4 Heat

NCERT Solutions for CBSE Class 7 Science Chapter 4 Heat are given below. These solutions help students to clear their doubts and to obtain good marks in final exam. Class 7 Science NCERT questions and answers provided in this article are strictly based on the CBSE syllabus and curriculum.

Class 7 Science Chapter 4 Heat NCERT Solutions

Class 7 NCERT Solutions for Science Chapter 4 includes all the intext and exercise questions. All these questions are solved by experts with a detailed explanation that will help students complete their assignments and homework.

Question 1: State similarities and differences between the laboratory thermometer and the clinical thermometer.

Answer: Similarities:

• Working principle of both the thermometer is same.
• Both are used to measure temperature.
• Both have a thick walled glass tube enclosing a fine uniform bore capillary tube.
• Mercury is used in both thermometers to measure temperature.
• Both have Celsius and Fahrenheit markings.

Differences:

• Laboratory thermometer is used to measure temperature of different objects in factories and laboratory where as clinical thermometer is used to measure the temperature of human beings only.
• Generally, laboratory thermometer has temperature range from −10℃ to 110℃ whereas clinical thermometer has temperature range from 35℃ to 42℃.
• Usually laboratory thermometer does not have any constriction whereas clinical thermometer has the small constriction near the mercury bulb.
• Laboratory thermometer has to be kept upright while taking the reading whereas clinical thermometer can be tilted while taking reading.

Differences

Question 2: Give two examples each of conductors and insulators of heat.

Answer: Two examples of conductors of heat are: (i) Aluminium (ii) Iron

Two examples of insulators of heat are: (i) Wood (ii) Plastic

Question 3: Fill in the blanks:

(a) The hotness of an object is determined by its __________.

(b) Temperature of boiling water cannot be measured by a _____________ thermometer.

(c) Temperature is measured in degree ______________.

(d) No medium is required for transfer of heat by the process of __________.

(e) A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the process of ______________.

(f) Clothes of ______________ colours absorb more heat better than clothes of light colours.

Answer: (a) The hotness of an object is determined by its  temperature .

(b) Temperature of boiling water cannot be measured by a  clinical  thermometer.

(c) Temperature is measured in degree  Celcius .

(d) No medium is required for transfer of heat by the process of  radiation .

(e) A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the process of  conduction .

(f) Clothes of  dark  colours absorb more heat better than clothes of light colours.

Question 4: Match the following:

Question 5: Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.

Answer: More layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing because air gets trapped in-between layer. As air is a bad conductor of heat it does not allow the escape of the heat from the body.

Question 6: Look at Fig. 4.13. Mark where the heat is being transferred by conduction, by convection and by radiation.

Question 7: In places of hot climate it is advised that the outer walls of houses be painted white. Explain.

Answer: In places of hot climate, it is advised to paint the outer walls of houses as white because a light colour such as white reflects back most of the heat that falls on it. Hence, a light colour tends to keep the house cool.

Question 8: One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture will be

(a) 80°C  (b) more than 50°C but less than 80°C (c) 20°C (d) between 30°C and 50°C

Answer: (d) between 30°C and 50°C

Question 9: An iron ball at 40°C is dropped in a mug containing water at 40°C. The heat will

(a) flow from iron ball to water. (b) not flow from iron ball to water or from water to iron ball. (c) flow from water to iron ball. (d) increase the temperature of both.

Answer: (b) not flow from iron ball to water or from water to iron ball.

Question 10: A wooden spoon is dipped in a cup of ice cream. Its other end

(a) becomes cold by the process of conduction. (b) becomes cold by the process of convection. (c) becomes cold by the process of radiation. (d) does not become cold.

Answer: (d) does not become cold.

Question 11: Stainless steel pans are usually provided with copper bottoms. The reason for this could be that

(a) copper bottom makes the pan more durable. (b) such pans appear colourful. (c) copper is a better conductor of heat than the stainless steel. (d) copper is easier to clean than the stainless steel.

Answer: (c) copper is a better conductor of heat than the stainless steel.

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• Class 7 Notes CBSE Science Chapter 4- Heat (Free PDF Download)
• Revision Notes

Revision Notes for CBSE Class 7 Science Chapter 4 - Free PDF Download

Science is one of the important subjects in class 7 which requires students to learn each and every chapter with the utmost attention. By referring to the Class 7 Science Chapter 4 Notes students can get to know of all the little and big things about heat, how it is conducted, process of heat transfer including radiation and convection etc. Class 7 Science Chapter 4 Notes by Vedantu include solutions to some questions also which students have to answer at the end of the chapter. To revise the complete chapter students can opt for downloading Class 7 Science Chapter 4 Notes PDF free of cost. Students can also download NCERT Solution PDF for all subjects to prepare for their forthcoming exams. Maths Students who are looking for the better solutions ,they can download Maths NCERT Solutions Class 7 to help you to revise complete syllabus and score more marks in your examinations.

Download CBSE Class 7 Science Revision Notes 2024-25 PDF

Also, check CBSE Class 7 Science revision notes for other chapters:

Access Class 7 Science-Chapter 4 - Heat

We know that many things around us can be hot or cold, like tea or boiling water is hot, and ice or ice cream is cold. 

This is not just a sensation but a form of energy called heat energy. Heat can be termed as an energy which makes you feel hot or warm or we can say scientifically that it is a form of energy where the transfer of energy from a hot to a cooler object takes place. 

The differentiation of hot and cold comes from the difference in their temperatures. Hence temperature is a measure of the degree of hotness of an object. 

Measuring Temperature:

The device that measures the temperature is known as a thermometer. There are various kinds of thermometers depending on the purpose or usage of the same. 

The various kinds of thermometers are as follows:

Clinical Thermometer:

This type of thermometer is used to measure the body temperature only and is used in hospitals by doctors and also at home. 

A clinical thermometer generally consists of a long narrow glass tube with a bulb at one end that contains mercury. A thread of shining mercury is seen along the scale indicated on the thermometer, which helps in taking the reading. 

The scale used in India is the Celsius scale and is indicated by the symbol ${}^{\circ}C$. 

The normal human body temperature is ${37}^{\circ}C$, and so the range of this thermometer is from ${35}^{\circ}C$ to ${42}^{\circ}C$. To take the reading, the bulb of the thermometer is kept below the tongue for a minute. 

Nowadays due to the toxic nature of mercury and issues of the thermometer being broken and spilling it, digital thermometers are in use which are safe and do not contain mercury. 

Maximum-Minimum Thermometers:

These are used to measure the maximum and minimum temperatures of a day.

They are U-shaped parallel glass tubes. It is used to record the temperatures at a place. 

Laboratory Thermometer: 

This thermometer is used to measure the temperature of all objects other than a human body. 

It consists of a long glass tube without a kink and has a bulb containing mercury at the end of the tube. 

This is generally used in laboratories for checking the boiling points, freezing points etc. Hence the range of this thermometer is from $-{10}^{\circ}C$ to ${110}^{\circ}C$.

Transfer of Heat:

We know that heat is the transfer of energy from a hotter object to a cooler object, like if a spoon is left in a bowl of hot soup, then the heat from the soup is transferred to the spoon and it becomes hot. 

This transfer of heat can occur in different ways. They are:

Conduction:

This is a process of heat transfer where the heat is transferred from the hot part to the cold part of the object. Example - The handle of a pan gets hot when the pan becomes hot and so a wooden or plastic handle is made for them. 

The substances that allow the heat to pass through them are termed as conductors. Example - iron, copper, etc. 

The substances that do not allow the heat to transfer through them are called insulators or poor conductors. Example - wood, plastic.

Convection:

This  is the form of heat transfer in liquids and gases where the heat is transferred by the movement of the heated molecules within them. Example - boiling of water. 

The molecules of the fluid or gas near the source of heat become hot and rise up and this is replaced by the colder molecules in the fluid or air. They also get heated up and rise till the entire fluid or air is heated. 

This is the principle behind the interesting feature in the coastal areas called the sea and land breeze.

Sea Breeze: 

In the coastal regions, the land gets heated up faster during the day time. And as the land gets hotter, the hot air rises up. 

At that time the cool air from the sea blows in to take its place and the warm air from the land moves to the sea to complete the cycle. This cool breeze flowing from the sea to the land is termed as the sea breeze. 

Land Breeze: 

The opposite of this happens at night. The land cools faster than the water at night, so the cool air moves towards the sea to replace the warm air of the sea. 

The cool air moving from the land towards the sea is termed as land breeze. 

Radiation: 

This is the form of heat transfer where a medium like air or liquid is not required to transfer the heat energy. Example - Heat from the sun, a hot utensil becomes cool after some time by transfer of heat to surroundings this way. 

All the hot bodies are capable of radiating heat.

Absorption of Heat:

The heat that is radiated  by the objects is reflected, absorbed. 

The heat increases the temperature of the object. 

Dark-colours are capable of absorbing heat. So, we feel comfortable wearing them in winters and we use a black umbrella to go out in the sun. 

Light colours reflect heat and so we feel comfortable wearing them in summers. 

We use woollen clothes in winters. Though wool is a poor conductor of heat, it can trap air (again a bad conductor of heat) in between the fibres which does not allow the heat from the body to escape into the surroundings and thus keeping us warm.

Highlights of Chapter 4 Science Class 7 Note

Temperature Breeze

Students can know more about the above topics in CBSE Class 7 Science Chapter 4 Heat Notes.

How Different Colours Absorb Different Amounts of Heat?

In Heat Chapter Class 7 Ncert Notes, absorption of different colours by varied amounts of heat has been demonstrated. This is one of the first activities of the chapter. Below are the steps mentioned to conduct this activity:

Arrange two tin cans of the same size.

Paint both the cans in two different colours, preferably black and white.

Now as mentioned in class 7 Chapter 4 Science Notes, the cans should be filled with an equal volume of water.

Leave the cans in the mid-noon sun for about an hour. Follow the precise instructions in Heat and Its Effects Class 7 Notes.

Measure the temperature of the water in the cans after half an hour.

After this, you may find that the water in the black can is comparatively hotter than the water in the white can.

Production of Biogas in Biogas Plant

Biogas can be produced in a biogas plant from raw materials like municipal waste, sewage, agricultural waste, plant waste, and food waste or green waste. It primarily consists of carbon dioxide and methane.

Four elements that are essential for the formation of biogas, as per the Class 7 Science Ch 4 Notes, are:

Carbon dioxide

Hydrogen sulphide

Water vapour

What is the Difference Between Heat and Temperature?

As mentioned in NCERT Class 7 Science Heat Notes, heat has been referred to as the energy stored inside an object whereas the temperature is the measurement of hot and coldness of an object. The heat of an object is dependent upon the mass, temperature, material whereas the temperature of an object depends upon the kinetic energy of its particles and molecules.

What do You Understand by Radiation?

The process through which we get heat energy from the sun is known as radiation. It can travel through space and hence does not require a medium for transmission. Students can learn more about radiation through heat And Temperature Class 7 Notes. Also, radiation is always in the form of electromagnetic energy waves that travel like radio and light waves.

What are the Disadvantages of the Celsius Scale Mentioned in Class 7th Science Chapter 4 Notes?

In the Celsius scale, there may be a temperature below zero degree Celsius. Besides, the volume of gases and pressure of gases do not alter or change in proportion to Celsius temperature.

Benefits of Revision Notes for CBSE Class 7 Science Chapter 4 - Free PDF Download

The benefits of revision notes for CBSE Class 7 Science Chapter 4 - Heat, available for free PDF download, are numerous and invaluable for students. Some of the key advantages include:

Concise and Organised: Revision notes provide a condensed and well-organised summary of the chapter's key concepts, making it easier for students to revise and retain information.

Quick Review: With revision notes, students can quickly review the important points and refresh their memory before exams or assessments.

Time-Saving: As the notes are compact and to the point, they save time during revision, allowing students to cover more topics effectively.

Clarity and Understanding: These notes help students clarify their understanding of complex topics, enabling them to grasp the subject matter more effectively.

Enhanced Recall: The summarised format aids in better recall of information, improving the chances of retaining the material for a longer duration.

Exam Focus: Revision notes are designed to focus on the most relevant and frequently asked questions in exams, ensuring students prioritize their preparation accordingly.

Confidence Booster: By using well-prepared and comprehensive revision notes, students gain confidence in their knowledge and are better prepared to face exams with self-assurance.

Supplementary Learning: The notes serve as an excellent supplement to the regular classroom learning, reinforcing the concepts taught in class.

Accessibility: Free PDF download of the revision notes makes them easily accessible, allowing students to revise on various devices and at their convenience.

Revision Anytime: Students can revise the chapter at any time, even when they are on the move, making learning more flexible and adaptable to their schedule.

The free PDF download of Class 7 CBSE Science Chapter 4 - Heat notes offers an exceptional learning resource for students. These comprehensive notes cover the fundamental concepts of heat, thermal expansion, and heat transfer in a concise and organised manner. The availability of these notes in PDF format allows for easy access and convenient revision, empowering students to strengthen their understanding of the chapter. By utilising these well-structured notes, students can save time during revision while enhancing their grasp of the subject. Overall, the Class 7 Heat notes serve as an invaluable tool for students to consolidate their knowledge and excel in their academic pursuits.

FAQs on Class 7 Notes CBSE Science Chapter 4- Heat (Free PDF Download)

1. Define Laboratory Thermometer.

The laboratory thermometer is the thermometer that is used for measuring the temperature of all objects other than our body. This form of thermometer has a column of mercury that is enclosed in a continuous glass casing. It is mentioned in notes of Class 7 Science Chapter 4 that this temperature is from -10 degree centigrade to 110-degree centigrade.

2. What is the Sea Breeze?

Lands heat up faster than the sea during day time. After it heats up, the warm air from the land moves up and cold air from the sea takes its place. Lastly, in order to complete the cycle the warm air move towards the sea level which creates a sea breeze from the sea to the land.

3. Where can I Download Class 7 Science Chapter 4 Notes?

If you are looking for science Class 7 Chapter 4 Notes then there is no better option than choosing Vedantu, one of the best online tutorials. Besides chapter 4 Heat Class 7 Science Notes, Vedantu also provides notes for all other subjects for Class 7 students. If you are wondering why you should make Vedantu your preferred choice, then here are a few reasons:

It helps in faster revision.

It is the best comprehensive guide that students can ask for.

Students also get easy access to the notes as they can download it in PDF format.

Detailed notes on Science Chapter 4 Class 7 about the chapter can be availed from the site.

They maintain the standard explanation along with providing easy techniques to remember the concept and the topics.

4. What are the effects of heat Class 7?

The effects of heat are:

When water is heated, its temperature rises and it begins to boil. It causes the temperature to change. This boiling of water is a consequence of heat which causes rise in temperature.

Steam is developed, i.e., its liquid form converts to its gaseous state, when water is heated to a high temperature.

When water is heated, part of it overflows owing to expansion, or volume growth. It causes Expansion.

5. What is heat?

Heat is the energy transmitted from one object to another as a consequence of a temperature differential. We can feel heat with the rise of temperature. When two bodies of differing temperatures come into contact, energy is transferred—that is, heat flows—from the hotter to the colder. The consequence of this transfer of energy is typically, but not always, a rise in the colder body's temperature and a reduction in the hotter body's temperature. To revise these concepts, download the NCERT notes for Class 7 science free of cost from the vedantu website (vedantu.com).

6. What is a heat insulator in Class 7 Chapter 4?

The decrease of heat transmission between objects in thermal contact or within the region of radiative effect is known as thermal insulation. Using carefully developed procedures or processes, as well as appropriate object forms and materials, thermal insulation can be produced. Any material that has these properties to decrease heat transfer is known as a heat insulator. These are widely used daily and can be found in many commonly used appliances. 

7. What is a Laboratory Thermometer?

This thermometer is used to measure the temperature of anything that isn't a human body. It is made out of a long glass tube with no kinks and a bulb containing mercury at the end. This is commonly used in laboratories to examine boiling and freezing temperatures, among other things. It is bigger in size than the normal thermometer. As a result, the temperature range of this thermometer is 10 to 110 degrees Celsius.

8. What is conduction?

This is a heat transfer process in which heat is transported from a hot section of an item to a cool component of the object. For example, when a skillet becomes hot, the handle gets hot, thus a wooden or plastic handle is built for it. Conductors are materials that allow heat to travel through them. Iron, copper, and other metals are examples. Insulators or poor conductors are substances that do not enable heat to pass through them. Wood and plastic are two examples. For more information and revision notes students can download the Vedantu app.

Class 7 Science Revision Notes

Ncert solutions.

• NCERT Solutions
• NCERT Class 7
• NCERT Class 7 Science
• Chapter 4: Heat

NCERT Solutions For Class 7 Science Chapter 4 Heat

Ncert solutions for class 7 science chapter 4 – free pdf download.

* According to the CBSE Syllabus 2023-24, this chapter has been renumbered as Chapter 3.

NCERT Solutions Class 7 Science Chapter 4  Heat is provided below to help students of Class 7 understand the concepts of Heat interactively. The NCERT Solutions for Class 7 Science is one of the most crucial resources to refer to excel in Class 7 Science. Heat is a fundamental topic that is necessary for the students to understand to score well in the exams, and to face bigger challenges in the future.

Download Exclusively Curated Chapter Notes for Class 7 Science Chapter – 4 Heat

Download most important questions for class 7 science chapter – 4 heat.

The NCERT Solutions for Class 7 Science is developed by an expert faculty team at BYJU’S according to the latest CBSE syllabus and guidelines. These solutions can come in handy during revisions and doubt clearances. Students can access the Science NCERT Solutions for Class 7 of this chapter from the link enclosed below.

Download PDF of NCERT Solutions for Class 7 Science Chapter 4 – Heat

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Access Answers to NCERT Solutions for Class 7 Science Chapter 4 – Heat

Exercise Questions

1. State similarities and differences between the laboratory thermometer and the clinical thermometer.

Similarities

• Both are made of glass and consist of a long narrow glass tube
• At one end both of them have a bulb
• Bulbs of both the thermometers consist of mercury
• Celsius scale is present in both the thermometers

Differences

2. Give two examples each of conductors and insulators of heat.

Conductors: Iron and copper

Insulators: Plastic and wood

3. Fill in the blanks :

(a) The hotness of an object is determined by its __________.

(b) Temperature of boiling water cannot be measured by a _____________ thermometer.

(c) Temperature is measured in degree ______________.

(d) No medium is required for transfer of heat by the process of __________.

(e) A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the process of ______________.

(f ) Clothes of ______________ colours absorb heat better than clothes of light colours.

(a) The hotness of an object is determined by its temperature .

(b) Temperature of boiling water cannot be measured by a clinical thermometer.

(c) Temperature is measured in degree Celcius .

(d) No medium is required for transfer of heat by the process of radiation .

(e) A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the process of conduction .

(f ) Clothes of dark colours absorb heat better than clothes of light colours.

4. Match the following: 

5. Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.

More layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing because air gets trapped in between the layers. As air is a bad conductor of heat it does not allow the heat to escape from the body.

6. Look at Fig. 4.13. Mark where the heat is being transferred by conduction, by convection and by radiation.

7. In places of hot climate it is advised that the outer walls of houses be painted white. Explain.

In places of hot climate, it is advised that the outer walls of houses be painted white because white colour reflects back most of the heat that is incident on it, as white is a poor absorber of heat. This helps in keeping the house cool.

8. One litre of water at 30°C is mixed with one litre of water at 50°C. The temperature of the mixture will be

(a) 80°C (b) more than 50°C but less than 80°C (c) 20°C (d) between 30°C and 50°C

The temperature of the mixture will be between 30°C and 50°C because hot water loses heat and simultaneously cold water gains heat. This keeps the temperature in between 30°C and 50°C.

9. An iron ball at 40°C is dropped in a mug containing water at 40°C. The heat will

(a) flow from the iron ball to water.

(b) not flow from the iron ball to water or from water to the iron ball.

(c) flow from water to the iron ball.

(d) increase the temperature of both.

Answer is (b) not flow from the iron ball to water or from water to the iron ball because both of them have the same temperature of 40°C.

10. A wooden spoon is dipped in a cup of ice cream. Its other end

(a) becomes cold by the process of conduction.

(b) becomes cold by the process of convection.

(c) becomes cold by the process of radiation.

(d) does not become cold.

The answer is (d) does not become cold because wood is a bad conductor of heat.

11. Stainless steel pans are usually provided with copper bottoms. The reason for this could be that

(a) copper bottom makes the pan more durable.

(b) such pans appear colourful.

(c) copper is a better conductor of heat than stainless steel.

(d) copper is easier to clean than stainless steel.

The answer is (c) copper is a better conductor of heat than stainless steel.

NCERT Solutions for Class 7 Science Chapter 4 Heat (Introduction)

This chapter focuses on questions regarding heat and measurement of heat. We will see questions on the difference between clinical and laboratory thermometers. We will analyse the  difference between heat and temperature by solving various questions given in this chapter. We will be seeing questions on conductors and insulators and their examples. We also have fill in the blanks questions where you have to fill the appropriate words to make the sentences meaningful. This chapter consists of numerous types of questions for easier understanding. Students can refer to the NCERT Solutions for Class 7 to learn more in detail.

Important topics covered in NCERT Solutions for Class 7 Chapter 4 Heat

• Hot and cold
• Temperature measurement
• Thermometers
• Heat transfer
• Clothes in  different climatic conditions

Students can utilise the NCERT Solutions for Class 7 Science Chapter 4 for quick references to comprehend these and other complex topics.

In  NCERT books , you can find extra questions for Class 7 Science after the end of each chapter. BYJU’S experts provide answers to NCERT exemplar problems, which will help you understand the topic effectively, and further help to crack the competitive exams. Also, NCERT Solutions are available for Classes 1 to 12 for all subjects.

We have a match the following type questions (MCQs) which will enable you to correctly match the answers to the right statements. Have you wondered why wearing multiple layers of clothes in winter makes you stay warm? Find out the answers here in the NCERT Solutions . You will be given an image where you have to mark the places where conduction, convection and radiation happen.

Do you know why the buildings in hotter climate are painted white on the outside? Do you want to know the answer to that question? Find out here. What will happen when you mix two liquids having different temperatures, what will happen to the temperature of the mixture? Find out here. You will be facing questions like these, and practising them will help you get well acquainted with the entire chapter.

Frequently Asked Questions on NCERT Solutions for Class 7 Science Chapter 4

What are the similarities between laboratory and clinical thermometers in chapter 4 of ncert solutions for class 7 science, where can i get accurate ncert solutions for class 7 science chapter 4, list the topics covered in chapter 4 of ncert solutions for class 7 science., leave a comment cancel reply.

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7th Class Science Heat Question Bank

Done heat total questions - 118.

question_answer 1) The direction of flow of heat is

A) always from hotter body to a cooler body done clear

B) always from cooler body to a hotter body. done clear

C) always from a body at a lower temperature to a body at higher temperature done clear

D) All of the above done clear

question_answer 2) Which of the following devices is used for measurement of temperature of human body?

A) Stethoscope done clear

B) Clinical thermometer done clear

C) Laboratory thermometer done clear

D) None of these done clear

question_answer 3) The clinical thermometers presently in use in India are marked with a temperature scale. This scale corresponds to which of the following?

A) Celsius             done clear

B) Farenheit done clear

C) Both (a) and (b)           done clear

question_answer 4) The normal temperature of human body is

A)  \[35{}^\circ C\]                                done clear

B)  \[37{}^\circ C\] done clear

C)  \[39{}^\circ C\]                                done clear

question_answer 5) The flow of heat by conduction is generally observed in case of

A) solids               done clear

B) liquids done clear

C) gases                            done clear

D) All of these done clear

question_answer 6) In which mode of heat transfer does the transfer of heat occur as a wave?

A) Conduction                  done clear

B) Convection done clear

C) Radiation       done clear

question_answer 7) One feels sensation of heat when exposed to

A) ultra violet rays            done clear

B) infra-red rays done clear

C) X-rays                          done clear

D) gamma rays done clear

question_answer 8) Which of the following is a good conductor of heat?

A) Wood                           done clear

B) Plastic done clear

C) Aluminium      done clear

question_answer 9) In sea breeze

A) cold air moves from sea towards land during day time done clear

B) hot air moves from sea towards land during day time done clear

C) cold air moves from land towards sea during day time done clear

D) None of the above is correct done clear

question_answer 10) In land breeze

A) cold air moves from sea towards land during night. done clear

B) hot air moves from sea towards land during night. done clear

C) cold air moves from land towards sea during night. done clear

question_answer 11) Mercury is generally used in thermometer because it has a

A) high fluidity                  done clear

B) high density done clear

C) high conductivity         done clear

D) high specific heat done clear

question_answer 12) Nights are cooler in the deserts because

A) sand radiates heat less quickly as compared to earth done clear

B) the sky is generally clear done clear

C) sand radiates heat more quickly as compared to earth done clear

D) the sky is generally cloudy. done clear

question_answer 13) Seema is in a hurry and wants her noodles to cool down faster. She should put it on a plate made of

A) wood                           done clear

B) paper done clear

C) plastic                          done clear

D) metal done clear

question_answer 14) On a Fahrenheit scale

A) Boiling point of water is \[212{}^\circ F\] done clear

B) The temperature will be equal to that on the Celsius scale at \[-40{}^\circ C\] done clear

C) The difference between the upper fixed point and the lower fixed point is divided into 180 equal parts done clear

question_answer 15) Expansion of a substance on heating depends on

A) nature of the substance done clear

B) rise in temperature done clear

C) both A and B done clear

D) color of the substance done clear

question_answer 16) On a cold day, it is hard to open the lid of a tight container. But when you gently heat the neck you can easily open the lid. Why?

A) On heating glass expands and lid contracts done clear

B) Lid expands more than the neck and thus slides easily done clear

C) Neck becomes slippery on heating done clear

D) Lids of the bottles cannot bear the heat done clear

question_answer 17) Process of change of state from gaseous state to liquid state is called

A) freezing            done clear

B) sublimation done clear

C) boiling              done clear

D) condensation done clear

question_answer 18) When two bodies at different temperatures are placed in thermal contact with each other, heat flows from the body at higher temperature to the body at lower temperature until them both acquire the same temperature. Assuming that there is no loss of heat to the surroundings, the heat

A) gained by the hotter body will be equal to the heat lost by the colder body done clear

B) the heat gained by the hotter body will be less than the heat lost by the colder body done clear

C) the heat gained by the hotter body will be greater than the heat lost by the colder body done clear

D) the heat lost by the hotter body will be equal to the heat gained by the colder body. done clear

question_answer 19) We receive heat energy from the sun through ______ mode of transmission

A) conduction      done clear

B) convection done clear

C) radiation         done clear

D) yet to be found done clear

question_answer 20) Conduction is possible

A) when the bodies are apart from each other done clear

B) when the bodies have same temperature and in thermal contact done clear

C) when they have different temperatures maintaining distance between them done clear

D) bodies should be in contact and should have different temperatures done clear

question_answer 21) Cups are not made of metals. The reason is

A) metals are good conductors done clear

B) metals are bad conductors done clear

C) metals are expensive done clear

D) None of the above done clear

question_answer 22) Which of the following statement(s) is/are correct?

A) Temperature is a measure of total amount of heat contained in an object. done clear

B) Temperature is a measure of degree of hotness or coldness of a body. done clear

C) Both the above are correct done clear

question_answer 23) It is a reliable measure of degree of hotness of an object. It is

A) heat                             done clear

B) temperature done clear

C) Both of these                done clear

question_answer 24) The movement of cold air from sea towards land during daytime is called

A) air breeze        done clear

B) sea breeze done clear

C) land breeze      done clear

question_answer 25) Why stainless steel pans are generally provided with copper bottoms?

A) Copper bottom makes the pan more durable done clear

B) Copper bottom makes the pan appear beautiful done clear

C) Copper is a better conductor of heat than steel done clear

D) Copper can be cleaned more easily as compared to steel done clear

question_answer 26) In places of hot climate it is advised that the outer walls of houses be painted white.

A) White color is good reflector. So the heat falling on the wall gets reflected and wall is not heated done clear

B) White makes the wall look beautiful done clear

C) Other colors will be expensive done clear

question_answer 27) What do you mean by heat?

A) Heat is a measure of temperature. done clear

B) Heat is a form of potential. done clear

C) It is form of energy which gets transferred from a hot to a cold body. done clear

D) None of the above. done clear

question_answer 28) Which of the following pairs may give equal numerical values of the temperature of a body?

A) Fahrenheit and Celsius done clear

B) Celsius and Kelvin done clear

C) Kelvin and Platinum done clear

question_answer 29) On which of the following scales of temperature, the temperature is never negative?

A) Celsius                         done clear

B) Fahrenheit done clear

C) Reamer                        done clear

D) Kelvin done clear

question_answer 30) The smallest and old unit of heat energy is:

A) Calorie     done clear

B) Calorie done clear

C) Joule                            done clear

D) none of the above done clear

question_answer 31) More is the difference in temperature of the bodies in contact:

A) More is the rate of flow of heat from a body at a higher temperature to a body at lower temperature. done clear

B) More is the rate of flow of heat from a body at a lower temperature to a body at higher temperature. done clear

C) There is no change in the rate of flow of heat done clear

question_answer 32) Near coastal regions, the sea breeze blows:

A) during day time only done clear

B) during night time only done clear

C) throughout the day and night done clear

question_answer 33) In a vacuum flask, which methods of heat transfer are prevented by the vacuum?

A) Conduction only done clear

B) Convection only done clear

C) Conduction and convection only done clear

D) Conduction, convection and radiation done clear

question_answer 34) The device used to measure temperature of human body and is provided with a scale of temperature range\[35{}^\circ C\]to\[42{}^\circ C\]is called......

A) Thermometer done clear

question_answer 35) It is a mode of transfer of heat from one part of a substance to another part and in it there is no movement of the substance. This mode is

A) Conduction    done clear

C) Radiation                     done clear

D) all of these done clear

question_answer 36) Sea breeze refers to

A) Cold air that moves from sea towards land during night time. done clear

B) Cold air that moves from sea towards land during day time. done clear

C) Both the above. done clear

question_answer 37) The final temperature of a mixture of water obtained by mixing equal volumes of water at \[2{}^\circ C\] and\[4{}^\circ C\] will be

A)  \[1{}^\circ C\]                                  done clear

B)  \[2{}^\circ C\] done clear

C)  \[3{}^\circ C\]         done clear

D)  \[4{}^\circ C\] done clear

question_answer 38) For a clinical thermometer we use a solid and a liquid. The liquid used in a clinical thermometer is

A) a metal done clear

B) a non-metal done clear

C) neither a metal nor a non-metal done clear

D) none of the above is correct done clear

question_answer 39) Which of the following is an insulator?

A) Wood                           done clear

C) Both of these     done clear

A) A\[\to \] (s), B\[\to \] (r), C\[\to \] (q), D\[\to \] (p) done clear

B) A\[\to \] (p), B\[\to \] (q), C\[\to \] (r), D\[\to \] (s) done clear

C) A\[\to \] (q), B\[\to \] (p), C\[\to \] (r), D\[\to \] (s) done clear

D) A\[\to \] (r), B\[\to \] (s), C\[\to \] (p), D\[\to \] (q) done clear

A) A\[\to \] (r), B\[\to \] (s), C\[\to \] (p), D\[\to \] (q) done clear

B) A\[\to \] (r), B\[\to \] (s), C\[\to \] (p), D\[\to \] (q) done clear

C) A\[\to \] (s), B\[\to \] (r), C\[\to \] (q), D\[\to \] (p) done clear

D) A\[\to \] (s), B\[\to \] (p), C\[\to \] (r), D\[\to \] (q) done clear

A) A\[\to \] (p), B\[\to \] (q), C\[\to \] (r), D\[\to \] (s) done clear

B) A\[\to \] (q), B\[\to \] (p), C\[\to \] (r), D\[\to \] (s) done clear

C) A\[\to \] (q), B\[\to \] (p), C\[\to \] (s), D\[\to \] (r) done clear

D) A\[\to \] (p), B\[\to \] (q), C\[\to \] (s), D\[\to \] (r) done clear

question_answer 43) DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 A clinical thermometer is used to measure the body temperature of human beings. It consists of a long, narrow, uniform glass tube. It has a bulb at one end. The bulb contains mercury. This thermometer read temperatures from \[35{}^\circ C\] to\[42{}^\circ C\]. A clinical thermometer can be used to measure the body temperature of human beings. A person suffering with fever is likely to show which of the following readings on this thermometer?

A)  \[35{}^\circ C\]                                done clear

B)  \[36{}^\circ C\] done clear

C)  \[37{}^\circ C\]                                done clear

D)  \[39{}^\circ C\] done clear

question_answer 44) DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 A clinical thermometer is used to measure the body temperature of human beings. It consists of a long, narrow, uniform glass tube. It has a bulb at one end. The bulb contains mercury. This thermometer read temperatures from \[35{}^\circ C\] to\[42{}^\circ C\]. What for is a clinical thermometer provided with a kink?

A) To keep the mercury within the range of \[35{}^\circ C\]-\[42{}^\circ C\] done clear

B) To allow the temperature reading to remain unchanged after the use of temperature until a jerk is given. done clear

C) To make the thermometer size smaller. done clear

D) All of the above are correct. done clear

question_answer 45) DIRECTIONS: Read the passage given below and answer the questions that follow. Passage - 1 A clinical thermometer is used to measure the body temperature of human beings. It consists of a long, narrow, uniform glass tube. It has a bulb at one end. The bulb contains mercury. This thermometer read temperatures from \[35{}^\circ C\] to\[42{}^\circ C\]. Which of the following precautions should be used while using a clinical thermometer?

A) It should be washed before use. done clear

B) It should be washed after use. done clear

C) It should be washed preferably with some antiseptic. done clear

D) All the above. done clear

question_answer 46) DIRECTIONS: Read the passage given below and answer the questions that follow. Passage-2 Light a candle. Keep one hand above the candle flame and one hand on the side of the flame. Do you feel any difference in degree of hotness felt by two hands? Which hand feels hot?

A) The hand that was kept above the flame. done clear

B) The hand that was kept on the side of the flame. done clear

C) Both hands feel equally hot. done clear

D) None of these is correct. done clear

question_answer 47) DIRECTIONS: Read the passage given below and answer the questions that follow. Passage-2 Light a candle. Keep one hand above the candle flame and one hand on the side of the flame. Do you feel any difference in degree of hotness felt by two hands? In this activity the mode of transference of heat is

A) Conduction                  done clear

D) none of these done clear

question_answer 48) DIRECTIONS: Read the passage given below and answer the questions that follow. Passage-2 Light a candle. Keep one hand above the candle flame and one hand on the side of the flame. Do you feel any difference in degree of hotness felt by two hands? How does the heat travel in air?

A) The air near the heat source gets hot and rises. done clear

B) The air from sides comes to take its place. done clear

C) In this way air gets heated. done clear

D) All the above are correct. done clear

question_answer 49) DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Heat always flows from a larger object to a smaller object. Reason (R): Various modes by which heat can flow are conduction, convection and radiation.

A) Both A and R are true and R is the correct explanation of A. done clear

B) Both A and R are true but R is not the correct explanation of A. done clear

C) A is true but R is false. done clear

D) A is false but R is true. done clear

question_answer 50) DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): When a body A at temperature \[50{}^\circ C\] is brought in contact with a body B at temperature \[30{}^\circ C,\] heat flows from the body 4 to the body B. Reason (R): Heat always flows from a body at a low temperature to a body at a high temperature.

question_answer 51) DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Sea breeze blows during daytime. Reason (R): The air above the sea is hot and moves toward land.

question_answer 52) DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Two bodies at the same temperature may contain different amounts of heat. Reason (R): Two bodies may require different amounts of heat to maintain or acquire same temperature.

question_answer 53) DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): The flow of heat energy from one body to the other depends upon the amount of heat energy in them. Reason (R): Heat flows from lower temperature of the body to higher temperature of the body.

question_answer 54) DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Temperature is a measure of degree of hotness of our body. Reason (R): We use a clinical thermometer to measure the degree of hotness of our body.

question_answer 55) DIRECTIONS: The questions in this segment consist of two statements, one labeled as "Assertion A" and the other labeled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): A clinical thermometer has a scale in the range of \[37{}^\circ C\] to\[45{}^\circ C\]. Reason (R): The normal temperature of human body is\[37{}^\circ C\].

question_answer 56) DIRECTIONS: Read the following two statements carefully and choose the correct options. Statement 1: In a room containing air, heat can go from one place to another by radiation only. Statement 2: In conduction & convection, heat is transferred from one place to other by actual motion of heated material.

A) Statement (1) is correct while statement (2) is incorrect. done clear

B) Statement (2) is correct while statement (1) is incorrect. done clear

C) Both statements are correct done clear

D) Both statements are incorrect. done clear

question_answer 57) DIRECTIONS: Read the following two statements carefully and choose the correct options. Statement 1: Radiation is a method of transfer of heat. Statement 2: The process of heat transfer that does not require any medium is called convection.

A) (i)                                 done clear

B) (ii) done clear

C) (iii)                               done clear

D) (iv) done clear

A) conduction only done clear

B) conduction and convection done clear

C) radiation only done clear

D) radiation and convection done clear

A) A                      done clear

B) B done clear

C) C                                 done clear

D) D done clear

question_answer 61) One litre of water at \[30{}^\circ C\] is mixed with one litre of water at\[50{}^\circ C\]. The temperature of the mixture will be

A)  \[80{}^\circ C\] done clear

B) more than \[50{}^\circ C\] but less than \[80{}^\circ C\] done clear

C)  \[20{}^\circ C\] done clear

D) between \[30{}^\circ C\] and \[50{}^\circ C\] done clear

question_answer 62) Black objects are

A) good absorbers and bad emitters of heat done clear

B) good absorbers and good emitters of heat done clear

C) bad absorbers and good emitters of heat done clear

D) bad absorbers and bad emitters of heat done clear

question_answer 63) Four identical kettles, having the same amount of water, have bases made of different metals of same thickness. If these kettles are placed on identical flames, water will boil first in the kettle the base of which is made of

A) Stainless steel               done clear

B) brass done clear

C) Aluminum       done clear

D) copper done clear

question_answer 64) The glass tube used for construction of a thermometer should be

A) long                              done clear

B) narrow done clear

C) uniform            done clear

question_answer 65) When a liquid in a beaker is heated on a gas burner

A) Heated molecules become less dense and rise done clear

B) Colder molecules from above move down and get heated done clear

C) The heat is transferred by convection done clear

D) All of these are correct done clear

question_answer 66) Two laboratory thermometers are marked as 'A' and 'B'. The bulb of thermometer 'A' is wrapped in a white cloth and that of thermometer 'B' in black cloth. Both the thermometers are placed in sunlight for an hour. After one hour:

A) Both the thermometers will read the same temperature done clear

B) Thermometer 'A' will show higher temperature than 'B' done clear

C) Thermometer 'B' will show higher temperature than 'A' done clear

D) None of the above is correct. done clear

question_answer 67) Which one of the following will not help to cool down a cup of hot tea?

A) Stirring the contents of cup continuously done clear

B) Adding a piece of ice to the cup of hot tea done clear

C) Pouring the hot tea in a saucer done clear

D) Adding more sugar to the cup of tea. done clear

question_answer 68) A wooden spoon is dipped in a cup of ice cream. Its other end

A) becomes cold by the process of conduction; done clear

B) becomes cold by the process of convection; done clear

C) becomes cold by the process of radiation; done clear

D) does not become cold. done clear

question_answer 69) In a car, radiator and fan are used to cool the engine. The heat transfer modes involved are

A) conduction and convection done clear

B) convection and radiation done clear

C) conduction and radiation done clear

D) conduction, convection and radiation done clear

question_answer 70) The minimum possible temperature beyond which water cannot be cooled is

A)  \[-98.5{}^\circ C\]                done clear

B)  \[100{}^\circ C\] done clear

C)  \[-273.15{}^\circ C\]       done clear

D)  \[-469.5{}^\circ C\] done clear

question_answer 71) Why are two blankets warmer than one?

A) Two blankets have more wool and hence provide greater warmth. done clear

B) Two blankets enclose air which does not allow the cold to penetrate. done clear

C) Two blankets compress the air in between the body and the blankets and this compression produces heat. done clear

D) None of these. done clear

question_answer 72) The freezer in a refrigerator is fitted near the top

A) To keep it away from the hot compressor which is near the bottom? done clear

B) so that it can cool the whole interior by setting up convection currents done clear

C) for the sake of convenience done clear

question_answer 73) We cannot use mercury thermometer at low temperatures because:

A) glass might break down at low temperature done clear

B) heat does not flow from the body whose measurement we are taking with the thermometer done clear

C) at low temperatures mercury becomes transparent and it becomes difficult to take the readings done clear

D) Mercury freezes at low temperatures done clear

question_answer 74) Iron glows in red color when it is heated to very high temperature because:

A) Heat we supply assumes red color at high temperature done clear

B) Mechanical energy is being converted into heat energy done clear

C) All me fats glow in red color when heated done clear

D) Heat energy is being converted into light energy done clear

question_answer 75) Gaps are left between railway tracks because:

A) gaps give the space to the tracks to expand in summer heat done clear

B) gaps hold the tracks firmly done clear

C) to produce gentle rhythmic sound when the train moves on the track done clear

D) it is customary to leave the gaps done clear

question_answer 76) The temperature of the substance remains constant when it is melting and boiling though some quantity of heat is supplied. What happens to this energy?

A) It is dissipated as sound energy done clear

B) It is consumed to increase the energy of the molecules done clear

C) It is used to change the state of the substance done clear

D) It is still an unsolved problem in science done clear

question_answer 77) A coin is dipped in the molten wax in a glass tube. When we heat the upper part of the glass tube, the wax around the coin will not melt because:

A) wax has a very high melting point done clear

B) wax is a good conductor of heat done clear

C) glass is a good conductor of heat done clear

D) wax and glass are bad conductors done clear

question_answer 78) Rooms are fitted with ventilators to let the air move around. The phenomenon involved is:

A) conduction                   done clear

question_answer 79) Reflecting solar films are used on the top of the cars to:

A) produce electricity done clear

B) to absorb more light done clear

C) to prevent heating by radiation done clear

D) to make to strong done clear

question_answer 80) Which of the following is correct?

A) We can easily find the degree of hotness of a body by using the sense of touch. done clear

B) We prefer to wear white clothes made of cotton during winter because cotton is a bad conductor of heat. done clear

C) The thermometer that we use to measure body temperature is called clinical thermometer. done clear

D) All the above are correct done clear

question_answer 81) Which of the following is correct?

A) The range of clinical thermometer is \[35{}^\circ C~-\,45{}^\circ C\] done clear

B) The normal body temperature of human body is \[39{}^\circ C.\] done clear

C) Heat flows from a body containing larger amount of heat to a body containing lesser amount of heat. done clear

question_answer 82) Why does a clinical thermometer have a range of\[35{}^\circ C-42{}^\circ C\]?

A) To keep its size compact done clear

B) The temperature of human body can normally fluctuate between these two extreme ranges of lower and higher temperatures. done clear

question_answer 83) In which case rate of flow of heat form P to Q is least:

A)  \[P-100{}^\circ C,\] \[Q-40{}^\circ C\]      done clear

B)  \[P-90{}^\circ C,\] \[Q-10{}^\circ C\] done clear

C)  \[P-50{}^\circ C,\] \[Q-10{}^\circ C\]        done clear

D)  \[P-60{}^\circ C,\] \[Q-50{}^\circ C\] done clear

question_answer 84) A body P at a higher temperature is placed in contact with another body Q at lower temperature, till an equilibrium stage is reached. At this stage:

A) the heat will stop flowing from P to Q done clear

B) the heat will stop flowing from Q to P done clear

C) the heat continue flowing from P to Q and vice versa done clear

question_answer 85) Two bodies P and Q are in contact with each other, such that P is at a higher temperature than Q. When equilibrium temperature is reached "X" units of heat energy is given by the body P. The heat energy received by the body Q is:

A) More than X                 done clear

B) Less than X done clear

C) Equal to X       done clear

question_answer 86) The land breeze blows from land to sea in coastal regions, because, the land:

A) cools slowly as compared to seawater done clear

B) cools rapidly as compared to seawater done clear

C) cools at the same rate as seawater done clear

question_answer 87) A fan produces a feeling of comfort because

A) a fan supplies cool air done clear

B) the evaporation of sweat done clear

C) fan increases the humidity in air done clear

D) fan decreases the humidity in air done clear

question_answer 88) Which of the following statement is true?

A) Metal are bad conductors done clear

B) In gases, heat is transferred by conduction done clear

C) In conduction, molecules move from hotter to colder parts transmitting energy. done clear

D) Metals conduct heat better than the gases done clear

question_answer 89) Good absorbers of heat are

A) Poor emitters               done clear

B) non-emitters done clear

C) Good emitters      done clear

D) highly polished done clear

question_answer 90) The temperature of the sun is measured with

A) Platinum thermometer done clear

B) Gas thermometer done clear

C) Pyrometer done clear

D) Vapor pressure thermometer done clear

question_answer 91) Temperature is a

A) microscopic concept done clear

B) macroscopic concept done clear

C) space-time concept done clear

question_answer 92) How is heat transferred through the base of a metal saucepan?

A) by conduction only done clear

B) by radiation only done clear

C) by conduction and convection done clear

D) by convection and radiation done clear

question_answer 93) Why do we wear woolen clothes in winter?

A) Wool is a poor conductor of heat done clear

B) Wool is a good conductor of heat done clear

question_answer 94) Why stainless steel pans are generally provided with copper bottoms?

D) Copper can be learned more easily as compared to steel done clear

question_answer 95) In the process of flow of heat by conduction

A) There is no movement of the substance done clear

B) The heat transfer takes place from higher temperature part of body to lower temperature part of body done clear

C) Occurs when one end of an iron rod is heated on a burner done clear

question_answer 96) Suppose we take two identical size rods (one wooden rod and another iron rod) and wrap each one of them in a piece of paper, and heat, these rods with a candle flame. On being heated, the paper around the iron rod does not bum but the one around wooden rod catches fire. Which of the following is the possible reason for this?

A) Iron being a good conductor, conducts away heat given to paper. done clear

B) Wood being an insulator, takes away all the heat. done clear

C) In case of iron rod, the candle is near the paper. done clear

D) Paper around iron rod is thicker. done clear

A) A\[\to \] (p), B\[\to \] (q), C\[\to \] (r), D\[\to \] (s). done clear

B) A\[\to \] (q), B\[\to \] (r), C\[\to \] (s), D\[\to \] (p) done clear

C) A\[\to \] (r), B\[\to \] (s), C\[\to \] (p), D\[\to \] (q) done clear

D) A\[\to \] (s), B\[\to \] (p), C\[\to \] (q), D\[\to \] (r) done clear

A) A\[\to \] (q), B\[\to \] (p), C\[\to \] (r), D\[\to \] (s) done clear

C) A\[\to \] (s), B\[\to \] (p), C\[\to \] (q), D\[\to \] (r) done clear

question_answer 99) DIRECTIONS: Read the passage given below an answer the questions that follow. Passage - 1 Substances that conduct heat very well are called good conductors of heat or thermal conductors. All the metals such as silver, copper, aluminum, iron, mercury and metal alloys such as brass, steel and stainless steel are good conductors of heat. Though all the metals are good conductors of heat, some metals are better conductors of heat than the others. Among metals, silver metal is the best conductor of heat, next is copper and lowest is lead. Substances that do not conduct heat very welfare called bad conductors or poor conductors or insulators of heat. Some of the examples of heat or thermal insulators are plastic, wood, paper, cloth, thermocol, rubber, etc. Liquids like water are poor conductors and gases are very poor conductors of heat. Thus, air is a very good insulator of heat. It is observed that when glass is heated, it cracks while metal does not. Which of the following statements explain this phenomenon?

A) Metal is a poor conductor of heat. done clear

B) The expansion of the glass after heating is uniform and therefore it cracks. done clear

C) In case of glass the heat is transmitted quickly when heated. done clear

D) Glass is a poor conductor of heat. done clear

question_answer 100) DIRECTIONS: Read the passage given below an answer the questions that follow. Passage - 1 Substances that conduct heat very well are called good conductors of heat or thermal conductors. All the metals such as silver, copper, aluminum, iron, mercury and metal alloys such as brass, steel and stainless steel are good conductors of heat. Though all the metals are good conductors of heat, some metals are better conductors of heat than the others. Among metals, silver metal is the best conductor of heat, next is copper and lowest is lead. Substances that do not conduct heat very welfare called bad conductors or poor conductors or insulators of heat. Some of the examples of heat or thermal insulators are plastic, wood, paper, cloth, thermocol, rubber, etc. Liquids like water are poor conductors and gases are very poor conductors of heat. Thus, air is a very good insulator of heat. Which of the following is the best insulator of heat?

A) air                done clear

B) silver done clear

C) iron                              done clear

D) water done clear

question_answer 101) DIRECTIONS: Read the passage given below an answer the questions that follow. Passage - 1 Substances that conduct heat very well are called good conductors of heat or thermal conductors. All the metals such as silver, copper, aluminum, iron, mercury and metal alloys such as brass, steel and stainless steel are good conductors of heat. Though all the metals are good conductors of heat, some metals are better conductors of heat than the others. Among metals, silver metal is the best conductor of heat, next is copper and lowest is lead. Substances that do not conduct heat very welfare called bad conductors or poor conductors or insulators of heat. Some of the examples of heat or thermal insulators are plastic, wood, paper, cloth, thermocol, rubber, etc. Liquids like water are poor conductors and gases are very poor conductors of heat. Thus, air is a very good insulator of heat. When we touch a steel rod and a paper simultaneously, we feel that the rod is colder because:

A) Iron being a good conductor conducts more heat from our body done clear

B) Paper being a good conductor conducts more heat from our body done clear

C) More heat flows from the iron to our body done clear

D) More heat flows from the paper to our body done clear

A) The temperature in cup A will decrease and the temperature in cup B will increase. done clear

B) The temperature in cup A will decrease and the temperature in cup B will decrease. done clear

C) The temperature in cup A will increase and the temperature in cup B will increase. done clear

D) The temperature in cup A will increase and the temperature in cup B will decrease. done clear

A) Radiation of heat from the water in the cups to the thermometers done clear

B) Conduction of heat through the aluminum bar done clear

C) Radiation of heat from the water in the cups into the air done clear

D) Conduction of heat through the air to the Water in the cups done clear

question_answer 104) DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Glass tumbler breaks in winter when hot water is poured to it. Reason (R): When hot water is poured, the outer surface of glass expands.

question_answer 105) DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Temperature decreases with increasing height above sea level. Reason (R): Atmosphere is mainly heated by conduction from the earth.

question_answer 106) DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): The temperature of a body is\[10{}^\circ C\]. Its temperature in Fahrenheit scale is\[50{}^\circ F\]. Reason (R): Celsius (C) and Fahrenheit (F) are related as \[F=\frac{9}{5}C+32\]

question_answer 107) DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Land and sea breezes are caused in coastal regions. Reason (R): The specific heat of land is about 4 times less than sea water.

question_answer 108) DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Two bodies at different temperatures, if brought in thermal contact do not necessary settle to the mean temperature. Reason (R): The two bodies may have different thermal capacities.

question_answer 109) DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): A brass tumbler feels much colder than a wooden tray on a chilly day. Reason (R): The ability to conduct heat of brass is less than that of wood.

question_answer 110) DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Snow is better insulator than ice. Reason (R): Snow contain air packet and air is good insulator of heat.

question_answer 111) DIRECTIONS: The questions in this segment consists of two statements, one labelled as "Assertion A" and the other labelled as "Reason R". You are to examine these two statements carefully and decide if the Assertion A and Reason R are individually true and if so, whether the reason is a correct explanation of the assertion. Select your answers to these items using codes given below. Assertion (A): Sea breeze refers to the movement of cold air from sea towards land during day time. Reason (R): Land breeze refers to the movement of cold air from land towards sea during night time.

question_answer 112) DIRECTIONS: Read the following three statements carefully and choose the correct option. Statement-1: Room heaters and refrigerators lose most of their heat by convection. Statement-2: A hot surface heat the air next to it. The hot air rises, to be replaced by cooler air which then heat, and so on. Statement-3: Radiation is a method of transfer of heat.

A) Statement (1) and (3) are incorrect while statement (2) is correct. done clear

B) Statement (1) and (2) are incorrect while (3) is correct. done clear

C) All the statements are correct. done clear

D) All the statements are incorrect. done clear

question_answer 113) DIRECTIONS: Read the following three statements carefully and choose the correct option. Statement-1: The bulb of one thermometer is spherical while that of the other is cylindrical. Both have equal amount of mercury. The response of the cylindrical bulb thermometer will be quicker. Statement-2: Heat conduction in a body is directly proportional to cross-sectional area. Statement-3: The range of clinical thermometer is \[35{}^\circ C\] to \[42{}^\circ C\]

A) The ball will not pass through because there is no change in the ring. done clear

B) The ball can now pass through it because the ring diameter expands on heating. done clear

C) The ball gets stuck because the diameter of the hole decreases on expansion. done clear

A) The level of alcohol falls in both limbs. done clear

B) The level of alcohol in the limb X rises while that in limb Y falls. done clear

C) The level of alcohol in limb X falls while that in limb Y rises. done clear

D) There is no change in the levels of alcohol in the two limbs. done clear

A) Both hands give the same feeling about hotness of water to both the hands. done clear

B) The hand taken out from ice cold water will tell that the water in (ii) is hot while the other hand will tell the water in (ii) is cold. done clear

C) The hand taken out from ice cold water will tell that the water in (ii) is cold while the other hand will tell that water in (ii) is hot. done clear

A) A                                  done clear

C) C                     done clear

A) Air is a good conductor of heat and conducts the heat away from the ice cream. done clear

B) Air is a poor conductor of heat and stops the heat from reaching the ice cream. done clear

C) The metal dish is a good conductor of heat and conducts the heat away from the ice cream. done clear

D) The metal dish is a poor conductor of heat and stops the heat from reaching the ice cream. done clear

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Cbse, ncert and icse solution online, class 7 science case study question, case study question class 7 science (cbse / ncert board).

Class 7 Science Case Study Question and Answer: CBSE / NCERT Board Class 7 Science Case Study Question prepared by expert Science Teacher. Students can learn Case Based Question / Paragraph Type Question for NCERT Class 7 Science.

There are total 18 chapter Nutrition in Plants, Nutrition in Animals, Fibre to Fabric, Heat, Acids, Bases and Salts, Physical and Chemical Changes, Weather, Climate and Adaptations of Animals to Climate, Winds, Storms and Cyclones, Soil, Respiration in Organisms, Transportation in Animals and Plants, Reproduction in Plants, Motion and Time, Electric Current and Its Effects, Light, Water: A Precious Resource, Forests: Our Lifeline, Wastewater Story

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CBSE Class 7 Science Case Study Question

• Chapter 1 Nutrition in Plants Case Study Question
• Chapter 2 Nutrition in Animals Case Study Question
• Chapter 3 Fibre to Fabric Case Study Question
• Chapter 4 Heat Case Study Question
• Chapter 5 Acids, Bases and Salts Case Study Question
• Chapter 6 Physical and Chemical Changes Case Study Question
• Chapter 7 Weather, Climate and Adaptations of Animals to Climate Case Study Question
• Chapter 8 Winds, Storms and Cyclones Case Study Question
• Chapter 9 Soil Case Study Question
• Chapter 10 Respiration in Organisms Case Study Question
• Chapter 11 Transportation in Animals and Plants Case Study Question
• Chapter 12 Reproduction in Plants Case Study Question
• Chapter 13 Motion and Time Case Study Question
• Chapter 14 Electric Current and Its Effects
• Chapter 15 Light
• Chapter 16 Water: A Precious Resource
• Chapter 17 Forests: Our Lifeline
• Chapter 18 Wastewater Story

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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• Lakhmir Singh Class 7 Solution
• NCERT Class 7 Math Solution

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MCQ Questions for Class 7 Science Chapter 4 Heat with Answers

We have compiled the NCERT MCQ Questions for Class 7 Science Chapter 4 Heat with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 7 Science with Answers on a daily basis and score well in exams. Refer to the Heat Class 7 MCQs Questions with Answers here along with a detailed explanation.

Heat Class 7 MCQs Questions with Answers

Choose the correct option.

Question 1. Which of the following is a good conductor of heat? (a) Iron (b) Steel (c) Aluminium (d) All of these

Answer: (d) All of these

Question 2. A device used to measure the temperature is (a) transistor (b) thermometer (c) mercury (d) none of these

Answer: (b) thermometer

Question 3. Which of the following thermometers has a kink? (a) Laboratory thermometer (b) Clinical thermometer (c) Both (a) and (b) (d) Digital thermometer

Answer: (b) Clinical thermometer

Question 4. What is the range of the temperature reading of a clinical thermometer? (a) 35°C – 42°C (b) -10°C – 110°C (c) 0°C – 100°C (d) 32°C – 42°C

Answer: (a) 35°C – 42°C

Question 5. Which of the following thermometer contains mercury? (a) Clinical thermometer (b) Laboratory thermometer (c) Both (a) and (b) (d) None of these

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

Question 6. What is the range of the temperature reading of a laboratory thermometer? (a) -10°C – 110°C (b) 35°C – 42°C (c) 0°C – 100°C (d) -10°C – 100°C

Answer: (a) -10°C – 110°C

Question 7. The transfer of heat from hotter body to colder body is called (a) conduction (b) induction (c) convection (d) radiation

Answer: (a) conduction

Question 8. The process of transferring of heat without any contact between the source of heat and the heated object is called (a) conduction (b) convection (c) radiation (d) induction

Answer: (c) radiation

Question 9. The normal temperature of human body is (a) 35°C (b) 37°C (c) 40°C (d) 42°C

Answer: (b) 37°C

Question 10. The materials which allow the heat to pass through them easily are called (a) insulators (b) conductors (c) semiconductors (d) poor conductors

Answer: (b) conductors

Question 11. Which of the following is an insulator? (a) Wood (b) Iron (c) Copper (d) Zinc

Answer: (a) Wood

Question 12. The air from the sea is called (a) sea breeze (b) land breeze (c) wind (d) none of these

Answer: (a) sea breeze

Question 13. Which colour absorbs more heat? (a) Black (b) White (c) Blue (d) Red

Answer: (a) Black

Question 14. What is the SI unit of temperature? (a) Kelvin (b) Celsius (c) Fahrenheit (d) None of these

Answer: (a) Kelvin

Question 15. Which one is filled in the bulb of a thermometer? (a) Mercury (b) Lead (c) Copper (d) Silver

Answer: (a) Mercury

Question 16. A marble tile would feel cold as compared to a wooden tile on a winter morning, because the marble tile (a) is a better conductor of heat than the wooden tile. (b) is polished while wooden tile is not polished. (c) reflects more heat than wooden tile. (d) is a poor conductor of heat than the wooden tile.

Answer: (a) is a better conductor of heat than the wooden tile.

Question 17. A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep himself warm because (a) friction between the layers of newspaper produces heat. (b) air trapped between the layers of newspaper is a bad conductor of heat. (c) newspaper is a conductor of heat. (d) newspaper is at a higher temperature than the temperature of the surrounding.

Answer: (b) air trapped between the layers of newspaper is a bad conductor of heat.

Question 18. Sonu and Ria measured their body temperature Sonu found his to be 98.6°F and Ria recorded 37°C. Which of the following statement is true? (a) Sonu has a higher body temperature than Ria. (b) Sonu has a lower body temperature than Ria. (c) Both have normal body temperature. (d) Both are suffering from fever.

Answer: (c) Both have normal body temperature.

Answer: (a)

Answer: (c)

Question 21. Land breeze blows from (a) lower surface to upper surface (b) sea to land (c) upper surface to lower surface (d) land to sea

Answer: (d) land to sea

Question 22. Liquid used in thermometers is (a) alcohol (b) mercury (c) water (d) oil

Answer: (b) mercury

Question 23. Liquids and gases transfer the heat by (a) radiation (b) conduction (c) convection (d) all of these

Answer: (c) convection

Question 24. Metals are conductors of heat. (a) average (b) poor (c) good (d) some are poor conductors

Answer: (c) good

Question 25. Woollen clothes (a) keep us cool (b) decrease the body temperature (c) increase the body temperature (d) keep us warm

Answer: (d) keep us warm

Question 26. Degree of hotness or coldness is called (a) temperature (b) power (c) heat (d) energy

Answer: (a) temperature

Question 27. Sunlight reaches the earth’s surface through (a) convection (b) radiation (c) conduction (d) radio waves

Answer: (b) radiation

Question 28. Heat is (a) a form of energy (b) a type of matter (c) sometimes energy and sometimes matter (d) none of these

Answer: (a) a form of energy

Question 29. The normal temperature of human body is (a) 37 K (b) 37°F (c) 37°C (d) All of these

Answer: (c) 37°C

Question 30. In solids, heat transfer takes place primarily due to (a) conduction (b) convection (c) radiation (d) none of these

Fill in the Blanks

Question 1. A reliable measure of the hotness of an object is known as ……………..

Answer: temperature

Question 2. …………….. is used to measure the hotness or coldness of our body.

Answer: Thermometer

Question 3. Boiling and melting point of water is …………….. and …………….. respectively.

Answer: 100°C, 0°C

Question 4. The transfer of heat from hotter body to colder body is called ……………..

Answer: conduction

Question 5. The normal temperature of human body is …………….. °C.

Question 6. …………….. is a good conductor of heat.

Answer: Iron

Question 7. …………….. is the SI unit of temperature.

Answer: Kelvin

Question 8. …………….. prevents mercury level from falling on its own.

Answer: Kink

Question 9. The materials which allow heat to pass through them easily are ……………..

Answer: conductors

Question 10. Plastic is a …………….. conductor of heat.

Answer: poor

Question 11. The air from the land is called …………….. breeze.

Answer: land

Question 12. …………….. surface absorb more heat.

Answer: Black

Question 13. All hot bodies radiate ……………..

Answer: heat

Question 14. The range of clinical thermometer is ……………..

Answer: 35°C to 42°C

Question 15. Heat transfer in liquid and gas occurs through a process called ……………..

Answer: convection

Question 16. The cold air blowing from the sea towards the land during the day is called ……………………..

Answer: sea breeze

Question 17. Wool is a …………………….. conductor of heat.

Question 18. The hot bodies radiate ……………………..

Question 19. Clothes of dark colours are better …………………….. of heat than the clothes of light colour.

Answer: absorber

Question 20. The hotness of a body is determined by its ……………………..

Question 21. Laboratory thermometers …………………….. lack

Answer: kink

Question 22. Digital thermometers do not contain ……………………..

Answer: mercury

Question 23. Heat transfer by …………………….. does not require any medium.

Answer: radiation

True or False

Question 1. We wear white clothes in summer to radiate heat from the body.

Answer: False

Question 2. Sea breeze and land breeze occur due to convection currents set up in the air.

Answer: True

Question 3. The heat from sun reaches us through convection.

Question 4. Conduction is a process of heat transfer in which vibrating particles give energy to the neighbouring ones.

Question 5. A reliable measure for the hotness of an object is called Kelvin.

Question 6. The thermometer used to measure the temperature of our body is called a clinical thermometer.

Question 7. A clinical thermometer reads temperature from 0°C to 30°C.

Question 8. The average normal temperature of the human body is 98.6°F.

Question 9. The maximum and minimum temperature of the days, reported in weather reports is measured by ‘maximum-minimum thermometer’.

Question 10. The range of a laboratory thermometer is generally from -20°C to 100°C.

Question 11. The ‘kink’ present in a clinical thermometer prevents the mercury level from falling on its own.

Question 12. Mercury is a toxic substance.

Question 13. Digital thermometers do not use mercury.

Question 14. In every case, heat flows from a hot object to a hotter one.

Question 15. Heat can cause expansion or combustion of an object.

Question 16. Water at higher temperatures feels more hot.

Question 17. Water and air both are good conductors of heat.

Question 18. We prefer to wear-light coloured clothes in winter.

Question 19. In convection, heat flows from one point to the other in such a way that there is actual motion of the particles of the medium.

Question 20. Normal temperature of human body is 37°F.

Question 21. Mercury is safe and non-toxic.

Question 22. Land breeze blows during daytime.

Question 23. Dark coloured clothes absorb more heat.

Match the Following

Hope the information shed above regarding NCERT MCQ Questions for Class 7 Science Chapter 4 Heat with Answers Pdf free download has been useful to an extent. If you have any other queries of CBSE Class 7 Science Heat MCQs Multiple Choice Questions with Answers, feel free to reach us so that we can revert back to us at the earliest possible.

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Case Study Questions Class 7 Science Weather, Climate and Adaptations of Animals to Climate

Case study questions class 7 science chapter 8 weather, climate and adaptations of animals to climate.

CBSE Class 7 Case Study Questions Science Weather, Climate and Adaptations of Animals to Climate. Important Case Study Questions for Class 7 Board Exam Students. Here we have arranged some Important Case Base Questions for students who are searching for Paragraph Based Questions Weather, Climate and Adaptations of Animals to Climate.

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

CBSE Case Study Questions Class 7 Science Weather, Climate and Adaptations of Animals to Climate

Case study 1.

All changes in the weather are caused by the sun. The sun is a huge sphere of

hot gases at a very high temperature. The distance of the sun from us is very

large. Even then the energy sent out by the sun is so huge that it is the source of all heat and light on the earth. So, the sun is the primary source of energy that causes changes in the weather. Energy absorbed and reflected by the earth’s surface, oceans and the atmosphere play important roles in determining the weather at any place. If you live near the sea, you would have realized that the weather at your place is different from that of a place in a desert, or near a mountain.

The weather reports are prepared by the Meteorological Department of the Government. This department collects data on temperature, wind, etc., and makes the weather prediction

Que. 1) Changes in weather are caused by sun and the sun is a fireball of hot gases is it true or false.

(c) None of the above

Que. 2) The distance between sun and earth is ………………………………………………………………………………………………………………………… as compared to the distance between earth and moon.

(c) Maximum

(d) Minimum

Que. 3) Who prepares the weather report?

(a) Meteorological department

(b) Weather department

(c) Rain department

(d) All of the above

Que. 4) What is sun?

Que. 5) What determines the weather of any place?

Que. 1) (a) True

Que. 2) (b) Large

Que. 3) (a) Meteorological department

Que. 4) Answer: The sun is a huge fireball of hot gases at very high temperature of several thousands of degrees or even more.

Que. 5) Answer: The energy of sun absorbed and reflected by oceans, earth’s surface and atmosphere plays a role in determining weather of any place.

Case study 2

Meteorologists record the weather every day. The records of the weather have been preserved for the past several decades. These help us to determine the weather pattern at a place. The average weather pattern taken over a long time, say 25 years, is called the climate of the place. If we find that the temperature at a place is high most of the time, then we say that the climate of that place is hot.

If there is also heavyrainfall on most of the days in the same place, then we can say that the climateof that place is hot and wet. The mean temperature for a given month is found in two steps.First wefind the average of the temperatures recorded during the month. Second, wecalculate the average of such average temperatures over many years.

Que. 1) ………………………………………………………………………..……. records the weather everyday.

(a) Radiologists

(b) Scientist

(c) Meteorologist

Que. 2) The average pattern of weather is taken over …………………………………………………………..……………………. many years to see the pattern of weather and also to have prediction of how it will be in next few years in advance so that humans can prepare for any sort of calamity.

Que. 3) The mean temperature of a given months is found in how many steps?

Que. 4) How would you say that the climate is hot and wet?

Que. 5) When do we say that the climate of a particular place is hot?

Que. 1) (c) Meteorologist

Que. 2) (d) 25

Que. 3) (d) 2

Que. 4) Answer: if the climate of a place is hot and also there is a heavy rainfall in the same place for few days then we say that the climate of that place is hot and wet.

Que. 5) Answer: if the temperature of a particular geographical area is hot for most of the days than we say that the climate of that area is hot.

Case study 3

The polar-regions present an extreme climate. These regions are covered with snow and it is very cold for most part of the year. For six months the sun does not set at the poles while for the other six months the sun does not rise. In winters, the temperature can be as low as –37°C. Animals living there have adapted to these severe conditions. Let us see how they are adapted by considering the examples of polar bears and penguins. Polar bears have white fur so that they are not easily visible in the snowy white background. It protects them from their predators. It also helps them incatching their prey. To protect them from extreme cold, they have two thick layers of fur. They also have a layer of fat under their skin. In fact, they are so well-insulated that they have to move slowly and rest often to avoid getting overheated. Physical activities on warm days necessitate cooling. So, the polar bear goes for swimming.

It is a goodswimmer. Its paws are wide and large, which help it not only to swim well butalso walk with ease in the snow. While swimming under water, it can close itsnostrils and can remain under water for long durations. It has a strong sense ofsmell so that it can catch its prey for food.

Que. 1) The Polar Regions are covered with ………………………………………………………………………………………… .

Que. 2) Polar bears have …………………………………………………………………………………….. fur and this fur helps them to keep a warm body temperature than the outside cold temperature environment and this ensure better survivability even in very harsh weather conditions.

Que. 3) What is the temperature at Polar Regions?

(a) 37degrees

(b) -37 degrees

(c) 45 degrees

(d) -50 degrees

Que. 4) What makes polar bears a good swimmer?

Que. 5) what protects the polar bear from cold?

Que. 1) (a) Snow

Que. 2) (d) White

Que. 3) (b) -37 degrees

Que. 4) Answer: the wide and large paws of polar bears make them a good swimmer.

Que. 5) Answer:  polar bears have two thick layer of fur which act as an insulating material against cold temperature.

Case study 4

Some migratory birds travel as much as 15000 km to escape the extreme climaticconditions at home. Generally they fly high where the wind flow is helpful andthe cold conditions allow them to disperse the heat generated by their flightmuscles. But how these birds travel to the same place year after year is still amystery. It seems that these birds have a built–in sense of direction and know inwhich direction to travel. Some birds probably use landmarks to guide them.

Manybirds may be guided by the sun during the day and stars at night. There is someevidence that birds may use the magnetic field of the earth to find direction. Andit is not only birds that migrate; mammals, many types of fish and insects arealso known to migrate seasonally in search of more hospitable climates.

Que. 1) The migratory birds travels ……………………………………………………………………………..….. Km of distance to escape the unfavorable weather to ensure better survivability and also to leave a less stressful life for several months and then they migrate again back to the place when the environment becomes good again.

Que. 2) Migratory birds uses ……………………………………………………..…………………………… to guide them.

(a) Landmarks

(c) Still a mystery

(d) None of the above

Que. 3) Many birds are guided by …………………………………………………….………… and ………………………………………………………………………….. .

(a) Sun and Stars

(b) Sun and Moon

(c) Sun and Sky

(d) Sun and Wind

Que. 4) Why does the birds migrate?

Que. 5) Other than birds which other organisms migrate?

Que. 1) (c) 15000

Que. 2) (a) Landmarks

Que. 3) (a) Sun and Stars

Que. 4) Answer: The birds migrate to avoid harsh weather conditions like low temperature.

Que. 5) Answer: other than birds many different types of insects and fishes are known to migrate to more favorable environmental place.

Case study 5

The tropical region has generally a hot climate because of its location around the equator. Even in the coldest month the temperature is generally higher thanabout 15°C. During hot summers, thetemperature may cross 40°C. Days andnights are almost equal in lengththroughout the year. These regions get

Plenty of rainfall. An important featureof this region is the tropical rainforests.Tropical rainforests are found inWestern Ghats and Assam in India,Southeast Asia, Central America andCentral Africa.

Because of continuouswarmth and rain, this region supportswide variety of plants and animals. Themajor types of animals living in therainforests are monkeys, apes, gorillas,tigers, elephants, leopards, lizards,snakes, birds and insects.

Que. 1) What is the location of the tropical region?

(a) North pole

(b) South pole

(c) Equator

Que. 2) ………………………………………………………………..……………. is the lowest temperature in a tropical region which is not as less as it is in polar regions like Antarctica where very less life forms can thrive in the environment.

(a) 40 degree Celsius

(b) 15 degree Celsius

(c) 20 degree Celsius

(d) 37 degree Celsius

Que. 3) …………………………………………………………………………………. is the summer temperature of tropical regions.

(a) 37 degree Celsius

(c) 40 degree Celsius

(d) 20 degree Celsius

Que. 4) Name the major types of animals living in the rain forest.

Que. 5) Why does the tropical regions have hot climate?

Que. 1) (c) Equator

Que. 2) (b) 15 degree Celsius

Que. 3) (c) 40 degree Celsius

Que. 4) Answer: The major types of animals that live in rainforest are: tiger, monkey, lizards, birds, insects, apes and gorillas.

Que. 5) Answer: tropical regions have hotter climate because they are present nearer to equator where the temperature is hotter on an average.

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