NCERT Solutions for Class 7 Science Chapter 4 Heat

NCERT Solutions for Class 7 Science Chapter 4 can help you a lot if you want to understand the concept of heat deeply. These solutions give step-by-step and simple answers to all textbook questions and make your revision sessions effective. By studying with these Class 7 Heat NCERT solutions, you can clear your doubts and prepare confidently for your exams.

Chapter 4 of Class 7 Science, named Heat, teaches about how heat moves from one object to another through conduction, convection, and radiation. It also explains the difference between temperature and heat, how thermometers are used to measure temperature, and what makes a material a good conductor or insulator. You'll also learn some interesting facts, like why dark clothes absorb more heat or how wearing layers of clothes keeps us warm in winter.

NCERT Solutions for Class 7 Science Chapter 4 Heat include all exercise question answers to help you better understand the key concepts from this chapter. So, keep reading to go through all the important science chapter 4 class 7 question answers.

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NCERT Solutions for Class 7 Science Chapter 4

NCERT Solutions for Class 7 Science Chapter 4 Heat makes learning about heat interesting for you by explaining how heat is measured, transferred, and used in our daily lives. Since Heat is a very important part of science, understanding these key concepts now will not only help you in exams but also in higher classes. The following Class 7 heat NCERT solutions are written simply to make it easier for you to understand and revise.

Class 7 Science Chapter 4 Heat Question Answers: Exercise 1

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

Solution: Similarities between the laboratory thermometer and the clinical thermometer

1. Laboratory thermometers and the clinical thermometer thermometers consist of long, narrow, uniform glass tubes.

2. Laboratory thermometer and the clinical thermometer have a bulb at one end.

3. Laboratory thermometer and the clinical thermometer contain mercury in the bulb.

4. Laboratory thermometer and the clinical thermometer use the Celsius scale on the glass tube.

Differences between the laboratory thermometer and the clinical thermometer:

A clinical thermometer reads temperature 35°C to 45°C, while the range of a laboratory thermometer is -10°C to 110°C.

The clinical thermometer has a kink near the bulb, while there is no kink in the laboratory thermometer. Due to the kink, mercury does not fall down on its own in a clinical thermometer.

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

Solution:

• Conductors: Silver, copper

• Insulators: Rubber, plastic.

Question 3: Complete the sentence with appropriate answers:

1. _______ can determine an object’s hotness.

2. ______Thermometer cannot be used to measure the temperature present in boiling water.

3. _____Degree is used to measure temperature.

4. ___________ requires no medium for heat transfer for the process.

5. An ice-cold steel fork is dipped into a mug of hot water. The transfer of heat to the other end is by the process of __________.

6. _______Color clothes absorb heat better than clothes of light colours.

Solutions:

1. Temperature can determine the object's hotness.

2. Clinical thermometer cannot be used to measure the temperature of boiling water.

3. Celsius degree is used to measure temperature.

4. Radiation requires no medium for heat transfer in the process.

5. An ice-cold steel fork is dipped into a mug of hot water. Transfer of heat to the other end is by the process of conduction.

6. Dark color clothes absorb heat better than clothes of light colours.

Question 4: Match the following:

Solutions:

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

Solution:  More layers of clothing actually keep us warmer in winter as they have a lot of space between them. That space gets filled up with air. Air is a bad conductor; it does not allow the body heat to escape out.

Read More: NCERT Solutions for Class 7 Science Chapter 1

Question 6: Mark the places in which the heat is being transferred by convection, conduction and by radiation.

Solution:

Question 7: Explain why buildings in places that have a hotter climate are advised to paint the outer walls white.

Solution: Since the white colour reflects heat, it helps the house to not get heated up so much.

Question 8: When a litre of water at 50°C is mixed with another liter of water at 30°C what will be the temperature of the mixture?

(1) 80°C

(2) lesser than 80°C but greater than 50°C

(3) 20°C

(4) Between 50°C and 30°C

Solution:

(4) Between 50°C and 30°C

Question 9: In a mug that contains water at 40°C, an iron ball which is 40°C is dropped. Mention the flow of heat:

1. Flow from the iron ball to water.

2. Will not flow from water to iron ball or from iron ball to water.

3. Will flow from the water to the iron ball.

4. Both the temperatures increase.

Solution: (2) Will not flow from water to iron ball or from iron ball to water.

Question 10: A wooden fork is dipped in a bowl of ice-cold water, and its other end:

1 .Becomes cold due to the process of convection

2 .becomes cold due to the process of radiation

3 .becomes cold due to the process of conduction

4 .Doesn’t become cold.

Solution: (4) Doesn’t become cold.

Read More: NCERT Solutions for Class 7 Science Chapter 2

Question 11: Why are stainless steel pans that we use at home provided with copper bottoms? The reason might be:

1. Such type of pans appear to be colorful

2. Copper is a much better conductor of heat than that of stainless steel.

3. Copper is much easier to clean after use when compared to that stainless steel

4. Copper bottoms in pans are more durable.

Answer: (2) Copper is a much better conductor of heat than that of stainless steel.

Heat Chapter Class 7 Questions and Answers: Extended Learning - Activities and Projects

Question 1: Go to a doctor or your nearest health centre. Observe the doctor taking temperature of patients. Enquire:

Answer:

1. Why she dips the thermometer in a liquid before use.

2. Why the thermometer is kept under the tongue.

3. Whether the body temperature can be measured by keeping the thermometer at some place other than the mouth.

4. Whether the temperature of different parts of the body is the same or different.

You can add more questions which come to your mind.

Question 2: Go to a veterinary doctor (a doctor who treats animals). Discuss and find out the normal temperature of domestic animals and birds.

Solution:

The normal temperature of domestic animals and birds is recorded as follows:

The normal temperature of a Goat varies from 37 0 - 40 0 C.

The normal temperature of a dog is about 38.3 0 C

The normal temperature of a pigeon (bird) is 40 0 C.

The normal temperature of a cat is 38 0 C

Question 3: Wrap a thin paper strip tightly around an iron rod. Try to burn the paper with a candle while rotating the iron rod continuously. Does it burn? Explain your observation.

Answer:  The paper will not be burnt while rotating the iron rod continuously because iron, being a good conductor of heat, allows heat to pass through them. As a result, heat is taken away from the paper, and the paper doesn’t burn.

Question 4: Take a sheet of paper. Draw a spiral on it as shown in the Fig. 4.14. Cut out the paper along the line. Suspend the paper as shown in Fig. 4.14 above a lighted candle. Observe what happens. Think of an explanation.

Solution: When the spiral paper is suspended at flame, then the paper spiral will keep moving because, due to the convection process, there will be a transfer of heat, and the air present above the flame will move up, which results in the movement of the paper spiral.

Question 5: Take two similar transparent glasses of bottles having wide mouths. Put a few crystals of potassium permanganate or pour a few drops of ink in the bottle. Fill this bottle with hot water. Fill the other bottle with cold water. Cover the cold water bottle with a thick piece of paper such as a post card. Press the post card firmly with one hand and hold the bottle with the other hand. Invert the bottle and place it on top of the hot water bottle. Hold both the bottles firmly. Ask some other person to pull the post card. Observe what happens. Explain.

Solution: When the card will be removed, then due to diffusion process there will be movement of colored hot water in upward direction and cold water in downward direction. It happened because hot fluid i.e. hot water is lighter than the cold water.

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Benefits of the Class 7 Science Chapter 4 Question Answer

Studying class 7 science chapter 4 question answers helps you understand the topic of Heat in an efficient way. It also makes your revision easy and helps you score better marks in exams. Here are some main benefits:

• Helps you understand how heat moves through conduction, convection, and radiation.

• Makes it easy for you to remember important definitions and formulas about temperature and thermometers.

• These class 7 science chapter 4 heat question answers improve your answer-writing skills with clear and simple explanations.

• Builds your confidence by giving well-structured heat chapter class 7 questions and answers.

• Motivates you to think logically and relate what you learn in the classroom to real-life examples.

• Saves your time during revision since all important Class 7 science heat question answers are covered in one place.

NCERT Class 7 Science Chapter 4 Heat: Brief Summary

Class 7 Science Chapter 4 Heat explains how heat is a form of energy that moves from a hot object to a cold one. The chapter also helps you understand temperature, thermometers, and how heat travels in different ways. Here are the key concepts explained in this chapter:

1. Heat

Heat is a kind of energy that makes things warm. It always flows from something hot to something cold. For example, when you touch a metal spoon kept in hot soup, it also becomes hot.

2. Temperature and Thermometers

Temperature tells us how hot or cold an object is. It is measured using a thermometer.

• Clinical Thermometer: Used by doctors to measure body temperature. Its range is from 35°C to 42°C.

• Laboratory Thermometer: Used in labs to measure the temperature of liquids or other objects. Its range is from -10°C to 110°C.

3. Transfer of Heat

Heat can move in three different ways:

• Conduction: Happens in solids when heat passes through direct contact. Example: a hot pan handle.

• Convection: Happens in liquids and gases when warm air or water rises and cool air or water moves down. Example: boiling water.

• Radiation: Happens without any contact or medium. Example: feeling the sun’s warmth on your skin.

4. Conductors and Insulators

• Conductors are materials that allow heat to pass through easily, like iron, copper, or steel.

• Insulators do not let heat pass through easily, like wood, plastic, or wool.

5. Sea Breeze and Land Breeze

• Sea Breeze: During the day, the land gets hot faster. Cool air from the sea moves toward the land.

• Land Breeze: At night, the land cools faster, and cool air moves from the land toward the sea.

6. Clothes and Heat

We wear dark-coloured clothes in winter because they absorb more heat and keep us warm. In summer, we wear light-coloured clothes because they reflect heat and keep us cool. Woollen clothes also keep us warm by trapping air, which does not allow heat to escape.

Understanding the summary is very important because it helps you learn the important concepts from the chapter in a simple way. When you know how heat moves, how temperature is measured, and how it affects our daily life, it becomes easy for you to answer questions correctly. A deeper understanding of this also helps you use the NCERT Solutions for Class 7 Science Chapter 4 better, as you can easily connect the answers with the concepts.

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NCERT Solutions for Class 7 Science Chapter 4 FAQs

Q.1. What is heat?

Ans. Heat is a form of energy that moves from a hot object to a cold one. It is the reason why things around us feel warm or cold. The temperature of an object shows how much heat it has, and it can be measured using a thermometer.

Q.2. Do class 7 heat NCERT solutions help score well in exams?

Ans. Yes, the class 7 heat NCERT solutions are very helpful for exam preparation. They explain each question simply so that you can easily understand the concepts. By studying these solutions, you can revise quickly, clear your doubts, and write accurate answers in your exams.

Q.3. What are conductors and insulators?

Ans. Conductors are materials that allow heat to pass through them easily, like iron, copper, or steel. Insulators are materials that do not allow heat to pass through easily, such as wood, plastic, or wool. Understanding these helps you know why cooking utensils have metal bases and plastic handles.

Q.4. Where can I get NCERT Solutions for Class 7 Science Chapter 4?

Ans. You can find NCERT Solutions for Class 7 Science Chapter 4 Heat in the article above. These solutions are written in very simple words to help you understand the main concepts of heat, temperature, and heat transfer.

Q.5. What key topics are covered in the science chapter 4 class 7 question answers?

Ans. The science chapter 4 class 7 question answers cover important topics such as hot and cold, measuring temperature, the use of thermometers, the transfer of heat through conduction, convection, and radiation, and how clothes help us stay warm or cool in different seasons. These topics help you build a strong understanding of how heat works in real life.