CBSE Class 7 Science Exemplar Chapter 4 Heat NCERT Solutions

Reviewed by NCERT Help Editorial Team · Updated on 29 Jul 2026

NCERT Solutions PDF Class 7 PDF

CBSE Class 7 Science Chapter 4 Solutions introduce the fascinating world of Heat. This chapter explores how heat travels through different materials, distinguishing between conductors that allow heat to pass easily and insulators that resist it. You'll learn about the crucial concept of temperature measurement, understanding how thermometers work and the different scales used to read them. These solutions break down complex ideas into simple, easy-to-understand explanations, making it easier for you to grasp the fundamental principles of heat and temperature. They are designed to help you prepare thoroughly for your exams by reinforcing your understanding and providing practice in solving related problems.

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Board	CBSE
Class	Class 7
Subject	Science Exemplar
Session	2026
Language	English
Type	NCERT Solutions
Chapter	Chapter 4

Chapter summary

Chapter 4 of the CBSE Class 7 Science Exemplar, focusing on Heat, is explained through these NCERT Solutions. The solutions cover the properties of conductors and insulators, explaining why certain materials feel hotter or colder. They also address the measurement of temperature, differentiating between clinical and laboratory thermometers and the Celsius and Fahrenheit scales. The exercises focus on applying these concepts to real-world scenarios and understanding accurate temperature readings.

Learning outcomes

Understand the difference between conductors and insulators of heat.
Explain why certain objects feel colder or warmer than others.
Identify the appropriate thermometer for measuring body temperature and boiling water.
Compare and contrast different temperature scales (Celsius and Fahrenheit).
Solve problems related to heat transfer and temperature measurement.

Topics covered

Paper topics

Heat
Temperature
Conductors
Insulators
Heat Transfer
Clinical Thermometer
Laboratory Thermometer
Celsius Scale
Fahrenheit Scale
Body Temperature Measurement

Important topics

Conductors vs. Insulators
Choosing the Right Thermometer
Temperature Scales
Heat Transfer Mechanisms

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Questions and Solutions

Multiple Choice Questions

1. 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.

(d) is a poor conductor of heat than the wooden tile.

Solution: The correct option is (a). Marble is a better conductor of heat than wood. This means that marble transfers heat away from your hand more quickly than wood does. On a cold morning, both tiles are at a lower temperature than your body. When you touch the marble, it rapidly draws heat from your hand, making it feel cold. The wooden tile, being a poorer conductor, draws heat away more slowly, so it feels warmer in comparison.

2. 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.

(d) newspaper is at a higher temperature than the temperature of the surrounding.

Solution: The correct option is (b). Newspaper is a relatively poor conductor of heat. When multiple layers are used, air gets trapped between them. Air is an excellent insulator, meaning it is a very bad conductor of heat. This trapped air prevents the body heat from escaping into the cold surroundings, helping the beggar stay warm.

3. Paheli and Boojho measured their body temperature. Paheli found her's to be 98.6 °F and Boojho recorded 37°C. Which of the following statement is true?

(a) Paheli has a higher body temperature than Boojho.

(b) Paheli has a lower body temperature than Boojho.

(d) Both are suffering from fever.

Solution: The correct option is (c). The normal human body temperature is considered to be around 37°C. The Fahrenheit scale is another unit for measuring temperature, and 37°C is equivalent to 98.6°F. Since both Paheli and Boojho recorded temperatures that are equivalent to the normal human body temperature, they both have normal body temperatures.

4. Boojho has three thermometers as shown in Figure 4.1. He wants to measure the temperature of his body and that of boiling water. Which thermometer(s) should he choose?

(i) A thermometer with a range from 35°C to 42°C.

(ii) A thermometer with a range from -10°C to 110°C.

(iii) A thermometer with a range from 0°C to 100°C.

Possible choices:

(a) Thermometer (i) or (iii) for measuring body temperature and (ii) for measuring the temperature of boiling water.

(b) Thermometer (i) for measuring temperature of both.

(d) Thermometer (iii) for measuring temperature of both.

(Note: Figure 4.1 shows three thermometers with different ranges. Thermometer (i) shows 35-42°C, thermometer (ii) shows -10-110°C, and thermometer (iii) shows 0-100°C.)

Solution: The correct option is (a). Human body temperature typically ranges from about 35°C to 42°C. Therefore, thermometer (i) or thermometer (iii) (which covers this range) can be used to measure body temperature. Boiling water has a temperature of 100°C at standard atmospheric pressure. Thermometer (ii) has a range of -10°C to 110°C, which is suitable for measuring the temperature of boiling water. Thermometer (iii) can also measure boiling water, but thermometer (ii) is more versatile for both very cold and boiling temperatures.

5. Four arrangements to measure the temperature of ice in a beaker with a laboratory thermometer are shown in Figure 4.2 (a, b, c and d). Which one of them shows the correct arrangement for accurate measurement of temperature?

(Note: Figure 4.2 would typically show four diagrams illustrating different ways to place a thermometer in ice. The correct method involves the thermometer bulb being fully immersed in the substance being measured, not touching the bottom or sides of the container.)

Solution: For an accurate measurement of the temperature of ice using a laboratory thermometer, the thermometer bulb must be completely immersed in the ice. It should not touch the bottom or the sides of the beaker. This ensures that the thermometer is measuring the temperature of the ice itself and not the temperature of the beaker or the surrounding air. Typically, diagram (a) or (d) in such figures would represent the correct arrangement where the bulb is fully surrounded by the ice.

Common mistakes

Confusing conductors and insulators.
Incorrectly selecting a thermometer for a specific temperature range.
Misinterpreting temperature scales.
Not understanding the role of trapped air in insulation.

Revision tips

Review the definitions of conductors and insulators with examples.
Practice identifying the correct thermometer for different measurement needs.
Ensure you can convert between Celsius and Fahrenheit.
Focus on the explanations for why materials feel hot or cold to the touch.

Practice MCQs

Q1. Why does a marble tile feel colder than a wooden tile on a cold morning?

Q2. Why do beggars wrap themselves in multiple layers of newspaper on cold nights?

Q3. If Paheli's body temperature is 98.6°F and Boojho's is 37°C, what can be concluded?

Q4. Which type of thermometer is generally used for measuring body temperature?

Q5. What is the primary function of the kink in a clinical thermometer?

Frequently asked questions

What is the main difference between conductors and insulators?

Conductors allow heat to pass through them easily, while insulators resist the flow of heat.

Which thermometer should be used to measure the temperature of boiling water?

A laboratory thermometer (like thermometer (ii) in Figure 4.1) should be used to measure the temperature of boiling water, as it has a wider range than a clinical thermometer.

What is considered normal human body temperature?

Normal human body temperature is approximately 37°C or 98.6°F.

How does layering of newspapers help in cold weather?

The layers trap air, which is a poor conductor of heat, thus insulating the body and preventing heat loss.

Can a clinical thermometer measure the temperature of boiling water?

No, a clinical thermometer is designed for measuring body temperature and has a limited range. It cannot measure the high temperature of boiling water.

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