NCERT Solutions For Class 7 Science Chapter 4 – Heat

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 Chapter 4 Heat is one of the most crucial chapters in Class 7 Science. Heat is a very basic topic that is necessary for the students to understand to score well in the exams and to face bigger challenges in the future.

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Exercise Questions

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

Solution:

Similarities

• Both are made of glass and consist of 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 thermometer

Differences

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

Solution:

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 more heat better than clothes of light colours.

Solution:

(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.

4. Match the following : (d) night

Solution:

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

Solution:

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.

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

Solution:

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

Solution:

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

Solution:

The temperature of the mixture will be between 30°C and 50°C because hot water loses the 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 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.

Solution:

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

Solution:

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.

Solution:

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

Introduction to NCERT Solutions Class 7 Science Chapter 4 Heat

This chapter focuses on questions regarding heat and measurement of heat. We will see questions on the difference between clinical and laboratory thermometer. 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 have fill in the blanks questions where you have to fill the appropriate words to make the sentences meaningful. This chapter consists of a special type of questions for easier understanding.

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

1. Hot and cold
2. Temperature measurement
3. Thermometers
4. Heat transfer
5. Clothes in  different climatic conditions

In NCERT books, you can find extra questions for Class 7 science heat after the end of each chapter. CoolGyan’S experts provide answers to NCERT exemplar problems which will help you understand the topic and helps to crack your competitive exams.

We have a match the following type questions (MCQs) which will enable you to match the correct answers to the right statements. Have you wondered why wearing multiple layers of clothes in winter makes you stay warm? Find out the answers why here in the NCERT Solutions for Class 7 Science. You will be given an image where you have to mark the places where conduction, convection and radiation happens.

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