NCERT Solutions for Class 7 Science Chapter 3 Heat

Our NCERT Solutions for Class 7 Science Chapter 3 – Heat are designed by experienced subject teachers to match the latest CBSE syllabus for 2025-26. These solutions are written in simple and easy language so that every student can understand the concepts without difficulty. 

In the chapter, students learn about how we find out whether an object is hot or cold, how to measure temperature end it talks about the kind of clothes we wear in summer and winters. Then it covers the laboratory thermometer and transfer of heat.

These Class 7 NCERT solutions are ideal for homework help, test preparation, and building a clear understanding of the concept of heat. With step-by-step answers and smart explanations, they make science learning easier and more effective.

NCERT Solutions for Class 7 Science Chapter 3 Heat

The NCERT Solutions for Class 7 Science Chapter 3: Heat are specially designed to help students clear their doubts and develop a strong understanding of key science concepts. This chapter explains the basics of heat, temperature, methods of heat transfer, and how heat affects different materials in our daily life.

Our heat Class 7 NCERT solutions offer easy-to-follow explanations and step-by-step answers for all textbook questions, making them ideal for quick revision and exam preparation. Whether you're looking for Class 7 Science Heat question answers, revision notes, or want to create your own Class 7 Chapter 3 Science notes, these solutions will support your learning process.

The PDF format is also available for easy download and offline study. These NCERT solutions class 7 science are perfect for mastering concepts related to thermal energy, conduction, convection, and radiation. Use them to build a clear understanding and boost your confidence for exams.

NCERT Solutions for Class 7 Science Chapter 3 PDF Download

If you’re preparing for your Class 7 Science exam, then this is useful resource for you.  We are offering a free PDF download of NCERT Solutions for Class 7 Science Chapter 3 – Heat, specially designed to help students understand concepts and solve questions with ease.

This Class 7 Science Heat NCERT Solutions PDF includes accurate and simple answers to all textbook questions, making it easier for students to revise and prepare. Whether you're looking for Class 7 Science Chapter 3 Heat Question Answer PDF Download, Chapter 3 Heat notes, or practice questions with solutions, this resource is perfect for self-study and last-minute revisions.

Inside this PDF, you’ll find:

• Complete solutions to all NCERT questions.
• Easy-to-understand explanations for better clarity
• Perfect material for homework, tests, and exam revision
• Well-structured answers based on the latest CBSE syllabus

Students can download the PDF for free directly from this blog and use it anytime, anywhere to improve their understanding of heat, temperature, and heat transfer methods. It's a must-have for anyone looking to score well in Class 7 Science exams!

In below pdf we have provided NCERT class 7 science chapter 3 pdf question answer from class 7 science NCERT textbook 

NCERT Solutions for Class 7 Science Chapter 3 Questions Answers

Here, we’ve provided all the NCERT textbook questions and their detailed solutions for Chapter 3: Heat, designed for the 2025–26 academic session. These answers are designed to help students understand concepts clearly, practice effectively, and perform confidently in exams.

Class 7 Science Chapter 3 Exercise Question Answer Page No. 34-35

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

Ans. Similarities

1. Both are used to measure temperature.
2. They are made of long, narrow, uniform glass tubes with a bulb at one end.
3. Mercury is used as the measuring fluid.
4. They are marked in Celsius scale.

Differences

1. Laboratory thermometer is larger and broader compared to clinical
2. Laboratory thermometers are marked from -10°C to 110°C, while clinical thermometers are marked from 35°C to 42°C only.
3. Laboratory thermometers are used to measure the temperature of various objects in different states.
4. Clinical thermometers are specifically designed to measure human body temperature.
5. There is no kink in laboratory thermometers.
6. Clinical thermometers have a kink to prevent the mercury level from falling on its own.
7. When noting readings with a laboratory thermometer, it has to be in contact with the object whose temperature is being measured.
8. Clinical thermometer readings are observed when it is outside the body.

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

Ans. Examples of conductors: Aluminium, iron, copper, etc. Examples of insulators: Water, air, etc. 

3. Fill in the blanks :

1. The hotness of an object is determined by its __________.
2. Temperature of boiling water cannot be measured by a _____________ thermometer.
3. Temperature is measured in degree ______________.
4. No medium is required for transfer of heat by the process of __________.
5. A cold steel spoon is dipped in a cup of hot milk. Heat is transferred to its other end by the process of ______________.
6. Clothes of ______________ colours absorb heat better than clothes of light colours.

Ans.

1. How hot an object is determined by its hotness or coldness.
2. The temperature of boiling water cannot be measured by a clinical thermometer.
3. Temperature is measured in degrees of hotness (or coldness).
4. No medium is required for the transfer of heat by the process of radiation.
5. A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of conduction.
6. Clothes of dark colors absorb heat better than clothes of light color.

4. Match Column-I to Column-II

Ans.

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

A. Different layers of clothing trap air inside them. Air is a poor conductor of heat, so it prevents the flow of heat from the body to the cold surroundings and makes the body feel warm. Look at the figure. Mark where the heat is being transferred by conduction, by convection, and by radiation. 

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

Ans.

• By conduction: Heat transfer occurs from the lower surface to the upper surface of the pan.
• By convection: Heat moves from the lower box to the upper region of pan water.
• By radiation: Heat transfers from the flame to the bottom of the pan.

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

Explain. Light-coloured surfaces reflect most of the heat that falls on them, resulting in the surface remaining cooler. Therefore, it is advised to paint the outer walls of houses white in places with hot climates. 

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

1. 80°C
2. More than 50°C but less than 80°C
3. 20°C
4. Between 30°C and 50°C

Answer: d) 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

1. Heat flows from the iron ball to the water.
2. Heat does not flow from the iron ball to the water or from water to the iron ball.
3. Heat flows from the water to the iron ball.
4. The temperature of both increases.

Answer: b) Heat does not flow from the iron ball to the water or from water to the iron ball. 

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

1. Becomes cold by the process of conduction.
2. Becomes cold by the process of convection.
3. Becomes cold by the process of radiation.
4. Does not become cold.

Answer: d) Does not become cold. 

11. Reasons for Copper Bottoms on Stainless Steel Pans:

Possible Reasons:

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.

Answer: c) Copper is a better conductor of heat than stainless steel.

Important Topics covered in NCERT Solutions for Class 7 Science Chapter 3 Heat

Here are the main concepts explained in this chapter:

• Hot and Cold Objects: Learn how we feel temperature differences and how different materials can feel hot or cold.
• Measurement of Temperature: Understand how temperature is measured using thermometers and learn the difference between Celsius and Fahrenheit scales.
• Types of Thermometers: Know about clinical and laboratory thermometers and how to use them safely.
• Transfer of Heat: Explore how heat moves from one object to another—through conduction, convection, and radiation.
• Clothing in Different Seasons: Discover why we wear wool in winter and cotton in summer, and how clothes help regulate body heat based on climate.

Why Choose Infinite Learn NCERT Solutions for Class 7 Science Chapter 3?

Infinite Learn is dedicated to creating high-quality, easy-to-understand content for school students. Their NCERT Solutions for Class 7 Science are carefully designed by subject matter experts to strengthen students’ understanding and boost exam performance.

Key Benefits:

• Concept-based explanations
• Helpful for last-minute revisions
• Clear language with simple examples
• Aligned with the latest CBSE syllabus
• Developed to improve problem-solving and thinking skills