NCERT Solutions for Class 7 Science Chapter 4 Heat

Edited By Vishal kumar | Updated on Feb 16, 2024 06:01 PM IST

NCERT solutions for class 7 science chapter 4 Heat - Cass 7th science chapter 4 question answer are part of NCERT Solutions for Class 7 Science. How do we know whether an object is hot or cold? Hot and cold are relative terms. That is one can say that ice is cold compared to water or water is hot compared to ice. The NCERT solutions for Class 7 Science chapter 4 Heat discuss questions related to the concepts of heat and temperature. Temperature is the measure of hotness and a thermometer is used to measure temperature.

This Story also Contains

NCERT Solutions for Class 7 Science Chapter 4 Heat: Exercise Solution
Class 7 Science Chapter 4 NCERT Solutions: Important Formulas and Points
Key Features of Heat Class 7 Questions and Answers

NCERT solutions for Class 7 Science chapter 4 Heat have questions related to different types of thermometer. That is clinical and laboratory thermometer. A clinical thermometer is used to measure our body temperature. The normal temperature of the human body is 37°C and the range of the clinical thermometer is from 35°C to 42°C. For other temperature measurements, laboratory thermometers are used. The range of these thermometers is usually from –10°C to 110°C. How temperature is measured using a thermometer, how heat is transferred through convection, conduction, and radiation, and what is sea breeze and land breeze, etc; NCERT Class 7 chapter Heat gives answers to all these questions.

The NCERT solutions for Class 7 Science chapter 4 Heat covers questions from all the topics covered in the chapter. At the end of each chapter, there are exercise questions for practice. Try to solve these questions and if any doubt arises refer to NCERT Solutions for the respective chapter. Students are recommended to go through NCERT Solutions for Class 7 to score high marks in their examination.

**As per the CBSE Syllabus 2023-24, this chapter has been renumbered as Chapter 3 in Class 7 Science.

Free download class 7 science chapter 4 question answer PDF for CBSE exam.

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

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NCERT Solutions for Class 7 Science Chapter 4 Heat: Exercise Solution

Answer:

Similarities:-
i) In both laboratory thermometer and clinical thermometer, mercury is used

ii) Both laboratory and clinical thermometer consist of a long, narrow uniform tube of glass.

Differences:-

i) The least count of both the thermometer is different.

ii) Range of the temperature in a laboratory thermometer is from $-10\degree C \ to \ 110\degree C$ whereas in clinical thermometer, it is from $35\degree C \ to \ 42\degree C$

iii) Clinical thermometer is used to measure body temperature whereas laboratory thermometer is not used for such purposes

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

Answer:

Two examples of

i) Conductor :-
1) Copper
2) Aluminium

ii) insulator:-
1) Plastic
2) 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.

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 celsius.

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 :

(i) Land breeze blows during (a) summer

(ii) Sea breeze blows during (b) winter

(iii) Dark coloured clothes are preferred during (c) day

(iv) Light coloured clothes are preferred during (d) night

Answer:

These are the correct match

i) Land breeze blows durin $\rightarrow$ (d) night

ii) Sea breeze blows during $\rightarrow$ (c) day

iii) Dark coloured clothes are preferred during $\rightarrow$ (b) winter

iv) Light coloured clothes are preferred during $\rightarrow$ (a) summer

4. Match the following : (i) Land breeze blows during (a) summer (ii) Sea breeze blows during (b) winter (iii) Dark coloured clothes are preferred during (c) day (iv) Light coloured clothes are preferred during (d) night

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

Answer:

During winters, wearing more layers of clothing keeps us warmer more than compared to wearing just one thick piece of clothing because air gets trapped in between the layers of various clothes and as being a bad conductor of heat, air prevents heat loss from our body.

Because of that, wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing.

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

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Answer:

Three stages are:-

i) Transfer of heat from the burner to the pan takes place through radiation.

ii) Transfer of heat from the pan to water is taking place through conduction.

iii) Transfer of heat within water is take place through convection.

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 that the outer walls of houses be painted white because white is a light colour and because of that it reflects back most of the heat that falls on it and a very less amount of heat is absorbed by the walls.
Therefore, a light colour tends to keep 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

Answer:

If one litre of water at $30\degree C$ is mixed with one litre of water at $50\degree C$ . Then, the temperature of the mixture will be

(d) between $30\degree C$ and $50\degree C$

Because as the volume of both the liquids with temperature $30\degree C$ and $50\degree C$ is equal. Therefore, when we add both the liquids there is transferred of heat take place from a liquid with high temperature to a liquid with a low temperature. That's why temperature is between $30\degree C$ and $50\degree C$

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.

Answer:

If an iron ball at $40\degree C$ is dropped in a mug containing water at $40\degree C$ . Then, the heat will

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

Because heat will flow from an object with high temperature to an object having a low temperature. But here the temperature of both liquid and iron ball is the same.
Therefore, no flow of heat takes place

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:

If a wooden spoon is dipped in a cup of ice cream. Then, its other end

(d) does not become cold.

Because wood is a bad conductor of heat.
Therefore, no or very very less transfer of heat takes place.

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:

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

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

class 7 science chapter 4 question answer contains a total of eleven questions, including MCQs, fill in the blanks, and short answer types of questions. These questions have been prepared by experts of Careers360 and are designed to test the student's understanding of the chapter. Students can also download the PDF version of the class 7 chapter 4 science solutions and use them offline for their convenience. Additionally, practising these questions can help students to improve their knowledge and gain confidence in the subject. It is always recommended to solve such questions to ace the exams and achieve good grades.

Chapter Wise NCERT Solutions of Class 7 Science

Chapter 1	Nutrition in Plants
Chapter 2	Nutrition in Animals
Chapter 3	Fibre to Fabric
Chapter 4	NCERT solutions for class 7 science chapter 4 Heat
Chapter 5	Acids, Bases and Salts
Chapter 6	Physical and Chemical Changes
Chapter 7	Weather, Climate and Adaptations of Animals to Climate
Chapter 8	Winds, storms and cyclones
Chapter 9	Soil
Chapter 10	Respiration in Organisms
Chapter 11	Transportation in Animals and Plants
Chapter 12	Reproduction in Plants
Chapter 13	Motion and Time
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

Class 7 Science Chapter 4 NCERT Solutions: Important Formulas and Points

What is Heat?

Heat is a form of energy that flows from a hotter object to a colder object.
It is measured in units called calories or joules.

Sources of Heat

Heat can be generated from various sources, including the Sun, chemical reactions, electrical appliances, and friction.

Expansion and Contraction

Most substances expand when heated and contract when cooled. This property is used in devices like thermometers and bimetallic strips.

Conduction

Conduction is the process of heat transfer through direct contact between particles.
Good conductors (e.g., metals) transfer heat quickly, while poor conductors (e.g., wood, air) transfer heat slowly.

Clinical Thermometer

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A clinical thermometer is a specialized thermometer designed for measuring human body temperature. Here are some key features and information about clinical thermometers:

1. Temperature Range

Clinical thermometers have a limited temperature range typically between 35°C to 42°C (or 95°F to 108°F). This range covers the normal body temperature of humans.

2. Mercury or Digital

Traditional clinical thermometers contain a small amount of mercury in a sealed glass tube. When the temperature changes, the mercury expands or contracts, indicating the temperature on a calibrated scale.
Digital clinical thermometers use electronic sensors to measure temperature and display the reading on a digital screen. They are safer and more convenient to use.

3. Bulb and Capillary Tube:

The bottom of a clinical thermometer has a bulb filled with mercury (or another temperature-sensitive liquid).
Above the bulb, there is a capillary tube that contains the mercury and expands or contracts with temperature changes.

4. Kink or Loop:

To prevent the mercury from flowing back into the bulb after measurement, clinical thermometers have a kink or loop in the capillary tube.
This design ensures that the highest temperature reached during measurement is retained until the thermometer is reset

Heat Class 7 Science Chapter 4-Topics

Topics for class 7 science chapter 4 ncert solutions are given below:

Hot and Cold
Measuring Temperature
Reading a Thermometer
Laboratory Thermometer
Transfer of Heat
Kinds of Clothes We Wear in Summer and Winter
Woollen Clothes Keep Us Warm in Winter

Importance of NCERT solutions for Class 7 Science chapter 4 Heat:

An exactly similar or similar type of questions from NCERT book may appear in the class exams. So it is important to go through these questions. In the chapter heat, there are 11 exercise questions and the NCERT solutions for Class 7 Science chapter 4 Heat explains all these questions.
For school students, teachers may give homework every day. The NCERT solutions for Class 7 Science chapter 4 Heat helps to solve homework problems related to the chapter.

Key Features of Heat Class 7 Questions and Answers

Comprehensive Coverage: The heat class 7 solutions cover all the questions and exercises in Chapter 4 of the NCERT Class 7 Science textbook.
Step-by-Step Explanations: Each heat class 7 ncert solutions is explained in a step-by-step manner, making it easier for students to understand and follow.
Clear and Concise Language: The class 7 heat ncert solutions are presented in clear and concise language, making complex concepts more accessible to students.
Real-Life Examples: The heat class 7 questions and answers often provide real-life examples to help students relate scientific concepts to everyday situations.
Diagrams and Illustrations: Wherever necessary, diagrams and illustrations are included to aid visual understanding and enhance clarity.
Conceptual Clarity: Emphasis is placed on building a strong conceptual foundation, helping students understand the underlying principles of heat.
Alignment with CBSE Syllabus: The science chapter 4 class 7 solutions are designed to align with the CBSE curriculum, ensuring relevance for school exams.
Homework and Exam Preparation: These class 7 science ch 4 question answer are valuable resources for completing homework assignments and preparing for exams.

NCERT Solutions for Class 7 Subject Wise

NCERT Solutions for Class 7 Maths

NCERT Solutions for Class 7 Science

Also Check NCERT Books and NCERT Syllabus here

Frequently Asked Questions (FAQs)

1. Whether the Class 7 Science Chapter 4 Heat is useful in higher studies ?

Yes, this chapter is very important for higher studies in the field of science and physics. It is also in Class 111 NCERT Physics and Chemistry Book

2. Write the use of thermometer.

The thermometer is a device used to measure the temperature

3. How many questions in NCERT Solutions for Class 7 Science chapter 4?

There are 11 questions in NCERT Solution Class 7 Science chapter 4

Also Read

NCERT Solutions for Class 7 Science Chapter 18 Wastewater Story

NCERT Solutions for Class 7 Science Chapter 17 Forests Our Lifeline

NCERT Solutions for Class 7 Science Chapter 16 Water A Precious Resource

NCERT Solutions for Class 7 Science Chapter 14 Electric Current and Its Effects

NCERT Solutions for Class 7 Science Chapter 13 Motion and Time

NCERT Solutions for Class 7 Science Chapter 12 Reproduction in Plants

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