NCERT Solutions for Class 7 Science Chapter 4 Heat

NCERT Solutions for Class 7 Science Chapter 4 Heat are part of NCERT Solutions for Class 7 Science. Here we have given NCERT Solutions for Class 7 Science Chapter 4 Heat.

Board	CBSE
Textbook	NCERT
Class	Class 7
Subject	Science
Chapter	Chapter 4
Chapter Name	Heat
Number of Questions Solved	11
Category	NCERT Solutions

NCERT Solutions for Class 7 Science Chapter 4 Heat

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

• Both consist of a long, narrow, and uniform glass tube.
• Both have a bulb at one end.
• Both contain mercury in the bulb.
• Both contain a Celsius scale on the glass tube.

Differences:

• A clinical thermometer shows temperature range from 35°C to 42°C, while a laboratory thermometer shows ranges between -10°C to 110°C.
• The clinical thermometer has a kink near the bulb while there is no kink in the laboratory thermometer.

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

1. Conductors—steel
2. copper Insulators—wood, plastic.

Question 3.
Fill in the blanks:

1. The hotness of an object is determined by its …….
2. The 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. It transfers heat to its other end by the process of ………
6. Clothes of ……….. colours absorb heat better than clothes of light colours.

Solution:

1. temperature
2. clinical
3. Celsius
4. radiation
5. conduction
6. dark

Question 4.
Match the following:

1.  Land breeze blows during
2.  Sea breeze blows during
3.  Dark coloured clothes are preferred during
4. Light coloured clothes are preferred during

Solution:
1-(d)
2-(c)
3-(b)
4-(a).

Question 5.
Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing?
Solution:
Wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing because the air trapped between the two layers of clothes. This air prevents the flow of the heat from our body to the cold surroundings.

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

Solution:

Question 7.
In places of the hot climate, it is advised that the outer walls of houses be painted white. Explain.
Solution:
The white colour reflects most of the heat that falls on it. When the outer walls of the houses in the places of hot climate are painted white, they reflect the heat falling on them and thus help in keeping the houses cool.

Question 8.
One liter of water at 30°C is mixed with one liter 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 20°C
(c) between 30°C and 50°C
(d) between 30°C and 50°C
Solution:
(d) between 30°C and 50°C

Question 9.
An iron ball at 40°C is dropped in a mug containing water at 40°C. The heat will
(a) flow from the 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:
(b) not flow from iron ball to water or from water to iron ball.

Question 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:
(d) does not become cold.

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

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