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CBSE 7th Standard Science Heat Important Questions And Answers Study Material - QB365 Set B

Published on: 31/10/2025

Question Set B

CBSE 7th Standard Science Heat Important Questions And Answers Study Material - QB365

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Std: 7th Standard CBSE - Science

chapter: Heat - Important Questions And Answers

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Questions:

Generic 3

4 x 3 = 12

What precautions are needed while reading a laboratory thermometer?

Instead of water explain the reason, why do the mercury is used in the thermometer?

Differentiate between two modes of transfer of heat, i.e. convection and conduction.

Give two examples each of conductors and insulators of heat.

Multiple Choice Question

5 x 1 = 5

Cooking utensils are made of metals because they are:

(a)

Durable

(b)

Malleable

(c)

Good conductors of heat

(d)

Do not break on heating

Heat is a form of:

(a)

Energy

(b)

Light

(c)

Electricity

(d)

Work

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

(c)

reflects more heat than wooden tile

(d)

is a poor conductor of heat than the wooden tile

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

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

Generic 2

5 x 2 = 10

10.

Why ice is wrapped in gunny bags?

11.

What are insulators?

12.

Why convection is not possible in solids?

13.

Shopkeepers selling ice blocks usually cover them with jute sacks. Explain why.

14.

In a mercury thermometer, the level of mercury rises when its bulb comes in contact with a hot object. What is the reason for this rise in the level of mercury?

Generic 5

2 x 5 = 10

15.

Explain the sea breeze and land breeze.

16.

On last Monday, Pankaj was dealing immense cough and cold. Besides this, he was suffering from a great headache. So, he decided to take a leave on that day so that he could take some rest at his home. After one hour he thought to check his fever through a clinical thermometer, so before using it, he washed it and started shaking it very fastly in his hand, so that the mercury level of thermometer gets reduced. At the same time, his elder brother Vishwas scold him and suggested him to shake thet hermometer slowly.
(a) State some precautionary measures while checking the fever through a clinical thermometer.
(b) Mention the values showed by the elder brother of Pankaj ( i.e. Vishwas).

Fill up / 1 Marks

5 x 1 = 5

17.

The three modes of heat transfer are radiation ________ and conduction.

18.

All hot bodies radiate _______

19.

When we come out in the sun, we feel ______

20.

In coastal areas, cold air flows in the day from sea to land. It is called ______

21.

Temperature is the measure of _____ of an object.

True or False

5 x 1 = 5

22.

Marking on clinical thermometer is from 0⁰C to 100⁰C.

(a)

True

(b)

False

23.

Water at higher temperature feels more hot.

(a)

False

(b)

True

24.

In all cases, heat flows from a hotter object to a colder object.

(a)

False

(b)

True

25.

Normal temperature of human body is 98.6°C.

(a)

True

(b)

False

26.

Our sense of touch about hotness or coldness is not always reliable

(a)

False

(b)

True

Match the following

5 x 1 = 5

27.

Movement of molecules of liquid

28.

Water and air

29.

Thermometer

30.

Light coloured surfaces

31.

Dark coloured surfaces

1 Marks

5 x 1 = 5

32.

Do all liquids expand on heating?

33.

Which is the bad conductor of heat?

34.

Name the three modes of transfer of heat.

35.

What is the SI unit of temperature.

36.

Which metal is used in the bulb of thermometer?

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Answers Key:

Generic 3

4 x 3 = 12

(i) The thermometer should be kept upright not tilted.
(ii) Bulb should be surrounded from all sides by the substance by which the temperature is to be measured.
(iii) The bulb should not touch the surface of the container.

Due to following reasons, mercury is used in the thermometers instead of water
(i) When the thermometer breaks, the mercury can be easily collected.
(ii) Mercury can has more expansion than the water.
(iii) Also, mercury do not stick on the walls of thermometer like water.

Difference between convection and conduction

Conduction	Convection
The mode of transfer of heat from the hotter part of a material to its colder part or from a hot material to a cold material in contact with it without the movement of material as a whole. So, this phenomenon is known as conduction.	The mode of transfer of heat from the hotter part a fluid to its colder parts by the movement of liquid itself. So, this phenomenon is known as convection.
In all the solids, heat is transferred by the process of conduction.	In all the liquids and gases, heat is transferred by the process of convection.

Examples of conductors are metal and steel and examples of insulators are wood and plastic.

Multiple Choice Question

5 x 1 = 5

(a)
Energy

(a)
is a better conductor of heat than the wooden tile

As copper is a better conductor of heat than the stainless steel. So, stainless steel pans are usually provided with copper bottom.

As heat can only flow from higher temperature to lower temperature. Thus, the heat will not flow from iron ball to water or vice-versa.

Generic 2

5 x 2 = 10

10.

Gunny bags have a number of fine pores filled with air. Air being a bad conductor of heat does not allow heat from outside to go to the ice and melt it.

11.

Materials which do not allow heat to pass through them easily are poor conductors of heat and are called insulators. e.g., wood, plastic.

12.

The molecules of solid are held strongly due to intermolecular forces and thus cannot move from one place to another place of the solid. So, convection is not possible in solids.

13.

As we know that jute sacks is thermal insulators, it helps ice not to be melt immediately. So, shopkeepers used to cover ice blocks with jute sacks.

14.

As the temperature increases, then expansion in mercury takes place which leads to the rise in the level of mercury in thermometer.

Generic 5

2 x 5 = 10

15.

At sea-shore during the day cold air from the sea moves towards the beach because the land gets more heated than the sea water. Hot air above the land rises up, and cold air from the sea moves towards the land beach. This is called sea breeze as shown in fig. (a).
During the night, cold air from the land moves towards the sea because the land cools more quickly than the sea water. So hot air above the sea rises up and cold air from the land moves towards the sea. This is called land breeze as shown in fig.(b).

16.

(a) The following precautionary measures while checking the fever through a clinical thermometer are
(i) While reading the clinical thermometer, it should never be held by the bulb.
(ii) The clinical thermometer should be washed properly (before and after use).
(b) The values showed by the elder brother of Pankaj, Vishwas, are concern towards the way of using the clinical thermometer and the importance of money as well.

Fill up / 1 Marks

5 x 1 = 5

17.