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CBSE 7th Standard Science Heat Model Questions Papers Study Material - QB365 Set A

Published on: 31/10/2025

Question Set A

CBSE 7th Standard Science Heat Model Questions Papers Study Material - QB365

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Std: 7th Standard CBSE - Science

chapter: Heat - Model Questions Papers

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Questions:

Generic 3

5 x 3 = 15

Explain the reason for wrapping of ice in gunny bags.

Briefly explain, why do the kites and eagles fly without flapping their wings.

The freezer is located at the top of the refrigerator. Explain why.

Observe the picture given in figure. Water is being boiled in a pan of wide base.
(a) Which position P or T will feel warmer?
(b) Fill up the boxes P and T to indicate the mode of flow of heat to the hand.

Give two examples each of conductors and insulators of heat.

Match the following

5 x 1 = 5

Thermometer

Dark coloured surfaces

Conductors

Convection

10.

Land breeze blows during

Generic 2

4 x 2 = 8

11.

You may have noticed that a few sharp jerks are given to clinical thermometer before using it. Why is it done so?

12.

How can we measure the temperature of other object rather than human body?

13.

Why is it advised not to hold the thermometer by its bulb while reading it?

14.

A laboratory thermometer A is kept 7 cm away on the side of the flame while a similar thermometer B is kept 7 cm above the flame of a candle as shown in figure. Which of the thermometers A or B will show a greater rise in temperature? Give reason for your answer.

Generic 5

2 x 5 = 10

15.

Last Sunday, Pooja on her week off entered in her kitchen to cook rice for her family in lunch time. The moment she put fry pan on the gas stove and lighted it through the matchstick, all of sudden her 5 years small daughter entered into the kitchen and tends to touch the hot fry pan. At the same time, Pooja saw her and pushed her away from the hot fry pan. In this way, she saved her child.
(a) Explain why do the fry pan are provided with the plastic handles?
(b) Mention the values represented by Pooja here towards her 5 years small daughter.

16.

Explain the differences between heat and temperature.

True or False

5 x 1 = 5

17.

Water and air are good conductors of heat.

(a)

True

(b)

False

18.

Shining thread in thermometer is the column of mercury.

(a)

False

(b)

True

19.

Water at higher temperature feels more hot.

(a)

False

(b)

True

20.

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

(a)

False

(b)

True

21.

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

(a)

False

(b)

True

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Answers Key:

Generic 3

5 x 3 = 15

Since, we know that gunny bags consist of number of fine pores which are filled with air. As air is a bad conductor of heat, so due to this reason, it does not allow the external heat to move inside and melts the ice.

As it is a fact that the hot air during the day time surrounds the land gradually and rises up, due to which a convection air of heat develops. So, kites and eagles start moving along this rising current of heat without flapping the wings to fly high up in the sky.

The freezer is located at the top of the refrigerator. It is because the air inside and around the compartments of freezer gets cool and move downwards and on the other side, the lesser cool air moves upward to get cooled.
So, as a result of this, convection of heat are setup in the air and the lower section of the refrigerator also gets cooled faster.

(a) As in the given diagram, position P will feel warmer because of heat, air rises.
(b) The flow of heat to P is a convection process and flow of heat to T is radiation.

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

Match the following

5 x 1 = 5

()
A device to measure the degree of hotness

()
Good absorbers of heat

()
Metals

()
Liquids

10.

()
Night

Generic 2

4 x 2 = 8

11.

Jerks are given to clinical thermometer before using it to settle down the mercury level below normal temperature so that the measurement taken of a body be accurate.

12.

Temperature of other object is measured with laboratory thermometer because clinical thermometer is not suitable for higher temperature.

13.

It is advised not to hold the thermometer bulb while reading it as the level of mercury increases from the actual reading by our body temperature.

14.

Thermometer B will show a greater rise in temperature because heated-air above the candle risesimmediatly and increase the temperature of bulb of thermometer B quite greater than A.

Generic 5

2 x 5 = 10

15.

(a) As we know that plastic is a bad conductor of heat which does not allow the heat to pass through itself. So, heat from the fry pan does not flow to the handle due to which we can hold it easily. So that's why, the fry pans are provided with the plastic handles.
(b) The value showed by Pooja here is a great concern and careness towards her five years old small daughter.

16.

The differences between heat and temperature are given as below

Heat	Temperature
It is a form of energy which flows from one body to another when there is a difference in temperature between the objects.	It is the thermal condition of a body that indicates whether or not and in which direction, heat will flow from one body to the other.
It is equal to the sum of internal energies of the molecules of a body.	It is proportional to average kinetic energy of the molecules of the body.
As a heat between two bodies, total amount of heat of two bodies remains unchanged.	As a conclusion of exchange of heat between two bodies sum of their temperatures before and after exchange is not same.
SI unit of heat is joule (J).	SI unit of temperature is kelvin (K).