MCQ Questions

Question No. 1

State True or False for the following and correct the false statements giving reasons

Answer :

(1) Heat is a form of energy which we can see.

(2) Weight of a cold object is always less than that of a hot object.

(3) When we touch hot water heat flows from water to our hand.

(4) Molecules of hotter objects vibrate more.

(5) When we sweat our body temperature goes up.

(6) In melting solid substances convert to gas.

(7) On heating the particles of substances expand.

(8) Convection of heat does not need any medium.

(9) A heating pan has no use of an insulator.

(10) In cold weather birds puff their feathers.

Question No. 2

Fill in the blanks

Question No. 3

Short answer type questions

Question No. 4

Long answer type questions

Question No. 5

Match the column

Answer :

Question No. 6

In case of conductors the direction of heat flow is:

Answer :

Often from cold to hot body

Sometimes from cold to hot body

Always from hot to cold body

Sometimes from hot to cold body

Question No. 7

Bodies in thermal equilibrium have a temperature difference :

Answer :

In Celsius scale it is 4°C

In Fahrenheit scale it is 32 ° F

It is zero in any scale

In Kelvin scale it is 273K

Question No. 8

In vacuum flask heat loss is minimized by cutting down

Answer :

Conduction and radiation

Convection and radiation

Convection and conduction

All the three modes of heat transfer

Question No. 9

Pans of cooking utensils should be made of materials that are

Answer :

Conductors

Insulators

Radiators

Semiconductors

Question No. 10

In case of conductors the direction of heat flow is:

Answer :

Often from cold to hot body

Sometimes from cold to hot body

Always from hot to cold body

Sometimes from hot to cold body

Question No. 11

Bodies in thermal equilibrium have a temperature difference :

Answer :

In Celsius scale it is 4°C

In Fahrenheit scale it is 32 ° F

It is zero in any scale

In Kelvin scale it is 273K

Question No. 12

In vacuum flask heat loss is minimized by cutting down

Answer :

Conduction and radiation

Convection and radiation

Convection and conduction

All the three modes of heat transfer

Question No. 13

The fastest mode of heat transfer is

Answer :

Radiation

Convection

Conduction

Combination of conduction and convection

Question No. 14

Which of the following is not a temperature scale?

Answer :

Kelvin

calorie

Fahrenheit

Celsius

Question No. 15

Thermometers work on the principle of

Answer :

Cooling of substances

Heating of substances

Convection of heat

Expansion of substances

Question No. 16

Land breeze and sea breeze are good examples of :

Answer :

Radiation in nature

Convection in nature

Conduction in nature

Wind transfer in nature

Question No. 17

Which of the following are bad conductors of heat?

Answer :

Silver and copper

Silver and wool

Wood and steel

Water and Air

Question No. 18

The fastest mode of heat transfer is

Answer :

Radiation

Convection

Conduction

Combination of conduction and convection

Question No. 19

Thermal equilibrium is achieved when

Answer :

Heat transfer is from hot to cold

Heat transfer is cold to hot

When heat transfer is just beginning

When there is no heat transfer

Chapter

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