Question # 1

Transfer of heat by actual movement of molecules form hot place to cold place is called:

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Conduction

Convection

Radiation

None

Metals are good conductor of heat due to

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Free Electrons

Big size of their molecules

Small size of their molecules

Rapid vibrations of their atoms

Unit of thermal conductivity is .

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Wmk

W m^-1 K^-1

Wm

None of these

Amount of heat that flows in unit time is called:

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Rate of flow of heat

Q/t

Conductivity

Both A and B

The SI unit of thermal conductivity is

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Wm K-1

Wm-1K

Wm-1K -1

WmK

Convection of heat is the process of heat transfer due to the:

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Random motion of molecules

Downward movement of molecules

Upward movement of molecules

Free movement of molecules

Glass and transparent polythene sheets allow radiations of wavelength to pass through them:

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Long

Medium

Short

All

Shining silvered surface is a best:

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Emitter

Absorber

Reflector

None of these

Coloured surface is a

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Best emitter

Good emitter

Bad emitter

Wrost emitter

False celling is done to

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Lower the height of ceiling

Keep the roof clean

cool and room

Insulate the ceiling.

Land breeze from land to sea during:

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Day

Night

Afternoon

Morning

In gases, heat in mainly transferred by:

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Molecular collision

Conduction

Convection

Radiaiton

There are ways to transfer the heat from one place to another.

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1

2

3

4

Which of the following is a good radiator of heat?

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A shining slivered surface

A dull black surface

A white surface

A green coloured surfaced

Glider pilots use __________ movement of hot air currents due to convection of heat:

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Downward

Upward

Left

right

What happens to the thermal conductivity of a wall if its thickness is doubled?

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Become double

Remain the same

Become half

Become one fourth

Which one is a good conductor?

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cotton

air

wool

iron

What of the following is a god radiator of heat?

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a Shinning silvered surface

a dull black surface

a white black surface

a shinning colored surface

The process in which heat is transmitted form one body to another by the interaction of atoms and the movement of free electrons is known as

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convection

radiation

conduction

both (a) and (b)

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