Question # 1

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)

Radiation are emited by:

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Cold body

Hot body

All bodies

None

The insulator of heat is:

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Cork

Cotton

Wood

All

How does heat reaches form sun to earth through?

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Conduciton

Convection

Radiation

None

Which one is a good conductor?

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cotton

air

wool

iron

Example of bad conductor is:

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Wool

Iron

Graphite

Gold

All are conductors except:

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Copper

Wires

Steel

Wood

Leslie's cube is filled with:

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Cold water

Hot water

Mercury

Air

____________ is bad conductors of heat:

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Copper

Water

Wire

Nil

In houses, good thermal insulation means _____________ consumption of fuel:

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Lower

Higher

Normal

None

Leslie cube have faces:

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2

3

4

5

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

More radiation is reflected by the surface:

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White

Coloured

Black

Rough

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