Question # 1

All ________ conduct heat easily:

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Non metals

Gases

Material

Metals

Radiation are emited by:

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Cold body

Hot body

All bodies

None

On heating Air becomes.

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Heavier

Lighter

Remain same

None

Falls ceiling is done to:

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Lower the height of ceiling

Keep the roof clean

Cool the room

Insulate the ceiling

Shining silvered surface is a best:

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Emitter

Absorber

Reflector

None of these

Land and Sea breezes are the results of:

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Conduction

Convection

Radiation

Conduction and radiation

The substances through which heat does not conduct:

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Conductors

Bad conductors

Insulators

Both B and C

All bodies absorb or emit energy by

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convection

radiation

conduction

both (a) & (c)

The device used to stop conduction, convention and radiation:

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Thermometer

Thermo flask

Both

Nil

Worst absorber of heat is:

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Dull black surface

Coloured surface

Shinning silvered surface

White surface

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

................ causes coastal breeze.

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Conduction

Convection

Radiation

Nil

Light from the sun contain thermal radiation of:

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Long wavelength

Short wavelength

Ultra violet rays

Visible light

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