Question # 1

Dull black surface is a best:

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Emitter

Absorber

Reflector

None of these

The bad conductor of Heat is:

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Iron

Copper

Air

Aluminium

The rate at which various surface absorb heat depends upon:

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Nature of surface

Nature of liquid

Radiation

Emission & absorption

The quantity of heat absorbed by the body depends upon:

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Colour of surface

Nature of surface

Shape of surface

Both a & b

Land breeze from land to sea during:

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Day

Night

Afternoon

Morning

In solid, heat is transferred by:

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Radiation

Conduction

Convection

Absorption

Those objects that conduct electricity are:

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Conductors

Insulators

Semi conductOrs

None of these

The temperature of a black dull surface on heating :

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Rise Rapidly

Fall Rapidly

Becomes zero

Remain constant

On heating Air becomes.

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Heavier

Lighter

Remain same

None

In large building central heating system worms on the principle of

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conduction

convection

radiation

waves

Worst absorber of heat is:

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Dull black surface

Coloured surface

Shinning silvered surface

White surface

Larger number of slots are made in radiators to increase:

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Surface temperature

Surface area

Both A and B

Nonr

Which one is a good conductor?

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cotton

air

wool

iron

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