Question # 1

Central heating systems in buildings operate by

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Conduction

Radiation

Convection

Condensation

Feathers of bird give good thermal:

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Conduction

Insulation

Convection

None of these

Water is _________ conductor:

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Best

Bad

Good

Poor

Larger is the area greater will be:

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Radiation

Transfer of heat

Evaporation

Conduction of heat

All are conductors except:

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Copper

Wires

Steel

Wood

The SI unit of thermal conductivity is

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Wm K-1

Wm-1K

Wm-1K -1

WmK

Leslie's cube is filled with

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Cold water

Hot water

Mercury

Air

Radiation are emited by:

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Cold body

Hot body

All bodies

None

A Leslie cube is use to identify :

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Radiation

Conduction

Convection

Both A and B

See breeze blows form sear to land during:

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day

night

after noon

morning

If heat Q flows in time 't' through some metal then rate of flow of heat is defined as

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Flow of heat = 2Qt

Flow of heat = Q/t

Flow of heat = t/Q

Flow of heat = Qt

Dull black surface is a best:

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Emitter

Absorber

Reflector

None of these

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