Question # 1

Air and water is conductor:

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Poor

Good

Excellent

None of these

Which surface is bad emitter:

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White surface

Black surface

Coloured surface

Silver surface

The bad conductor of Heat is:

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Iron

Copper

Air

Aluminium

Land and sea breezes are the result of:

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Absorption

Radiation

Conduction

Convection

Transfer of heat by the actual movement of molecules from one place to the other is called

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conduction

convection

radiation

waves

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

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Downward

Upward

Left

right

Those objects that conduct electricity are:

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Conductors

Insulators

Semi conductOrs

None of these

Dull black surface are good ____________

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Absorber

Radiator

Conductor

None of these

Thermal conductivity of iron is Wm^-1 K^-1

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85

36

89

86

Both metals and non-metals transfer:

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Electricity

Heat

Both A and B

None of these

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

Heat form one of a metal rod a reaches to the other by the process of

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convection

radiation

conduction

both (a) and (b)

In building central heating system works on the process of:

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Covection

Radiation

Conduction

both a and b

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