Question # 1

Amount of heat that flows in unit time is called:

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Rate of flow of heat

Q/t

Conductivity

Both A and B

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

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Downward

Upward

Left

right

Dull black surface is a best:

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Emitter

Absorber

Reflector

None of these

The rate at which various surface absorb heat depends upon:

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Nature of surface

Nature of liquid

Radiation

Emission & absorption

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 solids, Heat is transferred by:

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Radiation

Conduction

Convection

Absorption

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

Convection of heat is the process of heat transfer due to the

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Random motion of molecules

Downward movement of molecules

Upward movement of molecules

Free movement of molecules

Metals are good conductor of heat dut to the:

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Free electron

Big size of their molecule

Small size of their molecules

Rapid vibrations of their atoms

____________ from sun are major source of energy on earth.

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Light

Radiation

Both a & b

None of these

Those objects which do not conduct electricity are called.

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Insulator

Semi conductor

Nil

Conduct

____________ is bad conductors of heat:

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Copper

Water

Wire

Nil

In which hot liquid can remains hot:

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Glass

Lead

Thermos

Hot pot

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