Question # 1

Larger number of slots are made in radiators to increase:

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Surface temperature

Surface area

Both A and B

Nonr

Which of the following is a good radiator of heat?

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A shining slivered surface

A dull black surface

A white surface

A green coloured surfaced

The radiation from sun is:

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Alpha

Gamma

Radio

Ultraviolet

How does heat reaches form sun to earth through?

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Conduciton

Convection

Radiation

None

Leslie's cube is a box of:

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Metal

Non-Metal

Wood

Metalloids

Heat is an important form of

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Matter

Energy

Wind

Force

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 and b

Leslie's cube is filled with

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Cold water

Hot water

Mercury

Air

Convection of heat is a process of heat transfer due to;

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Random motion of molecules

Downward motion of molecules

Upward motion of molecules

Free motion of molecules

Shining silvered surface is a best:

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Emitter

Absorber

Reflector

None of these

In building central heating system works on the process of:

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Covection

Radiation

Conduction

both a and b

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

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