Question # 1

Dull black surface is a best:

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Emitter

Absorber

Reflector

None of these

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

The bad conductor of heat is:

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Iron

Copper

Air

Aluminum

The conduction is due to:

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They have high boiling point

Vibration of atoms

They have high melting point

None of above

The bad conductor of Heat is:

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Iron

Copper

Air

Aluminium

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

In gases, heat is mainly transferred by

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Molecular collision

Conduction

Convection

Radiation

Good conductor is :

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Air

Wood

Iron

None

In building central heating system works on the process of:

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Covection

Radiation

Conduction

both a and b

Metals are good conductor of heat due to:

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Free electrons

Reamain same

Small size of their molecules

Rapid vibration of their atoms

Wood, cork, cotton, wool, rubber are the eamples of:

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Conductor

Thermal conductor

Insulator

both a & b

Leslie's cube is filled with:

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Cold water

Hot water

Mercury

Air

In atoms and molecules are packed closely together:

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Solids

Gas

Liquid

Plasma

The brids stretch out their wings and circle in the rising currents of hot air called

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conduction

convection

radiation

thermals

The mathematical formula of thermal conductivity is

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k =Q/t x L/A (T1 - T2)

k =Q/t x L/A (T1 + T2)

k =t/Q x L/A (T1 - T2)

k =2Q/t x L/A (T1 + T2)

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

Leslie's cube is filled with

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Cold water

Hot water

Mercury

Air

There are ______ modes of transfer of heat:

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1

2

3

4

____________ is bad conductors of heat:

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Copper

Water

Wire

Nil

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