Question # 1

In which hot liquid can remains hot:

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Glass

Lead

Thermos

Hot pot

Worst absorber of heat is:

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Dull black surface

Coloured surface

Shinning silvered surface

White surface

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)

Unit of thermal conductivity is .

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Wmk

W m^-1 K^-1

Wm

None of these

Which surface is best reflector of heat?

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dull black surface

coloured surface

white surface

shining slivered surface

Leslie cube have faces:

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2

3

4

5

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 rate at which various surface absorb heat depends upon:

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Nature of surface

Nature of liquid

Radiation

Emission & absorption

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

The bad conductor of Heat is:

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Iron

Copper

Air

Aluminium

The process in which heat is transfer due to actual movement of molecule is called.

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Conduction

radiation

Convection

All of these

Feathers of bird give good thermal:

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Conduction

Insulation

Convection

None of these

____________ is bad conductors of heat:

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Copper

Water

Wire

Nil

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