Question # 1

Light from the sun contain thermal radiation of:

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Long wavelength

Short wavelength

Ultra violet rays

Visible light

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

Thermoflask is used maintain:

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Heat

Temperature

Density

Pressure

More radiation is reflected by the surface:

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White

Coloured

Black

Rough

Leslie cube have faces:

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2

3

4

5

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)

Heat is an important form of

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Matter

Energy

Wind

Force

The SI unit of thermal conductivity is

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Wm K-1

Wm-1K

Wm-1K -1

WmK

Those objects which do not conduct electricity are called.

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Insulator

Semi conductor

Nil

Conduct

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

In which hot liquid can remains hot:

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Glass

Lead

Thermos

Hot pot

Which one is a good conductor?

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cotton

air

wool

iron

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

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