Question # 1

__________ is a major source of heat:

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Mercury

Sun

Fire

Moon

In atoms and molecules are packed closely together:

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Solids

Gas

Liquid

Plasma

More radiation is reflected by the surface:

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White

Coloured

Black

Rough

On heating Air become:

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Heavier

Lighter

Remain same

None of these

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

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Conductor

Thermal conductor

Insulator

Both a & b

Air and water is conductor:

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Poor

Good

Excellent

None of these

................ causes coastal breeze.

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Conduction

Convection

Radiation

Nil

The transfer of heat by vibrating molecules in solids :

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Conduciton

Radiation

Convection

None

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

Feathers of bird give good thermal:

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Conduction

Insulation

Convection

None of these

A Leslie cube has faces:

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1

2

3

4

Thermoflask is used maintain:

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Heat

Temperature

Density

Pressure

Leslie's cube is filled with:

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Cold water

Hot water

Mercury

Air

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Physics 9th Class English Medium Unit 9 Online Test MCQs With Answers

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