Question # 1

More radiation is reflected by the surface:

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White

Coloured

Black

Rough

Radiation are emited by:

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Cold body

Hot body

All bodies

None

In atoms and molecules are packed closely together:

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Solids

Gas

Liquid

Plasma

Feathers of bird give good thermal:

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Conduction

Insulation

Convection

None of these

Dull black surface is a best:

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Emitter

Absorber

Reflector

None of these

Central heating systems in buildings operate by

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Conduction

Radiation

Convection

Condensation

Shining silvered surface is a best:

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Emitter

Absorber

Reflector

None of these

Those objects that conduct electricity are:

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Conductors

Insulators

Semi conductOrs

None of these

In gases, heat is mainly transferred by

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Molecular collision

Conduction

Convection

Radiation

Coloured surface is a

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Best emitter

Good emitter

Bad emitter

Wrost emitter

Light from the sun contain thermal radiation of:

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Long wavelength

Short wavelength

Ultra violet rays

Visible light

The rate at which various surface absorb heat depends upon:

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Nature of surface

Nature of liquid

Radiation

Emission & absorption

Heat radiation obey the laws of:

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Absorption

Reflection

Both A and B

None

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9th Class Physics Chapter 9 Transfer of Heat English Medium KPK Boards Online Mcqs MCQs With Answers

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