Question # 1

Heat form one of a metal rod a reaches to the other by the process of

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convection

radiation

conduction

both (a) and (b)

Which one is a good conductor?

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cotton

air

wool

iron

In thermo flask radiation is stopped by using :

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Green color

Transparent

Silver color

Nil

Birds are able to fly on ____________

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Radiations

Thermals

Air

Layers

Dull black surface are good ____________

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Absorber

Radiator

Conductor

None of these

Feathers of bird give good thermal:

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Conduction

Insulation

Convection

None of these

A black dull surface is a good ________ of heat:

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Emitter

Absorber

Reflector

Both A and B

The radiation from sun is:

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Alpha

Gamma

Radio

Ultraviolet

The bad conductor of heat is:

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Iron

Copper

Air

Aluminum

Glider pilots use __________ movement of hot air currents due to convection of heat:

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Downward

Upward

Left

right

If heat Q flows in time 't' through some metal then rate of flow of heat is defined as

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Flow of heat = 2Qt

Flow of heat = Q/t

Flow of heat = t/Q

Flow of heat = Qt

A Leslie cube has faces:

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1

2

3

4

How does heat reaches form sun to earth through?

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Conduciton

Convection

Radiation

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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