Question # 1

Metals are good conductors of heat due to :

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Free electrons

Big size of molecules

Small size of molecules

None of these

In solid, heat is transferred by:

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Radiation

Conduction

Convection

Absorption

In gases, heat in mainly transferred by:

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Molecular collision

Conduction

Convection

Radiaiton

Rooms are heated using gas heaters by

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Conduction only

Convection and radiation

Radiation only

Convection only

The SI unit of thermal conductivity is

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Wm K-1

Wm-1K

Wm-1K -1

WmK

During recent years the percentage of __________ increased considerably on earth:

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Carbon dioxide

Nitrogen

Oxygen

Methane

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

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Conductor

Thermal conductor

Insulator

Both a & b

There are ______ modes of transfer of heat:

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1

2

3

4

Glass and transparent polythene sheets allow radiations of wavelength to pass through them:

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Long

Medium

Short

All

Glass and transparent polythene sheets allow radiations of wavelength to pass through them:

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Long

Short

Medium

All

Which is expert thermal climber:

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Crow

Sparrow

Hawks

None

Transfer of heat by actual movement of molecules form hot place to cold place is called:

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Conduction

Convection

Radiation

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

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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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