Question # 1

____________ from sun are major source of energy on earth.

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Light

Radiation

Both a & b

None of these

Shining silvered surface is a best:

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Emitter

Absorber

Reflector

None of these

The brids stretch out their wings and circle in the rising currents of hot air called

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conduction

convection

radiation

thermals

Larger is the area greater will be:

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Radiation

Transfer of heat

Evaporation

Conduction of heat

There are ______ modes of transfer of heat:

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1

2

3

4

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)

In large building central heating system worms on the principle of

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conduction

convection

radiation

waves

Convection of heat is a process of heat transfer due to;

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Random motion of molecules

Downward motion of molecules

Upward motion of molecules

Free motion of molecules

The device used to stop conduction, convention and radiation:

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Thermometer

Thermo flask

Both

Nil

The substances through which heat does not conduct:

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Conductors

Bad conductors

Insulators

Both B and C

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

Land and Sea breezes are the results of:

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Conduction

Convection

Radiation

Conduction and Radiation

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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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