Question # 1

What gas behaves as glass or polythene to radiation:

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Nitrogen

Hydrogen

Carbon di oxide

Methane

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)

A Leslie cube is use to identify :

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Radiation

Conduction

Convection

Both A and B

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

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Long

Medium

Short

All

Which gas behaves as glass or polythene to radiation:

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Nitrogen

Hydrogen

Carbon di oxide

Methane

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

The bad conductor of heat is:

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Iron

Copper

Air

Aluminum

In building central heating system works on the process of:

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Covection

Radiation

Conduction

both a and b

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

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

Which one box is used to keep food hot and ice cream cold for long period?

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Iron box

Aluminium Box

Styrofoam box

Plastic box

The main source of energy in the unierse is:

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Moon

Stars

Sun

Planets

In which hot liquid can remains hot:

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Glass

Lead

Thermos

Hot pot

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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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