Question # 1

What gas behaves as glass or polythene to radiation:

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Nitrogen

Hydrogen

Carbon di oxide

Methane

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

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Long

Short

Medium

All

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

All are conductors except:

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Copper

Wires

Steel

Wood

There are ways to transfer the heat from one place to another.

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1

2

3

4

Unit of thermal conductivity is .

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Wmk

W m^-1 K^-1

Wm

None of these

The main source of energy n the universe is:

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Moon

Stars

Sun

Planets

There are ______ modes of transfer of heat:

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1

2

3

4

Room are heated using gas heaters by:

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Conduction only

Convection and radiation

Radiation only

Convection only

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

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conduction

convection

radiation

thermals

Which gas behaves as glass or polythene to radiation:

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Nitrogen

Hydrogen

Carbon di oxide

Methane

The quantity of heat absorbed by the body depends upon:

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Colour of surface

Nature of surface

Shape of surface

Both a and b

The process in which heat is transfer due to actual movement of molecule is called.

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Conduction

radiation

Convection

All of these

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Physics 9th Class English Medium Unit 9 Online Test MCQs With Answers

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