Question # 1

What of the following is a god radiator of heat?

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a Shinning silvered surface

a dull black surface

a white black surface

a shinning colored surface

Thermal conductivities of Lead

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23

30

35

85

Heat is an important form of

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Matter

Energy

Wind

Force

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

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conduction

convection

radiation

thermals

Rooms are heated using gas heater by:

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Conduction only

Convection and radiation

Radiation only

Convection only

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

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1

2

3

4

Land and Sea breezes are the results of:

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Conduction

Convection

Radiation

Conduction and Radiation

The device used to stop conduction, convention and radiation:

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Thermometer

Thermo flask

Both

Nil

Conduction on heat occur at ________ rate in materials

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Different

Same

Both A and B

None

The main source of energy n the universe is:

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Moon

Stars

Sun

Planets

Convection of heat is the process of heat transfer due to the:

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Random motion of molecules

Downward movement of molecules

Upward movement of molecules

Free movement of molecules

In large building central heating system worms on the principle of

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conduction

convection

radiation

waves

The main source of energy in the unierse is:

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Moon

Stars

Sun

Planets

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

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