Question # 1

Dull black surface are good ____________

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Absorber

Radiator

Conductor

None of these

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

What happens to the thermal conductivity of a wall if its thickness is doubled?

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Become double

Remain the same

Become half

Become one fourth

Central heating systems in buildings operate by

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Conduction

Radiation

Convection

Condensation

Anything kept in thermos :

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In temperature remain constant

Its temperature decrease

Its temperature increase

None of these

In solids, Heat is transferred by:

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Radiation

Conduction

Convection

Absorption

Which one is a good conductor?

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cotton

air

wool

iron

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

Water is _________ conductor:

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Best

Bad

Good

Poor

Glider pilots use __________ movement of hot air currents due to convection of heat:

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Downward

Upward

Left

right

On hot days cold air from sea began to move towards land:

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Sea breeze

Land breeze

Both A and B

None of these

Degree of hotness or coldness of the body is called:

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Heat capacity

Thermal conductivity

Heat

Temperture

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

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