Question # 1

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

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conduction

convection

radiation

thermals

In which hot liquid can remains hot:

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Glass

Lead

Thermos

Hot pot

Unit of thermal conductivity is .

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Wmk

W m^-1 K^-1

Wm

None of these

The mathematical formula of thermal conductivity is

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k =Q/t x L/A (T1 - T2)

k =Q/t x L/A (T1 + T2)

k =t/Q x L/A (T1 - T2)

k =2Q/t x L/A (T1 + T2)

In solids, Heat is transferred by:

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Radiation

Conduction

Convection

Absorption

All bodies absorb or emit energy by

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convection

radiation

conduction

both (a) & (c)

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

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1

2

3

4

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

Those objects that conduct electricity are:

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Conductors

Insulators

Semi conductOrs

None of these

In large building central heating system worms on the principle of

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conduction

convection

radiation

waves

A Leslie cube is a:

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Metal box

Wooden box

Glass box

None

Radiation are emited by:

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Cold body

Hot body

All bodies

None

Both metals and non-metals transfer:

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Electricity

Heat

Both A and B

None of these

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

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