Question # 1

Larger number of slots are made in radiators to increase:

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Surface temperature

Surface area

Both A and B

Nonr

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

Leslie's cube is filled with:

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Cold water

Hot water

Mercury

Air

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

All are conductors except:

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Copper

Wires

Steel

Wood

See breeze blows form sear to land during:

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day

night

after noon

morning

Leslie's cube is a box of:

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Metal

Non-Metal

Wood

Metalloids

The substances through which heat does not conduct:

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Conductors

Bad conductors

Insulators

Both B and C

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

Those objects that conduct electricity are:

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Conductors

Insulators

Semi conductOrs

None of these

Unit of thermal conductivity is .

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Wmk

W m^-1 K^-1

Wm

None of these

The bad conductor of Heat is:

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Iron

Copper

Air

Aluminium

The radiation from sun is:

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Alpha

Gamma

Radio

Ultraviolet

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

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