Question # 1

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

Leslie cube have faces:

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2

3

4

5

The substances through which heat does not conduct:

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Conductors

Bad conductors

Insulators

Both B and C

Anything kept in thermos :

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In temperature remain constant

Its temperature decrease

Its temperature increase

None of these

____________ is bad conductors of heat:

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Copper

Water

Wire

Nil

A Leslie cube is use to identify :

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Radiation

Conduction

Convection

Both A and B

Air and water is conductor:

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Poor

Good

Excellent

None of these

In solid, heat is transferred by:

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Radiation

Conduction

Convection

Absorption

Metals are good conductor of heat due to:

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Free electrons

Reamain same

Small size of their molecules

Rapid vibration of their atoms

Convection of heat is a process of heat transfer due to;

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Random motion of molecules

Downward motion of molecules

Upward motion of molecules

Free motion of molecules

False ceiling is done to

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Lower the height of ceiling

Keep the roof clean

Cool the room

Insulate the ceiling

Larger is the area greater will be:

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Radiation

Transfer of heat

Evaporation

Conduction of heat

The main source of energy n the universe is:

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Moon

Stars

Sun

Planets

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9th Class Physics Chapter 9 Transfer of Heat English Medium KPK Boards Online Mcqs MCQs With Answers

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