Question # 1

Central heating systems in buildings operate by

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Conduction

Radiation

Convection

Condensation

During recent years the percentage of __________ increased considerably on earth:

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Carbon dioxide

Nitrogen

Oxygen

Methane

False ceiling is done to

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Lower the height of ceiling

Keep the roof clean

Cool the room

Insulate the ceiling

Example of bad conductor is:

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Wool

Iron

Graphite

Gold

Dull black surface is a best:

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Emitter

Absorber

Reflector

None of these

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

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

Light from the sun contain thermal radiation of:

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Long wavelength

Short wavelength

Ultra violet rays

Visible light

All ________ conduct heat easily:

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Non metals

Gases

Material

Metals

All bodies absorb or emit energy by

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convection

radiation

conduction

both (a) & (c)

The bad conductor of heat is:

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Iron

Copper

Air

Aluminum

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 & b

Which one is a good conductor?

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cotton

air

wool

iron

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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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