Question # 1

Rooms are heated using gas heaters by

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Conduction only

Convection and radiation

Radiation only

Convection only

Larger number of slots are made in radiators to increase:

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Surface temperature

Surface area

Both A and B

Nonr

____________ is bad conductors of heat:

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Copper

Water

Wire

Nil

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

In which hot liquid can remains hot:

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Glass

Lead

Thermos

Hot pot

See breeze blows form sear to land during:

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day

night

after noon

morning

Feathers of bird give good thermal:

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Conduction

Insulation

Convection

None of these

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

Which of the following is an insulator?

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Wood

Glass

Plastic

Steel

____________ from sun are major source of energy on earth.

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Light

Radiation

Both a & b

None of these

Dull black surface is a best:

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Emitter

Absorber

Reflector

None of these

Conduction on heat occur at ________ rate in materials

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Different

Same

Both A and B

None

False ceiling is done to

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Lower the height of ceiling

Keep the roof clean

Cool the room

Insulate the ceiling

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