Question # 1

In which hot liquid can remains hot:

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Glass

Lead

Thermos

Hot pot

Example of bad conductor is:

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Wool

Iron

Graphite

Gold

Larger number of slots are made in radiators to increase:

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Surface temperature

Surface area

Both A and B

Nonr

Land and Sea breezes are the results of:

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Conduction

Convection

Radiation

Conduction and radiation

Which one is a good conductor?

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cotton

air

wool

iron

Conduction on heat occur at ________ rate in materials

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Different

Same

Both A and B

None

Birds are able to fly on ____________

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Radiations

Thermals

Air

Layers

The insulator of heat is:

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Cork

Cotton

Wood

All

Convention is done by ____________

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Vibration of atoms

Actual movement of particles

Same as conduction

Nil

Both metals and non-metals transfer:

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Electricity

Heat

Both A and B

None of these

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

Radiation are emited by:

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Cold body

Hot body

All bodies

None

Those objects that conduct electricity are:

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Conductors

Insulators

Semi conductOrs

None of these

At night , the air from land to begins towards sea called:

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Land breeze

Sea breaze

Both A and B

Radiation

The bad conductor of heat is:

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Iron

Copper

Air

Aluminum

In solid, heat is transferred by:

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Radiation

Conduction

Convection

Absorption

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

Which surface is best reflector of heat?

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dull black surface

coloured surface

white surface

shining slivered surface

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