Question # 1

____________ from sun are major source of energy on earth.

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Light

Radiation

Both a & b

None of these

Larger is the area greater will be:

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Radiation

Transfer of heat

Evaporation

Conduction of heat

The rate at which various surface absorb heat depends upon:

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Nature of surface

Nature of liquid

Radiation

Emission & absorption

In atoms and molecules are packed closely together:

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Solids

Gas

Liquid

Plasma

Which of the following is a good radiator of heat?

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A shining slivered surface

A dull black surface

A white surface

A green coloured surfaced

Central heating systems in buildings operate by

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Conduction

Radiation

Convection

Condensation

On heating Air becomes.

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Heavier

Lighter

Remain same

None

Leslie's cube is a bod of

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Metal

None Metal

wood

Metalloids

Heat can be transmitted form one object to the other by

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convection

radiation

conduction

all of these

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

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Carbon dioxide

Nitrogen

Oxygen

Methane

Unit of thermal conductivity is .

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Wmk

W m^-1 K^-1

Wm

None of these

Land breeze from land to sea during:

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Day

Night

Afternoon

Morning

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