Question # 1

Air and water is conductor:

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Poor

Good

Excellent

None of these

A Leslie cube has faces:

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1

2

3

4

Amount of heat that flows in unit time is called:

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Rate of flow of heat

Q/t

Conductivity

Both A and B

Example of bad conductor is:

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Wool

Iron

Graphite

Gold

The earth temperature is :

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300 K

200 k

100 K

50 K

On heating Air becomes.

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Heavier

Lighter

Remain same

None

................ causes coastal breeze.

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Conduction

Convection

Radiation

Nil

The main source of energy n the universe is:

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Moon

Stars

Sun

Planets

All are conductors except:

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Copper

Wires

Steel

Wood

Metals are good conductor of heat due to

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Free Electrons

Big size of their molecules

Small size of their molecules

Rapid vibrations of their atoms

Light from the sun contain thermal radiation of:

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Long wavelength

Short wavelength

Ultra violet rays

Visible light

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

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Carbon dioxide

Nitrogen

Oxygen

Methane

Rooms are heated using gas heater by:

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Conduction only

Convection and radiation

Radiation only

Convection only

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