Question # 1

Thermoflask is used maintain:

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Heat

Temperature

Density

Pressure

Metals are good conductors of heat due to :

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Free electrons

Big size of molecules

Small size of molecules

None of these

Leslie cube have faces:

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2

3

4

5

Good conductor is :

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Air

Wood

Iron

None

Rooms are heated using gas heaters by

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Conduction only

Convection and radiation

Radiation only

Convection only

Which gas behaves as glass or polythene to radiation:

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Nitrogen

Hydrogen

Carbon di oxide

Methane

Wood, cork, cotton, wool, rubber are the eamples of:

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Conductor

Thermal conductor

Insulator

both a & b

A black dull surface is a good ________ of heat:

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Emitter

Absorber

Reflector

Both A and B

Unit of thermal conductivity is .

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Wmk

W m^-1 K^-1

Wm

None of these

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

In which hot liquid can remains hot:

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Glass

Lead

Thermos

Hot pot

Land and sea breezes are the result of:

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Absorption

Radiation

Conduction

Convection

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