Question # 1

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

Conduction on heat occur at ________ rate in materials

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Different

Same

Both A and B

None

What gas behaves as glass or polythene to radiation:

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Nitrogen

Hydrogen

Carbon di oxide

Methane

In large building central heating system worms on the principle of

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conduction

convection

radiation

waves

Good conductor is :

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Air

Wood

Iron

None

Those objects that conduct electricity are:

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Conductors

Insulators

Semi conductOrs

None of these

If heat Q flows in time 't' through some metal then rate of flow of heat is defined as

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Flow of heat = 2Qt

Flow of heat = Q/t

Flow of heat = t/Q

Flow of heat = Qt

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

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Conductor

Thermal conductor

Insulator

both a & b

Central heating systems in buildings operate by

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Conduction

Radiation

Convection

Condensation

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

Poor conductor of heat is:

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Copper

Aluminium

Water

Iron

Thermos flask, is used to maintain:

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Heat

Temperature

Density

Pressure

Glider pilots use __________ movement of hot air currents due to convection of heat:

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Downward

Upward

Left

right

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