Question # 1

The device used to stop conduction, convention and radiation:

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Thermometer

Thermo flask

Both

Nil

False celling is done to

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Lower the height of ceiling

Keep the roof clean

cool and room

Insulate the ceiling.

Conduction on heat occur at ________ rate in materials

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Different

Same

Both A and B

None

The transfer of heat by vibrating molecules in solids :

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Conduciton

Radiation

Convection

None

Dull black surface are good ____________

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Absorber

Radiator

Conductor

None of these

The mathematical formula of thermal conductivity is

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k =Q/t x L/A (T1 - T2)

k =Q/t x L/A (T1 + T2)

k =t/Q x L/A (T1 - T2)

k =2Q/t x L/A (T1 + T2)

In gases, heat in mainly transferred by:

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Molecular collision

Conduction

Convection

Radiaiton

Which is expert thermal climber:

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Crow

Sparrow

Hawks

None

____________ from sun are major source of energy on earth.

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Light

Radiation

Both a & b

None of these

Example of bad conductor is:

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Wool

Iron

Graphite

Gold

Thermoflask is used maintain:

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Heat

Temperature

Density

Pressure

Heat is an important form of

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Matter

Energy

Wind

Force

Thermal conductivity of iron is Wm^-1 K^-1

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85

36

89

86

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