Question # 1

False celling is done to

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Lower the height of ceiling

Keep the roof clean

cool and room

Insulate the ceiling.

Those objects which do not conduct electricity are called.

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Insulator

Semi conductor

Nil

Conduct

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

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Downward

Upward

Left

right

Convention is done by ____________

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Vibration of atoms

Actual movement of particles

Same as conduction

Nil

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

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85

36

89

86

More radiation is reflected by the surface:

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White

Coloured

Black

Rough

The temperature of a black dull surface on heating :

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Rise Rapidly

Fall Rapidly

Becomes zero

Remain constant

Land and Sea breezes are the results of:

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Conduction

Convection

Radiation

Conduction and radiation

Leslie's cube is filled with:

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Cold water

Hot water

Mercury

Air

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

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Conductor

Thermal conductor

Insulator

both a & b

Glass and transparent polythene sheets allow radiations of wavelength to pass through them:

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Long

Short

Medium

All

The sun's surface temperature is :

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3,000 K

3,030 k

6,000 K

600 K

All bodies absorb or emit energy by

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convection

radiation

conduction

both (a) & (c)

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Physics 9th Class English Medium Unit 9 Online Test MCQs With Answers

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