Question # 1

Metals are good conductor of heat due to:

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Free electrons

Reamain same

Small size of their molecules

Rapid vibration of their atoms

Transfer of heat by the actual movement of molecules from one place to the other is called

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conduction

convection

radiation

waves

More radiation is reflected by the surface.

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White

Coloured

Black

Rough

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

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Downward

Upward

Left

right

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

In thermo flask radiation is stopped by using :

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Green color

Transparent

Silver color

Nil

Heat form one of a metal rod a reaches to the other by the process of

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convection

radiation

conduction

both (a) and (b)

Unit of thermal conductivity is .

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Wmk

W m^-1 K^-1

Wm

None of these

Transfer of heat by actual movement of molecules form hot place to cold place is called:

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Conduction

Convection

Radiation

None

The conduction is due to:

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They have high boiling point

Vibration of atoms

They have high melting point

None of above

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

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Conductor

Thermal conductor

Insulator

Both a & b

The sun's surface temperature is :

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3,000 K

3,030 k

6,000 K

600 K

____________ from sun are major source of energy on earth.

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Light

Radiation

Both a & b

None of these

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9th Class Physics Chapter 9 Transfer of Heat English Medium KPK Boards Online Mcqs MCQs With Answers

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