Question # 1

Anything kept in thermos :

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In temperature remain constant

Its temperature decrease

Its temperature increase

None of these

Example of bad conductor is:

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Wool

Iron

Graphite

Gold

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

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Downward

Upward

Left

right

Light from the sun contain thermal radiation of:

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Long wavelength

Short wavelength

Ultra violet rays

Visible light

Feathers of bird give good thermal:

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Conduction

Insulation

Convection

None of these

Rooms are heated using gas heater by:

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Conduction only

Convection and radiation

Radiation only

Convection only

Land breeze from land to sea during:

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Day

Night

Afternoon

Morning

Feathers of bird give good thermal:

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Conduction

Insulation

Convection

None of these

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

There are ______ modes of transfer of heat:

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1

2

3

4

The process in which heat is transmitted form one body to another by the interaction of atoms and the movement of free electrons is known as

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convection

radiation

conduction

both (a) and (b)

In atoms and molecules are packed closely together:

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Solids

Gas

Liquid

Plasma

The main source of energy in the unierse is:

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Moon

Stars

Sun

Planets

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

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