Question # 1

Which process produced cooling effect?

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boiling

freezing

condensation

evaporation

Stress is defined as

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Stress = Force/ Area

Stress = Area/Force

Stress = Area/ Volume

Stress = Mass/ Volume

On heating Air becomes.

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Heavier

Lighter

Remain same

None

Plasma exist in _______________

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Earth

Satellite

Moon

Sun

The product of force and displacement is called;

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Work

Efficiency

Power

Energy

In measurement 1.032 numbers of significant figure are.

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1

2

3

4

The S.I unit of efficiency is :

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J/s

Nm

watt

It has no unit

The temperature if steam is

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0°C

100°C

273°C

-273°C

Magnetic force is an example of :

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Action at a distance

Force

Torque

Nil

The temperature of sun surface is:

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5000°C

4000°C

6000°C

7000°C

Plasma is in ___________ form.

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Moleculer

Kinetic

Static

Ionized

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)

How does heat reaches form sun to earth through?

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Conduciton

Convection

Radiation

None

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