Question # 1

Tan 90°=

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Infinity

1

0

0.866

Einstein's mass-energy equation is

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E = mc

E = mc2

E = 2mc

E = m2c

Which of the following affects evaporation?

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Temperature

Surface area of the liquid

Wind

All of the above

A mass of a body:

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Decreases when accelerated

Increases when accelerated

Decreases when moving with velocity

None of the above

Convection of heat is the process of heat transfer due to the

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Random motion of molecules

Downward movement of molecules

Upward movement of molecules

Free movement of molecules

Water freezes at:

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0° F

32°F

-273 K

0 K

The quantity of heat absorbed by the body depends upon:

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Colour of surface

Nature of surface

Shape of surface

Both a and b

in isolated system the momentum after collision of two bodies.

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Increase

Constnat

Decrease

Zero

The product of force and displacement is called;

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Work

Efficiency

Power

Energy

Stress is defined as

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Stress = Force/ Area

Stress = Area/Force

Stress = Area/ Volume

Stress = Mass/ Volume

Unit of thermal conductivity is .

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Wmk

W m^-1 K^-1

Wm

None of these

If the force of 25 N is acting along the string to balance the weight then tension in string is

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25 N

50 N

Zero

None

In gases, heat is mainly transferred by

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Molecular collision

Conduction

Convection

Radiation

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