Question # 1

____________ from sun are major source of energy on earth.

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Light

Radiation

Both a & b

None of these

On heating Air become:

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Heavier

Lighter

Remain same

None of these

The earth also completes its one revolution about its axis in.

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1 Hours

6 Hours

13 Hours

24 Hours

Where there is no air the atmospheric pressure is:

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Zero

101300 Pa

7 nm Hg

1000 Nm^-2

The eleventh general conference was held in Paris in.

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1959

1961

1660

1960

Rate of change of momentum equals:

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Displacement

Acceleration

^Force

Velocity

If a liquid of mass 'm' requires thermal energy 'ΔQv' to completely change into gas at its boiling point without any change in its temperature, then its latent heat of vapourization can be calculated as following:

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Hv = m/ΔQv

Hv = mΔQv

Hv = cmΔQv

Hv =ΔQv/m

Stress is defined as

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Stress = Force/ Area

Stress = Area/Force

Stress = Area/ Volume

Stress = Mass/ Volume

The work done will be zero when the angle between the force and the distance is:

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45^o

90^o

60^o

180^o

All divers need to wear seat belt because of effect of:

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Air resistance

Tensional

Push force

Gravitational

Tensile strain produces the change in the object.

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Length

Volume

Area

Density

The force acting on unit area at surface of a body is called:

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Strain

Elasticity

Force

Stress

If the distance is doubled between two masses. The gravitational force will decrease:

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4 times

2 times

One forth

One third

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