Question # 1

If the velocity of a body becomes double, then its kinetic energy will:

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Remain the same

Become double

Become four time

Become half

If a body does work at the rate of 1 Js^-1then its power will be:

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KW

1 MW

1 W

None of these

Work done is maximum when angle between force and displacement is:

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45°

0°

60°

90°

The ratio of useful output to input energy is called:

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Power

Energy

Efficiency

Horse power

A body possesses if it is capable to do work:

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Energy

Power

Force

All

According to law of conservation of energy increases in P.E is equal to:

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Increase K.E

Decrease in K.E

Decrease in P.E

None

What type of conversion is done candle burning?

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Chemical __ ;light

Chemical __ heat

Both a & b

None of above

In falling object potential energy is covered to:

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K.E

Force

P.E

Nil

The energy of a body during the motion is called:

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Potential energy

Kinetic energy

Elastic P.E.

Heat energy

If mass of body is 10 kg travelling with speed of light, how much energy is generated?

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E = 9 × 1017 J

E = 9 × 1015 J

E = 9 × 1018 J

E = 9 × 1016 J

The S.I unit of power is :

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j/s2

J

W

J/M2

If f = 40 N is applied and bus is move 1m than work is :

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40 J

60 J

80 J

No work

The ability of a body to do work is known as

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power

energy

kinetic energy

potential energy

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