Question # 1

The rate of doing work is called :

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Power

Work

Efficiency

None of above

Work is zero when "F" and "S" will be:

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Parallel

Perpendicular

Anti parallel

Tangent

Fossil fuels are usually:

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Carbon di oxide

Hydrogen

Hydrocarbons

Carbon monoxide

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

What type of conversion is done candle burning?

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Chemical __ ;light

Chemical __ heat

Both a & b

None of above

The product of force and displacement is called;

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Work

Efficiency

Power

Energy

If the force of 25 N pulls a stone through a distance of 5 cm in its direction the magnitude of work will be:

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5 J

125 J

175 J

200 J

The energy of a body during the motion is called:

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Potential energy

Kinetic energy

Elastic P.E.

Heat energy

The energy stored in coal is

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Heat energy

Kinetic energy

Chemical energy

Nuclear energy

If the direction of motion of the force is perpendicular to the direction of motion of the body, then work done will be

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Maximum

Minimum

Zero

None of these

What will be the magnitude of work if a force of 25N pulls a stone through a distance of 5 m in its directions

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25 J

50 J

75 J

125 J

A body OF mass 10 kg taken to height of 5m:

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P.E = 500 J

P.E = 50 J

P.E = 5 J

P.E = 5000 J

The S.I unit of power is :

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j/s2

J

W

J/M2

Kinetic energy is possessed by a body by:

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Virtue of motion

Height

Rest

Nil

Formula of Gravitational potential energy is:

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mgh

mg/h

1/2 mv²

None of these

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