Question # 1

Which force is not a conservative force?

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Frictional force

Gravitational force

Electric force

Elastic spring force

The total work done in moving the body up and then down through the same height in a gravitational field is equal to:

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mgh

Its wight

Weight X height

Zero

Work is always done on a body when:

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A force acts on it

It moves through certain distance

None of A or B is correct

Both A and B is correct

Work is a Quantity

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Vector

Scalar

Non-physical

None of these

If one newton force acts on a body and displaces the body through 1m work done on body is

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1 dyne

1 joule

1KJ

1 Watt

When a force of 0.5 N displaces a body through a distance of 2m in the direction of force, the work done is

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0.5 J

2 J

0.25 J

1 J

If work is done at the rate of 2 k j per second, then total work done is half an hour will be:

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0.5 Kwn

2 Kwh

1 Kwh

None of these

Area under the force displacement graph gives

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Power

Work

Heat

Energy

Work has a dimension as that of:

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Torque

Angular momentum

Linear momentum

Power

Energy stored in the spring of a watch is called

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Potential energy

Kinetic energy

Nuclear energy

Elastic potential

A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done is 25J. The angle which the force makes the direction of motion will be:

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60°

90°

30°

0°

Work is product of:

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Force and velocity

Heat and energy

Force and displacement

None of these

The tidal energy is produced due to rotation of Earth relative to:

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Moon

Sun

Oceans

Water

Work done on a body by gravity in lifting it up to certain height is

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Maximum

Minimum

Zero

Negative

The Space around the Earth within which it exerts a force of attraction on other bodies is known as

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Nuclear field

Conservative field

Electric field

Gravitational field

Most of the geysers occur in:

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Volcanic regions

Magnetic regions

Northern region

None of these

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Physics ECAT Pre Engineering Chapter 4 Work and Energy Online Test MCQs With Answers

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