Question # 1

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

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

The types of mechanical energy is/are:

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Kinetic energy

Potential energy

Both of these

None of these

The dimensions of work

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[MLT^-1]

[MLT^-2]

[ML²T^-2]

[MLT]

SI Unit of work is

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Nm^-1

Joule

Nms

Both a and b

Which one is conservative force

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Electric force

Frictional force

Normal force

Air resistance

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 force and displacement are in opposite direction, the work done is taken as

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Positive work

Negative work

Zero work

Infinite work

The energy stored int he water of the dam is:

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Electric energy

Kinetic energy

Potential energy

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

Which of the following type of force can do no work on the particle on which it acts:

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Frictional force

Gravitational force

Electric force

Centripetal force

A 2 kg block is held 1 m above floor for 50 seconds. The work done is:

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Zero

10.2 J

100 J

980 J

Work done is independent of path followed in _______

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Gravitational field

Magnetic field

Electric field

All of these

A two Kg block is held 1 m above the floor for 50 seconds, the work done is:

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Zero

10.2 J

100 J

980 J

A labourer carrying a distance a load on his head moves from rest on a horizontal road to another point where he comes to rest. He has done:`

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Minimum work

Maximum work

Zero work

Negative work

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

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