Question # 1

The dimensions of work

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[MLT^-1]

[MLT^-2]

[ML²T^-2]

[MLT]

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

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0°

30°

60°

90°

When force and displacement are perpendicular to each other than work is equal to

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Unity

Infinity

Zero

-Fd

Work is a

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Scalar quantity

Vector quantity

Base quantity

None of these

The work done by a force keeping an object in circular motion with constant speed is:

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Zero J.

0.1 J

1 J

0.01 J

Work done is independent of path followed in _______

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Gravitational field

Magnetic field

Electric field

All of these

Work done in lower and bucket into the well is:

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Zero

Positive

Negative

None of these

Work is a Quantity

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Vector

Scalar

Non-physical

None of these

Power is a :

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Vector quantity

Base quantity

Scalar quantity

None of these

Work has the dimensions as that of

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Torque

Angular momentum

Linear momentum

Power

Which of the following types 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

The ultimate source of money sources of energy is:

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Sun

Air

Water

Petroleum

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

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0°

90°

180°

None of these

A solar cell converts energy of the Sun into:

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Heat energy

Magnetic energy

Light energy

Sound energy

Which one is conservative force

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Electric force

Frictional force

Normal force

Air resistance

In the force applied is parallel to the direction of motion, then work done is:

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Maximum

Minimum

Zero

None of these

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

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

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Positive work

Negative work

Zero work

Infinte work

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

SI Unit of work is

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Nm^-1

Joule

Nms

Both a and b

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 and B is correct

Both A and B is correct

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

The work done moving a body between two points in a conservation field is independent of the:

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Direction

Force applied

Path followed by the body `

Power

The field in which work done in moving a body between two points depends upon the path followed is called:

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Conservative field

Non-conservative field

Electric field

None of these

Work done along a closed path in a gravitational field is:

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Maximum

Minimum

Zero

Unity

A laborer carrying a load on his head moves from the 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

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

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Moon

Sun

Oceans

Water

The work performed on an object does not depend on

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Force applied

Angle at which force is inclined to the displacement

Initial velocity of the object

Displacement

Which force is not a conservative force?

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Frictional force

Gravitational force

Electric force

Elastic spring force

Tick the conservation force:

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Tension in a string

Air resistance force

Elastic spring

Frictional force

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