Question # 1

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

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Maximum

Minimum

Zero

Unity

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

Work done by the force of friction is always

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Positive

Zero

Negative

Maximum

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

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Conservative filed

Non-conservative field

Electric field

None of these

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°

The consumption of energy by a 60 W bulb in 2 minutes is:

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2 watt-hour

120 watt-hour

30 watt-hour

None of these

Work-energy principle states that work done on the body by applied force is equal to change in:

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Potential energy

Kinetic nergy

Linear momentum

None of these

The space around the earth within it exerts a force of attraction on other bodies of known as:

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Nuclear field

Conservative field

Electric field

Gravitational field

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

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Zero J

1 J

0.1 J

0.01 J

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

The ultimate source of money sources of energy is:

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Sun

Air

Water

Petroleum

A solar cell is made from:

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Iron

Silicon

Germanium

Copper

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°

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

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

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0°

90°

180°

None of these

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

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