Question # 1

When velocity of moving body is doubled, the quantity which is also doubled is its:

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K.E.

Acceleration

Momentum

P.E.

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

Tick the conservation force:

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Tension in a string

Air resistance force

Elastic spring

Frictional force

Work has the dimension as that of:

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Torque

Angular momentum

Linear momentum

Power

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

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

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Maximum

Minimum

Zero

Unity

Work is a 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 are correct

Escape velocity from surface of Moon as compared to that from Earth surface is:

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Greater

Smaller

Equal

None of thes

The work done on the body will be zero if:

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No force is applied on the body

Force is applied but no displacement

Angle between F(force) and d(displacement) is 90°

All of these are correct

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

When two protons are brought are brought closer potential energy of both of them:

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Increases

Decreases

Remains same

None of these

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

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

Most of the geysers occur in:

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Volcanic regions

Magnetic regions

Northern region

None of these

Work done in lower and bucket into the well is:

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Zero

Positive

Negative

None of these

When a body moves against the force of friction on a horizontal plane, the work done by the body is:

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Positive

Negative

Zero

None of these

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

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Positive

Negative

Zero

None of these

Which one is conservative force

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Electric force

Frictional force

Normal force

Air resistance

A solar cell converts energy of the Sun into:

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Heat energy

Magnetic energy

Light energy

Sound energy

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 ultimate source of money sources of energy is:

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Sun

Air

Water

Petroleum

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 with the direction of motion will be:

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60°

90°

30°

0°

Teh consumption of energy by a 1000 watt heater in half an hour is:

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5 Kwh

0.5 Kwh

2.5 Kwh

3.2 Kwh

Work done by the force of friction is always

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Positive

Zero

Negative

Maximum

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

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0°

90°

180°

None of these

The commercial unit of electrical energy is :

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K Watt

KWH

Horse power

Joule

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

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Unity

Infinity

Zero

-Fd

The value of escape velocity of Earth planet comes out to be:

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11 m/sec

11 km/sec

11 km/hour

11 cm/sec

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

The angle between centripetal force and displacement of the body moving in a circle is:

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0°

90°

180°

None of these

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