Question # 1

The unit of work in CGS system is

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Joule

Erg

Dyne

Watt

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

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

Work is a

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Scalar quantity

Vector quantity

Base quantity

None of these

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

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0°

90°

180°

None of these

The ultimate source of money sources of energy is:

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Sun

Air

Water

Petroleum

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

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Maximum

Minimum

Zero

Unity

A solar cell converts energy of the Sun into:

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Heat energy

Magnetic energy

Light energy

Sound energy

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 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

A field in which the work done is moving a body along closed path is zero is called:

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Nuclear filed

Conservative field

Gravitational field

Non-conservative field

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

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Maximum

Minimum

Zero

Negative

The tidal energy is due to gravitational pull of :

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sun

moon

Mars

None of these

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

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

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0°

90°

180°

None of these

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

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

The commercial unit of electrical energy is :

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K Watt

KWH

Horse power

Joule

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

When a wall is pushed by a person very strongly, he has done:

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Maximum work

Zero work

Positive work

Negative work

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

A boy pulls a toy car through a distance of 5 m by applying a force of 0.5 N, Which makes an angle of 60° with the horizontal. The work done by the boy is:

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1.25 J

12.5 J

125 J

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

Work has a dimension as that of:

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Torque

Angular momentum

Linear momentum

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

A solar cell is made from:

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Iron

Silicon

Germanium

Copper

A field in which the work done in moving a body along closed path is zero is called

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Nuclear Field

Conservative field

Gravitational field

Non-conservative field

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

Work is a:

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Scalar quantity

Vector quantity

Base quantity

None of these

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