Question # 1

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 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

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

Which force is not a conservative force:

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Frictional force

Gravitational force

Electric force

Elastic spring force

Work done is independent of path followed in _______

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Gravitational field

Magnetic field

Electric field

All 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 of the following is not a unit of power:

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J-sec

Watt

N m/sec

Horsepower

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

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

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Greater

Smaller

Equal

None of thes

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°

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

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0°

90°

180°

None of these

If we draw a graph between d (along x-axis) and F (along y-axis) and get a straight line horizontal to x-axis, then area under this straight line represents:

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Power

Work

Pressure

None of these

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

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Nuclear field

Conservative field

Electric field

Gravitational field

Tick the conservative force

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Tension in a string

Air resistance

Elastic spring

Frictional force

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

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

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

Work has the dimensions as that of

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Torque

Angular momentum

Linear momentum

Power

Area under the force displacement graph gives

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Power

Work

Heat

Energy

Work is a

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Scalar quantity

Vector quantity

Base quantity

None of these

If we draw a graph between d(along x-axis) and F (along y-axis) and get a straight line horizontal to x-axis then area under this straight line represents:

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Power

Work

Pressure

None of these

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.

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

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0°

90°

180°

None of these

The amount of coal used since 1945 up till now as compared to that used in the whole of history before that is

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Much more

Very small

No amount at all

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

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

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

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Maximum

Minimum

Zero

Negative

Work done is lowering the bucket into the well is:

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Zero

Positive

Negative

None of these

The ultimate source of money sources of energy is:

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Sun

Air

Water

Petroleum

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