Question # 1

A solar cell is made from:

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Iron

Silicon

Germanium

Copper

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

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Maximum

Minimum

Zero

Negative

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

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

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

Which of the following is not a unit of power:

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J-sec

Watt

N m/sec

Horsepower

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

Power is a :

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Vector quantity

Base quantity

Scalar quantity

None of these

Work has a dimension as that of:

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Torque

Angular momentum

Linear momentum

Power

The tidal energy is due to gravitational pull of :

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sun

moon

Mars

None of these

Work is a scalar product of

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Force, Velocity

Velocity, Displacement

Force, Displacement

Force, Momentum

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

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 is maximum when angle between force and displacement is

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0°

90°

180°

None of these

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

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

Work done is independent of path followed in _______

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Gravitational field

Magnetic field

Electric field

All 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 dimensions of work

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[MLT^-1]

[MLT^-2]

[ML²T^-2]

[MLT]

Work is a:

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Scalar quantity

Vector quantity

Base quantity

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 in 25J. The angle which the force makes with the direction of motion will be

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60°

90°

30°

0°

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°

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 has the dimensions as that of

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Torque

Angular momentum

Linear momentum

Power

Watt x second is unit of:

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Force

Work

Power

None of these

Work done by the force of friction is always

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Positive

Zero

Negative

Maximum

Which force is not a conservative force?

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Frictional force

Gravitational force

Electric force

Elastic spring force

The energy stored int he water of the dam is:

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Electric energy

Kinetic energy

Potential energy

None of these

Work is a:

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Scalar quantity

Vector quantity

Base quantity

None of these

When the body is 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 is parallel to the direction of motion, then work done is:

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Maximum

Minimum

Zero

None of these

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