Question # 1

Work done is lowering the bucket into the well is:

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Zero

Positive

Negative

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

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

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°

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.

A solar cell is made from:

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Iron

Silicon

Germanium

Copper

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

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

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

Which force is not a conservative force?

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Frictional force

Gravitational force

Electric force

Elastic spring force

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

Power is a :

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Vector quantity

Base quantity

Scalar quantity

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

The types of mechanical energy is/are:

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Kinetic energy

Potential energy

Both of these

None of these

SI Unit of work is

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Nm^-1

Joule

Nms

Both a and b

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

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