Question # 1

A body moves a distance of 10 m along a straight line under the action of a force of 5 N. If the work done is 25 J, the angle which force makes with the direction of motion of a body is:

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0°

30°

60°

90°

Which one is conservative force

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Electric force

Frictional force

Normal force

Air resistance

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

Power is a :

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Vector quantity

Base quantity

Scalar quantity

None of these

When a falling body hits ground, its KE changes to _____ energy.

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Potential

Chemical

Mechanical

sound and heat

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 by the force of friction is always

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Positive

Zero

Negative

Maximum

The work done in moving a body between two points in a conservative field is independent of the

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Direction

Force applied

Path followed by the body

Power

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 is moving body between two points depends upon the path followed is called:

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Conservative filed

Non-conservative field

Electric field

None of these

Work has the dimension as that of:

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Torque

Angular momentum

Linear momentum

Power

Work done is maximum when angle between force and displacement is

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0°

90°

180°

None of these

Work-energy principle states that work done on the body by applied force is equal to change in:

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Potential energy

Kinetic nergy

Linear momentum

None of these

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

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 done is independent of path followed in _______

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Gravitational field

Magnetic field

Electric field

All of these

A solar cell converts energy of the Sun into:

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Heat energy

Magnetic energy

Light energy

Sound energy

Which of the following type 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

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 the direction of motion will be:

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60°

90°

30°

0°

A solar cell is made from:

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Iron

Silicon

Germanium

Copper

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

Area under the force displacement graph gives

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Power

Work

Heat

Energy

Energy stored in the spring of a watch is called

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Potential energy

Kinetic energy

Nuclear energy

Elastic potential

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°

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

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°

The power of an electric generating station is expressed in:

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Kilo Jule

Kilowatt-hour

Kilo watt

Watt

The work done in 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

The types of mechanical energy is/are:

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Kinetic energy

Potential energy

Both of these

None of these

Tick the conservative force

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Tension in a string

Air resistance

Elastic spring

Frictional force

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