Question # 1

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 is a:

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Scalar quantity

Vector quantity

Base quantity

None of these

If work is done at the rate of 2 k j per second, then total work done is half an hour will be:

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0.5 Kwn

2 Kwh

1 Kwh

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

The tidal energy is due to gravitational pull of :

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sun

moon

Mars

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

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

A 2 kg block is held 1 m above floor for 50 seconds. The work done is:

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Zero

10.2 J

100 J

980 J

The unit of work in CGS system is

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Joule

Erg

Dyne

Watt

A boy pulls a toy car through a distance of 5 m by applying a force of 0.5 N, which makes and 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

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

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0°

90°

180°

None of these

A solar cell is made from:

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Iron

Silicon

Germanium

Copper

Work is product of:

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Force and velocity

Heat and energy

Force and displacement

None of these

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

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

Work has a dimension as that of:

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Torque

Angular momentum

Linear momentum

Power

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