Question # 1

The commercial unit of electrical energy is :

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K Watt

KWH

Horse power

Joule

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

Work done by the force of friction is always

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Positive

Zero

Negative

Maximum

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.

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

A solar cell converts energy of the Sun into:

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Heat energy

Magnetic energy

Light energy

Sound energy

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

A solar cell is made from:

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Iron

Silicon

Germanium

Copper

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°

The dimensions of work

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[MLT^-1]

[MLT^-2]

[ML²T^-2]

[MLT]

Work done is maximum when angle between force and displacement is

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0°

90°

180°

None of these

A 100 kg car is moving at a speed of 10 m/sec and comes to rest after covering a distance of 50 m. the amount of work done against friction is:

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+5 x 10¹J

+5 x 10²J

+5 x 10³J

+5 x 10⁴J

Work done along a closed path in a gravitational field is:

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Maximum

Minimum

Zero

Unity

Most of the geysers occur in:

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Volcanic regions

Magnetic regions

Northern region

None of these

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 has the dimensions as that of

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Torque

Angular momentum

Linear momentum

Power

When a body 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

When force and displacement are perpendicular to each other than work is equal to

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Unity

Infinity

Zero

-Fd

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

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Potential

Chemical

Mechanical

sound and heat

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

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

Which force is not a conservative force:

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Frictional force

Gravitational force

Electric force

Elastic spring force

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

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

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

1 J = ________?

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10⁷erges

10^-7erges

10⁵erges

10^-5erges

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

Work has the dimension as that of:

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Torque

Angular momentum

Linear momentum

Power

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 energy stored int he water of the dam is:

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Electric energy

Kinetic energy

Potential energy

None of these

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

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0°

90°

180°

None of these

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