Question # 1

The commercial unit of electrical energy is :

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K Watt

KWH

Horse power

Joule

If one newton force acts on a body and displaces the body through 1m work done on body is

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1 dyne

1 joule

1KJ

1 Watt

The tidal energy is produced due to rotation of Earth relative to:

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Moon

Sun

Oceans

Water

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

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

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

The tidal energy is due to gravitational pull of :

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sun

moon

Mars

None of these

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

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0°

90°

180°

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

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

The unit of work in CGS system is

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Joule

Erg

Dyne

Watt

Work is a:

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Scalar quantity

Vector quantity

Base 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

Work done is independent of path followed in _______

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Gravitational field

Magnetic field

Electric field

All of these

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

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