Question # 1

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.

Work is a always done on a body when

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A force acts on it

It moves through certain distance

None of A or B is correct

Both A and B are correct

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

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

A laborer carrying a load on his head moves from the 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

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

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Unity

Infinity

Zero

-Fd

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

The tidal energy is due to gravitational pull of :

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sun

moon

Mars

None of these

The commercial unit of electrical energy is :

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K Watt

KWH

Horse power

Joule

Which of the following is not a unit of power:

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J-sec

Watt

N m/sec

Horsepower

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

Watt x second is unit of:

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Force

Work

Power

None of these

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

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Maximum

Minimum

Zero

Unity

Escape velocity from surface of Moon as compared to that from Earth surface is:

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Greater

Smaller

Equal

None of thes

The types of mechanical energy is/are:

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Kinetic energy

Potential energy

Both of these

None of these

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ECAT Physics Chapter 4 Work and Energy Online Test MCQs With Answers

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