Question # 1

Energy stored in the spring of a watch is called

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Potential energy

Kinetic energy

Nuclear energy

Elastic potential

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 work done by a force keeping an object in circular motion with constant speed is:

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Zero J.

0.1 J

1 J

0.01 J

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

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+5 X 10¹J

+5 X 10²J

+5 X 10³J

+5 X 10⁴J

Power is a :

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Vector quantity

Base quantity

Scalar quantity

None of these

The unit of work in CGS system is

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Joule

Erg

Dyne

Watt

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

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 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

Work is a scalar product of

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Force, Velocity

Velocity, Displacement

Force, Displacement

Force, Momentum

Which of the following is not a unit of power:

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J-sec

Watt

N m/sec

Horsepower

The total work done in moving the body up and then down through the same height in a gravitational field is equal to:

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mgh

Its wight

Weight X height

Zero

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

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Maximum

Minimum

Zero

Unity

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°

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

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

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