Question # 1

When a wall is pushed by a person very strongly, he has done:

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Maximum work

Zero work

Positive work

Negative work

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

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

Which one is conservative force

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Electric force

Frictional force

Normal force

Air resistance

Work done is independent of path followed in _______

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Gravitational field

Magnetic field

Electric field

All of these

Work done is lowering the bucket into the well is:

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Zero

Positive

Negative

None of these

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

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Potential

Chemical

Mechanical

sound and heat

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:

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Scalar quantity

Vector quantity

Base quantity

None of these

Work done in lower and bucket into the well is:

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Zero

Positive

Negative

None of these

Work has the dimensions as that of

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Torque

Angular momentum

Linear momentum

Power

SI Unit of work is

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Nm^-1

Joule

Nms

Both a and b

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 body moves a distance of 10 m among a straight line under the action of a force of 5 N. If the work done is 25 J, the angle which the force makes with the direction of motion of a body is:

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0°

30°

60°

90°

If force and displacement are in opposite direction, the work done is taken as:

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Positive work

Negative work

Zero work

Infinte work

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

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