Question # 1

A solar cell converts energy of the Sun into:

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Heat energy

Magnetic energy

Light energy

Sound energy

Maximum work is done when force and displacement are

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Parallel

Antiparallel

Perpendicular

Both a and b

Tick the conservation force:

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Tension in a string

Air resistance force

Elastic spring

Frictional force

The tidal energy is due to gravitational pull of :

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sun

moon

Mars

None of these

Work done by the force of friction is always

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Positive

Zero

Negative

Maximum

The unit of work in CGS system is

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Joule

Erg

Dyne

Watt

The work done in moving a body between two points in a conservation field is independent of the:

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Direction

Force applied

Path followed by the body

Power

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

SI Unit of work is

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Nm^-1

Joule

Nms

Both a and b

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

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Unity

Infinity

Zero

-Fd

A boy pulls a toy car through a distance of 5 m by applying a force of 0.5 N, which makes and angle of 60° with the horizontal. The work done by the boy is:

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1.25 J

12.5 J

125 J

None of these

Which one is conservative force

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Electric force

Frictional force

Normal force

Air resistance

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

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0°

90°

180°

None of these

Work is a:

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Scalar quantity

Vector quantity

Base quantity

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

The work done moving a body between two points in a conservation field is independent of the:

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Direction

Force applied

Path followed by the body `

Power

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

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