Question # 1

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

Work is 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 is correct

Work is a:

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Scalar quantity

Vector quantity

Base quantity

None of these

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

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Direction

Force applied

Path followed by the body

Power

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

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0°

90°

180°

None of these

When the body is moves against the force of friction on a horizontal plane, the work done by the body is:

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Positive

Negative

Zero

None of these

1 J = ________?

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10⁷erges

10^-7erges

10⁵erges

10^-5erges

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°

The Space around the Earth within which it exerts a force of attraction on other bodies is known as

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Nuclear field

Conservative field

Electric field

Gravitational field

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

Power is a :

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Vector quantity

Base quantity

Scalar quantity

None of these

Which force is not a conservative force:

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Frictional force

Gravitational force

Electric force

Elastic spring force

Work done is independent of path followed in _______

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Gravitational field

Magnetic field

Electric field

All of these

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

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Zero J

1 J

0.1 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

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