Question # 1

Maximum work is done when force and displacement are

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Parallel

Antiparallel

Perpendicular

Both a and b

When a body 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

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

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Positive work

Negative work

Zero work

Infinite work

Watt x second is unit of:

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Force

Work

Power

None of these

The consumption of energy by a 60 W bulb in 2 minutes is:

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2 watt-hour

120 watt-hour

30 watt-hour

None of these

A two Kg block is held 1 m above the floor for 50 seconds, the work done is:

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Zero

10.2 J

100 J

980 J

Work is a Quantity

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Vector

Scalar

Non-physical

None of these

A 2 kg block is held 1 m above floor for 50 seconds. The work done is:

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Zero

10.2 J

100 J

980 J

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

Work is a

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Scalar quantity

Vector quantity

Base quantity

None of these

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

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

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

Work has the dimensions as that of

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Torque

Angular momentum

Linear momentum

Power

Work done is maximum when angle between force and displacement is

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0°

90°

180°

None of these

The value of escape velocity of Earth planet comes out to be:

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11 m/sec

11 km/sec

11 km/hour

11 cm/sec

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

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Unity

Infinity

Zero

-Fd

1 J = ________?

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10⁷erges

10^-7erges

10⁵erges

10^-5erges

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 types of mechanical energy is/are:

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Kinetic energy

Potential energy

Both of these

None of these

Work has a dimension as that of:

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Torque

Angular momentum

Linear momentum

Power

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

The space around the earth within it exerts a force of attraction on other bodies of known as:

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Nuclear field

Conservative field

Electric field

Gravitational field

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 done by the force of friction is always

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Positive

Zero

Negative

Maximum

Power is a :

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Vector quantity

Base quantity

Scalar quantity

None of these

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

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Maximum

Minimum

Zero

Unity

In the force applied is parallel to the direction of motion, then work done is:

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Maximum

Minimum

Zero

None of these

Work is product of:

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Force and velocity

Heat and energy

Force and displacement

None of these

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