Question # 1

The tidal energy is due to gravitational pull of :

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sun

moon

Mars

None of these

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

The types of mechanical energy is/are:

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Kinetic energy

Potential energy

Both of these

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

SI Unit of work is

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Nm^-1

Joule

Nms

Both a and b

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

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+5 x 10¹J

+5 x 10²J

+5 x 10³J

+5 x 10⁴J

Work done is maximum when angle between force and displacement is

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0°

90°

180°

None of these

Maximum work is done when force and displacement are

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Parallel

Antiparallel

Perpendicular

Both a and b

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

A field in which the work done is moving a body along closed path is zero is called:

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Nuclear filed

Conservative field

Gravitational field

Non-conservative field

Which force is not a conservative force:

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Frictional force

Gravitational force

Electric force

Elastic spring force

A body moves a distance of 10 m along a straight line under the action of a force of 5 N and work done in 25J. The angle which the force makes with the direction of motion will be

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60°

90°

30°

0°

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°

The work done on the body will be zero if:

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No force is applied on the body

Force is applied but no displacement

Angle between F(force) and d(displacement) is 90°

All of these are correct

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

When two protons are brought are brought closer potential energy of both of them:

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Increases

Decreases

Remains same

None of these

The power of an electric generating station is expressed in:

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Kilo Jule

Kilowatt-hour

Kilo watt

Watt

Work is a

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Scalar quantity

Vector quantity

Base quantity

None of these

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

Work done by the force of friction is always

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Positive

Zero

Negative

Maximum

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

The dimensions of work

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[MLT^-1]

[MLT^-2]

[ML²T^-2]

[MLT]

Work done on a body by gravity in lifting it up to certain height is

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Maximum

Minimum

Zero

Negative

The commercial unit of electrical energy is :

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K Watt

KWH

Horse power

Joule

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

Power is a :

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Vector quantity

Base quantity

Scalar quantity

None of these

Teh consumption of energy by a 1000 watt heater in half an hour is:

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5 Kwh

0.5 Kwh

2.5 Kwh

3.2 Kwh

If work is done at the rate of 2 k j per second, then total work done is half an hour will be:

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0.5 Kwn

2 Kwh

1 Kwh

None of these

Work done is independent of path followed in _______

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Gravitational field

Magnetic field

Electric field

All of these

Watt x second is unit of:

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Force

Work

Power

None of these

A labourer carrying a distance a load on his head moves from rest on a horizontal road to another point where he comes to rest. He has done:`

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Minimum work

Maximum work

Zero work

Negative work

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