Question # 1

Work is a Quantity

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Vector

Scalar

Non-physical

None of these

Energy stored in the spring of a watch is called

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Potential energy

Kinetic energy

Nuclear energy

Elastic potential

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

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0°

90°

180°

None of these

The angle between centripetal force and displacement of the body moving in a circle is:

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0°

90°

180°

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 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 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

The work performed on an object does not depend on:

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Force applied

Angle at which force is inclined to the displacement

Initial velocity of the object

Displacement

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

SI Unit of work is

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Nm^-1

Joule

Nms

Both a and b

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

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

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

A solar cell converts energy of the Sun into:

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Heat energy

Magnetic energy

Light energy

Sound energy

The ultimate source of money sources of energy is:

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Sun

Air

Water

Petroleum

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

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Nuclear Field

Conservative field

Gravitational field

Non-conservative field

The tidal energy is produced due to rotation of Earth relative to:

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Moon

Sun

Oceans

Water

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

Work has the dimensions as that of

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Torque

Angular momentum

Linear momentum

Power

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

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Maximum

Minimum

Zero

Negative

1 J = ________?

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10⁷erges

10^-7erges

10⁵erges

10^-5erges

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

The tidal energy is due to gravitational pull of :

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sun

moon

Mars

None of these

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°

Most of the geysers occur in:

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Volcanic regions

Magnetic regions

Northern region

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

A solar cell is made from:

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Iron

Silicon

Germanium

Copper

A laborer carrying a load on his head moves from the 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

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

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

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