Question # 1

A boy pulls a toy car through a distance of 5 m by applying a force of 0.5 N, Which makes an 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 a scalar product of

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Force, Velocity

Velocity, Displacement

Force, Displacement

Force, Momentum

A solar cell is made from:

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Iron

Silicon

Germanium

Copper

A solar cell converts energy of the Sun into:

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Heat energy

Magnetic energy

Light energy

Sound energy

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 is lowering the bucket into the well is:

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Zero

Positive

Negative

None of these

Work is product of:

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Force and velocity

Heat and energy

Force and displacement

None of these

Which force is not a conservative force?

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Frictional force

Gravitational force

Electric force

Elastic spring force

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 dimensions of work

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[MLT^-1]

[MLT^-2]

[ML²T^-2]

[MLT]

Watt x second is unit of:

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Force

Work

Power

None of these

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

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

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

Power is a :

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Vector quantity

Base quantity

Scalar 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

When velocity of moving body is doubled, the quantity which is also doubled is its:

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K.E.

Acceleration

Momentum

P.E.

Tick the conservation force:

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Tension in a string

Air resistance force

Elastic spring

Frictional force

The field in which work done is moving body between two points depends upon the path followed is called:

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Conservative filed

Non-conservative field

Electric field

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

The tidal energy is due to gravitational pull of :

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sun

moon

Mars

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

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

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

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

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

1 J = ________?

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10⁷erges

10^-7erges

10⁵erges

10^-5erges

Work has the dimension as that of:

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Torque

Angular momentum

Linear momentum

Power

Which force is not a conservative force:

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Frictional force

Gravitational force

Electric force

Elastic spring force

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

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