Question # 1

If the velocity of a body becomes half, the kinetic energy of body will become

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One fourth

Double

Four times

Half

If the momentum of a body is increased n times, its kinetic energy increases:

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n times

2 n times

√𝑛 times

n 2 time

A stone is thrown up from the surface of earth when it reaches at maximum height. its total energy is equal to

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mgh

1/2 𝑚𝑣²

zero

2mgh

An engine pumps up 100 kg of water through a height of 10m in 5s. Given that the efficiency of the engine is 60%, what is the power of the engine? (Take g = 10ms^-2)

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33 kW

3.3kW

0.33kW

0.033kW

Work done in raising a box depends on:

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How fast it is raised

The strength of the man

The height by which it is raised

None of the above

A person weighing 20 mg walks on a level platform with a speed of 2 ms-1 . The work by the person against the force of gravity is:

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Zero

2J

60J

600J

When a person lifts a body from ground work done by lifting force is?

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Positive

Negative

Zero

Half of positive maximum

If the K.E. of a body is increased by 300%, its momentum will increase by:

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100 %

150 %

√300%

175 %

If the stone is thrown up vertically and return to ground, its potential energy is maximum

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during the upward journey

at the maximum height

at the bottom

A body is dropped from a height of 20 m and rebounds to a height of 10 m. the loss of energy is:

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10%

45%

50%

75%

A force of 6 N act horizontally on a stationary mass of 2kg for 4s. The kineticenergy in joule is

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12

72

56

888

. A force "F1" acts on a body through distance "S1" in the direction of motion and does work "W1". Similarly another force "F2" act on same body through distance "S2" but in opposite to the direction of motion and does work "W2". Now if F1 = F2 and S1 = S2 then which statement is correct.

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W1 = W2

W2< W2

W1 > W2

W1 = W2= 0

A ball is thrown vertically upwards. Neglecting air resistance, which statement is correct?

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The kinetic energy of the ball is greatest at the greatest height attained

The potential energy of the ball increase uniformly with time during the ascent

By the principle of conservation of momentum. The momentum of the ball is constant throughout its motion

By the principle of conservation of energy, the total energy of the ball is constant throughout its motion

An electric motor exerts a force of 40 N on a cable and pulls it by a distance of 30 m in one minute. The power supplied by the motor in watts is

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20

200

2

10

A body of mass m kg is lifted by a man to a height of one meter in 30 sec. Another man lifts the same mass to the same height in 60 sec. The work done by them are in the ratio

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1: 2

1: 1

2: 1

4: 1

The momentum of a particle is numerically equal to its K.E. What is the velocity of a particle?

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9 ms^-1

3 ms^-1

2 ms-1

1 ms^-1

When the velocity of a body is doubled:

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Its K.E is doubled

Its P.E is doubled

Its momentum is doubled

Its acceleration is doubled

The energy stored in wound watch spring is

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K.E.

P.E.

heat energy

chemical energy

The gravity does no work, when the body moves:

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Horizontally

Vertically upwards

Vertically downward

At an angle of 45o with horizontal

An engine pumps out 40 kg of water in one second. The water comes out vertically upwards with a velocity of 3ms-1 . What is the power of engine in kilowatt?

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1.2kW

120kW

12kW

1200kW

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