Question # 1

The power needed to lift amass of 5000g to height of 1min 2 second is

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2.45 watt

24.5 watt

245 watt

2.45 k watt

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

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%

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

A man pushes a wall and fails to displace it. He does:

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Negative work

Positive but not maximum work

No work at all

Maximum work

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

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

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

A 50 kg man with 20 kg load on his head climbs up 20 steps of 0.25 m height each. The work done in climbing is

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5 J

350 J

100 J

3430 J

3 joules of work is done in 3 seconds, then power is:

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6 watt

3 watt

18 watt

1 watt

Which of the following is a unit of energy?

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unit

whatt

Horse Power

None of the above

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

The same retarding force is applied to stop a train. The train stops after 80 m. If the speed is doubled, then the Stopping distance will be:

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The same

Doubled

Halved

Four times

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

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100 %

150 %

√300%

175 %

A motor boat is travelling with a speed of 3.0 m/sec. If the force on it due to water flow is 500 N, the power of the boat is

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150 KW

1.5 KW

heat energy

chemical energy

A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6 ms¹ The KE of other mass is

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324 J

256 J

245 J

524 J

A man M₁ of mass 80 kg runs up a staircase in 15s. Another man M₂ also of mass 80 kg runs up the same staircase in 20s. The ratio of the power developed by them will be

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1

4/3

16/9

none of these

The energy stored in wound watch spring is

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K.E.

P.E.

heat energy

chemical energy

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

A body of mass 3 Kg lies on the surface on the table 2m high. It is moved on the surface by 4m. The change of P.E will be:

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Zero

9.8 J

19.6 J

329 J

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