Question # 1

Above of mass 50 kg is raised to a height of 3m. what is its P.E

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500 J

1000 J

1500 J

2000 J

The speed of light is equal to:

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3 x 10⁵ ms^-1

3 x 10⁸ms^-1

3 x 10⁹ms^-1

3 x 10²ms^-1

In Einstein's mass-energy equation c means speed of light. Its value is:

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3 x 10^-8 ms^-1

3 x 10⁸ms^-1

3 x 10⁹ms^-1

3 x 10¹⁸ms^-1

If velocity of a body becomes half that its energy K.E will be decrease to:

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Zero

Half

Double

4 Times

According to law of conservation of energy increases in P.E is equal to:

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Increase K.E

Decrease in K.E

Decrease in P.E

None

Fossil fuels are usually:

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Carbon di oxide

Hydrogen

Hydrocarbons

Carbon monoxide

A body possesses if it is capable to do work:

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Energy

Power

Force

All

What kind of waste is produced by nuclear power plant?

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Carbon di oxide

Radio active

Fuels

Toxic material

If a person is not moving when he lifts a load on his head work is:

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FS

FS Cos𝜽

FS Sin𝜽

0

The energy of a body during the motion is called:

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Potential energy

Kinetic energy

Elastic P.E.

Heat energy

Kinetic energy is possessed by a body by:

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Virtue of motion

Height

Rest

Nil

The S.I unit of efficiency is :

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J/s

Nm

watt

It has no unit

A body OF mass 10 kg taken to height of 5m:

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P.E = 500 J

P.E = 50 J

P.E = 5 J

P.E = 5000 J

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