Question # 1

Mathematically, % efficiency is defined as & nbsp

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Efficiency % required form or input/ total input energy x 100

Efficiency % input energy / output energy x 100

Efficiency % work / time x 100

One liter is equal to:

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1 kgcm-3

1000 cm-3

10-6 m3

10-3 m3

Formula of Gravitational potential energy is:

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mgh

mg/h

1/2 mv²

None of these

P.E is equal to:

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mgh

1/2 mv²

W x F

None of these

_____________ is an other unit of power.

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J

W

hp

W/J

Einstein's mass-energy equation relation is:

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E =1/2 mc²

E =mc²

E =m²c

E = 2 mc²

Which of the following is non-renewable fossil fuel?

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Oil

Coal

Gas

All of these

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

What kind of waste is produced by nuclear power plant?

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Carbon di oxide

Radio active

Fuels

Toxic material

In Einstein's mass-energy equation, c is the

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Speed of sound

Speed of light

Speed of electron

Speed of Earth

A temperature rise in the environment disturbs life called:

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Air pollution

Land pollution

Noice pollution

Thermal pollution

If the force of 25 N pulls a stone through a distance of 5 cm in its direction the magnitude of work will be:

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5 J

125 J

175 J

200 J

The energy stored in dam is:

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Potential energy

Kinetic energy

Chemical enegy

Nuclear energy

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9th Class Physics Chapter 6 Work and Energy English Medium KPK Boards Online Mcqs MCQs With Answers

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