Question # 1

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 stored in coal is:

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Heat energy

Kinetic energy

Chemical enegy

Nuclear energy

The energy present in our food is:

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Mechanical energy

Gravitational potential energy

Chemical energy

Nuclear energy

The S.I unit of power is:

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Newton

Watt

Joule

Coulomb

When a body is lifted through a height h, the work donw on it appears in the form of its.

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Kinetic energy

Potential energy

Elastic energy

Geothermal energy

Kinetic and potential energy are the kinds of energy:

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Chemical

Nuclear

Light

Mechanical

When a hammer raised up its energy will be:

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Mechanical energy

Gravitational potential energy

Chemical energy

Nuclear energy

The work done in lifting a brick of mass 2 kg through a height of 5 m above ground will be:

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2.5 J

10 J

50 J

100 J

The S.I unit of efficiency is :

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J/s

Nm

watt

It has no unit

Formula of Power:

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P = wt

P = w/t

P = t/w

P = w/t²

In a dam the water energy is called:

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Heat energy

Electrical energy

G.P.E

Mechanical enrgy

The kinetic energy of a body of mass 2 kg is 25J, its speed is

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5 ms-1

12.5 ms-1

25 ms-1

50 ms-1

The ratio of useful output to input energy is called:

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Power

Energy

Efficiency

Horse power

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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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