Question # 1

A temperature rise in the environment disturbs life called:

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Air pollution

Land pollution

Noice pollution

Thermal pollution

The potential energy of a body of mass 'm' placed at a height 'h' above the surface of earth is equal to

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P.E. = mg

P.E. = mgh

P.E. = 3mgh

P.E. = 2mgh

How many components are there of a solar heating system?

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2

3

4

5

The energy stored in coal is

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Heat energy

Kinetic energy

Chemical energy

Nuclear energy

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

The product of force and displacement is called;

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Work

Efficiency

Power

Energy

The ratio of useful output to input energy is called:

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Power

Energy

Efficiency

Horse power

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

Einstein's mass-energy equation relation is:

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E =1/2 mc²

E =mc²

E =m²c

E = 2 mc²

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

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

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Increase P.E

Decrease P.E

Decrease K.E

None of these

Work done is maximum when angle between force and displacement is:

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45°

0°

60°

90°

Which pair of physical quantities has same SI unit?

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energy , power

power , work

energy , work

work , momentum

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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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