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9th Class Physics Chapter 6 Work and Energy English Medium KPK Boards Online Mcqs MCQs With Answers
Question # 1
The potential energy of a body of mass 'm' placed at a height 'h' above the surface of   earth is equal to
Choose an answer
P.E. = mg
P.E. = mgh
P.E. = 3mgh
P.E. = 2mgh
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Question # 2
The kinetic energy of the body of mass 1000 kg moving a speed of 20 ms
-1
will be:
Choose an answer
2 x 10
2
J
2 x 10
3
J
2 x 10
5
J
2 x 10
8
J
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Question # 3
Which of following units is equal to Kgm
2
s
-2
Choose an answer
Newton
Joule
Watt
Coloumb
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Question # 4
1 hp is equal to :
Choose an answer
747 W
746 W
748 W
1000 W
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Question # 5
The rate of doing work is called :
Choose an answer
Power
Work
Efficiency
None of above
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Question # 6
If mass of a body becomes half that its energy K.E will be reduce to:
Choose an answer
Zero
Half
Double
4 Times
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Question # 7
From following, which one is a renewable source of energy?
Choose an answer
Coal
Gas
Sunlight
Petrolum
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Question # 8
The power of electric kettle is 500W and takes 2s to heat up, find heat generated?
Choose an answer
E = 250 w
E = 1000 w
E = 10000 J
1KJ
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Question # 9
If the direction of motion of the force is perpendicular to the direction of motion of the body then work done will be:
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Maximum
Minimum
Zero
None of these
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Question # 10
Mathematically, % efficiency is defined as & nbsp
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Efficiency % required form or input/ total input energy x 100
Efficiency % required form or input/ total input energy x 100
Efficiency % input energy / output energy x 100
Efficiency % work / time x 100
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Question # 11
Work is zero when "F" and "S" will be:
Choose an answer
Parallel
Perpendicular
Anti parallel
Tangent
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Question # 12
SI unit of work is:
Choose an answer
Joule
Coulomb
Ampere
Kelvin
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Question # 13
hp stands for :
Choose an answer
1w
Horse power
Joule
All are true
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