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Free download in PDF Power and Energy Multiple Choice Questions with Answers for competitive exams. These objective type questions are very important for competitive exams like IIT-JEE, NEET, AIIMS, JIPMER etc. These short solved questions or quizzes are provided by Gkseries.
61
A body is moving with velocity 4 m/s , possesses 56 Joules of Kinetic Energy. The momentum of body will be equal to
[A]
7 kgms-1
[B]
14 kgms-1
[C]
21 kgms-1
[D]
28 kgms-1
62
Which of the following is correct?
[A]
A fruit hanging from the tree possesses gravitational potential energy
[B]
A running player acquires Kinetic Energy
[C]
A piston with compressed air contains potential energy
[D]
All of the above
63
In Force vs Displacement graph, What does the area under the curve represents :
[A]
Velocity
[B]
Acceleration
[C]
Force
[D]
Work done
64
According to the law of conservation of energy, which of the statements given below is correct ?
[A]
Energy can not be transformed from one form to another
[B]
It can be created or destroyed
[C]
The total energy before and after the transformation always remains constant
[D]
The total energy before and after the transformation is always different
Answer: The total energy before and after the transformation always remains constant
65
When we stretch a rubber band, the Elastic Potential Energy of rubber band
[A]
remains unchanged
[B]
becomes zero
[C]
increases
[D]
decreases
66
A cyclist is moving at a speed of 5 m/s on leveled road. While going down the slop, his speed increases to 7 m/s. Here the nature of work done by gravitational force in increasing the speed of cyclist is an example of ?
[A]
positive work done
[B]
negative work done
[C]
Infinite work done
[D]
Zero work done
Answer: positive work done
67
As per the statement given in Q.9 above, What change it will take place for the potential energy of the car
[A]
It will remain the same
[B]
It will increase
[C]
It will decrease
[D]
It will becomes 3 times the Intial P.E.
Answer: It will remain the same
68
A runner, while moving, is facing a wind from the opposite direction. The work done by the wind on runner will be
[A]
Zero
[B]
negative
[C]
Positive
[D]
infinity
69
The commercial unit of energy consumption in households, industries and commercial establishments is
[A]
Joule
[B]
Watt
[C]
kW
[D]
KW h (kilowatt hour)
Answer: KW h (kilowatt hour)
70
Which of the following does not have unit as Joule?
[A]
Work done
[B]
Kinetic energy
[C]
Potential energy
[D]
Force
71
In winters, rubbing of hands together for some time, causes a sensation of warmth mainly because of
[A]
heat caused by the force of friction
[B]
heat caused by the momentum
[C]
heat caused by the motion
[D]
heat flows from the blood to skin
Answer: heat caused by the force of friction
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