Power and Energy MCQs | Power and Energy Multiple Choice Questions with Answers

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Questions
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

Answer: 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

Answer: All of the above
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63 In Force vs Displacement graph, What does the area under the curve represents :
A Velocity
B Acceleration
C Force
D Work done

Answer: 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

Answer: increases
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

Answer: negative
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

Answer: 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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