Quiz  /  Energy and Power Class 9 MCQ Questions With Answers

  • 1. 
    Stored energy in the form of position or condition.

  • potential energy
  • kinetic energy
  • momentum
  • mechanical energy

  • 2. 
    The diagram shows a man pushing a 20 kg box over a distance of 2 m.Calculate the work done by the man.( g = 10 N kg-1)

  • 10 J
  • 20 J
  • 40 J
  • 400 J

  • 3. 
    A worker climbs a ladder and does 8 J of work on a 2 N object. What is the distance they lift the object?

  • 18 m
  • 4 m
  • 10 m
  • 6 m

  • 4. 
    The diagram shows a worker lifting a weight of 20 kg.Calculate the work done by the worker by using the following formula.Work = Force x Displacement(g = 10N kg-1)

  • 14 J
  • 140 J
  • 1400 J
  • 14000 J

  • 5. 
    A worker uses 6000 J energy to push a wheel barrow in 5 minutes  . Calculate the power that he generated. Power =Work doneTimePower\ =\frac{Work\ done}{Time}Power =TimeWork done​

  • 20 W
  • 120 W
  • 200 W
  • 1200 W

  • 6. 
    The ability to do work or cause change:

  • work
  • energy
  • momentum
  • power

  • 7. 
    What is the unit of energy that electrical companies use?

  • kJ
  • kW
  • kJ/hour
  • kW/hour

  • 8. 
    Is the amount of energy being transferred over a period of time.

  • Power
  • Energy
  • Seconds
  • Joules

  • 9. 
    What is the difference between calculating power and work?

  • Power takes into account the time it takes to complete a task
  • Work takes into account the time it takes to complete a task
  • Power is force/area
  • Work is force/area

  • 10. 
    Where is the kinetic energy of pendulum at its highest?

  • at the top of the swing
  • at the bottom of the swing
  • at 1/4 of the swing
  • at 3/4 of the swing

  • 11. 
    All the following activities produce the same amount of work done EXCEPT

  • Lifting a box vertically through a height of 1 m with a force of 20N against the gravitational force.
  • Pushing a trolley over a distance of 2 m with a force of 10 N.
  • Pulling a drawer over a distance of 20 cm with a force of 1 N
  • Lifting up a stack of books weighing 20N to a vertical height of 100 cm.

  • 12. 
    Which of the following activities involves work?I Pulling a coconut treeII Stretching a springIII Jumping on the spotIV Leaning against a wall

  • I and II
  • II and III
  • III and IV
  • I and IV

  • 13. 
    Which of the following is NOT an example of a non-renewable energy source?

  • Coal
  • Nuclear
  • Hydro
  • Oil

  • 14. 
    The SI Unit for Energy is

  • Joule
  • Newton
  • Calorie
  • Watt

  • 15. 
    Which of the following activities involves work done?

  • An old man lying still on the floor
  • A boy running around a stadium
  • A girl holding a stack of books
  • A baby crying

  • 16. 
    The diagram shows a woman entering an elevator. When woman Q enters the elevator, the elevator moves up 30 m with 75 000 J gravitational potential energy. What is the mass of woman Q in kg?Gravitational potential energy = mgh(Gravitational force = 10 ms-2 )

  • 55
  • 60
  • 65
  • 70

  • 17. 
    Which situation is work not done?

  • lifting a 20 pound box off the floor
  • holding a 20 pound box above the floor
  • sliding a 20 pound box across the floor
  • sliding a 20 pound box up an inclined plane

  • 18. 
    Energy ___________________ drives our energy world.

  • creation
  • conversion
  • conservation
  • None of these

  • 19. 
    The diagram shows a man pushing against a wall. Which of the following statements describes the situation correctly?

  • A big amount of work is done as the man uses a big force to push the wall.
  • Gravitational force is involved when the man pushes the wall.
  • No work done in this situation as the wall is not displaced.
  • There is no work done because the wall is too heavy.

  • 20. 
    The diagram shows the activity carried out by a student. The 2 kg trolley is pushed towards a wooden block so that the spring is compressed to 20 cm. The trolley is then released and the spring returns to its original length.If the force used to compress the spring is 60 N, calculate the velocity of the trolley after it is released. 12Fx = 12mv2\frac{1}{2}Fx\ =\ \frac{1}{2}mv^221​Fx = 21​mv2

  • 2ms-1
  • 3 ms-1
  • 5 ms-1
  • 30 ms-1

  • 21. 
    The table shows the information about four students who walk up the stairs of 3 m high. Which student has the greatest power? Power = Work doneTimePower\ =\ \frac{Work\ done}{Time}Power = TimeWork done​

  • Ahmad
  • Jamal
  • Ramesh
  • Joshua
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