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WAEC Physics Practice Questions & Explanations

Try 20 of 367+ WAEC Physics questions as a free quiz — select your answers, submit, and see your score with a full explanation for every one.

  1. 1.

    The SI unit of force is

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    Force is measured in newtons (N) in the SI system. One newton is the force required to accelerate a 1 kg mass at 1 m/s².

  2. 2.
    A force of 20 N moves a body through a distance of 5 m in the direction of the force. Calculate the work done.
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    Work done = Force × Distance = 20 × 5 = 100 J.
  3. 3.
    Which of the following is the SI unit of work?
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    The SI unit of work is the joule (J).
  4. 4.
    A machine does 600 J of work in 20 s. What is its power output?
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    Power = Work ÷ Time = 600 ÷ 20 = 30 W.
  5. 5.
    A body of mass 2 kg is raised to a height of 10 m. Take g = 10 m/s². Calculate its gravitational potential energy.
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    Potential Energy = mgh = 2 × 10 × 10 = 200 J.
  6. 6.
    What is the kinetic energy of a 4 kg object moving at 5 m/s?
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    KE = 1/2 mv² = 1/2 × 4 × 5² = 50 J.
  7. 7.
    A force acts on an object but produces no displacement. The work done is
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    Work done = Force × Displacement. If displacement is zero, work done is zero.
  8. 8.
    The rate of doing work is known as
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    Power is defined as the rate of doing work.
  9. 9.
    A machine with an efficiency of 80% receives 500 J of energy input. What is its useful output energy?
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    Output Energy = 0.8 × 500 = 400 J.
  10. 10.
    A 100 W bulb is used for 5 hours. How much energy does it consume?
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    Energy = Power × Time = 100 × 5 = 500 Wh.
  11. 11.
    Which form of energy does a stretched spring possess?
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    A stretched spring stores elastic potential energy.
  12. 12.
    The S.I. unit of length is?
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    The S.I. base unit of length is the meter (m).
  13. 13.
    Which of the following is a fundamental physical quantity?
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    Mass is a fundamental quantity, while the others are derived quantities.
  14. 14.
    The instrument used to measure length accurately is?
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    A meter rule is used to measure length.
  15. 15.
    The S.I. unit of time is?
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    The SI base unit of time is the second (s).
  16. 16.
    Which of the following is a derived unit?
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    Newton is a derived unit of force.
  17. 17.
    The S.I. unit of force is?
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    Force is measured in Newton (N).
  18. 18.
    Which instrument is used to measure temperature?
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    A thermometer measures temperature.
  19. 19.
    The S.I. unit of mass is?
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    The SI unit of mass is kilogram (kg).
  20. 20.
    Which of the following is NOT a fundamental quantity?
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    Velocity is a derived quantity.
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