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WAEC (WASSCE) Physics10 questions

WAEC Physics practice questions

Ten objective questions in the style of WAEC WASSCE Physics: units, motion, vectors, electricity, waves, work, heat, the electromagnetic spectrum and momentum. Each one has a worked solution.

Original questions written by Studoli tutors in the style of the WAEC (WASSCE) exam. They are not official past questions.

  1. Topic: Units

    1. What is the SI unit of force?

    Solution

    B. Newton

    • Force is measured in newtons (N).
    • 1 N is the force that gives a 1 kg mass an acceleration of 1 m/s².

  2. Topic: Motion

    2. A car starts from rest and reaches 20 m/s in 5 s with uniform acceleration. Find its acceleration.

    Solution

    B. 4 m/s²

    • Acceleration = change in velocity ÷ time.
    • (20 − 0) ÷ 5 = 4 m/s².

  3. Topic: Scalars and vectors

    3. Which of the following is a vector quantity?

    Solution

    C. Velocity

    • A vector has both magnitude and direction.
    • Velocity is speed in a given direction, so it is a vector. Mass, speed and energy are scalars.

  4. Topic: Current electricity

    4. A conductor carries a current of 3 A when the potential difference across it is 12 V. Find its resistance.

    Solution

    B. 4 Ω

    • Ohm's law: R = V ÷ I.
    • R = 12 ÷ 3 = 4 Ω.

  5. Topic: Current electricity

    5. Two 6 Ω resistors are connected in parallel. What is their combined resistance?

    Solution

    A. 3 Ω

    • For two resistors in parallel: 1/R = 1/6 + 1/6 = 2/6.
    • R = 6 ÷ 2 = 3 Ω.

  6. Topic: Waves

    6. A wave has a frequency of 50 Hz and a wavelength of 2 m. Find its speed.

    Solution

    D. 100 m/s

    • Wave speed v = fλ.
    • v = 50 × 2 = 100 m/s.

  7. Topic: Work and energy

    7. Calculate the work done in lifting a 10 kg load through a height of 2 m. (g = 10 m/s²)

    Solution

    C. 200 J

    • Work done = force × distance, and the force needed is the weight mg.
    • W = 10 × 10 × 2 = 200 J.

  8. Topic: Heat

    8. How much heat is needed to raise the temperature of 2 kg of water by 10 °C? (c = 4200 J/kg °C)

    Solution

    D. 84,000 J

    • Heat Q = mcΔθ.
    • Q = 2 × 4200 × 10 = 84,000 J.

  9. Topic: Electromagnetic waves

    9. Which electromagnetic wave has the shortest wavelength?

    Solution

    D. Gamma rays

    • Gamma rays have the highest frequency in the electromagnetic spectrum.
    • Highest frequency means shortest wavelength.

  10. Topic: Momentum

    10. Find the momentum of a 5 kg object moving at 4 m/s.

    Solution

    C. 20 kg m/s

    • Momentum p = mv.
    • p = 5 × 4 = 20 kg m/s.
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