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WAEC WASSCE 2017

WAEC Physics 2017 past questions

6 objective questions from the 2017 WAEC Physics paper. Answer each one, then reveal the answer and explanation.

All WAEC Physics past questions

  1. Question 1

    Heat

    How much heat is needed to raise the temperature of 2.5 kg of iron by 15 °C? (Specific heat capacity of iron = 460 J/kg K.)

    1. Option A: 8,625 J
    2. Option B: 1,150 J
    3. Option C: 17,250 J
    4. Option D: 6,900 J
    Show the answer to question 1

    Answer: C, 17,250 J

    Q = mcΔθ = 2.5 × 460 × 15 = 17,250 J.

  2. Question 2

    Work and energy

    Calculate the kinetic energy of a 10 kg body moving at 4 m/s.

    1. Option A: 80 J
    2. Option B: 160 J
    3. Option C: 20 J
    4. Option D: 40 J
    Show the answer to question 2

    Answer: A, 80 J

    KE = ½mv² = ½ × 10 × 4² = 80 J.

  3. Question 3

    Current electricity

    A potential difference of 10.8 V is applied across a 27 Ω resistor. Find the current that flows.

    1. Option A: 291.6 A
    2. Option B: 2.5 A
    3. Option C: 0.8 A
    4. Option D: 0.4 A
    Show the answer to question 3

    Answer: D, 0.4 A

    By Ohm's law, I = V ÷ R = 10.8 ÷ 27 = 0.4 A.

  4. Question 4

    Motion

    A car moving at 3 m/s accelerates uniformly at 2 m/s² for 7 s. Find its final velocity.

    1. Option A: 17 m/s
    2. Option B: 16 m/s
    3. Option C: 5 m/s
    4. Option D: 34 m/s
    Show the answer to question 4

    Answer: A, 17 m/s

    Use v = u + at = 3 + 2 × 7 = 17 m/s.

  5. Question 5

    Units and measurement

    What is the SI unit of magnetic flux?

    1. Option A: Tesla
    2. Option B: Henry
    3. Option C: Gauss
    4. Option D: Weber
    Show the answer to question 5

    Answer: D, Weber

    Magnetic flux is measured in webers (Wb).

  6. Question 6

    Pressure

    A force of 1300 N acts on an area of 0.4 m². Find the pressure exerted.

    1. Option A: 520 Pa
    2. Option B: 3,250 Pa
    3. Option C: 1,625 Pa
    4. Option D: 6,500 Pa
    Show the answer to question 6

    Answer: B, 3,250 Pa

    Pressure = force ÷ area = 1300 ÷ 0.4 = 3,250 Pa.

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