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WAEC WASSCE 2020

WAEC Physics 2020 past questions

7 objective questions from the 2020 WAEC Physics paper. Answer each one, then reveal the answer and explanation.

All WAEC Physics past questions

  1. Question 1

    Current electricity

    Calculate the current through a 6 Ω resistor connected across a 12 V battery.

    1. Option A: 0.5 A
    2. Option B: 2 A
    3. Option C: 6 A
    4. Option D: 72 A
    Show the answer to question 1

    Answer: B, 2 A

    By Ohm’s law, I = V ÷ R = 12 ÷ 6 = 2 A.

  2. Question 2

    Density

    A sample of mass 45 g occupies a volume of 50 cm³. Calculate its density.

    1. Option A: 1.11 g/cm³
    2. Option B: 9 g/cm³
    3. Option C: 0.45 g/cm³
    4. Option D: 0.9 g/cm³
    Show the answer to question 2

    Answer: D, 0.9 g/cm³

    Density = mass ÷ volume = 45 ÷ 50 = 0.9 g/cm³.

  3. Question 3

    Heat

    How much heat is needed to raise the temperature of 5 kg of aluminium by 30 °C? (Specific heat capacity of aluminium = 900 J/kg K.)

    1. Option A: 67,500 J
    2. Option B: 135,000 J
    3. Option C: 4,500 J
    4. Option D: 27,000 J
    Show the answer to question 3

    Answer: B, 135,000 J

    Q = mcΔθ = 5 × 900 × 30 = 135,000 J.

  4. Question 4

    Motion

    A car moving at 9 m/s accelerates uniformly at 2 m/s² for 5 s. Find its final velocity.

    1. Option A: 12 m/s
    2. Option B: 19 m/s
    3. Option C: 11 m/s
    4. Option D: 38 m/s
    Show the answer to question 4

    Answer: B, 19 m/s

    Use v = u + at = 9 + 2 × 5 = 19 m/s.

  5. Question 5

    Work and energy

    Calculate the kinetic energy of a 13 kg body moving at 10 m/s.

    1. Option A: 1300 J
    2. Option B: 650 J
    3. Option C: 65 J
    4. Option D: 130 J
    Show the answer to question 5

    Answer: B, 650 J

    KE = ½mv² = ½ × 13 × 10² = 650 J.

  6. Question 6

    Units and measurement

    What is the SI unit of electric current?

    1. Option A: Volt
    2. Option B: Coulomb
    3. Option C: Ampere
    4. Option D: Ohm
    Show the answer to question 6

    Answer: C, Ampere

    Current is measured in amperes (A).

  7. Question 7

    Waves

    A wave of frequency 400 Hz has a wavelength of 0.8 m. Find its speed.

    1. Option A: 500 m/s
    2. Option B: 0.002 m/s
    3. Option C: 320 m/s
    4. Option D: 640 m/s
    Show the answer to question 7

    Answer: C, 320 m/s

    v = fλ = 400 × 0.8 = 320 m/s.

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