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WAEC WASSCE 2021

WAEC Physics 2021 past questions

6 objective questions from the 2021 WAEC Physics paper. Answer each one, then reveal the answer and explanation.

All WAEC Physics past questions

  1. Question 1

    Waves

    A wave has a frequency of 50 Hz and a wavelength of 4 m. Find its speed.

    1. Option A: 12.5 m/s
    2. Option B: 54 m/s
    3. Option C: 200 m/s
    4. Option D: 46 m/s
    Show the answer to question 1

    Answer: C, 200 m/s

    v = fλ = 50 × 4 = 200 m/s.

  2. Question 2

    Waves

    A wave of frequency 450 Hz has a wavelength of 1.2 m. Find its speed.

    1. Option A: 540 m/s
    2. Option B: 375 m/s
    3. Option C: 0.0027 m/s
    4. Option D: 1080 m/s
    Show the answer to question 2

    Answer: A, 540 m/s

    v = fλ = 450 × 1.2 = 540 m/s.

  3. Question 3

    Heat

    How much heat is needed to raise the temperature of 0.25 kg of iron by 35 °C? (Specific heat capacity of iron = 460 J/kg K.)

    1. Option A: 4,025 J
    2. Option B: 2,012.5 J
    3. Option C: 115 J
    4. Option D: 16,100 J
    Show the answer to question 3

    Answer: A, 4,025 J

    Q = mcΔθ = 0.25 × 460 × 35 = 4,025 J.

  4. Question 4

    Motion

    A car moving at 2 m/s accelerates uniformly at 3 m/s² for 6 s. Find its final velocity.

    1. Option A: 21 m/s
    2. Option B: 5 m/s
    3. Option C: 40 m/s
    4. Option D: 20 m/s
    Show the answer to question 4

    Answer: D, 20 m/s

    Use v = u + at = 2 + 3 × 6 = 20 m/s.

  5. Question 5

    Work and energy

    Calculate the kinetic energy of a 14 kg body moving at 4 m/s.

    1. Option A: 112 J
    2. Option B: 224 J
    3. Option C: 28 J
    4. Option D: 56 J
    Show the answer to question 5

    Answer: A, 112 J

    KE = ½mv² = ½ × 14 × 4² = 112 J.

  6. Question 6

    Density

    A sample of mass 137.5 g occupies a volume of 55 cm³. Calculate its density.

    1. Option A: 0.4 g/cm³
    2. Option B: 2.5 g/cm³
    3. Option C: 25 g/cm³
    4. Option D: 1.25 g/cm³
    Show the answer to question 6

    Answer: B, 2.5 g/cm³

    Density = mass ÷ volume = 137.5 ÷ 55 = 2.5 g/cm³.

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