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WAEC WASSCE 2019

WAEC Physics 2019 past questions

7 objective questions from the 2019 WAEC Physics paper. Answer each one, then reveal the answer and explanation.

All WAEC Physics past questions

  1. Question 1

    Motion

    A car accelerates uniformly from rest to 20 m/s in 5 s. Calculate its acceleration.

    1. Option A: 2 m/s²
    2. Option B: 4 m/s²
    3. Option C: 25 m/s²
    4. Option D: 100 m/s²
    Show the answer to question 1

    Answer: B, 4 m/s²

    a = (v − u) ÷ t = (20 − 0) ÷ 5 = 4 m/s².

  2. Question 2

    Work and energy

    Calculate the kinetic energy of a 12 kg body moving at 8 m/s.

    1. Option A: 384 J
    2. Option B: 768 J
    3. Option C: 48 J
    4. Option D: 96 J
    Show the answer to question 2

    Answer: A, 384 J

    KE = ½mv² = ½ × 12 × 8² = 384 J.

  3. Question 3

    Motion

    A car starts from rest and accelerates uniformly at 4 m/s² for 4 s. What is its final velocity?

    1. Option A: 20 m/s
    2. Option B: 4 m/s
    3. Option C: 16 m/s
    4. Option D: 32 m/s
    Show the answer to question 3

    Answer: C, 16 m/s

    Use v = u + at = 0 + 4 × 4 = 16 m/s.

  4. Question 4

    Pressure

    A force of 1500 N acts on an area of 16 m². Find the pressure exerted.

    1. Option A: 93.75 Pa
    2. Option B: 24,000 Pa
    3. Option C: 46.88 Pa
    4. Option D: 187.5 Pa
    Show the answer to question 4

    Answer: A, 93.75 Pa

    Pressure = force ÷ area = 1500 ÷ 16 = 93.75 Pa.

  5. Question 5

    Heat

    How much heat is needed to raise the temperature of 1.2 kg of copper by 25 °C? (Specific heat capacity of copper = 400 J/kg K.)

    1. Option A: 6,000 J
    2. Option B: 12,000 J
    3. Option C: 480 J
    4. Option D: 10,000 J
    Show the answer to question 5

    Answer: B, 12,000 J

    Q = mcΔθ = 1.2 × 400 × 25 = 12,000 J.

  6. Question 6

    Units and measurement

    Which of the following is a scalar quantity?

    1. Option A: Force
    2. Option B: Displacement
    3. Option C: Acceleration
    4. Option D: Mass
    Show the answer to question 6

    Answer: D, Mass

    Mass has magnitude only.

  7. Question 7

    Density

    A sample of mass 868.5 g occupies a volume of 45 cm³. Calculate its density.

    1. Option A: 19.3 g/cm³
    2. Option B: 0.05 g/cm³
    3. Option C: 193 g/cm³
    4. Option D: 9.65 g/cm³
    Show the answer to question 7

    Answer: A, 19.3 g/cm³

    Density = mass ÷ volume = 868.5 ÷ 45 = 19.3 g/cm³.

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