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WAEC WASSCE 2015

WAEC Physics 2015 past questions

6 objective questions from the 2015 WAEC Physics paper. Answer each one, then reveal the answer and explanation.

All WAEC Physics past questions

  1. Question 1

    Motion

    A car moving at 5 m/s accelerates uniformly at 3 m/s² for 5 s. Find its final velocity.

    1. Option A: 18 m/s
    2. Option B: 20 m/s
    3. Option C: 8 m/s
    4. Option D: 40 m/s
    Show the answer to question 1

    Answer: B, 20 m/s

    Use v = u + at = 5 + 3 × 5 = 20 m/s.

  2. Question 2

    Density

    A sample of mass 1605 g occupies a volume of 75 cm³. Calculate its density.

    1. Option A: 0.05 g/cm³
    2. Option B: 214 g/cm³
    3. Option C: 10.7 g/cm³
    4. Option D: 21.4 g/cm³
    Show the answer to question 2

    Answer: D, 21.4 g/cm³

    Density = mass ÷ volume = 1605 ÷ 75 = 21.4 g/cm³.

  3. Question 3

    Units and measurement

    What is the SI unit of pressure?

    1. Option A: Pascal
    2. Option B: Newton
    3. Option C: Joule
    4. Option D: Watt
    Show the answer to question 3

    Answer: A, Pascal

    Pressure is measured in pascals (Pa), newtons per square metre.

  4. Question 4

    Waves

    A wave of frequency 650 Hz has a wavelength of 0.6 m. Find its speed.

    1. Option A: 1083.33 m/s
    2. Option B: 390 m/s
    3. Option C: 0.0009 m/s
    4. Option D: 780 m/s
    Show the answer to question 4

    Answer: B, 390 m/s

    v = fλ = 650 × 0.6 = 390 m/s.

  5. Question 5

    Current electricity

    A potential difference of 18.4 V is applied across a 23 Ω resistor. Find the current that flows.

    1. Option A: 0.8 A
    2. Option B: 423.2 A
    3. Option C: 1.25 A
    4. Option D: 1.6 A
    Show the answer to question 5

    Answer: A, 0.8 A

    By Ohm's law, I = V ÷ R = 18.4 ÷ 23 = 0.8 A.

  6. Question 6

    Pressure

    A force of 1100 N acts on an area of 1.5 m². Find the pressure exerted.

    1. Option A: 1,650 Pa
    2. Option B: 733.33 Pa
    3. Option C: 366.67 Pa
    4. Option D: 1,466.67 Pa
    Show the answer to question 6

    Answer: B, 733.33 Pa

    Pressure = force ÷ area = 1100 ÷ 1.5 = 733.33 Pa.

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