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WAEC WASSCE Physics 2025 past questions and answers

This 2025 WAEC WASSCE Physics set has 40 practice questions. Try these 5 free sample questions, tap a question to reveal the answer and explanation. Then practise the whole 2025 set with instant marking.

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Sample WAEC WASSCE Physics 2025 questions

1. An ideal transformer has 1,200 turns in its primary coil and 100 turns in its secondary coil; if the primary voltage is 240 V, what is the secondary voltage?
  1. 20 V
  2. 24 V
  3. 48 V
  4. 12 V

Answer: A. 20 V

For an ideal transformer, Vs/Vp = Ns/Np, so Vs = 240 x 100/1200 = 20 V.

2. What is the period of an alternating current with a frequency of 50 Hz?
  1. 0.2 s
  2. 0.02 s
  3. 2 s
  4. 0.05 s

Answer: B. 0.02 s

The period T is the reciprocal of frequency, so T = 1/50 = 0.02 s.

3. A silicon diode is connected in forward bias to a suitable voltage source; which description best states its effect?
  1. It blocks current in both directions
  2. It converts direct current to alternating current
  3. It allows current to pass readily in the forward direction
  4. It stores charge like an insulator

Answer: C. It allows current to pass readily in the forward direction

A forward-biased diode conducts readily once its junction barrier is overcome.

4. A radioactive sample has a mass of 80 g and a half-life of 6 days; what mass remains after 18 days?
  1. 40 g
  2. 20 g
  3. 5 g
  4. 10 g

Answer: D. 10 g

Eighteen days is three half-lives, so the remaining mass is 80/2^3 = 10 g.

5. What is the charge of an alpha particle in terms of the elementary charge e?
  1. +2e
  2. +e
  3. -e
  4. -2e

Answer: A. +2e

An alpha particle contains two protons and two neutrons, giving it a charge of +2e.

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