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WAEC WASSCE Physics 2023 past questions and answers

This 2023 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 2023 set with instant marking.

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Sample WAEC WASSCE Physics 2023 questions

1. Two point charges of 2.0 µC and 3.0 µC are separated by 0.30 m in air. Taking the electrostatic constant as 9.0 × 10^9 N m^2 C^-2, what is the magnitude of the force between them?
  1. 0.60 N
  2. 0.18 N
  3. 6.0 N
  4. 1.8 N

Answer: A. 0.60 N

Coulomb's law gives F = kq1q2/r^2 = (9.0 × 10^9)(6.0 × 10^-12)/(0.30)^2 = 0.60 N.

2. Capacitors of capacitance 6 µF and 3 µF are connected in series. What is their equivalent capacitance?
  1. 9 µF
  2. 2 µF
  3. 4.5 µF
  4. 18 µF

Answer: B. 2 µF

For series capacitors, 1/C = 1/6 + 1/3, so the equivalent capacitance is 2 µF.

3. Resistors of 4 Ω and 8 Ω are connected in parallel across a 12 V supply. What is the total current supplied?
  1. 1.5 A
  2. 3.0 A
  3. 4.5 A
  4. 6.0 A

Answer: C. 4.5 A

The parallel resistance is (4 × 8)/(4 + 8) = 8/3 Ω, so the supply current is 12 ÷ (8/3) = 4.5 A.

4. A 1.5 kW heater operates for 2.0 h. How much electrical energy does it use?
  1. 0.75 kWh
  2. 1.5 kWh
  3. 2.0 kWh
  4. 3.0 kWh

Answer: D. 3.0 kWh

Electrical energy used is power multiplied by time, giving 1.5 × 2.0 = 3.0 kWh.

5. A cell of e.m.f. 12 V and internal resistance 1 Ω is connected to a 5 Ω resistor. What current flows in the circuit?
  1. 2.0 A
  2. 2.4 A
  3. 3.0 A
  4. 12 A

Answer: A. 2.0 A

The total resistance is 5 + 1 = 6 Ω, so the current is 12/6 = 2.0 A.

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