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WAEC WASSCE Physics 2020 past questions and answers

This 2020 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 2020 set with instant marking.

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Sample WAEC WASSCE Physics 2020 questions

1. A 0.50 kg metal block of specific heat capacity 400 J kg^-1 K^-1 is heated by 20 K. How much heat is supplied?
  1. 400 J
  2. 8 000 J
  3. 4 000 J
  4. 2 000 J

Answer: C. 4 000 J

Using Q = mcΔT gives Q = 0.50 x 400 x 20 = 4 000 J.

2. How much heat is required to melt 0.20 kg of ice at 0°C if the specific latent heat of fusion of ice is 3.3 x 10^5 J kg^-1?
  1. 6.6 x 10^4 J
  2. 1.65 x 10^6 J
  3. 3.3 x 10^5 J
  4. 6.6 x 10^5 J

Answer: A. 6.6 x 10^4 J

The heat required is mL = 0.20 x 3.3 x 10^5 = 6.6 x 10^4 J.

3. What is the temperature of the melting point of ice on the Fahrenheit scale?
  1. 0°F
  2. 100°F
  3. 180°F
  4. 32°F

Answer: D. 32°F

The melting point of ice is 32°F on the Fahrenheit scale.

4. A gas at constant volume has a pressure of 100 kPa at 300 K. What is its pressure at 450 K?
  1. 125 kPa
  2. 150 kPa
  3. 200 kPa
  4. 250 kPa

Answer: B. 150 kPa

At constant volume, P/T is constant, so P2 = 100 x 450/300 = 150 kPa.

5. Which pair of features is characteristic of a longitudinal wave?
  1. Crests and troughs
  2. Compressions and rarefactions
  3. Nodes and antinodes only
  4. Polarized vibrations

Answer: B. Compressions and rarefactions

Longitudinal waves consist of compressions and rarefactions in the direction of propagation.

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