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WAEC WASSCE Physics 2022 past questions and answers

This 2022 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 2022 set with instant marking.

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Sample WAEC WASSCE Physics 2022 questions

1. A fixed mass of gas occupies 240 cm^3 at 27 C. If its pressure remains constant, what volume will it occupy at 127 C?
  1. 320 cm^3
  2. 280 cm^3
  3. 400 cm^3
  4. 200 cm^3

Answer: A. 320 cm^3

At constant pressure, V/T is constant, so V2 = 240 x 400/300 = 320 cm^3 using kelvin temperatures.

2. How much energy is required to melt 0.50 kg of ice at 0 C? (Specific latent heat of fusion of ice = 3.4 x 10^5 J kg^-1.)
  1. 6.8 x 10^5 J
  2. 0.68 x 10^5 J
  3. 3.4 x 10^5 J
  4. 1.7 x 10^5 J

Answer: D. 1.7 x 10^5 J

The energy is mL = 0.50 x 3.4 x 10^5 = 1.7 x 10^5 J.

3. A metal spoon feels cooler than a wooden spoon left in the same room because the metal
  1. has a lower temperature than the wood
  2. contains less heat than the wood
  3. conducts heat away from the hand more rapidly
  4. reflects all the heat from the hand

Answer: C. conducts heat away from the hand more rapidly

Metal has a higher thermal conductivity and therefore removes heat from the hand faster.

4. A sound wave travels at 340 m s^-1 and has a frequency of 680 Hz. What is its wavelength?
  1. 0.25 m
  2. 2.0 m
  3. 1.0 m
  4. 0.50 m

Answer: D. 0.50 m

Wavelength = speed/frequency = 340/680 = 0.50 m.

5. A tuning fork of frequency 512 Hz produces resonance in an air column when the air-column length is 0.16 m, the column being closed at one end. What is the approximate speed of sound?
  1. 164 m s^-1
  2. 328 m s^-1
  3. 82 m s^-1
  4. 656 m s^-1

Answer: B. 328 m s^-1

At the first resonance in a closed pipe, L = wavelength/4, so speed = 4Lf = 4 x 0.16 x 512 = 328 m s^-1 approximately.

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