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WAEC WASSCE Physics 2008 past questions and answers

This 2008 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 2008 set with instant marking.

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Sample WAEC WASSCE Physics 2008 questions

1. A wave has frequency 250 Hz and wavelength 1.2 m. What is its speed?
  1. 300 m/s
  2. 208 m/s
  3. 250 m/s
  4. 1.2 m/s

Answer: A. 300 m/s

Wave speed is fλ = 250 × 1.2 = 300 m/s.

2. A sound pulse returns as an echo 0.50 s after it is sent toward a cliff; if sound travels at 340 m/s, how far away is the cliff?
  1. 170 m
  2. 85 m
  3. 340 m
  4. 680 m

Answer: B. 85 m

The sound travels to the cliff and back, so the distance is 340 × 0.50 ÷ 2 = 85 m.

3. In a longitudinal wave travelling through air, how do the air particles vibrate relative to the direction of travel?
  1. In circles around the direction of travel
  2. At right angles to the direction of travel
  3. Parallel to the direction of travel
  4. They do not vibrate

Answer: C. Parallel to the direction of travel

Particles in a longitudinal wave oscillate parallel to the direction in which the wave travels.

4. A light ray passes obliquely from air into glass; which change in its direction is expected?
  1. It bends away from the normal
  2. It continues undeviated in every case
  3. It is reflected entirely at the boundary
  4. It bends towards the normal

Answer: D. It bends towards the normal

Light entering the optically denser glass from air slows down and bends towards the normal.

5. A converging lens has a focal length of 0.20 m; what is its power?
  1. +5.0 D
  2. +0.20 D
  3. −5.0 D
  4. −0.20 D

Answer: A. +5.0 D

Lens power P = 1/f = 1/0.20 = +5.0 dioptres for a converging lens.

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