Waec Physics Past Questions For Year 1992
Question 31
How far from a cliff should a boy stand in order to hear the echo of his clap 0.9s later? (Speed of sound in air = 330 ms-1)
- A. 36.67m
- B. 74.25m
- C. 148.50m
- D. 297.00
- E. 366.67m
Question 32
Which of the following radiations have the highest frequency?
- A. Radio waves
- B. Light waves
- C. X-rays
- D. infra-red rays
- E. Ultraviolet rays
Question 33
The diagram above shows a waveform in which energy is transferred from A to B in a time of 2.5 x 10-3s. Calculate the frequency of the wave
- A. 2.0 x 103Hz
- B. 1.0 x 103Hz
- C. 4.0 x 10-2Hz
- D. 1.0 x 10-3Hz
- E. 5.0 x 104Hz.
Question 34
The change of the direction of a wavefront as a result of a change in the velocity of the wave in another medium is called
- A. refraction
- B. reflection
- C. diffraction
- D. polarization
Question 35
The angle of deviation of light of various colours passing through a glass prism decreases in the order of
- A. blue orange and red
- B. red, blue and orange
- C. blue, red and orange
- D. red, orange and blue
- E. orange, blue and red
