Waec Physics Past Questions For Year 1993
Question 21
An image which cannot be formed on a screen is said to be
- A. inverted
- B. real
- C. virtual
- D. erect
- E. blurred
Question 22
The quality of a note produced by a vibrating string is determined by the
- A. pitch of the note
- B. tension of the string
- C. material of the string
- D. presence of overtones
- E. thickness of the string
Question 23
Which of the following is correct about light and sound waves?
- A. Both of them are associated with energy transfer
- B. Both of them need material media for propagation
- C. they are both longitudinal waves
- D. their velocities in air are equal
- E. Both of them can be polarized
Question 24
A man stands in front of a tall wall and produces a sound. If he receives the echo of the sound two seconds later, calculate his distance from the wall. (The speed of sound in air is 330ms-1)
- A. 600m
- B. 400m
- C. 330m
- D. 328m
- E. 165m
Question 25
Which of the following have the longest wavelengths?
- A. Infra-red rays
- B. Gamma rays
- C. X-rays
- D. Ultra-violet rays
- E. Radio waves
