Waec Physics Past Questions For Year 1990
Question 21
Two solids P and Q of equal mass are heated to the same temperature and dropped simultaneously into two identical containers X and Y containing equal volumes of water at room temperature. The temperature of X will rise higher than that of Y only if the
- A. volume of P is greater than that of Q
- B. specific heat capacity of P is higher than that of Q
- C. density of P is greater than that of Q
- D. density of P is lower than that of Q
- E. specitic heat capacity of P is lower than that of Q.
Question 22
The diagram above represents part of a wave motion in air. If the wave travels with a speed of 300ms-1calculate the frequency of the wave.
- A. 360Hz
- B. 300Hz
- C. 250Hz
- D. 150Hz
- E. 100Hz
Question 23
Which of the following is/are characteristics of sound? I Pitch II. Loudness III. Quality IV Noise
- A. I only
- B. II only
- C. I and II only
- D. l, II and III only
- E. I, II, III and IV
Question 24
A tuning fork sounds louder when its stem is pressed against a table top than when held in air because
- A. a larger mass of air is set vibrating by the table top
- B. the whole table vibrates in resonance
- C. the whole table has acquired a larger frequency
- D. the fork and table have the same frequency
- E. the amplitude of the vibrating fork is increased.
Question 25
A bat emits a sound wave at a speed of 1650.0ms-1 and receives the echoes 0.15s later. Calculate the distance of the bat from the reflector
- A. 8.75m
- B. 16.50m
- C. 87.75m
- D. 123.75m
- E. 330.00m
