Waec Physics Past Questions For Year 1993
Question 26
In a ripple tank experiment, a vibrating plate is used to generate ripples in the water. If the distance between two successive troughs is 3.5 cm and the wave travels a distance of 31.5 cm in 1.5 s, calculate the frequency of the vibrator
- A. 3.0Hz
- B. 6.0Hz
- C. 12.0Hz
- D. 27.0Hz
- E. 73.5Hz
Question 27
The unit of inductance is
- A. farad
- B. henry
- C. hertz
- D. weber
- E. tesla
Question 28
Which of the following instruments can be used to compare the relative magnitude of similar charges on two given bodies?
- A. Electrophorus
- B. Ebonite rod
- C. Proof plane
- D. Gold-leaf electroscope
- E. Capacitor
Question 29
Which of the following indicates the correct sequence of steps taken in charging a gold-leaf electroscope by induction? l. Removing the ebonite rod ll. Bringing a negatively charged ebonite rod close to the cap III. Earthing the cap IV. Disconnecting the earthing
- A. III, II, I and IV
- B. II, I, III and IV
- C. III, IV II and I
- D. II, III, IV and I
- E. III, IV, I and II.
Question 30
A short chain is usually attached to the back of a petrol tanker and trailing behind it so that the
- A. petrol tanker is balanced on the road
- B. heat generated by friction in the engine can be conducted to the earth
- C. charges generated by friction in the tanker are conducted to the earth
- D. tanker can move slowly as the chain touches the road surface
- E. chain can produce sound in resonance with the noise from the tanker‘s engine
