Waec Physics 1993 Past Questions and Answers

Question 26:

• WAEC 1993

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 27:

• WAEC 1993

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 28:

• WAEC 1993

Which of the following is a percussion instrument?

A. Flute
B. Organ
C. Bell
D. Piano
E. Sonometer

Question 29:

• WAEC 1993

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

Question 30:

• WAEC 1993

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.