Waec Physics Past Questions and Answers

Question 46:

• WAEC 1988

A source of sounds produces waves in air of wavelength1.65m. If the speed of sound in air is 330ms-1 the period of vibration in seconds is

A. 200
B. 2.0
C. 0.5
D. 0.02
E. 0.005

Question 47:

• WAEC 1988

Which of the following statement s is/are not correct about a standing wave? I. It is formed by the superimposition of two progressive waves traveling in the same direction II. All points on the wave are vibrating with maximum displacement III. It is formed by the superimposition of two progressive waves of different amplitudes traveling in opposite directions

A. I only
B. II only
C. I and II only
D. II and III only
E. I,II and III

Question 48:

• WAEC 1988

A boy standing a distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms1, how far is he from the cliff?

A. 17m
B. 34m
C. 85m
D. 170m
E. 680m

Question 49:

• WAEC 1988

A sounding tuning fork is brought near the end of a pipe containing an air column and the loudness of the sound increases. This effect is due to

A. Diffraction
B. An echo
C. Resonance
D. Interference
E. Reverberation

Question 50:

• WAEC 1988

If the leaves a positively charged electroscope collapse completely as an object is brought near the cap of the electroscope, the objects possesses

A. An equal amount of positive charge
B. Less amount of negative charge
C. No charge
D. A positive charge
E. An equal amount of negative charge