Waec Physics 1996 Past Questions and Answers

Question 36:

• WAEC 1996

The walls and ceilings of many standard auditoria are covered with perforated pads to

A. Increase the intensity of sound waves
B. Increase the loudness of sound waves
C. Reduce the effect of reverberations of sound waves
D. Increase the interference effect of sound waves
E. Decrease the frequency of sound waves.

Question 37:

• WAEC 1996

A string of length 1.0 m vibrates in 10 loops. If the total mass of the string is 1.0 x 10^-3 kg and the tension in it is 10N, calculate the frequency of the vibration.

A. 50Hz
B. 100Hz
C. 250Hz
D. 400Hz
E. 500Hz

Question 38:

• WAEC 1996

The distance between two successive crests of a water is 1m. lf a particle on the surface of the water makes two complete vertical oscillations in 1 second, calculate the speed of the wave

A. 0.5 ms^-1
B. 1.0 ms^-1
C. 2.0ms^-1
D. 3.0ms^-1
E. 4.0ms^-1

Question 39:

• WAEC 1996

A sound wave of velocity 350 ms^-1 is directed towards the surface of water. lf the ratio of the wavelength of sound in water to that in air is 425:100, calculate the velocity on the wave in water

A. 82.4ms^-1
B. 148.8ms^-1
C. 350.0ms^-1
D. 1487.5ms^-1
E. 3500.5ms^-1.

Question 40:

• WAEC 1996

The speed of sound in air is 330ms^-1. How far from the centre of a storm is an observer who hears a thunder clap 2s after the lightning flash? (Neglect the time taken by light to travel to the observer)

A. 1320m
B. 660m
C. 600m
D. 330m
E. 165m