Waec Physics 1989 Past Questions and Answers

Question 26:

• WAEC 1989

Which of the following is a stringed instrument?

A. Flute
B. Trumpet
C. Piano
D. Drum
E. Saxophone

Question 27:

• WAEC 1989

A sound pulse sent vertically downwards into the earth is reflected from two different layers of the earth such that echoes are heard 1.2s and 1.4s. Assuming speed of the pulse is 2000ms^-1, calculate the distance between the layers.

A. 200 m
B. 400 m
C. 2400 m
D. 2600 m
E. 2800 m

Question 28:

• WAEC 1989

In a wave the maximum displacement of particles from their equilibrium positions is called.

A. Frequency
B. Amplitude
C. Period
D. Wavelength
E. Wave velocity

Question 29:

• WAEC 1989

A string is stretched between two points 50cm apart. It is then plucked at its center and the velocity of the wave produced is 300m/s. Calculate the number of vibrations made by the string in 1s.

A. 3
B. 6
C. 150
D. 300
E. 600

Question 30:

• WAEC 1989

Which of the following is not a property of longitudinal waves?

A. Compression
B. Reflection
C. Refraction
D. Polarization
E. Diffraction