Waec Physics 2017 Past Questions and Answers

Question 26:

• WAEC 2017

A rainbow is formed when sunlight is incident on water droplets suspended in the air due to

A. Interference
B. Refraction
C. Dispersion
D. Diffraction

Question 27:

• WAEC 2017

Which of the following statements about the 3rd overtone of a vibrating air column of an open pipe is correct? It has

A. 4 nodes
B. 5 nodes
C. 3 antinodes
D. 4 antinodes

Question 28:

• WAEC 2017

Consider the wave equation: \(y = 10sin(x - 50t)\), What does the number 10 represent?

A. Acceleration
B. Speed
C. Amplitude
D. Wavelength

Question 29:

• WAEC 2017

Plane waves through a narrow gap emerge as circular waves. This phenomenon is known as

A. Interference
B. Dispersion
C. Refraction
D. Diffraction

Question 30:

• WAEC 2017

A ray of light incident at an angle \(\theta\) in a rectangular prism grazes the surface of the prism on emerging from the prism. Determine the value of the angle. [Absolute refractive index of the material of the prism is 1.5]

A. 41.8°
B. 48.2°
C. 60.8°
D. 90.0°