1991 - WAEC Physics Past Questions and Answers - page 4

Which of the following is not a mechanical wave?

Which of the following remains unchanged as light travels from one medium to the other? i. speed. ii. wavelength. iii. frequency.

Which of the following statements about wave is not correct? i. A wavefront is a line which contains all particles whose vibration are in phase. ii. The direction of propagation of a wave is the link drawn parallel to the wavefront. iii. A wavefront is a circle which is common to particles that are in the same state of disturbance

What type of motion does the skin of a talking drum perform when its being struck with the drum stick?

The sound from a bell in an enclosed jar gradually faints away while the jar is being evacuated. Which of the following explains this observation?

Which of the following statements is true of the diagram shown above?

A man standing 300m away from the wall sounds a whistle. The echo from the wall reaches him 1.8sec. later, calculate the velocity of sound in air

In which of the following is a stationary wave produced? i. A vibrating turning fork held near the end of a resonance tube closed at one end. ii. A string tightly stretched between two points and plucked at its middle. iii. The tuning fork vibrating in air

A particle of charge q and mass m moving with a velocity v enters a uniform magnetic field b in the direction of the field. The force on the particle is

If the frequency of the e.m.f. source in the a.c. circuit illustrated above is (\frac{500}{\pi})Hz. What is the reactance of the inductor?