Physics 1990 Waec Past Questions and Answers

Question 26 :

• WAEC 1990

Which of the following is/are characteristics of sound? I Pitch II. Loudness III. Quality IV Noise

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

Question 27 :

• WAEC 1990

The diagram above represents part of a wave motion in air. If the wave travels with a speed of 300ms^-1calculate the frequency of the wave.

A. 360Hz
B. 300Hz
C. 250Hz
D. 150Hz
E. 100Hz

Question 28 :

• WAEC 1990

Which of the following is/are necessary for the production of interference with two wave trains? I. The sources must be close to each other. II The waves must have the same frequency. III. The waves must have the same amplitude. IV. The waves must travel with the speed of light.

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

Question 29 :

• WAEC 1990

A stone is dropped into the middle of a pool of water. Which of the following statements is/are correct? I, Spherical waves are set up in the water. II. The water moves outwards to the sides of the pool. III. Energy is transmitted outwards from the centre of disturbance

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

Question 30 :

• WAEC 1990

A concave mirror of radius of curvature 20cm has a pin placed at 15cm from its pole. What will be the magnification of the image formed?

A. 4.00
B. 2.00
C. 1.33
D. 1.50
E. 0.25