Waec Physics 1993 Past Questions and Answers

Question 21:

• WAEC 1993

A lens of focal length 15.0 cm forms an upright image four times the size of an object. Calculate the distance of the image from the lens

A. 11.3cm
B. 18.8 cm
C. 37.5cm
D. 45.0cm
E. 75.0cm

Question 22:

• WAEC 1993

An object is placed between two mirrors which are inclined at an angle of 120° and facing each other. Determine the number of images observed in the two mirrors

A. 1
B. 2
C. 3
D. 4
E. 5

Question 23:

• WAEC 1993

In a ripple tank experiment, a vibrating plate is used to generate ripples in the water. If the distance between two successive troughs is 3.5 cm and the wave travels a distance of 31.5 cm in 1.5 s, calculate the frequency of the vibrator

A. 3.0Hz
B. 6.0Hz
C. 12.0Hz
D. 27.0Hz
E. 73.5Hz

Question 24:

• WAEC 1993

Which of the following have the longest wavelengths?

A. Infra-red rays
B. Gamma rays
C. X-rays
D. Ultra-violet rays
E. Radio waves

Question 25:

• WAEC 1993

A man stands in front of a tall wall and produces a sound. If he receives the echo of the sound two seconds later, calculate his distance from the wall. (The speed of sound in air is 330ms^-1)

A. 600m
B. 400m
C. 330m
D. 328m
E. 165m