1989 - WAEC Physics Past Questions and Answers - page 3

21
A ray of light is incidence on a plane mirror at an angle of 35o. What is the angle by the reflected ray with the surface of the mirror?
A
125o
B
70o
C
65o
D
55o
22
The image in a pine-hole camera is always
A
diminished
B
enlarged
C
upright
D
inverted
23
The refractive index of a given transparent medium is 1.4. Which of the following is the minimum internal angle for total internal reflection to take place in the medium?
A
30o
B
36o
C
44o
D
46o
24
The distance between a node and an anti-node for a transverse wave is equal to
A
the wavelength
B
thrice the wavelength
C
one-half of the wavelength
D
one-quater of the wavelength
25
Which of the following is a stringed instrument?
A
flute
B
trumpet
C
piano
D
drum
26
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
27
In a wave the maximum displacement of particles from their equilibrium positions is called.
A
frequency
B
amplitude
C
period
D
wavelength
28
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
29
Which of the following is not a property of longitudinal waves?
A
compression
B
reflection
C
refraction
D
polarization
30
What is the gravitational potential due to a molecule of mass, m and at a distance, r from it? (G = gravitational constant).
A
Gm2/r2
B
Gm/r
C
Gm2/r
D
G2m2/r
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