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Physics WAEC / WASSCE 1990 Waves and Optics
A bat emits a sound wave at a speed of 1650.0ms-1 and receives the echoes 0.15s later. Calculate the distance of the bat from the reflector
A
8.75m
B
16.50m
C
87.75m
D
123.75m
E
330.00m
medium Difficulty
Physics WAEC / WASSCE 1990 Waves and Optics
A tuning fork sounds louder when its stem is pressed against a table top than when held in air because
A
a larger mass of air is set vibrating by the table top
B
the whole table vibrates in resonance
C
the whole table has acquired a larger frequency
D
the fork and table have the same frequency
E
the amplitude of the vibrating fork is increased.
medium Difficulty
Physics WAEC / WASSCE 1990 Waves and Optics
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
medium Difficulty
Physics WAEC / WASSCE 1990 Waves and Optics
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.
Attached Figure / Diagram
Question diagram
A
360Hz
B
300Hz
C
250Hz
D
150Hz
E
100Hz
medium Difficulty
Physics WAEC / WASSCE 1990 Waves and Optics
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
medium Difficulty
Physics WAEC / WASSCE 1990 Waves and Optics
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
medium Difficulty
Physics WAEC / WASSCE 1990 Waves and Optics
Where will the image of the object OB shown in the diagram above be located after reflection from the mirror?
Attached Figure / Diagram
Question diagram
A
At F
B
Beyond C
C
Between O and P
D
Between P and F
E
Between F and C
medium Difficulty
Physics WAEC / WASSCE 1990 Waves and Optics
A parallel beam of light is to be obtained from the headlamp ofa car. At which of the following positions should the source of light be placed from the pole of its spherical minor?
A
At the focal point
B
At the centre of curvature
C
Beyond the centre of curvature
D
Between the focal point and the pole
E
Between the focal point and the center of curvature
medium Difficulty
Physics WAEC / WASSCE 1990 Waves and Optics
A simple microscope forms an image twice the size of the object. If the focal length of the lens of the microscope is 20m, how far is the object from the lens?
A
10m
B
20m
C
30m
D
40m
E
60m
medium Difficulty
Physics WAEC / WASSCE 1990 Waves and Optics
Which of the following pairs of light rays shows the widest separation in the spectrum of white light?
A
Yellow and red
B
Orange and green
C
Violet and blue
D
Blue and green
E
Red and indigo
medium Difficulty
Physics WAEC / WASSCE 1990 Waves and Optics
A rectangular coil of wire can rotate in a magnetic field. The ends of the coil are soldered to the two halves of a split ring. Two carbon brushes are made to press lightly against the split ring and when these are connected in circuit with a battery and rheostat, the coil rotates. This is a description of
A
a suspended- coil vanometer
B
a moving-cell ammeter
C
a d.c generator
D
an electric motor
E
an induction coil,
medium Difficulty
Physics UTME / JAMB 1990 Waves and Optics
An object which is 3cm high is placed vertically 10cm in front of a concave mirror. If this object produces an image 40cm from the mirror, the height of the image is
A
0.75cm
B
4.00cm
C
8.00cm
D
12.00cm
medium Difficulty
Physics UTME / JAMB 1990 Waves and Optics
What must be the distance between an object and a converging lens of focal length 20cm to produce an erect image two times the object height?
A
20cm
B
15cm
C
10cm
D
5cm
medium Difficulty
Physics UTME / JAMB 1990 Waves and Optics
For a short sighted person, light rays from a point on a very distant object is focused
A
in front of the retina
B
on the retina by a converging lens
C
behind the retina by a diverging lens
D
in front of the retina, a distance 2F from the lens
medium Difficulty
Physics UTME / JAMB 1990 Waves and Optics
When light is incident on an object which is magenta in colour, which of the following colour would be absorbed?
A
Red and blue
B
Green only
C
Red and green
D
Red only
medium Difficulty
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