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Physics
WAEC / WASSCE 1990
Current Electricity & Electric Circuits
Solution
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
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Distance x = vt/2 = 1650 x 0.15/2 = 123.75m
Source: Myschool Past Questions Archive (Record #24102)
Physics
WAEC / WASSCE 1990
Waves, Sound & Vibrations
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
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #24103)
Physics
WAEC / WASSCE 1990
Current Electricity & Electric Circuits
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
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #24104)
Physics
WAEC / WASSCE 1990
Current Electricity & Electric Circuits
Diagram
Solution
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
A
360Hz
B
300Hz
C
250Hz
D
150Hz
E
100Hz
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
21/2λ = 3m; λ = 1.2m v= 300
f = v/x = 300/1.2 = 250Hz
Source: Myschool Past Questions Archive (Record #24105)
Physics
WAEC / WASSCE 1990
Waves, Sound & Vibrations
Solution
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
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Constructive and destructive interference result from the interaction of waves that are correlated or coherent with each other, either because they come from the same source or because they have the same or nearly the same frequency.
Source: Myschool Past Questions Archive (Record #24106)
Physics
WAEC / WASSCE 1990
Current Electricity & Electric Circuits
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.
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #24107)
Physics
WAEC / WASSCE 1990
Reflection, Refraction & Dispersion of Light
Solution
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
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
1/U + 1/V = 1/f
f = r/2 = 10cm; 1/15 + 1/v = 1/10
v = 30 = m = v/u = 2
Source: Myschool Past Questions Archive (Record #24108)
Physics
WAEC / WASSCE 1990
Current Electricity & Electric Circuits
Diagram
Solution
Where will the image of the object OB shown in the diagram above be located after reflection from the mirror?
Attached Figure / Diagram
A
At F
B
Beyond C
C
Between O and P
D
Between P and F
E
Between F and C
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
The image of an object after reflection from a mirror is located at the same distance behind the mirror as the object in front. In this case, the object is located between the mirror and the focal point. Therefore, the image will be located between p and F.
Source: Myschool Past Questions Archive (Record #24109)
Physics
WAEC / WASSCE 1990
Current Electricity & Electric Circuits
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
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #24110)
Physics
WAEC / WASSCE 1990
Reflection, Refraction & Dispersion of Light
Diagram
The diagram above shows an incident ray A, inclined at angle of 50o to the interface CB. The ray OB is found to lie along the surface. What is the refractive index of the medium X with respect to air?
Attached Figure / Diagram
A
sin50o/sin40o
B
sin40osin50o
C
sin90o/sin50o
D
sin40o/sin90o
E
sin90o/sin40o
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #24111)
Physics
WAEC / WASSCE 1990
Reflection, Refraction & Dispersion of Light
Diagram
Solution
The diagram above shows an incident ray A, inclined at angle of 50º to the interface CB. The ray OB is found to lie along the surface. What is the refractive index of the medium X with respect to air?
Attached Figure / Diagram
A
sin50o/sin40o
B
sin40osin50o
C
sin90o/sin50o
D
sin40o/sin90o
E
sin90o/sin40o
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
angle of incidence = 90º - 50º = 40º
the angle the refracted ray makes with the normal is 90º
but refractive index(n) = \(\frac{i}{r} = \frac{40}{90}\).
Source: Myschool Past Questions Archive (Record #24112)
Physics
WAEC / WASSCE 1990
Lenses & Optical Instruments
Diagram
The eye defect illustrated by the diagram above is
Attached Figure / Diagram
A
astigmatism
B
long sightedness
C
loss accommodation
D
short sightedness
E
colour blindness
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #24113)
Physics
WAEC / WASSCE 1990
Lenses & Optical Instruments
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
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #24115)
Physics
WAEC / WASSCE 1990
Reflection, Refraction & Dispersion of Light
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
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #24116)
Physics
WAEC / WASSCE 1990
Current Electricity & Electric Circuits
Solution
Given that the gravitational constant is 7 X 10-11 Nm2kg-2, what is the force of attraction between 106kg mass of lead hanging one metre away from a 103kg mass of iron?
A
7 x10-20N
B
7 x 10-5N
C
7x10-2N
D
7x103N
E
7x100N
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
F = Gm1m2/r2 = 7 x 10-11 x 106 x 103/1m = 7 x 10-2
Source: Myschool Past Questions Archive (Record #24117)