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Physics
WAEC / WASSCE 1992
Calorimetry, Latent Heat & Change of State
Which of the following instruments is used to measure relative humidity?
A
Hydrometer
B
Barometer
C
Manometer
D
Hypsometer
E
Hygrometer
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 #24261)
Physics
WAEC / WASSCE 1992
Calorimetry, Latent Heat & Change of State
Solution
A metal of mass 1.5 kg was heated from 27oC to 47oC in 4 minutes by a boiling ring of 75 W rating. Calculate the specific heat capacity of the metal, (Neglect heat losses to the surrounding)
A
2.5 X103J kg-10C-1
B
6.0 X102J kg-10C-1
C
2.5 x 102J kg-10C-1
D
1.4 X102J kg-10C-1
E
1.0 x 102J kg-10C-1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
I.Vt = mcθ; C = I.Vt/mθ = 75 x 4 x 60/1.5 x 20
= 6.0 X102J kg-10C-1
Source: Myschool Past Questions Archive (Record #24262)
Physics
WAEC / WASSCE 1992
Reflection, Refraction & Dispersion of Light
Solution
A ray of light strikes a plane mirror at an angle of incidence i. Determine in terms of i the angle of deviation of the ray after reflection from the mirror.
A
i
B
2i
C
90o-i
D
90o+ i
E
180o - 2i
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
the angle of deviation = 180 - the angle of incidence - the angle of reflection
but angle of incidence = angle of reflection(snell's law)
then angle of deviation = 180 - 2i
Source: Myschool Past Questions Archive (Record #24263)
Physics
WAEC / WASSCE 1992
Reflection, Refraction & Dispersion of Light
Images formed by a convex mirror are always
A
inverted, real and diminished
B
inverted, virtual and diminished
C
erect, virtual and diminished
D
erect, real and magnified
E
erect, virtual and magnified
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 #24264)
Physics
WAEC / WASSCE 1992
Reflection, Refraction & Dispersion of Light
Which of the following statements is not correct for a light ray passing through a rectangular glass block which is surrounded by air? It
A
suffers a displacement at the point of emergence
B
emerges parallel to the incident ray
C
is partly reflected at the point of incidence
D
is deviated at the point of emergence
E
is reflected in the block
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 #24265)
Physics
WAEC / WASSCE 1992
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following radiations have the highest frequency?
A
Radio waves
B
Light waves
C
X-rays
D
infra-red rays
E
Ultraviolet rays
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 #24276)
Physics
WAEC / WASSCE 1992
Waves, Sound & Vibrations
Solution
How far from a cliff should a boy stand in order to hear the echo of his clap 0.9s later? (Speed of sound in air = 330 ms-1)
A
36.67m
B
74.25m
C
148.50m
D
297.00
E
366.67m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
v = 2x/t ∴ distance x = vt/2 = 148.5m
Source: Myschool Past Questions Archive (Record #24277)
Physics
WAEC / WASSCE 1992
Waves, Sound & Vibrations
Which of the following waves are longitudinal waves? l. Ripples on the surface of water II. Waves produced by a tuning fork vibrating in air III. Light waves
IV. Waves produced by a flute
A
I and II only
B
I and III only
C
II and III only
D
II and IV only
E
III and IV 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 #24278)
Physics
WAEC / WASSCE 1992
Waves, Sound & Vibrations
Solution
Which of the following statements is not true?
A
Musical notes consist of the combination of sounds of regular frequency
B
The combination of overtones produced by an instrument determines the quality of the sound
C
the loudness of sound is determined by its frequency
D
the pitch of a note depends on the frequency of vibration of the source
E
Noise can be produced by a combination of sounds of irregular frequency
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
loudness depends on the intensity of sound while intensity in turn depends on the amplitude of vibration, the frequency of the solution, and the distance away from the sounding body.
Source: Myschool Past Questions Archive (Record #24279)
Physics
WAEC / WASSCE 1992
Current Electricity & Electric Circuits
Solution
A pipe closed at one end is 1.0m long. The air in the pipe is set into vibration and a fundamental note of frequency 85Hz is produced. Calculate the velocity of sound in the air. (Neglect end correction).
A
340.0ms-1
B
33Oms-1
C
170ms-1
D
85.0ms-1
E
42.5ms-1
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
L = λ/4; λ= 4 = 4m
v = fλ = 85 x 4 = 340ms-1
Source: Myschool Past Questions Archive (Record #24280)
Physics
WAEC / WASSCE 1992
Lenses & Optical Instruments
Solution
When an astronomical telescope is in normal adjustment, the focal length of the objective lens is 50cm and that of the eyepiece is 2.5om. What is the distance between the lenses?
A
20.0cm
B
47.5cm
C
50.0cm
D
52.5cm
E
125.0cm.
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Distance between lens = f0 + fe = 52.5cm
Source: Myschool Past Questions Archive (Record #24271)
Physics
WAEC / WASSCE 1992
Lenses & Optical Instruments
Which of the following is used for controlling the amount of light entering the eye?
A
Cornea
B
Pupil
C
Iris
D
Optic nerve
E
Ciliary muscle
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 #24272)
Physics
WAEC / WASSCE 1992
Current Electricity & Electric Circuits
Solution
The angle of deviation of light of various colours passing through a glass prism decreases in the order of
A
blue orange and red
B
red, blue and orange
C
blue, red and orange
D
red, orange and blue
E
orange, blue and red
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Upon passage through the prism, the white light is separated into its component colors - red, orange, yellow, green, blue and violet.
Source: Myschool Past Questions Archive (Record #24273)
Physics
WAEC / WASSCE 1992
Waves, Sound & Vibrations
The change of the direction of a wavefront as a result of a change in the velocity of the wave in another medium is called
A
refraction
B
reflection
C
diffraction
D
polarization
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 #24274)
Physics
WAEC / WASSCE 1992
Current Electricity & Electric Circuits
Diagram
Solution
The diagram above shows a waveform in which energy is transferred from A to B in a time of 2.5 x 10-3s. Calculate the frequency of the wave
Attached Figure / Diagram
A
2.0 x 103Hz
B
1.0 x 103Hz
C
4.0 x 10-2Hz
D
1.0 x 10-3Hz
E
5.0 x 104Hz.
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The waveform moved from A to B in \(2.5 \times 10^{-3}\) seconds.
From the diagram, A to B has \(2\frac{1}{2}\) complete oscillations between it, Therefore, the period of the oscillation is
\(\frac{2.5 \times 10^{-3}}{2.5} = 1 \times 10^{-3} s\)
\(Frequency = \frac{1}{Period}\)
= \(\frac{1}{1 \times 10^{-3}} = 1 \times 10^{3} Hz\)
Source: Myschool Past Questions Archive (Record #24275)