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Physics
WAEC / WASSCE 1993
Current Electricity & Electric Circuits
An image which cannot be formed on a screen is said to be
A
inverted
B
real
C
virtual
D
erect
E
blurred
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 #25009)
Physics
WAEC / WASSCE 1993
Lenses & Optical Instruments
The images formed by a diverging lens are always
A
diminished, virtual and inverted
B
diminished inverted and real
C
diminished, virtual and erect
D
magnified, virtual and erect
E
magnified, real and inverted.
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 #25010)
Physics
WAEC / WASSCE 1993
Lenses & Optical Instruments
In the normal use of a simple microscope, a person sees an
A
inverted, virtual and magnified image
B
erect, virtual and magnified image
C
erect, real and magnified image
D
inverted, real and magnified image
E
inverted and real image the same size as the object.
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 #25011)
Physics
WAEC / WASSCE 1993
Lenses & Optical Instruments
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
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 #25012)
Physics
WAEC / WASSCE 1993
Current Electricity & Electric Circuits
Solution
An object is placed between two mirrors which are inclined at an angle of 120^\circ and facing each other. Determine the number of images observed in the two mirrors
A
1
B
2
C
3
D
4
E
5
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Number of images = (360 / 120) - 1
= 3 - 1 = 2
number of images formed = 2
Source: Myschool Past Questions Archive (Record #25013)
Physics
WAEC / WASSCE 1993
Waves, Sound & Vibrations
Solution
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
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
λ = 3.5cm V =D/T = 31.5/1.5 = 21; f = V/ λ = 6.0
Source: Myschool Past Questions Archive (Record #25014)
Physics
WAEC / WASSCE 1993
Atomic, Quantum, Nuclear Physics & Electronics
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
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 #25015)
Physics
WAEC / WASSCE 1993
Waves, Sound & Vibrations
Solution
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
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
x = vt/2 = \(\frac {330 \times 2} {2}\) = 660/2 = 330m
Source: Myschool Past Questions Archive (Record #25016)
Physics
WAEC / WASSCE 1993
Waves, Sound & Vibrations
Which of the following is correct about light and sound waves?
A
Both of them are associated with energy transfer
B
Both of them need material media for propagation
C
they are both longitudinal waves
D
their velocities in air are equal
E
Both of them can be polarized
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 #25017)
Physics
WAEC / WASSCE 1993
Waves, Sound & Vibrations
The quality of a note produced by a vibrating string is determined by the
A
pitch of the note
B
tension of the string
C
material of the string
D
presence of overtones
E
thickness of the string
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 #25018)
Physics
WAEC / WASSCE 1993
Waves, Sound & Vibrations
Which of the following is a percussion instrument?
A
Flute
B
Organ
C
Bell
D
Piano
E
Sonometer
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 #25019)
Physics
WAEC / WASSCE 1993
Current Electricity & Electric Circuits
Solution
A short chain is usually attached to the back of a petrol tanker and trailing behind it so that the
A
petrol tanker is balanced on the road
B
heat generated by friction in the engine can be conducted to the earth
C
charges generated by friction in the tanker are conducted to the earth
D
tanker can move slowly as the chain touches the road surface
E
chain can produce sound in resonance with the noise from the tanker‘s engine
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Big vehicles gets charged because of friction between them and the air rushing past them.This is the reason tankers often have a metal chain dragging along the ground so that charge produced leaks to the ground through chain.
Source: Myschool Past Questions Archive (Record #25020)
Physics
WAEC / WASSCE 1993
Electrostatics & Capacitors
Solution
Which of the following indicates the correct sequence of steps taken in charging a gold-leaf electroscope by induction? l. Removing the ebonite rod ll. Bringing a negatively charged ebonite rod close to the cap III. Earthing the cap IV. Disconnecting the earthing
A
III, II, I and IV
B
II, I, III and IV
C
III, IV II and I
D
II, III, IV and I
E
III, IV, I and II.
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Bringing a negatively charged ebonite rod close to the cap (II): This causes the electrons in the electroscope to be repelled, leaving the top of the electroscope positively charged. Earthing the cap (III): This allows electrons from the ground to flow into the electroscope, neutralizing the positive charge.
Disconnecting the earthing (IV): This isolates the electroscope while it retains the induced charge.
Removing the ebonite rod (I): This stops the influence of the charged rod. Therefore, the correct sequence is: II → III → IV → I.
Source: Myschool Past Questions Archive (Record #25021)
Physics
WAEC / WASSCE 1993
Electrostatics & Capacitors
Which of the following instruments can be used to compare the relative magnitude of similar charges on two given bodies?
A
Electrophorus
B
Ebonite rod
C
Proof plane
D
Gold-leaf electroscope
E
Capacitor
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 #25022)
Physics
WAEC / WASSCE 1993
Magnetism, Electromagnetism & AC Circuits
The unit of inductance is
A
farad
B
henry
C
hertz
D
weber
E
tesla
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 #25023)