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Physics
WAEC / WASSCE 1996
Waves, Sound & Vibrations
A sound wave of velocity 350 ms-1 is directed towards the surface of water. lf the ratio of the wavelength of sound in water to that in air is 425:100, calculate the velocity on the wave in water
A
82.4ms-1
B
148.8ms-1
C
350.0ms-1
D
1487.5ms-1
E
3500.5ms-1.
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 #25235)
Physics
WAEC / WASSCE 1996
Current Electricity & Electric Circuits
Solution
The speed of sound in air is 330ms-1. How far from the centre of a storm is an observer who hears a thunder clap 2s after the lightning flash? (Neglect the time taken by light to travel to the observer)
A
1320m
B
165m
C
600m
D
330m
E
343m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
To determine the distance from the center of the storm to the observer, we use the speed of sound and the time it takes for the sound to reach the observer.
Given: Speed of sound in air: \( v = 330 \, \text{ms}^{-1} \), Time delay: \( t = 2 \, \text{s} \)
The distance \( d \) can be calculated using the formula:
\(d = v \times t\)
Substituting the values:
\(d = 330 \, \text{ms}^{-1} \times 2 \, \text{s} = 660 \, \text{m}\)
Therefore, the distance from the center of the storm is 660 m.
Source: Myschool Past Questions Archive (Record #25236)
Physics
WAEC / WASSCE 1996
Current Electricity & Electric Circuits
Diagram
Solution
The diagram above illustrates a variation of the displacement y of a wave particle with time t. lf the velocity of wave is 250ms-1, calculate the distance between two successive particles which are in phase
Attached Figure / Diagram
A
20m
B
2.5m
C
3.0m
D
5.0m
E
50.0m
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Time to complete one circle = 0.02secs
But, v = f\(\lambda\)
f = \(\frac{1}{f}\) = \(\frac{1}{0.02}\) = 50Hz
\(\lambda\) = \(\frac{250}{50}\) = 5m.
Source: Myschool Past Questions Archive (Record #25237)
Physics
WAEC / WASSCE 1996
Waves, Sound & Vibrations
Diagram
The diagram above represents a stationary wave set up in a string which is fixed at both ends. lf the frequency of the wave is 256Hz and the distance N1 N2 equals 1.5m, calculate the speed of the wave.
Attached Figure / Diagram
A
128ms-1
B
192ms-1
C
384ms-1
D
768ms-1
E
1536ms-1
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 #25238)
Physics
WAEC / WASSCE 1996
Current Electricity & Electric Circuits
CalcuIate the power delivered by a 3-phase line if its voltage and current at 132KV and 60A respectively.
A
2.38 x 107W
B
7.92 x 106W
C
3.96 x 106W
D
2.64 x 106W
E
7.92 x 104W
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 #25239)
Physics
WAEC / WASSCE 1996
Current Electricity & Electric Circuits
Solution
Which of the following is used in a nuclear reactor to slow down fast-moving neutrons?
A
Carbondioxide gas
B
Liquid sodium metal
C
Concrete shield
D
Graphite rods
E
Boron rods
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Graphite is commonly used as a moderator in nuclear reactors to slow down fast-moving neutrons, making them more likely to induce further fission reactions.
Source: Myschool Past Questions Archive (Record #25255)
Physics
WAEC / WASSCE 1996
Atomic, Quantum, Nuclear Physics & Electronics
Solution
Which of the following particles/rays do not originate from the nucleus of an atom?
A
Alpha particles
B
Beta particles
C
Neutrons
D
Gamma rays
E
X-rays
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
All of the options above are emitted by the nucleus except X-rays that are emitted by electrons.
Source: Myschool Past Questions Archive (Record #25257)
Physics
WAEC / WASSCE 1996
Atomic, Quantum, Nuclear Physics & Electronics
Solution
The count rate of an alpha-particle source is 400 per minute. If the half-life of the source is 5 days, what would be the count rate per minute after 15 days?
A
20
B
25
C
50
D
200
E
400
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Initial count rate N\(_o\) = 400 per minute, Half-life\(T_{\frac{1}{2}}\) = 5 days, T = 15days, N (count after 15 days) = ?
Using: N = N\(_o\)(\(\frac{1}{2}\))\(^{\frac{T}{T_{\frac{1}{2}}}}\)
N = 400 x (\(\frac{1}{2}\))\(^{\frac{15}{5}}\)
N = 400 x \(\frac{1}{2}\)\(^3\) = 400 x \(\frac{1}{8}\) = \(\frac{400}{8}\) = 50.
Source: Myschool Past Questions Archive (Record #25258)
Physics
WAEC / WASSCE 1996
Current Electricity & Electric Circuits
A cell of e.m.f. 1.5V is connected in series with a resistor of resistance 39. A high-resistance voltmeter connected across the cell registers only 0.9V. Calculate the internal resistance of the cell
A
1.85Ω
B
2.0Ω
C
2.4Ω
D
4.5Ω
E
5.0Ω
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 #25245)
Physics
WAEC / WASSCE 1996
Current Electricity & Electric Circuits
Soft iron is used in making the armature of an electric bell because it
A
retains its magnetism for a longtime
B
Loses its magnetism readily
C
Produces permanent magnets
D
is not easily magnetised
E
decreases the magnetic effect of a direct current
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 #25246)
Physics
WAEC / WASSCE 1996
Electrostatics & Capacitors
Diagram
The diagram above illustrates an isolated metal sphere carrying charge W in a medium whose permittivity is so. The magnitude of the electric field intensity at P can be expressed as
Attached Figure / Diagram
A
Q2/(4πεor2)
B
Q/(4πεor2)
C
Q/(4πεor)
D
Q2/(4πεor2)
E
Q/(4πεor) 2
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 #25247)
Physics
WAEC / WASSCE 1996
Electrostatics & Capacitors
Diagram
The electric potential at point P in the diagram above can be expressed as
Attached Figure / Diagram
A
Q2/(4πεor2)
B
Q/(4πεor2)
C
Q/(4πεor)
D
Q2/(4πεor2)
E
Q/(4πεor) 2
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 #25248)
Physics
WAEC / WASSCE 1996
Magnetism, Electromagnetism & AC Circuits
Diagram
ln the diagram above, the resistor has a resistance 8 Ω while the reactances of the inductor and the capacitor are 10 Ω and 16 Ω respectively Calculate the current in the circuit
Attached Figure / Diagram
A
3.6A
B
3.8A
C
9.2A
D
10.0A
E
13.0A
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 #25250)
Physics
WAEC / WASSCE 1996
Magnetism, Electromagnetism & AC Circuits
The resistance in a series R-C circuit is 5 Ω. If the impedance of the circuit is 13 Ω, calculate the reactance of the capacitor
A
65 Ω
B
18 Ω
C
16 Ω
D
14 Ω
E
12 Ω
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 #25251)
Physics
WAEC / WASSCE 1996
Atomic, Quantum, Nuclear Physics & Electronics
What is the decay constant of a radioactive element whose half-life is 3 seconds
A
0.132s-1
B
0.23s-1
C
0.347s-1
D
0.693s-1
E
0.924s-1
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 #25252)