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Physics
WAEC / WASSCE 1995
Electrostatics & Capacitors
Solution
A capacitor of capacitance 25\muF is connected to an a.c. power source of frequency 200 Hz. Calculate the reactance of the capacitor
A
0.01
B
0.02
C
50.00
D
100.00
E
200.00.
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
To calculate the reactance of a capacitor, we use the formula:
\(X_C = \frac{1}{2 \pi f C}\)
Given: C = 25\(\mu\)F = 25 \(\times 10^{-6}\), F = 200 Hz
Substituting the values into the formula, we approximate \( \pi \) as 10:
\(X_C = \frac{1}{2 \times 10 \times 200 \times (25 \times 10^{-6})}\)
Calculating this: \(X_C = \frac{1}{2 \times 10 \times 200 \times 25 \times 10^{-6}} = \frac{1}{0.01} = 100 \Omega\)
Thus, the capacitive reactance is: 100\( \Omega\)
Source: Myschool Past Questions Archive (Record #25094)
Physics
WAEC / WASSCE 1995
Electrostatics & Capacitors
Solution
The energy stored in a capacitor of capacitance 5\muF is 40J. Calculate the voltage applied across its terminals?
A
4000V
B
200V
C
16V
D
6V
E
4V
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(E = \frac{CV^{2}}{2}\)
\(V^{2} = \frac{2E}{C}\)
\(V^{2} = \frac{2\times 40}{5 \times 10^{-6}}\)
\(V^{2} = 16 \times 10^{6}\)
\(V = 4 \times 10^{3} = 4000v\)
Source: Myschool Past Questions Archive (Record #25095)
Physics
WAEC / WASSCE 1995
Electrostatics & Capacitors
Diagram
The effective capacitance between points X and Y in the diagram below is 1.0μF, What is the value of the capacitance C, measured in micro-farad?
Attached Figure / Diagram
A
5.0μF
B
4.0μF
C
3.0μF
D
1.0μF
E
0.5μF
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 #25096)
Physics
WAEC / WASSCE 1995
Current Electricity & Electric Circuits
Calculate the quantity charge flowing through a conductor if a current of 10A passes through the conductor for 10s.
A
100C
B
20C
C
15C
D
10C
E
1C
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 #25097)
Physics
WAEC / WASSCE 1995
Magnetism, Electromagnetism & AC Circuits
Diagram
An alternating current, having the waveform shown in the diagram above, is represented by the equation x = Xo sinwt. Which of the following represents Xo?
Attached Figure / Diagram
A
OS
B
OR
C
PQ
D
RT
E
OT
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 #25098)
Physics
WAEC / WASSCE 1995
Current Electricity & Electric Circuits
Diagram
What is the potential difference between X and Y in the diagram above if the battery is of negligible internal resistance
Attached Figure / Diagram
A
12.5V
B
5.8V
C
5.0V
D
3.0V
E
2.0V
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 #25099)
Physics
WAEC / WASSCE 1995
Current Electricity & Electric Circuits
Diagram
Solution
Calculate the current in the 30 resistor in the diagram above if the battery is of negligible internal resistance
Attached Figure / Diagram
A
0.3A
B
0.4A
C
1.0A
D
1.5A
E
2.5A
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Voltage across 0.8 \Omega = 2 V
→ Current through 0.8 \Omega (total current) = \(\frac{2}{0.8}\) = 2.5 A
The 3 \Omega and 2 \Omega are in parallel.
Current through 3 \Omega resistor = total current x (\(\frac{2}{(3 + 2)}\))
= 2.5 x (\(\frac{2}{5}\)) = 1.0 A
Source: Myschool Past Questions Archive (Record #25100)
Physics
WAEC / WASSCE 1995
Waves, Sound & Vibrations
Which of the following is a wind instrument?
A
Guitar
B
Organ
C
Violin
D
Piano
E
Harp
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 #25101)
Physics
WAEC / WASSCE 1995
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following is not a product of nuclear fission?
A
Alpha particle
B
Beta particle
C
Gamma ray
D
X-ray
E
Neutron
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 #25107)
Physics
WAEC / WASSCE 1995
Gas Laws & Heat Transfer
Which of the following cannot be explained by the molecular theory of matter?
A
Conduction
B
Radiation
C
Convection
D
Evaporation
E
Expansion
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 #25108)
Physics
WAEC / WASSCE 1995
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following is used for shielding radioactive fall-outs?
A
Plastic
B
Wood
C
Textile
D
Aluminium
E
Lead
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 #25109)
Physics
WAEC / WASSCE 1995
Waves, Sound & Vibrations
A listener can detect the instrument from which a note is being sounded because different instruments produce the same note with a different.
A
frequencies
B
pitches
C
loudness
D
intensities
E
overtones
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 #25086)
Physics
WAEC / WASSCE 1995
Current Electricity & Electric Circuits
Solution
When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that in Q. lf the masses of P and Q are the same, calculate the ratio of the specific heat capacities of Q to P.
A
4 : 1
B
2 : 1
C
1 : 1
D
1 : 2
E
1 : 4.
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The heat absorbed by a substance is given by the formula:
Q = m \times c \times \DeltaT
For objects P and Q.
- Same quantity of heat (Q) is supplied.
- Same mass (m).
- Temperature change in P is twice that in Q (\DeltaT\(_P\) = 2 \times \DeltaT\(_Q\)).
For P
Q = m \times c\(_P\) \times (2 \times \DeltaT\(_Q\))
For Q:
Q = m \times c\(_Q\) \times \DeltaT\(_Q\)
Since both equal **Q**, set them equal:
m \times c\(_P\) \times 2\DeltaT\(_Q\) = m \times c\(_Q\) \times \DeltaT\(_Q\)
Cancel m and \DeltaT\(_Q\) from both sides:
2 c\(_P\) = c\(_Q\)
Therefore:
\(\frac{c_Q }{ c_P}\) = 2
Ratio c\(_Q : c_P\) = 2 : 1
Source: Myschool Past Questions Archive (Record #25072)
Physics
UTME / JAMB 1995
Units, Measurements & Dimensional Analysis
Solution
Which of the following is the dimension of pressure?
A
ML-1T-2
B
MLT-2
C
ML2T-3
D
ML-3
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Pressure = heg
= m x \(\frac{kg}{m^3}\) x \(\frac{m}{5^2}\)
= ML-1T-2
Source: Myschool Past Questions Archive (Record #27748)
Physics
UTME / JAMB 1995
Current Electricity & Electric Circuits
Solution
The length of a displaced pendulum ball which passes its lowest point twice every seconds is [g = 10ms-2]
A
0.25 m
B
0.45 m
C
0.58m
D
1.00m
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
T = 2\(\pi\) \(\sqrt\frac{L}{g}\)
1 = 2 x 3.142\(\sqrt\frac{L}{10}\)
(since the pendulum pass its lowest point twice in a second, hence the frequency is 1 and period T= \(\frac{1}{F}\))
L= 0.25m
Source: Myschool Past Questions Archive (Record #27751)