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Physics
WAEC / WASSCE 1995
Current Electricity & Electric Circuits
Diagram
A ray of light is incident on mirror m1 and after reflection is incident on mirror m2 as shown in the diagram, calculate the angle of reflection of the ray at mirror m2
Attached Figure / Diagram
A
120o
B
90o
C
60o
D
45o
E
30o
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 #25073)
Physics
WAEC / WASSCE 1995
Reflection, Refraction & Dispersion of Light
Diagram
A ray of light is incident on a body x as shown in the diagram above. What is the refractive index of the body?
Attached Figure / Diagram
A
1.63
B
1.50
C
1.49
D
1.33
E
1.02
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 #25074)
Physics
WAEC / WASSCE 1995
Waves, Sound & Vibrations
Solution
Light travels in straight lines. In which of the following is this principle manifested? I. Pinhole camera II Formation of shadows III. Diffraction of light IV. Occurrence of eclipse
A
I and III only
B
II and III only
C
I, II and III only
D
I, II and IV only
E
I, II, III and IV
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
I, II, and IV are correct because they manifest the principle that light travels in a straight light while III is not correct because diffraction of light is the bending of light wave around an obstacle.
Source: Myschool Past Questions Archive (Record #25075)
Physics
WAEC / WASSCE 1995
Reflection, Refraction & Dispersion of Light
Solution
The image of any real object formed by a diverging lens is always
A
inverted
B
magnified
C
erect
D
real
E
the same size as the object
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The images formed by a diverging lens is a virtual and erect image.
Source: Myschool Past Questions Archive (Record #25076)
Physics
WAEC / WASSCE 1995
Circular Motion, Gravitation & Simple Harmonic Motion
Solution
What is the escape velocity of a body on the surface of the earth of radius R if the gravitational constant is G and the mass of the earth is M? (Neglect energy losses to the surroundings)
A
2GR
B
2G/R
C
2GR2
D
\(\sqrt{\frac{2GM}{R}}\)
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Set initial total energy to zero:
\(\frac{1}{2}mv^2 - \frac{GMm}{R} = 0\)
\(\frac{1}{2}mv^2 = \frac{GMm}{R}\)
\(v^2 = \frac{2GM}{R}\)
\(v = \sqrt{\frac{2GM}{R}}\)
Source: Myschool Past Questions Archive (Record #25087)
Physics
WAEC / WASSCE 1995
Electrostatics & Capacitors
A charge of 1.6 x 10-10C is placed in a uniform electric field of intensity 2.0 x 105NC-1. What is the magnitude of the electric force exerted on the charge?
A
3.2 x105N
B
1.8 x105N
C
3.2 x10-5N
D
1.8 x10-5N
E
4.0X10-6N
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 #25088)
Physics
WAEC / WASSCE 1995
Current Electricity & Electric Circuits
A balloon containing 546cm3 of air is heated from 0oC to 10oC. If the pressure is kept constant, what will be its volume at 10oC?
A
526cm3
B
546cm3
C
556cm
D
566cm3
E
819cm3
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 #25089)
Physics
WAEC / WASSCE 1995
Magnetism, Electromagnetism & AC Circuits
Diagram
Calculate the inductance L of the coil in the circuit shown below.
Attached Figure / Diagram
A
14.4H
B
3.8H
C
0.6H
D
0.4H
E
0.2H
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 #25090)
Physics
WAEC / WASSCE 1995
Electrostatics & Capacitors
Solution
Calculate the electric potential at a distance of 20.0cm from a point charge of 0.015C placed in air of permittivity (Take \(\frac{1}{4\piεo}\) as 9.0 x 10\(^9\) Nm\(^2\)C\(^2\))
A
3.40x106V
B
6.75x108V
C
6.75x1012V
D
3.40x105V
E
8.30 x 102V
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
To calculate the electric potential \( V \) at a distance \( r \) from a point charge \( Q \):
Given: \( Q = 0.015 \, \text{C} \), \( r = 0.20 \, \text{m} \)
\( \frac{1}{4\pi \varepsilon_0} = 9.0 \times 10^9 \, \text{N m}^2/\text{C}^2 \)
The electric potential is given by:
\(V = \frac{1}{4\pi \varepsilon_0} \cdot \frac{Q}{r} = 9.0 \times 10^9 \cdot \frac{0.015}{0.20} = 6.75 \times 10^8 \, \text{V}\)
Thus, the electric potential is: \(6.75 \times 10^8 \, \text{V}\)
Source: Myschool Past Questions Archive (Record #25091)
Physics
WAEC / WASSCE 1995
Current Electricity & Electric Circuits
A cell of e.m.f 1.5V and internal resistance 2.552 is connected in series with an ammeter resistance 0.50 and a load of resistance 7.00. Calculate the current in the circuit
A
0.15A
B
0.20A
C
2.1OA
D
3.00A
E
6.67A
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 #25102)
Physics
WAEC / WASSCE 1995
Magnetism, Electromagnetism & AC Circuits
Solution
Which of the following statements are not true of a moving-coil milliammeter? I. It can be used to measure alternating current II. It has a linear scale III. It can be adapted to read higher values of currents IV. A resistor connected in parallel with the milliammeter would convert it to a voltmeter
A
I and IV only
B
II and III only
C
III and IV only
D
I, II and III only
E
I, III and IV only
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Converting an ammeter to a voltmeter involves increasing the resistance of theammeter. This is done by adding a high resistance in series with the ammeter. Also, A moving coil meter indicates the average (mean) of a varying current through it, which is zero for AC. For this reason moving-coil meters are only usable directly for DC, not AC. Hence, I and IV are false.
Source: Myschool Past Questions Archive (Record #25103)
Physics
WAEC / WASSCE 1995
Atomic, Quantum, Nuclear Physics & Electronics
A radioactive nuclide of mass 6.09 has a half-life of 8 days. Calculate the time during which 5.25g of the nuclide would have decayed
A
1 day
B
2 days
C
8 days
D
24 days
E
42 days.
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 #25104)
Physics
WAEC / WASSCE 1995
Current Electricity & Electric Circuits
Solution
A moving-coil meter with an internal resistance of 100 \Omega has a full-scale deflection when a current of 10 mA flows through it. What value of resistance would convert it to read 10 V at full-scale deflection?
A
20
B
100
C
600
D
900
E
1000
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Galvanometer resistance = 100\Omega; Voltmeter reading = 10V, Current at full scale deflection \(I_g\) = 10mA = 0.01A
Value of resistance = \(\frac{V}{I_g}\) - r
= \(\frac{10}{0.01}\) - 100 = 1000 - 100 = 900\Omega.
Source: Myschool Past Questions Archive (Record #25105)
Physics
WAEC / WASSCE 1995
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following are emitted from a radioactive substance without altering either the nucleon number or the proton number of the substance?
A
Protons
B
Neutrons
C
Gamma rays
D
Beta particles
E
Alpha particles
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 #25106)
Physics
WAEC / WASSCE 1995
Magnetism, Electromagnetism & AC Circuits
Diagram
Calculate the inductive reactance of the circuit shown above.
Attached Figure / Diagram
A
50.00
B
5.00
C
0.50
D
0.05
E
0.02
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 #25092)