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Physics
WAEC / WASSCE 1997
Magnetism, Electromagnetism & AC Circuits
Solution
The relationship between the directions of magnetic field, the current-carrying wire in the field is easily remembered using
A
Octet rule
B
Right hand grip rule
C
Maxwell’s screw rule
D
Ampere’s swimming rule
E
Fleming’s left hand rule
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The Right Hand Grip Rule (or Right Hand Rule) is used to determine the direction of the magnetic field around a current-carrying conductor. If you grip the wire with your right hand such that your thumb points in the direction of the current, your fingers will curl in the direction of the magnetic field lines.
Source: Myschool Past Questions Archive (Record #26315)
Physics
WAEC / WASSCE 1997
Magnetism, Electromagnetism & AC Circuits
Solution
The current in the primary coil of a transformer is 2.5A. If the coil has 50 turns and the secondary250 turns, calculate the current in the secondary coil. Neglect energy losses in the transformer
A
0.2A
B
0.5A
C
2.5A
D
5A
E
12.5A
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\frac{I_s}{I_p}=\frac{n_p}{n_s}, I_s= \frac{I_pn_p}{n_s}=\frac{2.5\times50}{250}\Rightarrow0.5A\)
Source: Myschool Past Questions Archive (Record #26316)
Physics
WAEC / WASSCE 1997
Work, Energy, Power & Simple Machines
In a photocell, light energy is converted to
A
Electrical energy
B
Chemical energy
C
Heat energy
D
Mechanical energy
E
Kinetic energy
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 #26317)
Physics
WAEC / WASSCE 1997
Waves, Sound & Vibrations
Two identical waves traveling in the same direction are superimposed. What should be the phase difference between the waves for maximum destructive interference to occur?
A
20°
B
45°
C
180°
D
225°
E
270°
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 #26318)
Physics
WAEC / WASSCE 1997
Current Electricity & Electric Circuits
When a resistor of resistance R is connected across a cell, the terminal p.d of the cell is reduced to three quarters of its e.m.f. The internal resistance of the cell is expressed as
A
R/4
B
R/3
C
R/2
D
3R/4
E
3R
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 #26319)
Physics
WAEC / WASSCE 1997
Current Electricity & Electric Circuits
A pipe open at both ends, produces a fundamental note. If the velocity of sound in air is V and L the length of the pipe, which of the following expresses the frequency of the note? Neglect end correction
A
2V/L
B
V/2L
C
V/3L
D
V/4L
E
V/5L
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 #26320)
Physics
WAEC / WASSCE 1997
Waves, Sound & Vibrations
Which of the following statements is not correct?
A
The pitch of a note depends on the frequency of the vibrating source
B
The loudness of a note depends on its intensity
C
The velocity of sound in air does not depend on the intensity of the note producing it
D
The overtones present in a note determine its quality
E
Wind speed effects on the speed of sound in air
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 #26321)
Physics
WAEC / WASSCE 1997
Waves, Sound & Vibrations
Solution
A progressive wave has a wavelength of 50cm. calculate the phase difference between two points at a distance of 20cm apart.
A
10/3π
B
5/2 π
C
4/5 π
D
2/3 π
E
π/3
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Phase difference = \(\frac{2\pi x}{\lambda}\)
= \(\frac{2\pi \times 20}{50}\)
= \(\frac{4}{5} \pi\)
Source: Myschool Past Questions Archive (Record #26322)
Physics
WAEC / WASSCE 1997
Magnetism, Electromagnetism & AC Circuits
Solution
An alternating current with a peak value of 5A passes through a resistor of resistance 10Ω. Calculate the rate at which energy is dissipated in the resistor
A
250W
B
125W
C
50W
D
35.4W
E
12.5W
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Given: Peak current, \( I_{\text{peak}} = 5 \, \text{A} \), Resistance, \( R = 10 \, \Omega \)
Calculate the rms current: The rms current is given by:
\(I_{\text{rms}} = \frac{I_{\text{peak}}}{\sqrt{2}} = \frac{5}{\sqrt{2}} \approx 3.54 \, \text{A}\)
Calculate the power dissipated in the resistor: Using the rms value, the power can be calculated as:
\(P = I_{\text{rms}}^2 \cdot R\)
Substituting the values:
\(P = \left(\frac{5}{\sqrt{2}}\right)^2 \cdot 10\)
Calculating:
\(P = \frac{25}{2} \cdot 10 = 125 \, \text{W}\).
Source: Myschool Past Questions Archive (Record #26323)
Physics
WAEC / WASSCE 1997
Current Electricity & Electric Circuits
The invisible part of the spectrum of a white light consists of the following colors
A
Red, orange and yellow only
B
Infra-red, ultraviolet and blue only
C
Indigo and green only
D
Violet and red only
E
Ultra violet and infra-red only
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 #26324)
Physics
WAEC / WASSCE 1997
Lenses & Optical Instruments
Which of the following is not true of the similarities between a camera and the human eye?
A
Both the camera and the human eye have light proof interiors
B
Both the camera and the human eye have light sensitive screens
C
Inverted images are formed on the screen in both
D
The distance between the lens and the screen is fixed in both
E
The amount of light entering both the eye and the camera can be adjusted
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 #26325)
Physics
WAEC / WASSCE 1997
Lenses & Optical Instruments
Solution
The magnification produced with a converging lens is 5. If the object is a square wire gauze of side 2cm, calculate the area of the image
A
100\(cm^2\)
B
40\(cm^2\)
C
20\(cm^2\)
D
10\(cm^2\)
E
4\(cm^3\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
To calculate the area of the image produced by a converging lens, we can use the magnification formula:
\(\text{Magnification} \, (M) = \frac{\text{Height of image}}{\text{Height of object}}\)
Given that the magnification \( M = 5 \) and the side of the square wire gauze (the object) is \( 2 \, \text{cm} \), we can find the height of the image:
\(\text{Height of image} = M \times \text{Height of object} = 5 \times 2 \, \text{cm} = 10 \, \text{cm}\)
Since the object is a square, the area of the object is:
\(\text{Area of object} = \text{side}^2 = (2 \, \text{cm})^2 = 4 \, \text{cm}^2\)
The area of the image can be calculated using the square of the magnification:
\(\text{Area of image} = M^2 \times \text{Area of object} = 5^2 \times 4 \, \text{cm}^2 = 25 \times 4 \, \text{cm}^2 = 100 \, \text{cm}^2\)
Thus, the area of the image is: 100cm\(^2\)
Source: Myschool Past Questions Archive (Record #26326)
Physics
WAEC / WASSCE 1997
Magnetism, Electromagnetism & AC Circuits
A magnet is being inserted into a coil of wire. On which of the following factors does the induced e.m.f in the coil depend? I. Number of turns in the coil II. Strength of the coil III. Speed with which magnet is inserted into the coil.
A
I only
B
II only
C
III only
D
I and II only
E
I, II,III only
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 #26327)
Physics
WAEC / WASSCE 1997
Magnetism, Electromagnetism & AC Circuits
The current in a series R-L-C circuit attains its maximum value when the
A
Impedance is greater than the capacitive reactance
B
Inductive reactance is equal to the capacitive reactance
C
Inductive reactance is greater than the capacitive reactance
D
capacitive reactance is less than resistance
E
Inductive reactance is greater than the capacitive reactance
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 #26328)
Physics
WAEC / WASSCE 1997
Electrostatics & Capacitors
Solution
A charge of 1 x \(10^{-5}\)C experiences a force of 40N at a certain point in space. What is the magnitude of the electric field intensity at the point in Newton and couloumb
A
8 x \(10^{6}\)
B
4 x \(10^{6}\)
C
3 x \(10^{-4}\)
D
2 x \(10^{-4}\)
E
5 x \(10^{-7}\)
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(E= \frac{F}{O}= \frac{40}{1\times10^{-5}}=4 \times10^{6}\)
Source: Myschool Past Questions Archive (Record #26329)