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Physics
WAEC / WASSCE 2002
Lenses & Optical Instruments
Solution
In a compound microscope, the image formed by the objective lens is at a distance of 3.0cm from the eye lens. If the final image is at 25.0cm from the eye lens, calculate the focal length of the eye lens
A
0.3cm
B
2.7cm
C
3.4cm
D
8.3cm
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
To find the focal length of the eye lens in a compound microscope, we use the lens formula:
\(\frac{1}{f} = \frac{1}{v} - \frac{1}{u}\)
Given: Image distance from the eye lens: \( v_2 = 25.0 \, \text{cm}\)
Object distance for the eye lens (image from the objective lens): \( u = -3.0 \, \text{cm} \) (negative since it is on the same side as the incoming light)
\(\frac{1}{f} = \frac{1}{25.0} - \frac{1}{-3.0}\)
\(\frac{1}{f} = \frac{1}{25.0} + \frac{1}{3.0}\)
\(\frac{1}{25.0} = 0.04 \quad \text{and} \quad \frac{1}{3.0} \approx 0.3333\)
\(\frac{1}{f} = 0.04 + 0.3333 \approx 0.3733\)
\(f \approx \frac{1}{0.3733} \approx 2.68 \, \text{cm}\)
The focal length of the eye lens is approximately \( 2.68 \, \text{cm} \).
Source: Myschool Past Questions Archive (Record #34084)
Physics
WAEC / WASSCE 2002
Current Electricity & Electric Circuits
Solution
A pulse of a sound is transmitted from a ship and the reflection from the sea bed is recorded after 0.2s. Calculate the depth of the sea. [Take speed of sound in sea water = 1560ms-1]
A
312.0m
B
156.0m
C
78.0m
D
31.2m
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
x = \(\frac{vt}{2} = \frac{1560 \times 0.2}{2} = 156m\)
Source: Myschool Past Questions Archive (Record #34085)
Physics
WAEC / WASSCE 2002
Waves, Sound & Vibrations
When two notes of nearly equal frequencies are sounded together, a periodic rise and fall in sound intensity can be heard. This phenomenon can be called
A
beats
B
diffraction
C
overtones
D
resonance
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 #34086)
Physics
WAEC / WASSCE 2002
Waves, Sound & Vibrations
Which of the following instruments is not a wind instrument?
A
clarinet
B
saxophone
C
trumpet
D
xylophone
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 #34087)
Physics
WAEC / WASSCE 2002
Current Electricity & Electric Circuits
Which of the following actions will not cause an increase in the frequency of a vibrating string?
A
increasing the tension of the string
B
decrease the mass per unit lengthof the string
C
decrease the length of the string
D
increasing the cross sectional area of the string
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 #34088)
Physics
WAEC / WASSCE 2002
Electrostatics & Capacitors
Which of the following items can be used to compare the relative magnitudes of electric charges on two bodies?
A
ebonite rod
B
gold leaf electroscope
C
proof plane
D
the electrophorus
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 #34089)
Physics
WAEC / WASSCE 2002
Electrostatics & Capacitors
Solution
Three capacitors each of capacitance 18\(\mu F\) are connected in series. Calculate the effective capacitance of the capacitors
A
54.00\(\mu F\)
B
18.00\(\mu F\)
C
6.00\(\mu F\)
D
0.17\(\mu F\)
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\frac{1}{c} = \frac{1}{18} + \frac{1}{18} + \frac{1}{18} = \frac{3}{18}\)
c = 6\(\mu F\)
Source: Myschool Past Questions Archive (Record #34097)
Physics
WAEC / WASSCE 2002
Current Electricity & Electric Circuits
Solution
Two spheres of masses 100kg and 90kg respectively have their centres separated by a distance of 1.0m. Calculate the magnitude of the force of attraction between them. [G = 6.70 x 10-11Nm-2kg-2]
A
6.70 x 10-11N
B
6.70 x 10-10N
C
6.03 x 10-11N
D
6.03 x 10-7N
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
F = \(\frac{Gm_1m_2}{r^2} = 6.7 \times 10^{11} \times \frac{100 \times 90}{1^2} = 6.03 \times 10^{-7}N\)
Source: Myschool Past Questions Archive (Record #34098)
Physics
WAEC / WASSCE 2002
Circular Motion, Gravitation & Simple Harmonic Motion
Solution
The magnitude of the gravitational attraction between the earth and a particle is 40N. If the mass of the particle is 4kg. Calculate the magnitude of the gravitational field intensity of the earth on the particle
A
10.0N kg-1
B
12.6N kg-1
C
25.0N kg-1
D
160.0N kg-1
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
g = \(\frac{f}{m} = \frac{40}{4} = 10N kg^{-1}\)
Source: Myschool Past Questions Archive (Record #34102)
Physics
WAEC / WASSCE 2002
Current Electricity & Electric Circuits
Local actions is normally prevented in a simple electric cell by
A
introducing an oxidizing agent in the acid
B
not drawing current continously for long period
C
amalgamating the surface of the zinc plate
D
using a porous pot to isolate the zinc plate from the acid
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 #34103)
Physics
WAEC / WASSCE 2002
Current Electricity & Electric Circuits
The lead-acid accumulator consists of a
A
lead as the positive electrode
B
lead ocide as the negative electrode
C
hydrochloric acid as the electrolyte
D
tetraoxosulphate(VI) acid as the electrolyte
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 #34104)
Physics
WAEC / WASSCE 2002
Magnetism, Electromagnetism & AC Circuits
Which of the following actions will not lead to an increase in the induced e.m.f. in a coil of wire rotating between the poles of a magnet? Increasing the
A
strength of the magnet
B
number of turns in the coil
C
speed of location in the coil
D
gap between the poles of the magnet
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 #34105)
Physics
WAEC / WASSCE 2002
Magnetism, Electromagnetism & AC Circuits
A transformer has 400 turns and 200 turns in the primary and secondary windings respectively. If the current in the primary and secondary windings are 3A and 5A respectively. calculate the efficiency of the transformer?
A
85.0%
B
83.3%
C
37.5%
D
30.0%
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 #34108)
Physics
WAEC / WASSCE 2002
Current Electricity & Electric Circuits
Which of the following materials is used to control the rate of neutron production in a nuclear reactor?
A
boron rods
B
concrete shield
C
graphite rods
D
uranium rods
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 #34146)
Physics
WAEC / WASSCE 2002
Atomic, Quantum, Nuclear Physics & Electronics
A nuclide X is produced by bombarding a nitrogen(N) nucleus with an alpha(\alpha\) particle with the release of heavy hydrogen(D) nucleus as shown by the following nuclear equation, \(\alpha + ^{14}_{7}N \to ^p_qX + ^2_1D\). Determine the values of p and q in the equation
A
12 and 6
B
14 and 7
C
16 and 8
D
19 and 8
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 #34148)