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Physics
UTME / JAMB 1988
Current Electricity & Electric Circuits
Solution
Two strings of the same length and under the same tension gives notes of frequencies in the ratio 4 : 1. The masses of the strings are in the corresponding ratio of
A
2 : 1
B
1 : 2
C
1 : 4
D
1 : 16
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
F = \(\frac{1}{2L}\)\(\sqrt\frac{T}{m}\)
\(\frac{F_1}{F_2}\) = \(\sqrt\frac{m_2}{m_1}\)
\(\frac{1}{4}\) = \(\sqrt\frac{m_2}{m_1}\)
\(\frac{m_2}{m_1}\) = \(\frac{1}{16}\)
Source: Myschool Past Questions Archive (Record #28385)
Physics
UTME / JAMB 1988
Lenses & Optical Instruments
Solution
To obtain a magnification of 2.5, how far should an object be placed from the pole of a thin converging lens of focal length 0.20m?
A
0.13m
B
0.25m
C
0.28m
D
0.50m
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
v = 2.5u
F = \(\frac {uv}{u + v}\)
0.2 = \(\frac {u \times 2.5u}{u + 2.5u}\)
u = 0.28m
Source: Myschool Past Questions Archive (Record #28386)
Physics
UTME / JAMB 1988
Reflection, Refraction & Dispersion of Light
Solution
An object is placed 10cm in front of a concave mirror of focal length 15cm. What is the position and nature of the image formed?
A
30cm and virtual
B
6cm and real
C
6cm and virtual
D
30cm and real
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
F = \(\frac{uv}{u + v}\)
15 = \(\frac{10 \times v}{10 + v}\)
v = -30cm
Source: Myschool Past Questions Archive (Record #28387)
Physics
UTME / JAMB 1988
Reflection, Refraction & Dispersion of Light
Which of the following phenomena explains the formation of a mirage? i. Reflection ii. Refraction iii. Diffraction
A
i and ii only
B
ii and iii only
C
i and iii only
D
i, ii, and iii only
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 #28388)
Physics
UTME / JAMB 1988
Waves, Sound & Vibrations
Solution
When white light is dispersed by a spectrometer, the component having the shortest wavelength is
A
orange
B
green
C
violet
D
red
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Wavelength Order: In the visible spectrum, the order of colors from shortest to longest wavelength is as follows: violet, blue, green, yellow, orange, and red.
Therefore, violet light has the shortest wavelength, making it the first color in the spectrum when white light is dispersed.
Source: Myschool Past Questions Archive (Record #28389)
Physics
UTME / JAMB 1988
Waves, Sound & Vibrations
Solution
Which of the following statement is TRUE of ultraviolet, visible and infra-red rays?
A
they are all electromagnetic waves with the same wavelength
B
ultra-violet rays have shorter wavelengths than infra-red rays and produce flourescence
C
infrared rays have shorter wavelength than visible light and produce the sensation of heat
D
the wavelenghts increase in the sequence: visible, ultra-violet, infra-red
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Ultra-violet (UV) rays have shorter wavelengths than infra-red (IR) rays.
This is correct. In the electromagnetic spectrum:
UV → shorter wavelength than visible light
Visible light → in the middle
IR → longer wavelength than visible light
So, UV has a much shorter wavelength than IR.
- UV rays produce fluorescence.
This is also correct. Ultraviolet rays are well-known for causing certain materials (like fluorescent dyes, whitening agents, or minerals) to glow or emit visible light — this is called fluorescence. It's commonly used in black lights, forensic science, etc.
Source: Myschool Past Questions Archive (Record #28390)
Physics
UTME / JAMB 1988
Current Electricity & Electric Circuits
A spectrum of sunlight is said to be impure when
A
it is made of only three colours
B
it has no red colour in it
C
the different colours in it overlap
D
it does not contain white light
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 #28391)
Physics
UTME / JAMB 1988
Work, Energy, Power & Simple Machines
Solution
A cell of internal resistance 2 ohms supplies current to a 6 ohms resistor. The efficiency of the cell is
A
12.0%
B
25.0%
C
33.3%
D
75.0%
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Efficiency = \(\frac{IR}{I(R + r)}\) x 100
= \(\frac{6}{I(2 + 6)}\) x 100
= 75%
Source: Myschool Past Questions Archive (Record #28392)
Physics
UTME / JAMB 1988
Current Electricity & Electric Circuits
Solution
When a resistance R is across a cell, the voltage across the terminals of the cell is reduced to two-third of its normal value. The internal resistance of the cell is
A
\(\frac{2}{1}\)R
B
\(\frac{1}{2}\)R
C
\(\frac{3}{2}\)R
D
5R
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
IR = \(\frac{2}{3}\) I(R + r)
r = \(\frac{1}{2}\)R
Source: Myschool Past Questions Archive (Record #28393)
Physics
UTME / JAMB 1988
Calorimetry, Latent Heat & Change of State
Solution
A household refrigerator is rated 200 watts. If electricity costs 5k per kWh, what is the cost of operating it in 20 days?
A
N4.80
B
N48.00
C
N480.00
D
N4800.00
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Energy(kWhr) = 200 x 10\(^{-3}\) x 20 x 24
= 96kwhr
1 kwhr cost 5 kobo; 96 kwhr will cost
5 x 96 = 480 kobo
= N4.80
Source: Myschool Past Questions Archive (Record #28394)
Physics
UTME / JAMB 1988
Current Electricity & Electric Circuits
Solution
Which of the following ammeters may be used to measure alternating currents? i. moving-coil ammeter ii. moving-iron ammeter iii. hot-wire ammeter
A
i and ii only
B
ii and iii only
C
i and iii only
D
i, ii, and iii
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Moving-coil ammeter: Primarily used for direct current (DC) only, as it relies on a constant magnetic field and does not accurately respond to AC.
Moving-iron ammeter: Suitable for measuring both AC and DC currents. It operates based on the magnetic effect of the current, making it effective for AC.
Hot-wire ammeter: Specifically designed for measuring AC currents. It utilizes the heating effect of the current and provides accurate readings for AC.
Source: Myschool Past Questions Archive (Record #28395)
Physics
UTME / JAMB 1988
Current Electricity & Electric Circuits
The principle of operation of an induction coil is based on
A
Ohm's law
B
Amphere's law
C
Faraday's law
D
Columbs law
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 #28396)
Physics
UTME / JAMB 1988
Work, Energy, Power & Simple Machines
A dynamo primarily combines
A
mechanical energy into electrical energy
B
electrical energy into kinetic energy
C
potential energy into kinetic energy
D
kinetic energy into potential 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 #28397)
Physics
UTME / JAMB 1988
Atomic, Quantum, Nuclear Physics & Electronics
Solution
In a certain fusion reaction, a deuteron (\(^{2}_{1}H\)) interacts with a triton (\(^{3}_{1}He\)) and produces an a-particle (\(^{4}_{2}He\)) and a second product. The second product is
A
a proton
B
an electron
C
a neutron
D
a gamma ray
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(^{2}_{1}H\) + \(^{3}_{1}H\) \(\to\) \(^{4}_{2}He\) + \(^{1}_{0}He\)
Source: Myschool Past Questions Archive (Record #28398)
Physics
UTME / JAMB 1988
Current Electricity & Electric Circuits
Which of the following symbolic representations is correct for an atom X with 22 electrons and 43 neutrons?
A
\(^{43}_{22}X\)
B
\(^{22}_{43}X\)
C
\(^{65}_{43}X\)
D
\(^{65}_{22}X\)
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 #28399)