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Physics
UTME / JAMB 1992
Current Electricity & Electric Circuits
Solution
Which of the following factors has no effect on the e.m.f. of a primary cell?
A
temperature
B
size of the cell
C
nature of the plate
D
nature of the electrolyte
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The e.m.f. is primarily influenced by temperature, the nature of the plates, and the nature of the electrolyte, but not by the size of the cell itself.
Source: Myschool Past Questions Archive (Record #28104)
Physics
UTME / JAMB 1992
Current Electricity & Electric Circuits
Solution
A wire of length 15m made of a material of resistivity 1.8 x 10-6\(\Omega\)m has a resistance of 0.27\(\Omega\). Determine the area of the wire
A
1.5 x 10-4m2
B
1.0 x 10-4m2
C
2.7 x 10-5m2
D
7.3 x 10-6m2
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Resistivity = \(\frac{\text {Resiatance x Area}}{length}\)
1.6 x 10-6 = \(\frac{15 \times Area}{0.27}\)
Area = 1.0 x 10-4m2
Source: Myschool Past Questions Archive (Record #28105)
Physics
UTME / JAMB 1992
Electrostatics & Capacitors
Solution
A 5-v battery is connected across the plates of a 2.0\(\mu\)F uncharged parallel plate capacitor. The charge on the capacitor after a long time is
A
2.5\(\mu\)C
B
10.0\(\mu\)C
C
20.0\(\mu\)C
D
50.0\(\mu\)C
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Q = cv
= 2 x 10-6 x 5
= 10 x 10-6C
= 10.0\(\mu\)C
Source: Myschool Past Questions Archive (Record #28106)
Physics
UTME / JAMB 1992
Current Electricity & Electric Circuits
Solution
Which of the following apparatus will require the smallest fuse rating for its protection?
A
60W, 240V
B
60W, 40V
C
40W, 12V
D
40W, 5V
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
I = \(\frac{P}{V}\) = \(\frac{60}{240}\) = 0.25A
I = \(\frac{P}{V}\) = \(\frac{60}{40}\) = 1.5A
I = \(\frac{P}{V}\) = \(\frac{40}{12}\) = 3.3A
I = \(\frac{P}{V}\) = \(\frac{40}{5}\) = 8A
Source: Myschool Past Questions Archive (Record #28107)
Physics
UTME / JAMB 1992
Current Electricity & Electric Circuits
The heat produced in a conductor carrying an electric current is
A
inversely proportional to the current and the resistance
B
directly proportional to the current, resistance and the time
C
inversely proportional to of the resistance, current and the time
D
directly proportional to the square of the current, the resistance and the time
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 #28108)
Physics
UTME / JAMB 1992
Current Electricity & Electric Circuits
The maximum permissible current through a galvanometer G of internal resistance 10\(\Omega\) is 0.05A. A resistance R is used to convert G into a voltmeter with a maximum reading of 100V. Find the value of R and how it is connected to G
A
20,000 ohms in parallel
B
19,990 ohms in series
C
1990 ohms in series
D
100 ohms in series
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 #28109)
Physics
UTME / JAMB 1992
Magnetism, Electromagnetism & AC Circuits
In alternating current theory, the units of impedance, r.m.s. voltage and resonance frequency are respectively equal to
A
volt, ampere and hertz
B
ohms, volt and hertz
C
watt, ohms and radian
D
ohms, hertz and joule
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 #28110)
Physics
UTME / JAMB 1992
Magnetism, Electromagnetism & AC Circuits
In A.C circuit theory, the root means square (r.m.s) current, Irms and the peak (maximum)current Io are related by
A
Io = \(\frac{I_rms}{\sqrt{2}}\)
B
Irms = \(\frac{I_o}{\sqrt{2}}\)
C
Irms = \(\frac{\frac{I}{I_o}}{\sqrt2}\)
D
Irms = \(\frac{I_rms}{\sqrt{2}}\)
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 #28111)
Physics
UTME / JAMB 1992
Atomic, Quantum, Nuclear Physics & Electronics
The threshold of frequency for photoelectric effect depends on the
A
intensity of incident light
B
frquency of incident light
C
material of the photocathode
D
potential difference between the cathode and the anode
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 #28112)
Physics
UTME / JAMB 1992
Atomic, Quantum, Nuclear Physics & Electronics
Solution
After three half lifes, the fraction of a radioactive material that has decayed is
A
\(\frac{1}{8}\)
B
\(\frac{1}{3}\)
C
\(\frac{2}{3}\)
D
\(\frac{7}{8}\)
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
I = \(\frac{1}{2}\) \(\Rightarrow\) \(\frac{1}{4}\) \(\Rightarrow\) \(\frac{1}{8}\)
Fraction decayed = 1 - \(\frac{1}{8}\)
= \(\frac{7}{8}\)
Source: Myschool Past Questions Archive (Record #28113)
Physics
UTME / JAMB 1992
Atomic, Quantum, Nuclear Physics & Electronics
Solution
\(^{27}_{13}Al\) + \(^{1}_{0}n\) \(\Rightarrow\) \(^{24}_{11}Na\) + X
A
a proton
B
a gamma ray
C
a helium particle
D
an alpha particle
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(^{27}_{13}Al\) + \(^{1}_{0}n\) \(\Rightarrow\) \(^{24}_{11}Na\) + \(^{b}_{a}X\)
a + 11 = 0 + 13 \(\Rightarrow\) a = 2
b + 24 = 1 + 27 \(\Rightarrow\) b = 4
\(^{b}_{a}X\) = \(^{4}_{2}\alpha\)
Source: Myschool Past Questions Archive (Record #28114)
English Language
UTME / JAMB 1992
Question Tags, Modals & Pronouns
Solution
It would be more realistic of economists to
A
Accept the unreliability of Nigeria’s census figures
B
Ascertain how many Nigerians there are
C
Discard the disputed 1963 census figures
D
Accept marginal errors in the census figures
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
The passage begins by saying:
“If economists were a bit more modest, they would admit that no one knows exactly how many Nigerians there are.”
This statement clearly suggests that economists should acknowledge or accept the uncertainty and unreliability of Nigeria’s population figures rather than act as if they have precise data.
Source: Myschool Past Questions Archive (Record #15314)
English Language
UTME / JAMB 1992
Concord (Subject-Verb Agreement)
Precise national population figures are required in order to
A
Know the number of people to cater for in the Universal Primary Education programme
B
Be able to undertake proper implementation of governmental policies
C
Avert unanticipated expenditure
D
Be able to speak of population statistics with confidence
medium Difficulty
Verified Correct Answer: Option B
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #15315)
Physics
UTME / JAMB 1992
Temperature, Thermometry & Thermal Expansion
Solution
A platinum resistance thermometer wire has a resistance of 5 ohms at 0oC and 5.5 ohms at 100oC. Calculate the temperature of the wire when the resistance is 5.2 ohms
A
80oC
B
60oC
C
40oC
D
10oC
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
100oC .... 5.5
\(\theta\)oC .... 5.3
0oC .... 5.0
\(\frac{\theta - 0}{100 - 0}\) = \(\frac{5.5 - 5 .0}{5.5 - 5.0}\)
\(\theta\) = 40oC
Source: Myschool Past Questions Archive (Record #28056)
English Language
UTME / JAMB 1992
Lexis, Structure & Register (Cloze & Vocabulary)
‘The contentious nature of the subject’ refers to the
A
The population
B
The disputed 1963 census figures
C
Development planning
D
Revenue allocation
medium Difficulty
Verified Correct Answer: Option D
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #15316)