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Physics
UTME / JAMB 1993
Current Electricity & Electric Circuits
Solution
The terminal voltage of a battery is 4.0V when supplying a current of 2.0A, and 2.0V when supplying a current of 3.0A. The internal resistance of the battery is
A
0.5 \(\Omega\)
B
1.0\(\Omega\)
C
2.0\(\Omega\)
D
4.0\(\Omega\)
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
E = 4 + 2r and E = 2 + 3r
therefore, r = 2\(\Omega\)
Source: Myschool Past Questions Archive (Record #28013)
Physics
UTME / JAMB 1993
Current Electricity & Electric Circuits
Solution
A current of 100mA passes through a conductor for 2 minutes. The quantity of electricity transported is
A
200C
B
50C
C
12C
D
0.002C
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Q = it
= 100 x 10-3 x 2 x 60
= 12C
Source: Myschool Past Questions Archive (Record #28014)
Physics
UTME / JAMB 1993
Electrostatics & Capacitors
Solution
A parallel plate capacitor of area 10cm2 in vacuum has a capacitance of 10-2\(\mu\)F. What is the distance between the plates?(e = 9 x 10-12fm)
A
9 x 10-13m
B
9 x 10-7m
C
9 x 10-3m
D
9 x 107m
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
C = \(\frac {\varepsilon_o\ A}{d}\)
10-2 x 10-6 = \(\frac {9 \times 10 ^{-12}}{d}\) x 10-4
= 9 x 10-7m
Source: Myschool Past Questions Archive (Record #28015)
Physics
UTME / JAMB 1993
Current Electricity & Electric Circuits
Solution
A 40-W instrument has a resistance of 90\(\Omega\). On what voltage should it be operated normally?
A
60V
B
150V
C
225V
D
3600V
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
P = \(\frac{V}{R}\)
V = \(\sqrt{PR}\)
V = \(\sqrt{40 \times 90}\)
= 60V
Source: Myschool Past Questions Archive (Record #28016)
Physics
UTME / JAMB 1993
Magnetism, Electromagnetism & AC Circuits
Solution
Which of the following devices may be used to step up the voltage in a d.c. circuit?
A
a step-up transformer
B
a d.c. generator
C
a wattmeter
D
an induction coil
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
An induction coil is a transformer for producing high-voltage alternating current from a low-voltage direct current, consisting essentially of two concentric coils with a common soft-iron core, a primary coil with relatively few windings of heavy wire, and a secondary coil with many turns of fine wire. Excitation of the primary coil by rapidly interrupted or variable current induces high voltage in the secondary coil.
Source: Myschool Past Questions Archive (Record #28017)
Physics
UTME / JAMB 1993
Current Electricity & Electric Circuits
The primary aim in high tension transmission is to
A
minimize electrical energy losses due to heat production
B
increase the rate of energy transfer by using high voltage
C
increase the current in the wire
D
generate electricity at high current and low voltage
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 #28018)
Physics
UTME / JAMB 1993
Magnetism, Electromagnetism & AC Circuits
Solution
Determine the inductive reactance when a 30.0mH inductor with a negligible resistance is connected to a 1.3 x 103Hz oscillator.
A
39.0\(\Omega\)
B
122.5\(\Omega\)
C
245.0\(\Omega\)
D
39000.0\(\Omega\)
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
XL = 2\(\pi\)FL
= 2 x 3.142 x 30 x 10-3 x 1.3 x 103
= 245\(\Omega\)
Source: Myschool Past Questions Archive (Record #28019)
Physics
UTME / JAMB 1993
Atomic, Quantum, Nuclear Physics & Electronics
Solution
Which of the following statements correctly describe(s) cathode rays? i. they consist of tiny particles carrying negative electric charges. ii. they are deflected in a magnetic field but not in an electric field. iii. they consist of fast moving neutrons and deflected in an electric field.
A
i only
B
ii only
C
i and ii only
D
ii and iii only
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
properties of cathode rays among others are ;
The cathode rays consist of negatively charged particles known as electrons.
The cathode rays are deflected from their path by electric and magnetic fields.
Source: Myschool Past Questions Archive (Record #28022)
Physics
UTME / JAMB 1993
Atomic, Quantum, Nuclear Physics & Electronics
Natural radioactivity is the random spontaneous disintegration of the nuclei of heavy isotopes of certain elements with the emission of
A
\(\alpha\), X, and \( \beta\)
B
\(\alpha\), \(\beta\) and \(\gamma\)-rays
C
X, \(\alpha\), \(\gamma\)-ray
D
\(\alpha\), \( \beta\) and X-rays
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 #28025)
Physics
UTME / JAMB 1993
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following are produced after a nuclear fusion process? i. one heavy nucleus. ii. neutrons-1. iii. protons. iv. Energy.
A
i and ii
B
i and iv
C
ii and iii
D
ii and iv
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 #28026)
Physics
UTME / JAMB 1993
Atomic, Quantum, Nuclear Physics & Electronics
Solution
An element X of an atomic number 88 and mass number 226 decays to form an element Z by emitting two beta particles and an alpha particle. Z is represented by
A
\(^{222}_{82}Z\)
B
\(^{222}_{88}Z\)
C
\(^{226}_{86}Z\)
D
\(^{226}_{80}Z\)
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(^{226}_{88}X\) \(\to\) \((^{0}_{-1}e)\) + \(^{4}_{2}\alpha\) + \(^{b}_{a}X\)
a + 2 + (-2) = 88 a \(\Rightarrow\) a = 88
b + 4 + 0 = 266 b \(\Rightarrow\) b = 222
Source: Myschool Past Questions Archive (Record #28027)
English Language
UTME / JAMB 1993
Reading Comprehension, Summary & Composition
Solution
The statement, ‘The diseases afflicting Western societies have undergone dramatic change, implies that
A
Change have taken place in the mode of diseases affliction
B
Medical services have been important in changing life expectancy
C
A lot of significant progress has taken place in public health
D
Death from diseases in western societies are minimal
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
The passage states that in the past century, the types of diseases affecting Western societies have changed significantly. Mass killers (such as infectious diseases) have largely disappeared, and now, two-thirds of deaths are associated with diseases of old age. This suggests a shift in the nature of diseases affecting the population.
Source: Myschool Past Questions Archive (Record #15324)
English Language
UTME / JAMB 1993
Reading Comprehension, Summary & Composition
The writer is of the view that the diseases which prevail in the contemporary Western societies
A
Result from modern life styles
B
Are concentrated among the elderly
C
Kill many people at once
D
Are resistant to drug
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 #15325)
English Language
UTME / JAMB 1993
Reading Comprehension, Summary & Composition
The author thinks that the presence of a large number of doctors in a community
A
Does not have much effect on the control of diseases
B
Disguise the true fact about the diseases
C
Controls the spread of diseases
D
Improves the overall quality of life in the community
medium Difficulty
Verified Correct Answer: Option A
Grammar & Contextual Explanation
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #15326)
English Language
UTME / JAMB 1993
Reading Comprehension, Summary & Composition
Many doctors, according to the passage , choose to live where
A
Research facilities are available
B
They are most needed
C
They can be near colleagues
D
Conditions are more in their favour
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 #15327)