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Physics
UTME / JAMB 1991
Current Electricity & Electric Circuits
Solution
The electrochemical equivalent of platinum is 5.0 x 10-7kgC-1 to plate-out 1.0kg of platinum, a current of 100A must be passed through an appropriate vessel for
A
5.6 hours
B
56 hours
C
1.4 x 104 hours
D
2.0 x 104 hours
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
m = Itz
1 = 100 x 5 x 10-7 x t
t = 20,000sec
= 5.6hrs
Source: Myschool Past Questions Archive (Record #28203)
Physics
UTME / JAMB 1991
Calorimetry, Latent Heat & Change of State
Solution
which of the following statements are TRUE of isotopes? i. isotopes of an element have the same chemical properties because they have the same number of electrons. ii. isotopes of elements are normally separated using physical properties. iii. isotopes of an element have the same number of protons in their nuclei.
A
i and ii only
B
i and iii only
C
ii and iii only
D
i, ii, and iii
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Isotopes of an element have the same chemical properties because they have the same number of electrons (and the same electron configuration). Chemical behaviour is determined by the electrons, not the neutrons.
Isotopes are normally separated using physical properties (e.g., differences in mass, density, diffusion rate, or boiling point). Methods include gaseous diffusion, centrifugation, electromagnetic separation, or distillation. They cannot be easily separated by chemical methods because their chemical properties are almost identical. Isotopes of an element have the same number of protons in their nuclei (this is the definition — same atomic number, different mass numbers due to varying neutrons).
Source: Myschool Past Questions Archive (Record #28205)
English Language
UTME / JAMB 1991
Lexis, Structure & Register (Cloze & Vocabulary)
The changes that were made in the book were motivated by
A
professional experience and popularity of topics
B
teaching experience and statisticians view of some topics
C
the examination results of previous generation of students
D
the need to avoid areas which students grasp easily
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 #15296)
English Language
UTME / JAMB 1991
Reading Comprehension, Summary & Composition
It can be inferred from the passage that the book was written by
A
an educational psychologist
B
more than one author
C
a prominent statistcian
D
a professor of statistics
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 #15297)
Physics
UTME / JAMB 1991
Current Electricity & Electric Circuits
When an atom loses or gains a charge, it becomes
A
an electron
B
an ion
C
a neutron
D
a proton
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 #28206)
Physics
UTME / JAMB 1991
Atomic, Quantum, Nuclear Physics & Electronics
Solution
4g of a radioactive material of half-life 10 days is spilled on a laboratory floor. How long would it take to disintegrate 3.5g of the material?
A
1\(\frac{1}{4}\) days
B
8\(\frac{1}{4}\) days
C
30 days
D
80 days
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
half-life = 10 days
after 10 days, the 4g of element = 2g remaining with 2g disintegrated
after 10 days, 2g of element = 1g left with 1g disintegrated
hence, after 20 days, 3g of the element has been disintegrated with 1g left.
after 10 days, the 1g of element = 0.5g left with 0.5g disintegrated
after 30 days, we have 0.5g of element left with 3.5g disintegrated.
Source: Myschool Past Questions Archive (Record #28207)
Physics
UTME / JAMB 1991
Atomic, Quantum, Nuclear Physics & Electronics
Solution
In a nuclear fusion process, four protons each of mass Mp were fused to produce a nucleus X of mass Mx. Which of the following equations is CORRECT?
A
4Mp > Mx
B
4Mp = Mx
C
4Mp x
D
Mp > Mx
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Energy is given out
Source: Myschool Past Questions Archive (Record #28208)
Physics
UTME / JAMB 1991
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following are True for \(\alpha\)-decay. i. mass number, decrease by four. ii. Atomic number decreases by two. iii. mass number does not change.
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 #28209)
Physics
UTME / JAMB 1991
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following phenomena is called photoelectric effect?
A
high energy electrons impinge on a metalic anode which then emits photons
B
a high energy photon emits photons as it slowed down
C
a metal absorbs quanta of light and then emits electrons
D
Two electrons are created from a quantum of 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 #28210)
English Language
UTME / JAMB 1991
Prepositions, Phrasal Verbs & Collocations
Which of the following titles best sums up the passage?
A
The need for effective communication
B
Break down in communication
C
communication in technological societies
D
Bad communication practices
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 #15301)
English Language
UTME / JAMB 1991
Reading Comprehension, Summary & Composition
Solution
According to the passage, which of the following are NOT likely to contribute to a break down in communication?
A
people's attitude and feeling
B
Ambiguously phrased instruction
C
Managements and trade unions
D
Management specialists and behavioural scientists
medium Difficulty
Verified Correct Answer: Option D
Grammar & Contextual Explanation
The passage clearly states that:
“management specialists and behavioural scientists have devoted much thought and energy… to analyzing the problems caused by bad communication practices and creating good communication climate and systems.”
This means they are trying to solve communication problems, not cause them. So they are NOT likely to contribute to a breakdown in communication.
Source: Myschool Past Questions Archive (Record #15305)
English Language
UTME / JAMB 1991
Lexis, Structure & Register (Cloze & Vocabulary)
From the text, it can be inferred that a good communicator needs to
A
Create favourable communication conditions
B
Get the technological systems to work effeciently
C
Call a spade a spade
D
Be able to address 10,000 workers
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 #15306)
English Language
UTME / JAMB 1991
Reading Comprehension, Summary & Composition
'Chasm' as used in the passage means
A
Serious eruption
B
Disaster
C
Wide difference
D
Disagreement
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 #15307)
English Language
UTME / JAMB 1991
Lexis, Structure & Register (Cloze & Vocabulary)
Solution
The most essential tool of communication not specifically mentioned in this passage is
A
Specificialization
B
Environment
C
Writing
D
Language
medium Difficulty
Verified Correct Answer: Option C
Grammar & Contextual Explanation
While the passage talks about communication issues, the specific mention of writing is missing. However, writing is a crucial aspect of communication, especially in modern organizations where written communication through emails, reports, memos, and other documents plays a significant role.
Source: Myschool Past Questions Archive (Record #15309)
Physics
UTME / JAMB 1991
Current Electricity & Electric Circuits
Solution
In the above circuit, The fuse wire melts when
A
K is Opened
B
K is closed
C
the 14 ohm resistor is doubled with k closed
D
the 6 ohm resistor is doubled with k closed
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
K is closed: This is when the current exceeds the 2 A rating of the fuse, causing it to melt.
Source: Official Exam / Past Question Archive