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Chemistry
UTME / JAMB 2021
Metals and Their Compounds
Solution
The only metal that is anti-bacterial is?
A
Iron
B
Sodium
C
Alluminium
D
Copper
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Aluminium sulfate is a salt soluble in water and is mainly used as a coagulating agent in the purification of drinking water.
Copper demonstrated the greatest antimicrobial activity. The silver coatings demonstrated the second most antimicrobial surface.
Source: WAEC / JAMB / NECO Classroom Archive (Record #60513)
Chemistry
UTME / JAMB 2021
Metals and Their Compounds
Solution
The process or act of extracting a metal from its ore and refining it is called?
A
Extraction
B
Metal mining
C
Mettallurgy
D
Prospecting
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
metallurgy, art and science of extracting metals from their ores and modifying the metals for use.
Source: WAEC / JAMB / NECO Classroom Archive (Record #60522)
Chemistry
UTME / JAMB 2021
Transition Metals and Their Compounds
Solution
What is the chemical name for the compound CuCO\(_{3}\)?
A
Copper (iii) carbonate
B
Copper (ii) carbonate
C
Copper (i) carbonate
D
Copper
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Copper(II) carbonate or cupric carbonate is a chemical compound with formula CuC\(O_3\)
Source: WAEC / JAMB / NECO Classroom Archive (Record #60419)
Chemistry
UTME / JAMB 2021
Organic Chemistry
Solution
Give the common name for the following compound (CH\(_{3}\))\(_{2}\) CH CH\(_{2}\) -Br
A
Isobutyl bromide
B
Methyl bromide
C
propyl bromide
D
Butyl bromide
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
Common name : Isobutyl bromide
IUPAC name : 1-Bromo-2-methylpropane
Boiling point : 102^\circC
Formula : C\(_4\)H\(_9\)Br
Source: WAEC / JAMB / NECO Classroom Archive (Record #60406)
Chemistry
UTME / JAMB 2021
Organic Chemistry
Solution
The enzyme that converts glucose to ethyl alcohol is?
A
maltase
B
zymase
C
Diatase
D
Invertase
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Zymase is an enzyme complex that catalyzes the fermentation of sugar into ethanol and carbon dioxide. It occurs naturally in yeasts.
Source: WAEC / JAMB / NECO Classroom Archive (Record #60409)
Chemistry
UTME / JAMB 2021
Organic Chemistry
Solution
What is the IUPAC name for the following compound? HC\(\equiv\)CCH\(_{3}\)
A
Acetylene
B
Methyl acetylene
C
Butanol
D
Decanoic acid
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Propyne (methylacetylene) is an alkyne with the chemical formula HC\(\equiv\)CC\(H_3\)
Source: WAEC / JAMB / NECO Classroom Archive (Record #60414)
Chemistry
UTME / JAMB 2021
Hydrocarbons
Solution
The compounds made up of only carbon and hydrogen are called?
A
Carbon compounds
B
Hydrocarbons
C
Atoms
D
Carbon hydrolysis
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
A hydrocarbon is any of a class of organic chemicals made up of only the elements carbon (C) and hydrogen (H).
Classes are Aliphatic and Aromatic Hydrocarbons.
Natural sources are coal, natural gas and petroleum.
Source: WAEC / JAMB / NECO Classroom Archive (Record #60524)
Chemistry
UTME / JAMB 2021
Organic Chemistry
Solution
Soaps clean surfaces on the principle based on?
A
viscosity
B
floatation
C
elasticity
D
surface tension
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Since the surface tension forces become smaller as the distance between water molecules increases, the intervening soap molecules decrease the surface tension.
Source: WAEC / JAMB / NECO Classroom Archive (Record #60475)
Chemistry
UTME / JAMB 2021
Organic Chemistry
Solution
One of the following is not a physical property of monosaccharides?
A
Monosaccharides get charred when heated
B
Monosaccharides are water-soluble, sweet substances
C
They are highly vital to the exploration of metals
D
They can be reduced to sugar alcohols
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
- Monosaccharides are reducing sugars.
- Pure monosaccharides are water-soluble, white, crystaline solids.
- They taste sweet
- Form a black residue of carbon when dehydrated
Source: WAEC / JAMB / NECO Classroom Archive (Record #60528)
Physics
UTME / JAMB 2021
Mechanics and Properties of Matter
Solution
Which of the units of the following physical quantities are derived?
I. Area
II. Thrust
III. Pressure
IV. Mass
A
I, II, III and IV
B
I, II, and III only
C
I, II, and IV only
D
I and IV only
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Only 'mass' is a fundamental quantity
Source: Myschool Past Questions Archive (Record #60566)
Physics
UTME / JAMB 2021
Waves and Optics
Solution
In a series R-L-C circuit at resonance, the voltages across the resistor and the inductors are 30V and 40V respectively. What is the voltage across the capacitor?
A
30V
B
40V
C
50V
D
70V
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
AT resonance; \(X_L\) = \(X_c\)
\(\therefore\) = \(V_L\) = \(V_c\) = 40V
Source: Myschool Past Questions Archive (Record #60741)
Physics
UTME / JAMB 2021
Modern Physics and Nuclear Physics
Solution
If the fraction of the atoms of a radioactive material left after 120 years is 1/64, what is the half-life of the material?
A
24 years
B
20 years
C
10 years
D
2 years
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Given amount remaining = \(\frac{1}{64}\)
= \(\frac{1}{64} = \frac{1}{(2)^{6}}\)
\(\therefore\) = \(\frac{120 \text {years}}{6}\) = 20 years
\(\Rightarrow\) T\(\frac{1}{2}\) = 20 years
Source: Myschool Past Questions Archive (Record #60747)
Physics
UTME / JAMB 2021
Heat Energy & Temperature
Solution
The inner diameter of a test tube can be measured accurately using a?
A
micrometer screw gauge
B
pair of dividers
C
meter rule
D
pair of vernier calipers
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Vernier calipers are also used to measure the internal and external diameters of a tube
Source: Myschool Past Questions Archive (Record #60750)
Physics
UTME / JAMB 2021
Mechanics and Properties of Matter
Solution
A car of mass 800kg attains a speed of 25m/s in 20secs. The power developed in the engine is?
A
1.25 x 10\(^{4}\)W
B
2.50x 10\(^{4}\)W
C
1.25 x 10\(^{6}\)W
D
2.50 x 10\(^{6}\)W
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
- Acceleration, a = \(\frac{\text{v}}{\text{t}}\) = \(\frac{25}{20}\) = 1.25ms\(^{-2}\)
- Force, F = ma = 800 x 1.25 = 1,000N
- Average power = Force \times average velocity = 1000 \(\times \frac{0 + 25}{2}\) = 12,500W = 1.25 x 10\(^4\) W
Source: Myschool Past Questions Archive (Record #60756)
Physics
UTME / JAMB 2021
Heat Energy & Temperature
Solution
A 2H inductor has negligible resistance and is connected to a \(\frac{50}{\pi}\) Hz A.C supply. The reactance of the inductor is?
A
200\(\Omega\)
B
50\(\Omega\)
C
\(\frac{100}{\pi}\)
D
\(\frac{25}{\pi \Omega}\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Given;
L = 2H
F = \(\frac{50}{\pi}\) \(H_2\)
\(X_L\) = ?
\(X_L\) = 2\(\pi\)fL = 2\(\pi\) x \(\frac{50}{\lambda}\) x 2
= 200\(\Omega\)
Source: Official Exam / Past Question Archive