Question Library
Browse, filter, and study verified past examination questions with step-by-step mathematical reasoning.
Searching 18,000+ Questions...
Sifting topics, KaTeX formulas & verified solutions
Showing 3346–3360 of 14893 verified questions
Sort by:
Physics
UTME / JAMB 2018
Reflection, Refraction & Dispersion of Light
Solution
The critical angle for light traveling from a transparent medium to air s measured as 34º. The refractive index of the medium is
A
0.56
B
1.50
C
1.79
D
2.02
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
N = \(\frac{1}{sin\theta}\)
= \(\frac{1}{sin34}\)
= 1.79
Source: Myschool Past Questions Archive (Record #47769)
Physics
UTME / JAMB 2018
Reflection, Refraction & Dispersion of Light
Solution
The critical angle for light traveling from a transparent medium to air s measured as 34º. The refractive index of the medium is
A
0.56
B
1.50
C
1.79
D
2.02
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
N = \(\frac{1}{sin\theta}\)
= \(\frac{1}{sin34}\)
= 1.79
Source: Official Exam / Past Question Archive
Chemistry
UTME / JAMB 2018
Kinetic Theory of Matter & Gas Laws
According to Charles' law, the volume of a gas becomes zero at
A
0°C
B
-100°C
C
-273°C
D
-373°C
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #47285)
Chemistry
UTME / JAMB 2018
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
A substance that is used as a ripening agent for fruits is
A
ethene
B
propane
C
methane
D
butane
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #47286)
Chemistry
UTME / JAMB 2018
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
The Sulphide which is insoluble in dilute hydrochloric acid is
A
FeS
B
CuS
C
ZnS
D
Na2S
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Sulphides like PbS (lead (II) sulphide) and CuS (copper (II) sulphide) are insoluble in acidified solutions.
Source: Myschool Past Questions Archive (Record #47287)
Chemistry
UTME / JAMB 2018
Stoichiometry, Mole Concept & Volumetric Analysis
An element used in the production of matches is
A
nitrogen
B
aluminium
C
copper
D
sulphur
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #47294)
Chemistry
UTME / JAMB 2018
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following gases may not be dried with concentrated sulphuric acid?
A
HCl\(_{(g)}\)
B
NH\(_3\)
C
Cl\(_2\)
D
SO\(_2\)
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #47296)
Chemistry
UTME / JAMB 2018
Organic Chemistry I: Hydrocarbons & Crude Oil
The Consecutive members of an alkane homologous series differ by
A
CH
B
CH\(_2\)
C
CH\(_3\)
D
C\(_n\)H\(_n\)
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #47314)
Chemistry
UTME / JAMB 2018
Electrolysis & Electrochemical Cells
A correct electrochemical series can be obtained from Na, Ca, Al, Mg, Zn, Fe, Pb, H, Cu, Hg, Ag, Au by interchanging
A
Al and Mg
B
Zn and Fe
C
Zn and Pb
D
Pb and H
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #47316)
Chemistry
UTME / JAMB 2018
Kinetic Theory of Matter & Gas Laws
Solution
A basic postulate of the kinetic theory of gases is that the molecules of a gas move in straight lines between collisions. This implies that
A
collisions are perfectly elastic
B
forces of repulsion exist
C
forces of repulsion and attraction are in equilibrium
D
collisions are inelastic
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
According to one of the kinetic theories of gases, When collisions occur, the molecules lose no kinetic energy; that is, the collisions are said to be perfectly elastic.
Source: Myschool Past Questions Archive (Record #47317)
Chemistry
UTME / JAMB 2018
Acids, Bases, pH & Salts
What is the PH of 0.00 1 moldm\(^3\) solution of the sodium hydroxide
A
14
B
13
C
12
D
11
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #47288)
Chemistry
UTME / JAMB 2018
Chemical Bonding & Intermolecular Forces
The type of bonding in [Cu(NH\(_3\))\(^4\)]\(^{2+}\) is
A
coordinate
B
electrovalent
C
metallic
D
covalent
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #47289)
Chemistry
UTME / JAMB 2018
Nature of Matter & Separation Techniques
Which of the following is an example of a chemical change?
A
dissolution of salt in water
B
rusting of iron
C
melting of ice
D
separating a mixture by distillation
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #47290)
Chemistry
UTME / JAMB 2018
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
To what temperature must a gas at 273k be heated in order to double both its volume and pressure?
A
298K
B
546K
C
819K
D
1092K
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Given:
T\(_1\) = 273K ; V\(_1\) = X ; P\(_1\) = Y
T\(_2\) = ? ; V\(_2\) = 2X P\(_2\) = 2Y ( Remember we were told the volume and pressure were doubled )
We also represented V\(_1\) and P\(_1\) to be X and Y respective,y since we were not given.
Using the formula: \(\frac{{P_1}{V_1}}{T_1}\) = \(\frac{{P_2}{V_2}}{T_2}\)
T\(_2\) = \(\frac{{P_2}{V_2}{T_1}}{{P_1}{V_1}}\)
= \(\frac{{2Y}\times{2X}\times{273}}{{Y}\times{X}}\)
= 2 x 2 x 273
= 1092 K
Source: Myschool Past Questions Archive (Record #47291)
Chemistry
UTME / JAMB 2018
Kinetic Theory of Matter & Gas Laws
Solution
According to the Kinetic Theory an increase in temperature causes the kinetic energy of particles to
A
decrease
B
increase
C
be zero
D
remain constant
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
According to the kinetic theory of gases, when a substance is heated, the average kinetic energy of its molecules increases and this leads to a rise in temperature.
Source: Myschool Past Questions Archive (Record #47292)