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 11566–11580 of 14893 verified questions
Sort by:
Physics
UTME / JAMB 1989
Calorimetry, Latent Heat & Change of State
The function of a 5-A fuse included in a circuit supplying a household refrigerator with power is to keep the
A
Temperature of the refrigerator low and constant
B
keep current supplied to the refrigerator below 5A
C
Voltage supply constant
D
Current supplies to the refrigeration
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 #41560)
Physics
UTME / JAMB 1989
Equilibrium of Forces, Moments & Flotation
Diagram
The fig above shows a uniform circular object, center R and diameter PS. A circular section 6 and Diameter PR is cut from it. if PQRS is a straight line, where is center of gravity of the figure
Attached Figure / Diagram
A
Q
B
R
C
A point between P and R
D
A point between R and S
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 #41680)
Physics
UTME / JAMB 1989
Work, Energy, Power & Simple Machines
Diagram
A simple pendulum of mass m moves along an arc pf a circle radius R in a vertical plane as shown above. What is the work done by gravity in a downward swing through the angle q to 0 degree
Attached Figure / Diagram
A
mgR sinθ
B
MgR (1- cos θ)
C
mgR
D
mgR (1 - sinθ)
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 #41682)
Physics
UTME / JAMB 1989
Newton's Laws, Momentum & Collisions
Diagram
Solution
A block of mass m is held in equilibrium against a vertical wall by a horizontal force. If the coefficient of friction between the wall and the block is µ, the minimum value of the horizontal force is
Attached Figure / Diagram
A
µmg
B
(1-µ)mg
C
(1+µ)mg
D
mg/µ
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
To keep the block of mass m in equilibrium against a vertical wall using a horizontal force F:
The normal reaction N = F
The frictional force f must balance the weight: f = mg
Maximum friction available: f = \muN = \muF
For the minimum horizontal force:
\muF = mg
F = mg / \mu
Source: Myschool Past Questions Archive (Record #41683)
Physics
UTME / JAMB 1989
Elasticity, Density, Pressure & Fluids
Diagram
Solution
In the fig above W\(_1\) = 200g, and W\(_2\) =450g. Calculate the extension of the spring per unit load.
[g = 10ms\(^{-2}\)]
Attached Figure / Diagram
A
6.0 x 10-5mN-1
B
2.5 x 10-4mN-1
C
6.0 x 10 -3mN-1
D
2.5 x 10 -2mN-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
From the diagram given in the question
Change in length = (6.5 - 5.0) x 10\(^{-2}\)m
Change in force(wg) = (420 - 200) x 10 x 10\(^{-3}\) = 2.5N ( g changed to kg)
extension per unit x = \(\frac{\Delta l}{\Delta F}\) = \(\frac{1.5 \times 10^{-2}}{2.5}\) = 6.0 x 10\(^{-3}\)
Source: Myschool Past Questions Archive (Record #41684)
Physics
UTME / JAMB 1989
Waves, Sound & Vibrations
Diagram
Solution
The air column as shown above is set into vibration by the turning fork. In this State of resonance, the waves in the air column will be
Attached Figure / Diagram
A
stationary and transverse
B
stationary and longitudinal
C
progressive and transverse
D
progressive and longitudinal
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
In solids, sound can exist as either a longitudinal or a transverse wave. But in mediums which are fluid (e.g., gases and liquids), sound waves can only be longitudinal. For Longitudinal Waves, the displacement of the medium is parallel to the direction of propagation of the wave.
Source: Myschool Past Questions Archive (Record #41685)
Physics
UTME / JAMB 1989
Current Electricity & Electric Circuits
Diagram
In the above circuit diagrams A is the ammeter and V is the Voltmeter. Which of the circuits is correct for finding the correct value of the resistance R
Attached Figure / Diagram
A
I
B
II
C
III
D
IV
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 #41686)
Physics
UTME / JAMB 1989
Electrostatics & Capacitors
Diagram
Solution
Three 2-µF capacitors are arranged as seen in the circuit above . The effective capacitance between E and F is
Attached Figure / Diagram
A
0.75µF
B
1.33µF
C
3.00µF
D
6.00µF
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(C_T = \frac{2 \times (2 + 2)}{2 + (2 + 2)}\)
= \(\frac{8}{6}\)
= 1.33 \(\mu\)F
Source: Myschool Past Questions Archive (Record #41687)
Physics
UTME / JAMB 1989
Magnetism, Electromagnetism & AC Circuits
Diagram
The fig above shows a conductor PQ carrying a current I in the direction shown. At a particular position near the conductor is a compass needle K. Neglecting the earth's magnetic field, the compass needle will
Attached Figure / Diagram
A
settle in any direction
B
settle in a fixed direction only if the conductor PQ is a magnetic material
C
settle in a fixed direction WHETHER the conductor PQ is a magnetic material OR NOT
D
be stationary
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 #41689)
Physics
UTME / JAMB 1989
Atomic, Quantum, Nuclear Physics & Electronics
Diagram
Solution
A beam of radiation is passed between a pair of charged plates as indicated in the fig above. Beam P is undetected While Q is deflected to the left. P and Q respectively should be
I.γ-rays \beta-rays
II. x-rays \beta-rays
III. γ-rays x-rays
IV. x-rays x-rays
Attached Figure / Diagram
A
I only
B
III only
C
I and II
D
III and IV
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
studying the charges of the Gamma, Alpha, Beta and X-rays, you find that both the x-rays and theGamma rays possess zero-charge hence they could pass the charged plate undetected while the beta rays are negatively charged hence will deflect towards the positive charge of the plate. Alpha rays, on the other hand, are poisitively charged hence, they deflect towards the negative charge.
Source: Myschool Past Questions Archive (Record #41690)
Chemistry
UTME / JAMB 1989
Stoichiometry, Mole Concept & Volumetric Analysis
Which of the following would support the conclusion that a solid sample is a mixture?
A
the solid can be ground to a fine powder
B
the density of the solid is 2.25 g dm3
C
the solid has a melting range of 300oC to 375oC
D
the solid absorbs moisture from the atmosphere
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 #27556)
Chemistry
UTME / JAMB 1989
Stoichiometry, Mole Concept & Volumetric Analysis
The molar ratio of carbon to hydrogen of a volatile liquid compound is 1: 2. 0. 12 g of the liquid on evaporation at s.t.p. gave 32 cm3 of vapour. The molecular formula of the liquid is
[G.M.V =22.4 dm 3, C = 12, H = 1]
A
C 3 H 6
B
C 4H 8
C
C 5C 10
D
C 6H 12
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 #27557)
Chemistry
UTME / JAMB 1989
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
20.00 cm\(^3\) of a solution containing 0.53 g of anhydrous Na\(_2\)CO\(_3\) in 100 cm\(^3\) requires 25.00 cm\(^3\) of H\(_2\)SO\(_4\) for complete neutralisation. The concentration of the acid solution in moles per dm\(^3\) is [H =1, C = 12, O = 16, Na =23, S = 32]
A
0.02
B
0.04
C
0.06
D
0.08
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
First, we need to write a balanced equation for the chemical reaction:
H\(_2\)SO\(_4\) + Na\(_2\)CO\(_3\) → Na\(_2\)SO\(_4\) + H\(_2\)O + CO\(_2\)
Stoichiometrically, N\(_A\) = 1 , N\(_B\) = 1
Given:
V\(_B\) = 20cm\(^3\), V\(_A\) = 25cm\(^3\), C\(_A\) = ?
C\(_B\) = 0.53 g is dissolved in 100 cm\(^3\) of water
then Xg will be dissolved in 1000 cm\(^3\) of water (i.e 1dm\(^3\) = 1 Litre of water)
Xg = \(\frac{{0.53}\times{1000}}{100}\)
Xg = 5.3gdm\(^{-3}\) → This is the concentration of B in gdm\(^{-3}\). Hence we must have to convert it to moldm\(^{-3}\) before calculating the concentration of the acid.
To convert to molar concentration, we use the relationship;
Molar concentration (moldm\(^{-3}\)) = \(\frac{Mass concentration (gdm^{-3}}{Molar mass}\)
But Molar mass of Na\(_2\)CO\(_3\) = (23 x 2) + 12 + (16 x 3) = 106g/mol
Molar concentration (moldm\(^{-3}\)) = \(\frac{5.3}{106}\)
C\(_B\) = 0.05 moldm\(^{-3}\)
Using \(\frac{{C_A}{V_A}}{{C_B}{V_B}}\) = \(\frac{N_A}{N_B}\)
\(\frac{C_A}{V_A}{N_B}\)= \(\frac{C_B}{V_B}{N_A}\)
C\(_A\) = \(\frac{{C_B}{V_B}{N_A}}{{V_A}{N_B}}\)
C\(_A\) = \(\frac{{0.05}\times{20}\times{1}}{{25}\times{1}}\)
C\(_A\) = 0.04 moldm\(^{-3}\)
Source: Myschool Past Questions Archive (Record #27558)
Chemistry
UTME / JAMB 1989
Stoichiometry, Mole Concept & Volumetric Analysis
The minimum volume of oxygen required for the complete combustion of a mixture of 10cm 3 of CO and 15 cm 3 of H 2 is
A
25.0cm3
B
12.5 cm3
C
10.0 cm3
D
5.0cm3
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 #27559)
Chemistry
UTME / JAMB 1989
Kinetic Theory of Matter & Gas Laws
What is the partial pressure of hydrogen gas collected
over water at standard atmospheric pressure and 25 oC if the saturation vapour pressure of water at saturation vapour pressure of water is 23 mm Hg at that temperature?
A
737 mm Hg
B
763 mm Hg
C
777 mm Hg
D
783 mm Hg
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 #27560)