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Physics
UTME / JAMB 2025
Electricity and Magnetism
Solution
The emf of a cell is the potential difference across its terminals when it is in
A
series connection
B
closed circuit
C
open circuit
D
parallel connection
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Answer: C.
open circuit (EMF is maximum PD with no current drawn.
Source: Myschool Past Questions Archive (Record #74354)
Physics
UTME / JAMB 2025
Thermal Physics
Solution
The thermometric property of mercury is best on the change in
A
density with temperature
B
volume with temperature
C
pressure with temperature
D
resistance with temperature
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Answer: B.
volume with temperature (Mercury thermometers rely on thermal expansion of volume.)
Source: Myschool Past Questions Archive (Record #74355)
Physics
UTME / JAMB 2025
Waves and Optics
Solution
Some of the features of the human eye that greatly help to refract light entering the eyes are
A
cornea and lens
B
cornea and aqueous humor
C
lens and vitreous humor
D
aqueous humor and lens
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Answer: A.
cornea and lens (Main refractive structures.)
Source: Myschool Past Questions Archive (Record #74356)
Physics
UTME / JAMB 2025
Heat Energy & Temperature
Solution
The gravitational pull between two bodies is 20N. Find the gravitational pull when their distance of separation is doubled.
A
10N
B
5N
C
13N
D
20N
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Answer: B. 5N
(F ∝ \(\frac{1}{r^2}\);
doubled r → \(\frac{\text{F}}{4}\) = \(\frac{20}{4}\) = 5 N.)
Source: Myschool Past Questions Archive (Record #74363)
Physics
UTME / JAMB 2025
Thermal Physics
Solution
The volume of a 1 cm\(^3\) metal ball increases by 0.0018 cm\(^3\) when heated through temperature \theta. If the linear expansivity of the ball is 2.0 x 10\(^{-5} K^{-1}\), find \theta.
A
20°C
B
50°C
C
30°C
D
25°C
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Answer: C. 30^\circC
(Volume exp. γ = 3 \alpha = 6\times10\(^{-5}\)K\(^{-1}\);
\DeltaV = V γ \theta;
\theta = \(\frac{0.0018}{1 \times 6\times 10^{-5}}\) = 30^\circC.
Source: Myschool Past Questions Archive (Record #74364)
Physics
UTME / JAMB 2025
Mechanics and Properties of Matter
Solution
For a gas, which pair of variables is inversely proportional to each other (provided other conditions are constant), where P = pressure, T= temperature, V= volume, and n= number of molecules?
A
P, T
B
P, V
C
n, P
D
V, T
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Answer: B. P, V
(Boyle's law: P ∝ \(\frac{1}{\text{V}}\) at constant T, n.)
Source: Myschool Past Questions Archive (Record #74365)
Physics
UTME / JAMB 2025
Mechanics and Properties of Matter
Solution
A boy uses a single string pulley system to lift a mass of 20kg moving with a velocity of 5ms\(^{-1}\). What is the power developed by the boy if g = 10ms\(^{-2}\)?
A
100W
B
1000W
C
250W
D
40W
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Answer: B. 1000W
(Fixed pulley: force = mg = 200 N; power = F \times v = 200 \times 5 = 1000 W.)
Source: Myschool Past Questions Archive (Record #74366)
Physics
UTME / JAMB 2025
Heat Energy & Temperature
Solution
When both the object and its image move together in the same direction relative to the observer, then there is
A
no parallax error
B
blurred image
C
mechanical error
D
parallax error
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Answer: A. no parallax error (No apparent shift if moving together.)
Source: Myschool Past Questions Archive (Record #74357)
Physics
UTME / JAMB 2025
Mechanics and Properties of Matter
Diagram
Solution
The diagram above shows a magnetic field due to a
Attached Figure / Diagram
A
solenoid
B
circular coil
C
current-carrying straight conductor
D
the earth's meridian
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Answer: C. current carrying straight conductor (Concentric circles typical of straight wire magnetic field.)
(Diagram: concentric circular field lines around a central point on a vertical line, arrows clockwise, indicating field around a wire.)
Source: Myschool Past Questions Archive (Record #74358)
Physics
UTME / JAMB 2025
Thermal Physics
Solution
Without considering the containing vessel, what mass of boiled water can raise the temperature of 8 kg of water from 25^\circC to 60^\circC when mixed in a heat-proof container?
A
10kg
B
7kg
C
5kg
D
6kg
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Answer: B. 7kg
(Heat balance: m \times 4200 \times (100 - 60) = 8 \times 4200 \times (60-25);
m = \(\frac{(8 \times 35)}{40}\) = 7 kg.)
Source: Myschool Past Questions Archive (Record #74367)
Physics
UTME / JAMB 2025
Heat Energy & Temperature
Solution
Which of the following has the least thermal conductivity?
A
air
B
ash
C
glass
D
water
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Answer: A. air
(Air is a poor conductor ~0.025 W/mK; water ~0.6, glass ~1, ash varies but is higher.)
Air is a poor conductor of heat compared to solids and liquids like ash, glass, and water, making it a good insulator.
Source: Myschool Past Questions Archive (Record #74368)
Physics
UTME / JAMB 2025
Mechanics and Properties of Matter
Solution
What form of energy is present in the food we eat?
A
Kinetic
B
Mechanical
C
Potential
D
Chemical
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Answer: D
Food stores energy in chemical bonds, released during metabolism.
Source: Myschool Past Questions Archive (Record #74378)
Physics
UTME / JAMB 2025
Mechanics and Properties of Matter
Solution
What magnitude of electric current can store 2.5 J of energy in a 3 H induction coil?
A
1.29 A
B
2.48 A
C
5.00 A
D
3.66 A
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Answer: A
Energy in an inductor: E = \(\frac{1}{2}\)LI\(^2\) ⇒ I ≈ 1.29 A.
Source: Myschool Past Questions Archive (Record #74379)
Physics
UTME / JAMB 2025
Mechanics and Properties of Matter
Solution
A machine has an efficiency of 80%. If the input work is 200J, the output work is?
A
250J
B
160J
C
120J
D
100J
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\text{Efficiency} = \frac{\text{Output Work}}{\text{Input Work}}\)
Given: \(\text{Efficiency} = 80\% = 0.8\), \(\text{Input Work} = 200 \text{ J}\)
Then, the output work is calculated as follows:
\(\text{Output Work} = 0.8 \times 200 = 160 \, \text{J}\)
Thus, the output work is: \(\text{Output Work} = 160 \, \text{J}\).
Source: Myschool Past Questions Archive (Record #74380)
Physics
UTME / JAMB 2025
Waves and Optics
Solution
Lining the walls of an auditorium with perforated materials reduces
A
reverberation
B
diffraction
C
refraction
D
auditorium pulse
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Answer: A
Perforated materials absorb sound, reducing reverberation.
Source: Myschool Past Questions Archive (Record #74382)