POST UTME UNILAG 2025 Physics | Objective

Are you preparing for POST UTME UNILAG exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2025 Physics (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
A 2 kg block of ice at 0°C is placed in a 10°C water bath. Assuming no heat loss to the surroundings, calculate the time it takes for the ice to melt completely.
A. 10 minutes
B. 20 minutes
Correct C. 30 minutes
D. 40 minutes

Correct Answer: C

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Question 2
A 5 μF capacitor is connected in series with a 10 kΩ resistor and a 9 V battery. Calculate the time cons\tant of the circuit.
A. 50 ms
Correct B. 100 ms
C. 200 ms
D. 500 ms

Correct Answer: B

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Question 3
A particle of mass 2 kg is moving in a circular path of radius 3 m with a speed of 4 m/s. Calculate the centripetal force acting on the particle.
A. 10 N
B. 20 N
Correct C. 30 N
D. 40 N

Correct Answer: C

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Question 4
A 10 Ω resistor is connected in parallel with a 20 Ω resistor. Calculate the equivalent resis\tance of the circuit.
A. 5 Ω
B. 10 Ω
Correct C. 15 Ω
D. 20 Ω

Correct Answer: C

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Question 5
A 5 kg block is moving with a velocity of 2 m/s. Calculate the kinetic energy of the block.
A. 10 J
B. 20 J
Correct C. 30 J
D. 40 J

Correct Answer: C

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Question 6
A uniform magnetic field of 2 T is applied to a coil of wire with 100 turns. If the coil has an area of 0.1 m^2, what is the magnitude of the magnetic flux through the coil?
A. 0.2 Wb
Correct B. 0.4 Wb
C. 0.6 Wb
D. 0.8 Wb

Correct Answer: B

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Question 7
A block of wood with a density of 500 kg/m^3 is submerged in water. If the block has a volume of 0.05 m^3, what is the buoyant force acting on the block?
A. 25 N
Correct B. 50 N
C. 75 N
D. 100 N

Correct Answer: B

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Question 8
A 10 V AC source is connected to a 20 Ω resistor. If the frequency of the AC source is 50 Hz, what is the rms current flowing through the resistor?
A. 0.5 A
Correct B. 1 A
C. 1.5 A
D. 2 A

Correct Answer: B

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Question 9
A radioactive sample has a half-life of 10 years. If the initial activity of the sample is 100 Bq, what is the activity of the sample after 20 years?
A. 12.5 Bq
Correct B. 25 Bq
C. 50 Bq
D. 100 Bq

Correct Answer: B

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Question 10
A 2 kg block is attached to a horizontal spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.1 m from its equilibrium position, what is the magnitude of the force exerted by the spring on the block?
A. 10 N
Correct B. 20 N
C. 30 N
D. 40 N

Correct Answer: B

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Question 11
A particle of mass 2 kg is moving in a circular path of radius 3 m with a cons\tant speed of 4 m/s. If the particle is subject to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?
A. 2 m/s^2
B. 4 m/s^2
Correct C. 6 m/s^2
D. 8 m/s^2

Correct Answer: C

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Question 12
A 5 μF capacitor is connected in series with a 10 kΩ resistor and a 20 V battery. What is the time cons\tant of the circuit?
A. 0.1 s
Correct B. 0.2 s
C. 0.5 s
D. 1 s

Correct Answer: B

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Question 13
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. What is the maximum height reached by the projectile?
A. 10 m
B. 15 m
Correct C. 20 m
D. 25 m

Correct Answer: C

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Question 14
A gas is compressed from an initial volume of 2 L to a final volume of 1 L at a cons\tant temperature of 300 K. What is the work done on the gas?
A. -1 J
Correct B. -2 J
C. -3 J
D. -4 J

Correct Answer: B

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Question 15
A spring with a spring cons\tant of 100 N/m is stretched by 2 m from its equilibrium position. What is the potential energy stored in the spring?
A. 100 J
B. 200 J
Correct C. 300 J
D. 400 J

Correct Answer: C

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Question 16
A particle of mass 2 kg is attached to a spring with spring cons\tant 100 N/m. It is displaced by 0.5 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the kinetic energy of the particle at time t = 0.2 s.
A. 0.5 J
Correct B. 1.0 J
C. 1.5 J
D. 2.0 J

Correct Answer: B

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Question 17
A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -30 cm. A parallel beam of light is incident on the combination. Determine the nature and focal length of the resulting lens.
Correct A. Convex, 40 cm
B. Concave, -20 cm
C. Convex, 10 cm
D. Concave, 30 cm

Correct Answer: A

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Question 18
A photon of energy 2.5 eV is incident on a metal surface with work function 1.8 eV. Determine the maximum kinetic energy of the photoelectron.
A. 0.1 eV
B. 0.2 eV
Correct C. 0.3 eV
D. 0.4 eV

Correct Answer: C

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Question 19
A particle of mass 1 kg is moving in a circular path of radius 2 m with a speed of 4 m/s. Determine the centripetal acceleration of the particle.
A. 2 m/s^2
Correct B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2

Correct Answer: B

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Question 20
A wave of wavelength 0.5 m and frequency 10 Hz is propagating in a medium with speed 20 m/s. Determine the amplitude of the wave.
A. 0.1 m
B. 0.2 m
Correct C. 0.3 m
D. 0.4 m

Correct Answer: C

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Question 21
A parallel-plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 12 V. If the dis\tance between the plates is doubled, what is the new capaci\tance?
A. 20 μF
Correct B. 15 μF
C. 10 μF
D. 5 μF

Correct Answer: B

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Question 22
A particle of mass 2 kg is moving in a circular path of radius 3 m with a speed of 4 m/s. What is the magnitude of the centripetal force acting on the particle?
A. 8 N
B. 12 N
Correct C. 16 N
D. 20 N

Correct Answer: C

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Question 23
A radioactive sample has an initial activity of 100 Bq. After 2 hours, the activity decreases to 50 Bq. What is the half-life of the sample?
A. 1 hour
Correct B. 2 hours
C. 4 hours
D. 6 hours

Correct Answer: B

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Question 24
A convex lens has a focal length of 20 cm. An object is placed 30 cm in front of the lens. What is the magnification of the image formed by the lens?
A. 1
Correct B. 2
C. 3
D. 4

Correct Answer: B

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Question 25
A particle of mass 1 kg is moving in a circular path of radius 2 m with a speed of 5 m/s. What is the magnitude of the centripetal force acting on the particle?
A. 10 N
B. 12 N
Correct C. 15 N
D. 20 N

Correct Answer: C

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