POST UTME UNN 2025 Physics | Objective

Are you preparing for POST UTME UNN 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 gas is enclosed in a container with a movable piston. The gas is heated, cau\sing its pressure to increase. If the piston is allowed to move freely, what will happen to the volume of the gas?
A. The volume of the gas will decrease.
Correct B. The volume of the gas will increase.
C. The volume of the gas will remain cons\tant.
D. The volume of the gas will decrease and then increase.

Correct Answer: B

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Question 2
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle is moving at a speed of 4 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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Question 3
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the total resis\tance of the circuit?
A. 6 Ω
B. 8 Ω
Correct C. 10 Ω
D. 12 Ω

Correct Answer: C

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Question 4
A charged particle of mass 1 kg and charge 2 C is moving in a magnetic field of strength 5 T. If the particle is moving at a speed of 3 m/s, what is the magnitude of the 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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Question 5
A capacitor consists of two parallel plates separated by a dis\tance of 2 mm. If the capaci\tance of the capacitor is 10 μF, what is the charge stored on the capacitor when a potential difference of 5 V is applied across it?
A. 50 μC
B. 60 μC
Correct C. 70 μC
D. 80 μC

Correct Answer: C

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Question 6
A 50 Hz AC generator produces an emf given by \( varepsilon = 120 \sin \( 2 pi ft \ \) ) V, where ( f ) is the frequency in Hz. Determine the maximum value of the emf.
A. 60 V
Correct B. 120 V
C. 180 V
D. 240 V

Correct Answer: B

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Question 7
A particle of mass 2 kg is projected from the origin with an initial velocity of 20 m/s at an angle of 60° to the horizontal. Assuming a cons\tant acceleration of 2 m/s² due to gravity, determine the time taken for the particle to reach its maximum height.
A. 1.5 s
Correct B. 2.0 s
C. 2.5 s
D. 3.0 s

Correct Answer: B

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Question 8
A sound wave with a frequency of 200 Hz has a maximum displacement of 0.5 mm. Determine the amplitude of the wave.
A. 0.25 mm
Correct B. 0.5 mm
C. 1.0 mm
D. 1.5 mm

Correct Answer: B

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Question 9
A circuit consists of a 10 Ω resistor and a 20 Ω resistor connected in series. A voltage of 20 V is applied across the circuit. Determine the current flowing through the circuit.
A. 0.5 A
Correct B. 1.0 A
C. 1.5 A
D. 2.0 A

Correct Answer: B

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Question 10
A magnetic field of 0.5 T is applied to a coil of 100 turns. The coil has a resis\tance of 10 Ω. Determine the induced emf in the coil.
A. 0.5 V
Correct B. 1.0 V
C. 1.5 V
D. 2.0 V

Correct Answer: B

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Question 11
A light ray passes through a prism and is re\fracted. If the angle of incidence is 30° and the angle of re\fraction is 20°, what is the angle of deviation?
A. 40°
B. 50°
Correct C. 60°
D. 70°

Correct Answer: C

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Question 12
A body of mass 2 kg is moving with a velocity of 5 m/s. If it is subjected to a force of 10 N, what is the acceleration produced?
A. 0.5 m/s²
B. 1 m/s²
Correct C. 2 m/s²
D. 5 m/s²

Correct Answer: C

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Question 13
A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 5 Ω resistor connected in series. If a voltage of 20 V is applied across the circuit, what is the current flowing through the circuit?
A. 0.5 A
Correct B. 1 A
C. 2 A
D. 5 A

Correct Answer: B

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Question 14
A light source is placed 2 m away from a convex lens of focal length 0.5 m. If the light source is moved 1 m closer to the lens, what is the new image dis\tance?
A. 1 m
Correct B. 2 m
C. 3 m
D. 4 m

Correct Answer: B

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Question 15
A body of mass 5 kg is moving with a velocity of 10 m/s. If it is subjected to a force of 20 N, what is the acceleration produced?
A. 0.5 m/s²
B. 1 m/s²
Correct C. 2 m/s²
D. 5 m/s²

Correct Answer: C

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Question 16
In a nuclear reactor, the fission of ΔU-235 releases 200 MeV of energy per reaction. If 1 MeV is equivalent to 1.602 × 10⁻⁹ J, calculate the total energy released per reaction in joules.
Correct A. 3.204 × 10⁻⁹ J
B. 3.204 × 10⁸ J
C. 3.204 × 10⁺ J
D. 3.204 × 10⁻ J

Correct Answer: A

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Question 17
A beam of light is incident on a prism at an angle of 30°. If the re\fractive index of the prism is 1.5, calculate the angle of re\fraction.
Correct A. 20°
B. 30°
C. 40°
D. 50°

Correct Answer: A

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Question 18
A 5 kg block is attached to a horizontal spring with a force cons\tant of 100 N/m. If the block is displaced by 2 m from its equilibrium position and released from rest, calculate the maximum speed of the block.
A. 2 m/s
Correct B. 4 m/s
C. 6 m/s
D. 8 m/s

Correct Answer: B

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Question 19
A 100 W light bulb is connected to a 120 V power source. If the resis\tance of the bulb is 10 Ω, calculate the current flowing through the bulb.
A. 0.5 A
Correct B. 1 A
C. 2 A
D. 5 A

Correct Answer: B

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Question 20
A 2 kg object is moving in a circular path with a radius of 3 m. If the object has a speed of 4 m/s, calculate the centripetal acceleration.
A. 2 m/s⁻⁹
B. 4 m/s⁻⁹
Correct C. 6 m/s⁻⁹
D. 8 m/s⁻⁹

Correct Answer: C

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Question 21
A 20 Ω resistor is connected in series with a 10 Ω resistor and a 5 Ω resistor. If a 12 V battery is connected across the circuit, what is the current flowing through the 20 Ω resistor?
A. 0.3 A
B. 0.4 A
Correct C. 0.5 A
D. 0.6 A

Correct Answer: C

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Question 22
A magnetic field is produced by a current-carrying wire. If the current is increased by a factor of 2, what happens to the magnetic field?
A. Increases by a factor of 2
Correct B. Increases by a factor of 4
C. Remains the same
D. Decreases by a factor of 2

Correct Answer: B

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Question 23
A heat engine operates between two temperatures, 300 K and 500 K. If the efficiency of the engine is 30%, what is the temperature of the hot reservoir?
A. 400 K
B. 450 K
Correct C. 500 K
D. 550 K

Correct Answer: C

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Question 24
A 50 Hz AC voltage is applied across a 10 Ω resistor. If the current is 2 A, what is the power consumed by the resistor?
A. 100 W
B. 200 W
Correct C. 400 W
D. 600 W

Correct Answer: C

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Question 25
A sound wave has a frequency of 200 Hz and a wavelength of 1.5 m. If the speed of sound is 340 m/s, what is the amplitude of the wave?
A. 0.5 m
B. 1 m
Correct C. 1.5 m
D. 2 m

Correct Answer: C

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