POST UTME UNILAG 2022 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 2022 Physics (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial pressure is 1.2 atm, what is the final pressure?
A. 1.5 atm
Correct B. 2.0 atm
C. 2.5 atm
D. 3.0 atm

Correct Answer: B

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Question 2
A 100 V AC supply is connected across a 20 Ω resistor. If the frequency of the AC supply is 50 Hz, what is the rms value of the current?
A. 2.5 A
Correct B. 5.0 A
C. 7.5 A
D. 10.0 A

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. What is the magnitude of the centripetal force?
A. 10 N
B. 20 N
Correct C. 30 N
D. 40 N

Correct Answer: C

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Question 4
A 50 W light bulb is connected across a 230 V AC supply. If the power factor is 0.8, what is the current drawn?
A. 0.25 A
Correct B. 0.5 A
C. 0.75 A
D. 1.0 A

Correct Answer: B

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Question 5
A convex lens of focal length 20 cm is used to form an image of an object placed 30 cm away. What is the magnification of the image?
A. 0.5
Correct B. 1.0
C. 1.5
D. 2.0

Correct Answer: B

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Question 6
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 subjected to a centripetal force of 12 N, what is the angle between the force and the radius vector?
A. 30°
B. 45°
Correct C. 60°
D. 90°

Correct Answer: C

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Question 7
A convex lens of focal length 20 cm forms an image of an object placed 30 cm in front of it. If the object is moved 10 cm closer to the lens, what is the new image dis\tance?
Correct A. 15 cm
B. 20 cm
C. 25 cm
D. 30 cm

Correct Answer: A

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Question 8
A gas at 300 K expands from 1 L to 2 L against a cons\tant external pressure of 2 atm. What is the work done by the gas?
Correct A. -400 J
B. -200 J
C. -100 J
D. -50 J

Correct Answer: A

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Question 9
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the current flowing through the 6 Ω resistor?
A. 0.5 A
B. 1 A
Correct C. 1.5 A
D. 2 A

Correct Answer: C

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Question 10
A body of mass 5 kg is at rest on a horizontal surface. A force of 10 N is applied to it for 2 s. What is the velocity of the body after the force is removed?
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 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. 8 m/s^2
B. 12 m/s^2
Correct C. 16 m/s^2
D. 20 m/s^2

Correct Answer: C

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Question 12
A sound wave with a frequency of 200 Hz and a wavelength of 0.5 m is traveling through a medium with a speed of 340 m/s. What is the amplitude of the wave?
A. 0.01 m
Correct B. 0.1 m
C. 0.5 m
D. 1 m

Correct Answer: B

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Question 13
A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 30 Ω resistor connected in series. If a voltage of 120 V is applied across the circuit, what is the current flowing through the circuit?
A. 2 A
B. 4 A
Correct C. 6 A
D. 8 A

Correct Answer: C

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Question 14
A projectile is launched from the ground with an initial velocity of 50 m/s at an angle of 60° above the horizontal. If the acceleration due to gravity is 9.8 m/s^2, what is the maximum height reached by the projectile?
A. 25 m
Correct B. 50 m
C. 75 m
D. 100 m

Correct Answer: B

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Question 15
A magnetic field of 0.5 T is applied to a coil of wire with 100 turns. If the coil is connected to a battery with a voltage of 12 V, what is the induced emf in the coil?
A. 6 V
Correct B. 12 V
C. 18 V
D. 24 V

Correct Answer: B

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Question 16
A particle of mass 2 kg is projected from the origin with an initial velocity of 10 m/s at an angle of 60° to the horizontal. If the particle is subject to a uniform gravitational field of 9.8 m/s^2, determine the time of flight.
A. 4.0 s
Correct B. 5.0 s
C. 6.0 s
D. 7.0 s

Correct Answer: B

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Question 17
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. If the current in the circuit is 1.5 A, determine the power dissipated in the 6 Ω resistor.
A. 4.5 W
B. 6.0 W
Correct C. 7.2 W
D. 9.0 W

Correct Answer: C

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Question 18
A gas at 300 K expands from 1 L to 2 L against a cons\tant external pressure of 1 atm. If the gas is ideal, determine the work done.
A. 2.0 J
Correct B. 4.0 J
C. 6.0 J
D. 8.0 J

Correct Answer: B

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Question 19
A radioactive sample decays from 100 mg to 50 mg in 10 minutes. If the decay cons\tant is 0.05 min^-1, determine the half-life.
A. 20 min
B. 30 min
Correct C. 40 min
D. 50 min

Correct Answer: C

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Question 20
A simple harmonic oscillator has a frequency of 2 Hz and an amplitude of 5 cm. If the oscillator is displaced from its equilibrium position by 2 cm, determine the maximum acceleration.
A. 0.2 m/s^2
B. 0.4 m/s^2
Correct C. 0.6 m/s^2
D. 0.8 m/s^2

Correct Answer: C

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Question 21
A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. It is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the total energy of the particle at time t = 0.
A. 10 J
Correct B. 20 J
C. 30 J
D. 40 J

Correct Answer: B

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Question 22
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. Calculate the total resis\tance of the circuit.
A. 8 Ω
B. 10 Ω
Correct C. 12 Ω
D. 16 Ω

Correct Answer: C

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Question 23
A block of mass 5 kg is moving with a velocity of 10 m/s on a frictionless surface. Calculate the work done by the force of gravity on the block as it moves 2 m upwards.
A. 50 J
B. 60 J
C. 70 J
Correct D. 80 J

Correct Answer: D

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Question 24
A capacitor of capaci\tance 10 μF is connected to a 12 V battery. Calculate the charge stored on the capacitor.
A. 120 μC
B. 140 μC
Correct C. 160 μC
D. 180 μC

Correct Answer: C

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Question 25
A coil of induc\tance 50 mH is connected to a 12 V battery. Calculate the energy stored in the coil.
A. 1.5 J
B. 2.5 J
C. 3.5 J
Correct D. 4.5 J

Correct Answer: D

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