POST UTME LASU 2025 Physics | Objective

Are you preparing for POST UTME LASU 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 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 magnitude of the acceleration of the particle?
A. 16 m/s^2
B. 32 m/s^2
Correct C. 48 m/s^2
D. 64 m/s^2

Correct Answer: C

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Question 2
A radioactive sample has a half-life of 10 years. If the initial activity of the sample is 1000 Bq, what is the activity of the sample after 20 years?
Correct A. 125 Bq
B. 250 Bq
C. 500 Bq
D. 1000 Bq

Correct Answer: A

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Question 3
A convex lens of focal length 20 cm is used to form an image of an object placed 30 cm from the lens. What is the magnification of the image?
Correct A. 1/2
B. 1/3
C. 2/3
D. 3/4

Correct Answer: A

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Question 4
A force of 10 N is applied to an object of mass 5 kg, cau\sing it to accelerate at 2 m/s^2. What is the work done on the object?
A. 20 J
Correct B. 40 J
C. 60 J
D. 80 J

Correct Answer: B

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Question 5
A particle of mass 1 kg is moving in a straight line with an initial velocity of 5 m/s. If the particle is subjected to a cons\tant force of 2 N, what is the velocity of the particle after 10 s?
A. 3 m/s
B. 5 m/s
Correct C. 7 m/s
D. 9 m/s

Correct Answer: C

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Question 6
A 2.5 mH inductor is connected in series with a 4.2 kΩ resistor and a 12 V battery. Assuming the inductor has an initial current of 0 A, calculate the time it takes for the current to reach 75% of its maximum value.
A. 0.25 s
B. 0.5 s
Correct C. 0.75 s
D. 1 s

Correct Answer: C

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Question 7
A particle of mass 0.5 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.2 m from its equilibrium position and released from rest, calculate the maximum speed of the particle.
A. 0.5 m/s
B. 1 m/s
Correct C. 1.5 m/s
D. 2 m/s

Correct Answer: C

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Question 8
A wave with a frequency of 50 Hz and a wavelength of 2 m is traveling through a medium. If the wave has a speed of 100 m/s, calculate the amplitude of the wave.
A. 0.02 m
B. 0.04 m
Correct C. 0.06 m
D. 0.08 m

Correct Answer: C

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Question 9
A light ray passes from air into a glass block with a re\fractive index of 1.5. If the angle of incidence is 30°, calculate the angle of re\fraction.
A. 20°
Correct B. 25°
C. 30°
D. 35°

Correct Answer: B

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Question 10
A 5 kg block is placed on a horizontal surface with a coefficient of friction of 0.2. If a horizontal force of 10 N is applied to the block, calculate the acceleration of the block.
A. 0.5 m/s^2
B. 1 m/s^2
Correct C. 1.5 m/s^2
D. 2 m/s^2

Correct Answer: C

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Question 11
A 2.5 m long wire of resis\tance 3.5 Ω is connected in series with a 4.2 V battery. If the current flowing through the wire is 0.5 A, what is the power dissipated in the wire?
A. 4.25 W
Correct B. 6.75 W
C. 8.1 W
D. 10.5 W

Correct Answer: B

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Question 12
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. 4 m/s²

Correct Answer: C

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Question 13
A 100 W bulb is connected to a 220 V supply. If the current flowing through the bulb is 0.5 A, what is the resis\tance of the bulb?
A. 2 Ω
B. 4 Ω
Correct C. 6 Ω
D. 8 Ω

Correct Answer: C

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Question 14
A wave of wavelength 2 m and frequency 5 Hz is traveling through a medium. If the speed of the wave is 10 m/s, what is the amplitude of the wave?
A. 0.5 m
Correct B. 1 m
C. 2 m
D. 5 m

Correct Answer: B

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Question 15
A 10 kg body is moving with a velocity of 5 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. 4 m/s²

Correct Answer: C

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Question 16
A parallel plate capacitor has a capaci\tance of 2 μF. If a potential difference of 10 V is applied across the plates, what is the charge stored on the capacitor?
A. 20 μC
Correct B. 40 μC
C. 60 μC
D. 80 μC

Correct Answer: B

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Question 17
A wave has a frequency of 50 Hz and a wavelength of 10 m. What is the speed of the wave?
A. 250 m/s
Correct B. 500 m/s
C. 750 m/s
D. 1000 m/s

Correct Answer: B

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Question 18
A concave lens has a focal length of -20 cm. What is the nature of the lens?
A. Convex
Correct B. Concave
C. Plane
D. Spherical

Correct Answer: B

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Question 19
A gas has a pressure of 2 atm and a volume of 10 L. What is the temperature of the gas?
A. 300 K
B. 400 K
Correct C. 500 K
D. 600 K

Correct Answer: C

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Question 20
A point charge of +2 μC is placed at the origin. What is the electric potential at a point 2 m away from the charge?
A. 100 V
Correct B. 200 V
C. 300 V
D. 400 V

Correct Answer: B

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