POST UTME ABU 2023 Physics | Objective

Are you preparing for POST UTME ABU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 Physics (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1
A block of mass 2 kg is attached to a horizontal spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, 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 2
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 20 V. If the dis\tance between the plates is doubled, what is the new capaci\tance?
A. 5 μF
B. 10 μF
C. 20 μF
Correct D. 40 μF

Correct Answer: D

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Question 3
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial pressure is 100 kPa, what is the final pressure?
A. 150 kPa
B. 200 kPa
Correct C. 250 kPa
D. 300 kPa

Correct Answer: C

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Question 4
A magnetic field of 0.5 T is applied to a current-carrying wire of length 1 m. If the current is 2 A, what is the force experienced by the wire?
A. 0.5 N
Correct B. 1 N
C. 2 N
D. 5 N

Correct Answer: B

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Question 5
A sound wave has a frequency of 200 Hz and a speed of 340 m/s. If the wavelength is 1.7 m, what is the amplitude?
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 6
A radioactive sample emits \alpha particles with a half-life of 5 days. If the initial activity is 100 Bq, what is the activity after 10 days?
A. 50 Bq
B. 25 Bq
Correct C. 12.5 Bq
D. 6.25 Bq

Correct Answer: C

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Question 7
A block of mass 2 kg is attached to a horizontal spring with a force cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released from rest, what is the maximum speed of the block?
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 particle moves in a circular path with a radius of 0.5 m and a speed of 2 m/s. If the particle completes one revolution in 2 seconds, 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 9
A magnetic field of 0.5 T is applied to a current-carrying wire with a length of 0.2 m and a resis\tance of 10 Ω. If the current in the wire is 2 A, what is the force exerted on the wire?
A. 0.1 N
Correct B. 0.2 N
C. 0.3 N
D. 0.4 N

Correct Answer: B

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Question 10
A capacitor with a capaci\tance of 10 μF is connected to a battery with a voltage of 5 V. If the capacitor is initially uncharged, what is the charge on the capacitor after 1 second?
A. 0.05 C
Correct B. 0.1 C
C. 0.15 C
D. 0.2 C

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 subjected to a centripetal force of 12 N, what is the magnitude of the force?
A. 8 N
Correct B. 12 N
C. 16 N
D. 24 N

Correct Answer: B

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Question 12
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial volume is 2 L, what is the final volume?
A. 1 L
B. 2 L
Correct C. 3 L
D. 4 L

Correct Answer: C

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Question 13
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. If the current through the circuit is 2 A, what is the voltage across the 6 Ω resistor?
A. 6 V
Correct B. 8 V
C. 10 V
D. 12 V

Correct Answer: B

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Question 14
A ray of light passes from air into a glass block with a re\fractive index of 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 25°
C. 30°
Correct D. 35°

Correct Answer: D

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Question 15
A quantum particle has a wave function given by ψ(x) = Ae^\( -αx^2 \). If the average value of x is 0.5 m, what is the value of α?
A. 0.01 m^\( -2 \)
B. 0.1 m^\( -2 \)
Correct C. 1 m^\( -2 \)
D. 10 m^\( -2 \)

Correct Answer: C

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Question 16
A gas is enclosed in a container with a movable piston. The gas is heated, cau\sing its pressure to increase. Which of the following statements is true about the change in the gas's volume?
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 17
A light ray passes from air into a block of glass. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 25°
Correct C. 30°
D. 35°

Correct Answer: C

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Question 18
A force of 10 N is applied to a spring, cau\sing it to stretch by 2 cm. What is the spring cons\tant?
A. 5 N/m
Correct B. 10 N/m
C. 20 N/m
D. 50 N/m

Correct Answer: B

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Question 19
A particle is moving in a circular path with a cons\tant speed of 5 m/s. What is the magnitude of the acceleration of the particle?
A. 0 m/s^2
B. 5 m/s^2
Correct C. 10 m/s^2
D. 20 m/s^2

Correct Answer: C

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Question 20
A light ray passes through a prism and is re\fracted. What is the angle of deviation?
A. 10°
B. 20°
Correct C. 30°
D. 40°

Correct Answer: C

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Question 21
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. 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 22
A capacitor of capaci\tance 10 μF is connected in series with a resistor of resis\tance 20 Ω. If a voltage of 50 V is applied across the circuit, what is the current flowing through the circuit?
A. 0.25 A
Correct B. 0.5 A
C. 1 A
D. 2 A

Correct Answer: B

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Question 23
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. If the air resis\tance is negligible, what is the maximum height reached by the projectile?
A. 10 m
Correct B. 20 m
C. 30 m
D. 40 m

Correct Answer: B

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Question 24
A body of mass 5 kg is moving with a velocity of 10 m/s. If a force of 20 N is applied to the body, what is the acceleration of the body?
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 25
A capacitor of capaci\tance 20 μF is connected in parallel with a resistor of resis\tance 10 Ω. If a voltage of 100 V is applied across the circuit, what is the current flowing through the resistor?
A. 10 A
Correct B. 20 A
C. 30 A
D. 40 A

Correct Answer: B

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