POST UTME ACHIEVERS UNIVERSITY 2023 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 100 Ω resistor is connected in series with a 200 Ω resistor. If a potential difference of 20 V is applied across the combination, calculate the current flowing through the 100 Ω resistor.
A. 0.1 A
B. 0.2 A
C. 0.5 A
D. 1 A
Question 2
A wave has a frequency of 100 Hz and a wavelength of 0.1 m. If the wave is traveling in a medium with a speed of 200 m/s, what is the amplitude of the wave?
A. 0.01 m
B. 0.02 m
C. 0.03 m
D. 0.04 m
Question 3
A magnetic field is produced by a current-carrying wire. If the current is tripled, what happens to the magnetic field?
Question 4
A beam of light passes from air into a glass slab of re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 25°
C. 30°
D. 35°
Question 5
A block of mass 5 kg is susp\ended from a spring with a spring cons\tant of 200 N/m. If the block is displaced by 0.1 m from its equilibrium position and released from rest, calculate the time taken for the block to reach its maximum speed.
A. 0.1 s
B. 0.2 s
C. 0.5 s
D. 1 s
Question 6
A 5.00 g sample of a radioactive subs\tance decays to 1.00 g in 500 seconds. Assuming a first-order decay, calculate the half-life of the subs\tance.
A. \( 1000 , \text{s} \)
B. \( 2000 , \text{s} \)
C. \( 3000 , \text{s} \)
D. \( 4000 , \text{s} \)
Question 7
A particle of mass 1 kg is moving in a circular path of radius 1 m with a cons\tant speed of 1 m/s. What is the magnitude of the net force acting on the particle?
A. 1 N
B. 2 N
C. 3 N
D. 4 N
Question 8
A 100 Ω resistor is connected in parallel with a 200 Ω resistor. If a potential difference of 20 V is applied across the combination, calculate the current flowing through the 100 Ω resistor.
Question 9
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If air resis\tance is neglected, what is the maximum height reached by the projectile?
A. 10 m
B. 20 m
C. 30 m
D. 40 m
Question 10
A 10.0 V battery is connected to a 2.00 kΩ resistor in series with a 3.00 μF capacitor. Calculate the time cons\tant of the RC circuit.
A. \( 6.00 , \text{ms} \)
B. \( 12.0 , \text{ms} \)
C. \( 20.0 , \text{ms} \)
D. \( 60.0 , \text{ms} \)
Question 11
A magnetic field is produced by a current-carrying wire. If the current is doubled, what happens to the magnetic field?
A. Increases by a factor of 2
B. Increases by a factor of 4
C. Remains the same
D. Decreases by a factor of 2
Question 12
A wave has a frequency of 50 Hz and a wavelength of 2 m. What is the speed of the wave?
A. 100 m/s
B. 200 m/s
C. 250 m/s
D. 300 m/s
Question 13
A sound wave with a frequency of 200 Hz has a speed of 343 m/s. What is the wavelength of the sound wave?
A. \( 1.71 , \text{m} \)
B. \( 2.14 , \text{m} \)
C. \( 2.86 , \text{m} \)
D. \( 3.43 , \text{m} \)
Question 14
A 5.00 g sample of a radioactive subs\tance decays to 2.00 g in 1000 seconds. Assuming a first-order decay, calculate the decay cons\tant.
A. \( 0.00500 , \text{s}^{-1} \)
B. \( 0.0100 , \text{s}^{-1} \)
C. \( 0.0200 , \text{s}^{-1} \)
D. \( 0.0500 , \text{s}^{-1} \)
Question 15
A 100 μF capacitor is connected in series with a 200 Ω resistor and a 5 V battery. What is the time cons\tant of the circuit?
A. 0.1 s
B. 0.2 s
C. 0.5 s
D. 1 s

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