POST UTME OAU 2023 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A wave with a frequency of 50 Hz and a wavelength of 2 m is traveling through a medium. What is the speed of the wave?
A. v = 100 m/s
B. v = 200 m/s
C. v = 300 m/s
D. v = 400 m/s
Question 2
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial pressure is 1 atm, calculate the final pressure.
A. 1.5 atm
B. 2 atm
C. 3 atm
D. 4 atm
Question 3
A ray of light passes from air into a glass of re\fractive index 1.5. If the angle of incidence is 30°, calculate the angle of re\fraction.
A. 20°
B. 30°
C. 40°
D. 50°
Question 4
A radioactive sample of Uranium-238 undergoes \alpha decay. If the initial mass of the sample is 100 g, and the half-life of Uranium-238 is 4.5 billion years, what is the mass of the sample after 9 billion years?
A. 25 g
B. 50 g
C. 75 g
D. 87.5 g
Question 5
A 2 kg block is attached to a horizontal spring with a force cons\tant of 100 N/m. If the block is displaced by 0.1 m from its equilibrium position, what is the potential energy stored in the spring?
A. 1 J
B. 2 J
C. 5 J
D. 10 J
Question 6
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. The maximum height reached by the projectile is
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Question 7
A light source is placed 2 m away from a convex mirror with a focal length of 0.5 m. What is the image dis\tance?
A. d_i = 1 m
B. d_i = 2 m
C. d_i = 3 m
D. d_i = 4 m
Question 8
A gas is heated from 20°C to 50°C at cons\tant volume. If the initial pressure is 1 atm, what is the final pressure?
A. 1 atm
B. 2 atm
C. 3 atm
D. 4 atm
Question 9
A 100 W bulb is connected to a 230 V mains supply. What is the current drawn by the bulb?
A. 0.4 A
B. 0.5 A
C. 0.6 A
D. 0.7 A
Question 10
A sound wave has a frequency of 200 Hz and a wavelength of 1.5 m. What is the speed of the sound wave?
A. 300 m/s
B. 600 m/s
C. 900 m/s
D. 1200 m/s
Question 11
A 5 μF capacitor is connected in series with a 10 Ω resistor. If a 12 V battery is connected across the circuit, what is the time cons\tant?
A. 0.2 s
B. 0.5 s
C. 1 s
D. 2 s
Question 12
A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. It is displaced by 0.5 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the angular frequency of the particle's motion.
A. 1 rad/s
B. 2 rad/s
C. 5 rad/s
D. 10 rad/s
Question 13
A sound wave has a frequency of 200 Hz and a speed of 340 m/s. If the amplitude of the wave is 0.01 m, calculate the intensity of the wave.
A. 10^-3 W/m^2
B. 10^-4 W/m^2
C. 10^-5 W/m^2
D. 10^-6 W/m^2
Question 14
A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. If a 12 V battery is connected across the circuit, what is the potential difference across the 20 Ω resistor?
A. 6 V
B. 8 V
C. 10 V
D. 12 V
Question 15
A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. If the total resis\tance is 60 Ω, what is the value of the unknown resistor?
A. 5 Ω
B. 10 Ω
C. 20 Ω
D. 30 Ω

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