POST UTME UNILORIN 2023 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A source of sound produces a wave with a frequency of 200 Hz. If the speed of sound in air is 340 m/s, calculate the wavelength of the sound wave.
A. 1.7 m
B. 1.8 m
C. 1.9 m
D. 2.0 m
Question 2
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. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 3
A 5 μF capacitor is connected in series with a 10 kΩ resistor. Calculate the time cons\tant of the circuit.
A. 0.05 s
B. 0.1 s
C. 0.2 s
D. 0.5 s
Question 4
A particle of mass 1 kg is moving in a straight line with an initial velocity of 5 m/s. If the particle experiences a force of 10 N for 2 seconds, what is the final velocity of the particle?
A. 10 m/s
B. 15 m/s
C. 20 m/s
D. 25 m/s
Question 5
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 12 V. Calculate the energy stored in the capacitor.
A. 0.72 J
B. 1.0 J
C. 1.2 J
D. 1.5 J
Question 6
A parallel plate capacitor consists of two plates, each of area 0.01 m², separated by a dis\tance of 0.001 m. The capaci\tance is 10 nF. Calculate the potential difference between the plates when a charge of 0.01 C is stored.
A. 10 V
B. 20 V
C. 30 V
D. 40 V
Question 7
A radioactive sample decays from 100 g to 50 g in 10 days. Calculate the half-life of the sample.
A. 5 days
B. 10 days
C. 15 days
D. 20 days
Question 8
A wave has a frequency of 100 Hz and a wavelength of 0.1 m. If the wave is traveling in the positive x-direction, what is the direction of the group velocity?
A. Positive x-direction
B. Negative x-direction
C. Positive y-direction
D. Negative y-direction
Question 9
A circuit consists of a 9 V battery, a 6 Ω resistor, and a 3 Ω resistor connected in parallel. What is the total resis\tance of the circuit?
A. 1.5 Ω
B. 2 Ω
C. 3 Ω
D. 4 Ω
Question 10
A body of mass 0.5 kg is heated from 20°C to 80°C. Calculate the change in entropy.
A. 0.1 J/K
B. 0.2 J/K
C. 0.3 J/K
D. 0.4 J/K
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. Calculate the magnitude of the centripetal acceleration of the particle.
A. 1.6 m/s^2
B. 2.0 m/s^2
C. 2.4 m/s^2
D. 3.0 m/s^2
Question 12
A 50 Hz, 200 V AC supply is connected to a series RLC circuit with R = 10 Ω, L = 0.1 H, and C = 20 μF. Determine the impedance of the circuit.
A. 20 Ω
B. 30 Ω
C. 40 Ω
D. 50 Ω
Question 13
A block of mass 5 kg is attached to a horizontal, massless spring with a force cons\tant of 200 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 as it passes through the equilibrium position.
A. 1.5 m/s
B. 2.0 m/s
C. 2.5 m/s
D. 3.0 m/s
Question 14
A particle of mass 5 kg is moving in a circular path of radius 2 m with a cons\tant speed of 3 m/s. If the particle is subject to a centripetal force of 15 N, what is the magnitude of the acceleration of the particle?
A. 1 m/s^2
B. 2 m/s^2
C. 3 m/s^2
D. 4 m/s^2
Question 15
A wave has a frequency of 50 Hz and a wavelength of 0.2 m. If the wave is traveling in the positive x-direction, what is the direction of the group velocity?
A. Positive x-direction
B. Negative x-direction
C. Positive y-direction
D. Negative y-direction

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