POST UTME UNILORIN 2023 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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
Question 2
A particle of mass 0.5 kg is moving in a circular path of radius 2 m with a speed of 4 m/s. What is the magnitude of the centripetal acceleration of the particle?
A. 4 m/s^2
B. 8 m/s^2
C. 16 m/s^2
D. 32 m/s^2
Question 3
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 4
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 5
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. 500 m/s
D. 1000 m/s
Question 6
A particle of mass 0.5 kg is projected from the origin with an initial velocity of 20 m/s at an angle of 60° to the horizontal. Calculate the time of flight.
A. 2.0 s
B. 3.0 s
C. 4.0 s
D. 5.0 s
Question 7
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle has a speed of 4 m/s, calculate the centripetal force acting on the particle.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 8
A photon of energy 2 eV is incident on a metal surface. If the work function of the metal is 1 eV, calculate the maximum kinetic energy of the electron emitted.
A. 1 eV
B. 2 eV
C. 3 eV
D. 4 eV
Question 9
A 10 μC charge is placed at the center of a circular loop of radius 2 m. Calculate the electric field at a point on the loop 30° from the positive x-axis.
A. 2.0 × 10^4 N/C
B. 4.0 × 10^4 N/C
C. 6.0 × 10^4 N/C
D. 8.0 × 10^4 N/C
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 0.2 kg is moving in a circular path of radius 1 m with a speed of 3 m/s. What is the magnitude of the centripetal 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 12
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 13
A gas is contained in a cylinder of volume 2.5 liters at a temperature of 300 K. If the pressure of the gas is increased to 2 atm, what is the new volume of the gas, assuming the gas obeys Boyle's Law?
A. 1.25 liters
B. 2.5 liters
C. 5 liters
D. 10 liters
Question 14
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 15
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

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