POST UTME ACHIEVERS UNIVERSITY 2025 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A wave with frequency f and wavelength λ is traveling through a medium with speed v. If the frequency is doubled to 2f, what is the new wavelength λ_new?
A. λ / 2
B. λ * 2
C. v / 2f
D. v / f
Question 2
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 projectile lands 10 m away from the launch point, what is the time of flight?
A. 1 s
B. 2 s
C. 3 s
D. 4 s
Question 3
A particle of mass 1 kg is moving in a circular path with a radius of 2 m. If the particle has a velocity of 4 m/s, calculate the centripetal acceleration.
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 4
A gas expands from 1.5 L to 2.5 L against a cons\tant external pressure of 2 atm. If the initial temperature is 300 K, what is the final temperature?
A. 350 K
B. 400 K
C. 450 K
D. 500 K
Question 5
A gas is confined to a cylinder with a movable piston. The gas is heated, cau\sing the piston to move upward. What is the direction of the net force acting on the gas?
A. Upward
B. Downward
C. Rightward
D. Leftward
Question 6
A magnetic field of 0.5 T is directed along the z-axis. A current of 2 A is flowing in a wire loop of radius 0.2 m. What is the magnitude of the magnetic moment of the loop?
A. 0.1 A m^2
B. 0.1256 A m^2
C. 0.15 A m^2
D. 0.2 A m^2
Question 7
A force of 10 N is applied to an object of mass 5 kg. What is the acceleration of the object?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 8
A simple harmonic motion has a maximum displacement of 5 cm and a period of 2 s. What is the angular frequency (ω) of the motion?
A. 1.57 rad/s
B. 3.14 rad/s
C. 6.28 rad/s
D. 9.42 rad/s
Question 9
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 8 nF, what is the dielectric cons\tant of the material between the plates?
A. 1.6
B. 2.5
C. 3.2
D. 4.0
Question 10
A thermodynamic system undergoes a process from state A to state B, where the internal energy (U) increases by 100 J. If the system also undergoes a process from state B to state C, where the internal energy (U) decreases by 50 J, what is the change in internal energy (ΔU) for the entire process from state A to state C?
A. 50 J
B. 0 J
C. 100 J
D. 150 J
Question 11
A heat engine operates between two temperatures of 500 K and 300 K. If the engine has an efficiency of 30%, what is the maximum possible work output?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 12
A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.5 m from its equilibrium position and released, calculate the frequency of oscillation.
A. 1 Hz
B. 2 Hz
C. 5 Hz
D. 10 Hz
Question 13
A 100 Ω resistor is connected in series with a 50 Ω resistor and a 20 Ω resistor. What is the equivalent resis\tance?
A. 120 Ω
B. 150 Ω
C. 170 Ω
D. 200 Ω
Question 14
A particle of mass m is moving in a circular path of radius r with a cons\tant speed v. The particle is subject to a centripetal force F_c = \( m * v^2 \) / r. If the particle's speed is doubled to 2v, what is the new centripetal force F_c_new?
A. 4m * v^2 / r
B. m * v^2 / r
C. 2m * v^2 / r
D. m * (2v)^2 / r
Question 15
A ray of light passes from air into a glass slab 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°

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