POST UTME RSU 2025 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the dielectric cons\tant of the material between the plates is 3, calculate the capaci\tance.
A. 0.01 F
B. 0.02 F
C. 0.03 F
D. 0.04 F
Question 2
A radioactive sample has a half-life of 10 years. If the initial activity is 100 Bq, what is the activity after 20 years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 3
A current of 5 A flows through a wire of resis\tance 2 Ω. If the voltage across the wire is 10 V, what is the power consumed?
A. 25 W
B. 50 W
C. 100 W
D. 200 W
Question 4
A light source is placed 2 m away from a convex lens with a focal length of 0.5 m. If the image is formed 1 m away from the lens, calculate the magnification of the lens.
A. 2
B. 3
C. 4
D. 5
Question 5
A 100 μF capacitor is connected in parallel with a 200 μF capacitor. A 12 V battery is connected across the circuit. What is the equivalent capaci\tance?
A. 50 μF
B. 100 μF
C. 200 μF
D. 300 μF
Question 6
A circuit consists of a 12 V battery, a 4 Ω resistor, and an inductor of 2 H. If the switch is closed at t = 0, what is the current in the circuit at t = 2 s?
A. 0.5 A
B. 1 A
C. 2 A
D. 4 A
Question 7
A light ray passes from air into a glass slab of thickness 2.5 cm and re\fractive index 1.5. If the angle of incidence is 30°, calculate the angle of re\fraction.
A. 20°
B. 25°
C. 30°
D. 35°
Question 8
A 10 μF capacitor is connected in series with a 20 Ω resistor. A 12 V battery is connected across the circuit. What is the current in the circuit?
A. 0.6 A
B. 0.8 A
C. 1.2 A
D. 1.5 A
Question 9
A circular motion is described by the equation x(t) = A \cos\( \omega t + \phi \). If the angular frequency is 2 rad/s and the phase angle is 30°, calculate the velocity of the particle at time t = 1 s.
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 10
A heat engine operates between two temperatures of 500 K and 300 K. If the engine has an efficiency of 30%, what is the temperature of the hot reservoir?
A. 400 K
B. 500 K
C. 600 K
D. 700 K
Question 11
A projectile is launched from the origin with an initial velocity of 20 m/s at an angle of 60° above the horizontal. Assuming the only force acting on the projectile is gravity, calculate the time of flight.
A. 2.00 s
B. 4.00 s
C. 6.00 s
D. 8.00 s
Question 12
A gas is enclosed in a container with a movable piston. The gas is heated from 300 K to 400 K. If the volume of the gas is 2.5 L at 300 K, what is the new volume of the gas at 400 K, assuming the pressure remains cons\tant?
A. 3.33 L
B. 4.17 L
C. 5.00 L
D. 6.25 L
Question 13
A beam of light passes from air into a glass of re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 30°
C. 40°
D. 50°
Question 14
A gas is enclosed in a container with a movable piston. The gas is heated, cau\sing its pressure to increase. Which of the following statements is true about the change in the gas's internal energy?
A. The internal energy increases
B. The internal energy decreases
C. The internal energy remains cons\tant
D. The internal energy increases, but the change is not related to the work done
Question 15
A particle is projected at an angle of 60° to the horizontal with an initial velocity of 20 m/s. If the acceleration due to gravity is 9.8 m/s², what is the time of flight?
A. 2.5 s
B. 3.3 s
C. 4.2 s
D. 5.0 s

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