POST UTME BELLS UNIVERSITY 2023 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1000 mL flask contains 0.5 M HCl and 0.5 M NaOH. Calculate the number of moles of HCl that react with NaOH.
A. 0.25 mol
B. 0.5 mol
C. 0.75 mol
D. 1.0 mol
Question 2
A 5 μF capacitor is connected in parallel with a 10 μF capacitor. If a voltage of 10 V is applied across the circuit, what is the magnitude of the charge stored on the 5 μF capacitor?
A. 50 μC
B. 100 μC
C. 150 μC
D. 200 μC
Question 3
A block of mass 5 kg is placed on a frictionless surface and a horizontal force of 10 N is applied to it. Calculate the acceleration of the block.
A. 0.5 m/s^2
B. 1 m/s^2
C. 2 m/s^2
D. 5 m/s^2
Question 4
A heat engine operates between a high-temperature reservoir at 500 K and a low-temperature reservoir at 300 K. What is the efficiency of the engine?
A. 0.2
B. 0.3
C. 0.4
D. 0.5
Question 5
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. What is the magnitude of the force acting on the particle?
A. 8 N
B. 12 N
C. 16 N
D. 20 N
Question 6
A vector A has a magnitude of 5 units and makes an angle of 60° with the x-axis. If a vector B has a magnitude of 3 units and makes an angle of 30° with the x-axis, calculate the magnitude of the resul\tant vector A + B.
A. 5.5 units
B. 6.5 units
C. 7.5 units
D. 8.5 units
Question 7
A ray 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 8
A block of mass 5 kg is placed on a frictionless surface and a horizontal force of 20 N is applied to it. What is the acceleration of the block?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 9
A radioactive sample has an initial activity of 100 Bq. After 2 hours, the activity decreases to 50 Bq. What is the half-life of the sample?
A. 1 hour
B. 2 hours
C. 3 hours
D. 4 hours
Question 10
A uniform magnetic field of magnitude 2.0 T is directed along the z-axis. A current of 5.0 A flows through a straight wire of length 2.0 m, placed along the x-axis. What is the magnitude of the magnetic force experienced by the wire?
A. 0.1 N
B. 0.2 N
C. 0.3 N
D. 0.4 N
Question 11
A 2 A current flows through a 10 Ω resistor. Calculate the power dissipated in the resistor.
A. 20 W
B. 40 W
C. 60 W
D. 80 W
Question 12
A capacitor of capaci\tance 10 μF is connected across a 20 V battery. Calculate the charge stored in the capacitor.
A. 0.2 C
B. 0.4 C
C. 0.6 C
D. 0.8 C
Question 13
A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -30 cm. Find the focal length of the combination.
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
Question 14
A spring with a spring cons\tant of 100 N/m is stretched by 2.0 m. What is the potential energy stored in the spring?
A. 200 J
B. 400 J
C. 600 J
D. 800 J
Question 15
A light ray passes through a converging lens and is focused at a point 15 cm from the lens. If the focal length of the lens is 10 cm, calculate the object dis\tance.
A. 5 cm
B. 10 cm
C. 15 cm
D. 20 cm

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