POST UTME BELLS UNIVERSITY 2023 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A radioactive sample decays at a rate of 0.05% per hour. If the initial mass of the sample is 100 g, how much of the sample will remain after 5 hours?
A. 90 g
B. 95 g
C. 98 g
D. 99 g
Question 2
A 50 Hz AC generator produces an emf given by e(t) = 100 \sin(314t) V. Find the rms value of the emf.
A. 70.71 V
B. 71.42 V
C. 71.85 V
D. 72.11 V
Question 3
A fluid of density 1000 kg/m³ is subjected to a pressure of 10 kPa. Find the pressure at a depth of 5 m below the surface.
A. 10.5 kPa
B. 11 kPa
C. 11.5 kPa
D. 12 kPa
Question 4
A spring with a spring cons\tant of 100 N/m is stretched by 2 m. What is the potential energy stored in the spring?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 5
A particle of mass 2 kg is moving in a circular path of radius 3 m. If the particle experiences a centripetal force of 10 N, what is its angular velocity?
A. 2 rad/s
B. 4 rad/s
C. 6 rad/s
D. 8 rad/s
Question 6
A gas at 300 K and 1 atm expands to 2 atm. Assuming ideal gas behavior, calculate the new temperature of the gas.
A. 400 K
B. 500 K
C. 600 K
D. 700 K
Question 7
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 8
A circuit consists of a 10 Ω resistor and a 20 Ω resistor connected in series. If a voltage of 20 V is applied across the circuit, what is the magnitude of the current flowing through the circuit?
A. 1 A
B. 2 A
C. 3 A
D. 4 A
Question 9
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
Question 10
A circuit consists of a 10 Ω resistor and a 20 Ω resistor connected in parallel. If a voltage of 20 V is applied across the circuit, calculate the current flowing through the 10 Ω resistor.
A. 1 A
B. 2 A
C. 3 A
D. 4 A
Question 11
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 12
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 13
A heat engine operates between the temperatures 500 K and 300 K. If the efficiency of the engine is 30%, calculate the work done by the engine.
A. 1000 J
B. 2000 J
C. 3000 J
D. 4000 J
Question 14
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 15
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°

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