POST UTME BSU 2023 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A light ray passes from air into a glass slab with a re\fractive index of 1.5. What is the angle of re\fraction?
A. 30°
B. 45°
C. 60°
D. 75°
Question 2
A gas is heated from 20°C to 50°C. If the initial pressure is 1 atm, what is the final pressure?
A. 1.5 atm
B. 2 atm
C. 2.5 atm
D. 3 atm
Question 3
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 subjected 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
Question 4
A particle of mass $m$ is confined to a one-dimensional box of length $L$. If the particle is in the ground state, what is the energy of the particle?
A. \frac{h^2}{2mL^2}
B. \frac{h^2}{4mL^2}
C. \frac{h^2}{8mL^2}
D. \frac{h^2}{16mL^2}
Question 5
A capacitor consists of two parallel plates, each of area 0.1 m^2, separated by a dis\tance of 0.01 m. If the capaci\tance of the capacitor is 10^-6 F, what is the charge stored on the capacitor when a potential difference of 10 V is applied across it?
A. 10^-5 C
B. 10^-6 C
C. 10^-7 C
D. 10^-8 C
Question 6
A parallel plate capacitor has plates of area 0.04 m² and separation 0.002 m. If the dielectric cons\tant of the material between the plates is 3, calculate the capaci\tance.
A. 2.5 μF
B. 5 μF
C. 10 μF
D. 20 μF
Question 7
A 2 m long wire of resis\tance 10 Ω is connected in series with a 5 m long wire of resis\tance 20 Ω. If the total resis\tance of the circuit is 30 Ω, what is the length of the third wire connected in parallel with the 5 m long wire?
A. 1 m
B. 2 m
C. 3 m
D. 4 m
Question 8
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 subjected 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
Question 9
A heat engine operates between two temperatures $T_1$ and $T_2$, with $T_1 > T_2$. If the engine absorbs $Q_1$ amount of heat from the high-temperature reservoir and rejects $Q_2$ amount of heat to the low-temperature reservoir, what is the efficiency of the engine?
A. 1 - \frac{Q_1}{Q_2}
B. 1 - \frac{Q_2}{Q_1}
C. \frac{Q_1}{Q_2}
D. \frac{Q_2}{Q_1}
Question 10
A photon of energy $E$ is incident on a surface. If the photon is reflected, what is the change in the photon's momentum?
A. \frac{E}{c}
B. 2\frac{E}{c}
C. -\frac{E}{c}
D. -2\frac{E}{c}
Question 11
A parallel plate capacitor has a capaci\tance of 20 μF and is charged to a potential difference of 30 V. If a dielectric material with a dielectric cons\tant of 4 is inserted between the plates, what is the new capaci\tance?
A. 80 μF
B. 100 μF
C. 120 μF
D. 140 μF
Question 12
A beam of light passes from air into a glass of re\fractive index 1.8. If the angle of incidence is 40°, what is the angle of re\fraction?
Question 13
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 subjected to a centripetal force of 12 N, what is the angular velocity of the particle?
A. 2 rad/s
B. 4 rad/s
C. 6 rad/s
D. 8 rad/s
Question 14
A photon of energy 2.5 eV is incident on a metal surface with work function 1.5 eV. Calculate the maximum kinetic energy of the emitted electron.
A. 0.5 eV
B. 1 eV
C. 1.5 eV
D. 2 eV
Question 15
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the current flowing through the circuit?
A. 1 A
B. 2 A
C. 3 A
D. 4 A

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