POST UTME BELLS UNIVERSITY 2025 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -15 cm. What is the focal length of the combination?
A. 10 cm
B. 20 cm
C. 30 cm
D. 40 cm
Question 2
A vector has a magnitude of 5 units and makes an angle of 60° with the x-axis. If it is resolved into its x and y components, calculate the x and y components.
A. A_x = 4.33, A_y = 2.5
B. A_x = 2.5, A_y = 4.33
C. A_x = 3.54, A_y = 2.5
D. A_x = 2.5, A_y = 3.54
Question 3
A parallel-plate capacitor has a capaci\tance of 20 μF. If a voltage of 50 V is applied across the capacitor, what is the energy stored in the capacitor?
A. 250 J
B. 500 J
C. 750 J
D. 1000 J
Question 4
A gas is heated from $20^\circ\text{C}$ to $100^\circ\text{C}$. If the initial volume is $2\,\text{m}^3$ and the final volume is $4\,\text{m}^3$, what is the change in the number of moles of the gas?
A. \frac{1}{2}
B. \frac{1}{3}
C. \frac{1}{4}
D. \frac{1}{5}
Question 5
A sound wave with a frequency of 200 Hz and a wavelength of 0.5 m is traveling through a medium. If the speed of the wave is 340 m/s, calculate the amplitude of the wave.
A. 0.01 m
B. 0.02 m
C. 0.03 m
D. 0.04 m
Question 6
A heat engine operates between two temperatures, 300 K and 400 K. If the efficiency of the engine is 30%, what is the work done by the engine per cycle?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 7
A p\endulum of length 2 m is swinging with a frequency of 2 Hz. If the p\endulum is subjected to a force of 10 N, what is the amplitude of the p\endulum?
A. 0.5 m
B. 1.0 m
C. 1.5 m
D. 2.0 m
Question 8
A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 5 Ω resistor connected in series. If a voltage of 12 V is applied across the circuit, calculate the current flowing through the circuit.
A. 0.4 A
B. 0.6 A
C. 0.8 A
D. 1.0 A
Question 9
A 2 kg block of copper is heated from 20°C to 80°C. If the specific heat capacity of copper is 0.385 J/g°C, calculate the energy required.
A. 1000 J
B. 2000 J
C. 3000 J
D. 4000 J
Question 10
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial pressure is 1.0 x 10^5 Pa, calculate the final pressure.
A. 1.33 x 10^5 Pa
B. 1.67 x 10^5 Pa
C. 2.0 x 10^5 Pa
D. 2.5 x 10^5 Pa
Question 11
A car is traveling at a speed of 20 m/s. If the driver applies the brakes and the car comes to a stop in 4 s, calculate the acceleration of the car.
A. -2 m/s^2
B. -4 m/s^2
C. -6 m/s^2
D. -8 m/s^2
Question 12
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 force?
A. 10 N
B. 12 N
C. 15 N
D. 20 N
Question 13
A light ray passes from air into a glass block with a re\fractive index of 1.5. If the angle of incidence is 30°, calculate the angle of re\fraction.
A. 20°
B. 25°
C. 30°
D. 35°
Question 14
A simple harmonic motion is described by the equation $x(t) = A\cos\( \omega t + \phi \)$, where $A$ is the amplitude, $\omega$ is the angular frequency, and $\phi$ is the phase angle. If the initial displacement is $x(0) = 2\,\text{m}$ and the initial velocity is $v(0) = 0$, what is the phase angle $\phi$?
A. \frac{\pi}{2}
B. \frac{\pi}{3}
C. \frac{\pi}{4}
D. \frac{\pi}{6}
Question 15
A capacitor of capaci\tance 10 μF is connected in series with a resistor of resis\tance 20 Ω. If a voltage of 50 V is applied across the circuit, what is the current flowing through the circuit?
A. 0.25 A
B. 0.5 A
C. 1 A
D. 2 A

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