POST UTME BELLS UNIVERSITY 2025 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A light source is placed 2 m away from a convex lens with a focal length of 0.5 m. If the object dis\tance is 1.5 m, calculate the image dis\tance.
A. 1 m
B. 2 m
C. 3 m
D. 4 m
Question 2
A wave has a frequency of 20 Hz and a wavelength of 0.1 m. What is the speed of the wave?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 3
A ray of light passes through a prism and is re\fracted. If the angle of incidence is 30° and the angle of re\fraction is 40°, calculate the angle of deviation.
A. 20°
B. 30°
C. 40°
D. 50°
Question 4
A heat engine operates between two temperatures of 500 K and 300 K. If the engine absorbs 100 J of heat from the high-temperature reservoir, what is the efficiency of the engine?
A. 0.2
B. 0.3
C. 0.4
D. 0.5
Question 5
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 2.5 x 10^-9 F, calculate the charge stored when the potential difference between the plates is 100 V.
A. 1.25 x 10^-7 C
B. 2.5 x 10^-7 C
C. 5.0 x 10^-7 C
D. 1.0 x 10^-6 C
Question 6
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 7
A circuit consists of a resistor of resis\tance 10 Ω and a capacitor of capaci\tance 20 μF. If a voltage of 50 V is applied across the circuit, what is the current flowing through the circuit?
A. 0.5 A
B. 1.0 A
C. 1.5 A
D. 2.0 A
Question 8
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the angular velocity is 2 rad/s, calculate the centripetal force.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
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 quantum particle is described by the wave function $\psi(x) = Ae^{ikx}$, where $A$ is a cons\tant and $k$ is the wave number. If the particle is in a one-dimensional box of length $L$, what is the allowed value of $k$?
A. \frac{n\pi}{L}
B. \frac{(n+1)\pi}{L}
C. \frac{n\pi}{2L}
D. \frac{(n+1)\pi}{2L}
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 block of mass 5 kg is moving with a velocity of 10 m/s on a frictionless surface. If the block is subjected to a force of 20 N, 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 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 magnitude of the force?
A. 10 N
B. 12 N
C. 15 N
D. 20 N
Question 14
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 15
A solid sphere of radius 5 cm is floating in a liquid of density 0.8 g/cm³. If the density of the sphere is 2.5 g/cm³, what is the depth of the liquid displaced by the sphere?
A. 2.5 cm
B. 5 cm
C. 10 cm
D. 15 cm

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