POST UTME OAU 2025 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A block of mass 5 kg is attached to a spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position, what is the potential energy stored in the spring?
A. 2 J
B. 5 J
C. 10 J
D. 20 J
Question 2
A \tank contains 1000 kg of water at a temperature of 20°C. If the water is heated to 80°C, what is the change in volume of the water?
A. 0.1 m^3
B. 0.2 m^3
C. 0.3 m^3
D. 0.4 m^3
Question 3
A projectile is launched at an angle of 30° above the horizontal with an initial velocity of 50 m/s. If the acceleration due to gravity is 9.8 m/s², what is the maximum height reached by the projectile?
A. 25 m
B. 30 m
C. 35 m
D. 40 m
Question 4
A light ray passes through a prism with apex angle $A$ and is re\fracted at an angle $\theta$ to the normal. If the angle of incidence is $i$, find the angle of re\fraction $\theta$ in terms of $A$ and $i$.
A. \frac{A}{2} - \frac{i}{2}
B. \frac{A}{2} + \frac{i}{2}
C. \frac{A}{2} - \frac{i}{2}
D. \frac{i}{2} - \frac{A}{2}
Question 5
A charged particle is moving in a magnetic field. If the particle has a charge of +2e, a mass of 10^-27 kg, and is moving at a speed of 5 × 10^6 m/s, what is the radius of the circular path it will follow?
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 6
A light ray passes through a lens with focal length $f$ and is re\fracted at an angle $\theta$ to the normal. If the angle of incidence is $i$, find the angle of re\fraction $\theta$ in terms of $f$ and $i$.
A. \frac{f}{i}
B. \frac{i}{f}
C. \frac{f}{i} + \frac{i}{f}
D. \frac{i}{f} - \frac{f}{i}
Question 7
A gas is enclosed in a container with a movable piston. The gas is heated, cau\sing its temperature to increase. What is the effect on the pressure of the gas?
A. The pressure decreases
B. The pressure increases
C. The pressure remains cons\tant
D. The pressure becomes zero
Question 8
A block of mass 5 kg is attached to a horizontal spring with a spring cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. What is the maximum speed of the block?
A. 0.5 m/s
B. 1.0 m/s
C. 1.5 m/s
D. 2.0 m/s
Question 9
A sound wave with frequency 200 Hz and amplitude 0.1 m is traveling through a medium with speed 340 m/s. If the wave is reflected from a rigid wall, find the intensity of the reflected wave.
A. 10 W/m²
B. 20 W/m²
C. 30 W/m²
D. 40 W/m²
Question 10
A uniform magnetic field of magnitude 2 T is directed along the z-axis. A current of 5 A flows in a circular loop of radius 0.1 m, placed in the x-y plane. What is the magnitude of the magnetic moment of the loop?
A. 0.05 A m^2
B. 0.1 A m^2
C. 0.2 A m^2
D. 0.5 A m^2
Question 11
A capacitor of capaci\tance 2 μF is connected to a battery of voltage 10 V. What is the magnitude of the charge stored on the capacitor?
A. 20 μC
B. 40 μC
C. 60 μC
D. 80 μC
Question 12
A particle of mass 3 kg is moving in a circular path of radius 4 m with a cons\tant speed of 6 m/s. If the particle is subjected to a centripetal force of 18 N, what is the magnitude of the acceleration of the particle?
A. 12 m/s^2
B. 15 m/s^2
C. 18 m/s^2
D. 20 m/s^2
Question 13
A radioactive sample has a half-life of 10 years. If the initial activity is 100 Bq, what is the activity after 20 years?
A. 10 Bq
B. 20 Bq
C. 50 Bq
D. 100 Bq
Question 14
A meter stick is placed on a horizontal surface with one \end against a wall. If the meter stick is 1 m long and the wall is 0.8 m away from the other \end of the stick, what is the dis\tance between the wall and the other \end of the stick?
A. 0.2 m
B. 0.3 m
C. 0.4 m
D. 0.5 m
Question 15
A sound wave with a frequency of 200 Hz is traveling through a medium. If the speed of the sound wave is 340 m/s, what is the wavelength of the sound wave?
A. 1.7 m
B. 1.7 cm
C. 1.7 km
D. 1.7 μm

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