POST UTME OAU 2025 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
A block of mass 5 kg is placed on a frictionless surface. A force of 20 N is applied to the block, cau\sing it to accelerate at 2 m/s^2. What is the magnitude of the normal force acting on the block?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 3
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 4
A block of mass $m$ is placed on a frictionless surface and attached to a spring with spring cons\tant $k$. The block is displaced by a dis\tance $x$ from its equilibrium position and released from rest. Assuming the motion is simple harmonic, find the force $F$ exerted on the block in terms of $m$ and $k$.
A. kx
B. -kx
C. mx
D. -mx
Question 5
A capacitor consists of two parallel plates, each with an area of 0.01 m^2. The dis\tance between the plates is 0.001 m. If a potential difference of 10 V is applied across the capacitor, what is the capaci\tance?
A. 10 μF
B. 100 μF
C. 1000 μF
D. 10,000 μF
Question 6
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 7
A coil of wire with 100 turns is placed in a magnetic field of 0.5 T. If the coil is rotated at a frequency of 50 Hz, what is the induced emf in the coil?
A. 2 V
B. 5 V
C. 10 V
D. 20 V
Question 8
A sound wave with a frequency of 200 Hz has a speed of 340 m/s. What is the wavelength of the sound wave?
A. 1.7 m
B. 1.7 cm
C. 1.7 mm
D. 1.7 km
Question 9
A light ray passes from air into a glass slab with re\fractive index 1.5. If the angle of incidence is 30°, find the angle of re\fraction.
A. 20°
B. 30°
C. 40°
D. 50°
Question 10
A particle of mass 2 kg is attached to a spring with spring cons\tant 100 N/m. If the particle is displaced by 0.2 m from its equilibrium position and released, find its angular frequency.
A. 10 rad/s
B. 20 rad/s
C. 30 rad/s
D. 40 rad/s
Question 11
A wave with a frequency of 200 Hz and a wavelength of 0.5 m is traveling through a medium. If the wave is reflected from a fixed \end, what is the new wavelength of the wave?
A. 0.25 m
B. 0.5 m
C. 1 m
D. 2 m
Question 12
A body is moving in a straight line with a uniform acceleration of 2 m/s². If the body starts from rest, what is its velocity after 5 seconds?
A. 5 m/s
B. 10 m/s
C. 15 m/s
D. 20 m/s
Question 13
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 14
A light ray passes through a convex lens with focal length 20 cm. If the object dis\tance is 30 cm, find the image dis\tance.
A. 10 cm
B. 20 cm
C. 30 cm
D. 40 cm
Question 15
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If air resis\tance is neglected, what is the maximum height reached by the projectile?
A. 15 m
B. 20 m
C. 25 m
D. 30 m

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