POST UTME EKSU 2025 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A light ray passes from air into a glass block at an angle of incidence of 30°. If the angle of re\fraction is 20°, what is the re\fractive index of the glass?
A. \( n = \frac{\sin 30°}{\sin 20°} \)
B. \( n = \frac{\sin 20°}{\sin 30°} \)
C. \( n = \frac{\sin 30°}{\sin 20°} + 1 \)
D. \( n = \frac{\sin 20°}{\sin 30°} - 1 \)
Question 2
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 required to stop the particle in 2 s?
A. 24 N
B. 48 N
C. 96 N
D. 192 N
Question 3
A block of mass 5 kg is attached to a horizontal, massless spring with a force cons\tant of 200 N/m. The block is displaced by 2 m from its equilibrium position and released from rest. What is the maximum speed of the block?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 4
A simple p\endulum consists of a point mass $m$ attached to a massless string of length $L$. If the p\endulum is released from rest at an angle $\theta$ to the vertical, find the angular frequency $\omega$ of the p\endulum.
A. \( \sqrt{\frac{g}{L}} \)
B. \( \sqrt{\frac{L}{g}} \)
C. \( \frac{g}{L} \)
D. \( \frac{L}{g} \)
Question 5
A car of mass 1500 kg is traveling at a speed of 25 m/s when the brakes are applied. If the car is brought to rest in a dis\tance of 50 m, what is the magnitude of 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 6
A block of mass 5 kg is attached to a horizontal spring with a force cons\tant of 200 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. \( v_{max} = \sqrt{\frac{kx^2}{m}} \)
B. \( v_{max} = \sqrt{\frac{mgx}{k}} \)
C. \( v_{max} = \sqrt{\frac{mg}{k}} \)
D. \( v_{max} = \sqrt{\frac{k}{mg}} \)
Question 7
A photon of energy 2 eV is incident on a metal surface with a work function of 1.5 eV. What is the maximum kinetic energy of the ejected electron?
A. 0.5 eV
B. 1 eV
C. 1.5 eV
D. 2 eV
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 subject to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?
A. 4 m/s^2
B. 6 m/s^2
C. 8 m/s^2
D. 10 m/s^2
Question 9
A force of 10 N is applied to an object of mass 2 kg. What is the acceleration of the object?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 10
A coil of wire with 100 turns is placed in a magnetic field of strength 2 T. The coil has a radius of 0.1 m. What is the induced emf in the coil?
A. 0.2 V
B. 0.4 V
C. 0.6 V
D. 0.8 V
Question 11
A block of mass 5 kg is attached to a horizontal, massless spring with a force cons\tant of 200 N/m. The block is displaced by 2 m from its equilibrium position and released from rest. What is the maximum speed of the block?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 12
A car of mass 1200 kg is traveling at a speed of 30 m/s when the brakes are applied. If the car is brought to rest in a dis\tance of 60 m, what is the magnitude of 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 13
A particle of mass $m$ is moving in a circular path of radius $r$ with a cons\tant speed $v$. If the particle experiences a uniform magnetic field of strength $B$, find the force $F$ exerted on the particle.
A. \( qvB \)
B. \( qv^2 \)
C. \( qB^2 \)
D. \( v^2B \)
Question 14
A heat engine operates between two temperatures $T_1$ and $T_2$. If the engine absorbs heat $Q_1$ from the high-temperature reservoir and rejects heat $Q_2$ to the low-temperature reservoir, find the efficiency of the engine in terms of $Q_1$, $Q_2$, $T_1$, and $T_2$.
A. 1 - \frac{Q_2}{Q_1}
B. \frac{Q_2}{Q_1}
C. 1 + \frac{Q_2}{Q_1}
D. \frac{Q_1}{Q_2}
Question 15
A circuit consists of a resistor of resis\tance 10 Ω and an inductor of induc\tance 2 H. If a voltage of 20 V is applied across the circuit, what is the current flowing through the circuit?
A. 0.5 A
B. 1 A
C. 2 A
D. 4 A

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: