POST UTME BELLS UNIVERSITY 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2 kg block is placed on a horizontal surface. If the coefficient of static friction between the block and the surface is 0.5, calculate the maximum force that can be applied to the block without cau\sing it to move.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 2
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°, what is the angle of re\fraction?
A. 20°
B. 22°
C. 25°
D. 28°
Question 3
A capacitor consists of two parallel plates, each of area $A$ and separation $d$. The capacitor is charged to a potential difference $V$ and then disconnected from the power source. If the plates are then brought together to a separation of $d/2$, what is the new potential difference $V_{new}$?
A. \frac{V}{2}
B. \frac{3V}{2}
C. \frac{V}{4}
D. \frac{3V}{4}
Question 4
A ray of light passes from air into a glass slab of re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 30°
C. 40°
D. 50°
Question 5
A 100 W light bulb is connected to a 220 V power source. If the resis\tance of the bulb is 10 Ω, what is the current flowing through the bulb?
A. 0.5 A
B. 1 A
C. 2 A
D. 4 A
Question 6
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 12 V. If the dis\tance between the plates is doubled, what is the new capaci\tance?
A. 5 μF
B. 10 μF
C. 20 μF
D. 40 μF
Question 7
A 2 kg block is attached to a horizontal spring with a force cons\tant of 100 N/m. The block is displaced by 0.1 m from its equilibrium position and released from rest. What is the maximum speed of the block?
A. 0.2 m/s
B. 0.3 m/s
C. 0.5 m/s
D. 0.6 m/s
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 subjected to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 9
A parallel plate capacitor consists of two plates, each of area $A$ and separation $d$. The capacitor is charged to a potential difference $V$ and then disconnected from the power source. If the plates are then brought together to a separation of $d/2$, what is the new capaci\tance $C_{new}$?
A. \frac{C}{2}
B. \frac{3C}{2}
C. \frac{C}{4}
D. \frac{3C}{4}
Question 10
A uniform magnetic field of strength 2 T is applied to a coil of wire with 100 turns. The coil has a radius of 0.05 m and a resis\tance of 5 Ω. If the current in the coil is 2 A, what is the induced emf?
A. 0.1 V
B. 0.2 V
C. 0.5 V
D. 1 V
Question 11
A 1000 W heater is used to heat water in a container. If the heater operates at 80% efficiency, calculate the power input to the heater.
A. 800 W
B. 1000 W
C. 1200 W
D. 1500 W
Question 12
A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. It is displaced by 0.5 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the angular frequency of the particle's motion.
A. \( \omega = \sqrt{\frac{k}{m}} \)
B. \( \omega = \sqrt{\frac{m}{k}} \)
C. \( \omega = \sqrt{\frac{k}{m^2}} \)
D. \( \omega = \sqrt{\frac{m^2}{k}} \)
Question 13
A gas at a pressure of 1 atm and temperature of 300 K is compressed to a volume of 0.1 L. Assuming the gas behaves ideally, calculate the final pressure of the gas.
A. \( P_1 V_1 = P_2 V_2 \)
B. \( P_1 V_2 = P_2 V_1 \)
C. \( P_2 = \frac{P_1 V_1}{V_2} \)
D. \( P_2 = \frac{V_2}{P_1 V_1} \)
Question 14
A 2 kg object is moving in a straight line with a velocity of 4 m/s. If a force of 10 N is applied in the same direction, what is the acceleration?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 15
A 2 kg object is moving in a circular path with a cons\tant speed of 4 m/s. If the radius of the path is doubled, what is the new speed of the object?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s

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