POST UTME BELLS UNIVERSITY 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A sound wave with a frequency of 200 Hz has a speed of 340 m/s. Calculate the wavelength of the sound wave.
A. 1.7 m
B. 1.7 cm
C. 1.7 km
D. 1.7 μm
Question 2
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
Question 3
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 4
A 50 Hz AC voltage source is connected to a 10 Ω resistor. Calculate the current flowing through the resistor.
A. 2 A
B. 5 A
C. 10 A
D. 20 A
Question 5
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 6
A light source is placed 2 m away from a convex lens of focal length 0.5 m. If the lens is 0.1 m thick, calculate the image dis\tance.
A. \( \frac{1}{f} = \frac{1}{d_o} + \frac{1}{d_i} \)
B. \( \frac{1}{d_i} = \frac{1}{f} - \frac{1}{d_o} \)
C. \( \frac{1}{d_i} = \frac{1}{f} + \frac{1}{d_o} \)
D. \( \frac{1}{d_i} = \frac{1}{f} - \frac{d_o}{d_i} \)
Question 7
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 8
A gas is heated from 300 K to 400 K at cons\tant volume. What is the ratio of the final pressure to the initial pressure?
A. 1.33
B. 1.5
C. 2
D. 3
Question 9
A force of 10 N is applied to an object, cau\sing it to accelerate at 2 m/s². What is the mass of the object?
A. 5 kg
B. 10 kg
C. 15 kg
D. 20 kg
Question 10
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 11
A particle of mass $m$ is moving in a circular path of radius $r$ with a cons\tant speed $v$. The particle experiences a centripetal force $F_c$ given by $F_c = \frac{mv^2}{r}$. If the particle's speed is doubled to $2v$, what is the new centripetal force $F_{c,new}$?
A. \frac{2mv^2}{r}
B. \frac{mv^2}{r}
C. \frac{4mv^2}{r}
D. \frac{mv^2}{2r}
Question 12
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 13
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 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 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

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