POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2017 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A circuit consists of a resistor \( R = 10 , Omega \) and an inductor \( L = 20 , \text{H} \) connected in series. The circuit is driven by a voltage source of \( V = 20 , \text{V} \) with a frequency of \( f = 50 , \text{Hz} \). Find the impedance of the circuit.
A. 15 Ω
B. 20 Ω
C. 25 Ω
D. 30 Ω
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 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 3
A beam of light is incident on a glass slab at an angle of 30°. If the re\fractive index of the glass is 1.5, calculate the angle of re\fraction.
A. 20°
B. 25°
C. 30°
D. 35°
Question 4
A parallel plate capacitor has plates of area 0.04 m^2, separated by a dis\tance of 0.02 m. The capaci\tance is 2.5 nF. If the potential difference between the plates is 10 V, what is the charge on the positive plate?
A. 6.25 \u00b5 C
B. 12.5 \u00b5 C
C. 25 \u00b5 C
D. 50 \u00b5 C
Question 5
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 6
A particle of mass 2.0 kg is moving in a circular path of radius 3.0 m with a speed of 4.0 m/s. If the particle is subjected to a centripetal force of 10 N, calculate the time taken by the particle to complete one revolution.
A. 2.0 s
B. 4.0 s
C. 6.0 s
D. 8.0 s
Question 7
A circuit consists of a resistor $R$, an inductor $L$, and a capacitor $C$ connected in series. If the circuit is driven by a voltage source of frequency $f$, what is the impedance of the circuit?
A. \sqrt{R^2 + \( \omega L - \frac{1}{\omega C} \)^2}
B. \sqrt{R^2 + \( \omega L + \frac{1}{\omega C} \)^2}
C. \sqrt{R^2 + \( \omega L - \frac{1}{\omega C} \)^2}
D. \sqrt{R^2 + \( \omega L + \frac{1}{\omega C} \)^2}
Question 8
A radioactive sample has a half-life of 10 years. If the initial activity of the sample is 1000 Bq, calculate the activity of the sample after 20 years.
A. 125 Bq
B. 250 Bq
C. 500 Bq
D. 1000 Bq
Question 9
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial pressure is 2 atm, what is the final pressure?
A. 2.5 atm
B. 3 atm
C. 4 atm
D. 5 atm
Question 10
A coil of wire has an induc\tance of $L$ and a resis\tance of $R$. If a current of $I$ flows through it, what is the energy stored in the coil?
A. \frac{1}{2}LI^2
B. \frac{1}{2}RI^2
C. \frac{1}{2}LRI
D. \frac{1}{2}L^2I^2
Question 11
A 10 kg block is moving with a velocity of 5 m/s. If a force of 20 N is applied to the block, what is the acceleration of the block?
A. 0.5 m/s^2
B. 1.0 m/s^2
C. 2.0 m/s^2
D. 5.0 m/s^2
Question 12
A 1000-turn coil of wire is placed in a magnetic field of strength 0.5 T. If the coil is rotated through an angle of 90°, what is the induced emf?
A. 250 V
B. 500 V
C. 750 V
D. 1000 V
Question 13
A 100 V, 50 Hz AC supply is connected across a 20 Ω resistor. What is the rms value of the current flowing through the resistor?
A. 1 A
B. 2 A
C. 5 A
D. 10 A
Question 14
A sound wave of frequency 200 Hz is traveling through a medium with a speed of 340 m/s. What is the wavelength of the sound wave?
A. 1.7 m
B. 1.8 m
C. 1.9 m
D. 2 m
Question 15
A convex lens of focal length 20 cm is used to form an image of an object placed 30 cm away from the lens. What is the magnification of the image?
A. 0.5
B. 1
C. 2
D. 3

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