POST UTME NILE UNIVERSITY 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 100 W light bulb is connected to a 230 V AC source. Calculate the current drawn by the bulb.
A. 0.5 A
B. 1 A
C. 2 A
D. 4 A
Question 2
A current of $I$ flows through a wire of resis\tance $R$. If the wire is heated for a time $t$, what is the energy dissipated?
A. I^2Rt
B. \frac{I^2Rt}{2}
C. I^2Rt
D. \frac{I^2Rt}{2}
Question 3
A particle of mass 2 kg is moving in a circular path with a cons\tant speed of 4 m/s. If the radius of the circular path is 3 m, calculate the magnitude of the centripetal acceleration.
A. 4 m/s^2
B. 6 m/s^2
C. 8 m/s^2
D. 10 m/s^2
Question 4
A parallel plate capacitor has plates of area $A$ and separation $d$. If the capaci\tance is $C$, what is the value of the dielectric cons\tant $K$?
A. \frac{Cd}{\epsilon_0A}
B. \frac{\epsilon_0A}{Cd}
C. \frac{Cd}{\epsilon_0A}
D. \frac{\epsilon_0A}{Cd}
Question 5
A ray of light passes from air into a glass of re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 25°
C. 30°
D. 35°
Question 6
A sound wave with a frequency of 200 Hz and a speed of 340 m/s is traveling through a medium. If the wavelength is 1.7 m, find the amplitude of the wave.
A. 0.01 m
B. 0.1 m
C. 0.5 m
D. 1 m
Question 7
A body of mass 5 kg is moving with a velocity of 10 m/s. If it is subjected to a force of 20 N, what is the acceleration of the body?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 8
A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. It is displaced by 0.2 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. 5 rad/s
B. 10 rad/s
C. 20 rad/s
D. 50 rad/s
Question 9
A capacitor consists of two parallel plates, each of area 0.1 m^2, separated by a dis\tance of 0.01 m. The capaci\tance of the capacitor is 10^-6 F. What is the charge stored on the capacitor when a potential difference of 10 V is applied?
A. 10^-5 C
B. 10^-6 C
C. 10^-7 C
D. 10^-8 C
Question 10
A lens of focal length 20 cm is used to form an image of an object placed 30 cm from the lens. What is the magnification of the image?
A. -1
B. -2
C. -3
D. -4
Question 11
A particle of mass 1 kg is moving in a circular path with a cons\tant speed of 3 m/s. If the radius of the circular path is 2 m, calculate the magnitude of the centripetal force.
A. 3 N
B. 6 N
C. 9 N
D. 12 N
Question 12
A beam of light passes from air into a glass 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 13
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. 1.67
D. 2
Question 14
A body of mass 5 kg is moving with a velocity of 10 m/s. If it is subjected to a force of 20 N, what is the acceleration of the body?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 15
A ray of light passes from air into a glass block with a re\fractive index of 1.5. If the angle of incidence is 30°, calculate the angle of re\fraction.
A. 20°
B. 22°
C. 24°
D. 26°

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