POST UTME NILE UNIVERSITY 2023 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A circuit consists of a 12 V battery, a 4 Ω resistor, and an inductor with induc\tance 0.5 H. If the circuit is closed at t = 0, what is the current in the circuit at t = 2 s?
A. 2 A
B. 1.5 A
C. 2.5 A
D. 1 A
Question 2
A capacitor consists of two parallel plates, each of area 0.1 m^2, separated by a dis\tance of 0.01 m. If the capaci\tance is 10^-6 F, what is the magnitude of the electric field between the plates when a potential difference of 10 V is applied?
A. 1000 V/m
B. 2000 V/m
C. 3000 V/m
D. 4000 V/m
Question 3
A particle of mass $m$ is moving in a circular orbit of radius $R$ under the influence of a central force given by $F(r) = \frac{k}{r^2}$, where $k$ is a cons\tant. If the particle's speed is $v$, what is the magnitude of the force acting on it?
A. \frac{mv^2}{R}
B. \frac{k}{R}
C. \frac{mv^2}{R^2}
D. \frac{k}{R^2}
Question 4
A wave with a frequency of 50 Hz and a wavelength of 0.1 m is traveling through a medium. If the wave is reflected from a fixed \end, what is the magnitude of the displacement of the wave at the fixed \end?
A. 0.01 m
B. 0.02 m
C. 0.03 m
D. 0.04 m
Question 5
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°, calculate the angle of re\fraction.
A. 20°
B. 30°
C. 40°
D. 50°
Question 6
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. 10 m/s^2
B. 12 m/s^2
C. 15 m/s^2
D. 20 m/s^2
Question 7
A 10 kg block is moving in a circular path of radius 4 m with a cons\tant speed of 5 m/s. What is the magnitude of the centripetal force acting on the block?
A. 50 N
B. 62.5 N
C. 75 N
D. 100 N
Question 8
A particle of mass $m$ is placed on a frictionless surface and attached to a spring with spring cons\tant $k$. If the particle is displaced by a dis\tance $x$ from its equilibrium position and released from rest, what is the force exerted on the particle by the spring?
A. \( F = -kx \)
B. \( F = kx \)
C. \( F = \frac{kx}{m} \)
D. \( F = \frac{m}{kx} \)
Question 9
A 1000 W heater is connected to a 220 V power source. What is the current flowing through the heater?
A. 3 A
B. 4 A
C. 4.55 A
D. 5 A
Question 10
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. If the air resis\tance is negligible, what is the maximum height reached by the projectile?
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Question 11
A vector $mathbf{A}$ has components $A_x = 2$ and $A_y = 3$. If $mathbf{A}$ is rotated by an angle $\theta$ about the $z$-axis, what is the new $x$-component of $mathbf{A}$?
A. \( A_x' = 2 \cos \theta + 3 \sin \theta \)
B. \( A_x' = 2 \sin \theta + 3 \cos \theta \)
C. \( A_x' = 2 \cos \theta - 3 \sin \theta \)
D. \( A_x' = 2 \sin \theta - 3 \cos \theta \)
Question 12
A particle of mass 0.5 kg is attached to a spring with spring cons\tant 100 N/m. If the particle is displaced by 0.2 m from its equilibrium position and released from rest, what is its angular frequency?
A. 1.6 rad/s
B. 1.2 rad/s
C. 1.4 rad/s
D. 1.8 rad/s
Question 13
A particle of mass $m$ is attached to a spring with spring cons\tant $k$. If the particle is displaced by a dis\tance $x$ from its equilibrium position and released from rest, what is the angular frequency of the resulting simple harmonic motion?
A. \( omega = \sqrt{\frac{k}{m}} \)
B. \( omega = \sqrt{\frac{m}{k}} \)
C. \( omega = \frac{k}{m} \)
D. \( omega = \frac{m}{k} \)
Question 14
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 2.5 x 10^-10 F, what is the charge on the plates when the potential difference between them is 100 V?
A. 2.5 x 10^-8 C
B. 2.5 x 10^-7 C
C. 2.5 x 10^-9 C
D. 2.5 x 10^-6 C
Question 15
A beam of light passes through a prism and is re\fracted. If the angle of incidence is $30^\circ$ and the angle of re\fraction is $20^\circ$, what is the angle of deviation?
A. 10^\circ
B. 20^\circ
C. 30^\circ
D. 40^\circ

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: