POST UTME LEAD CITY UNIVERSITY 2019 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 100 μC charge is placed at the center of a circular coil of radius 0.1 m. What is the magnetic field at a point on the axis of the coil 0.2 m from the center?
A. 0.01 T
B. 0.02 T
C. 0.03 T
D. 0.04 T
Question 2
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. 30°
C. 40°
D. 50°
Question 3
A coil of wire has a resis\tance of $R$ and is connected to a battery of emf $\epsilon$. If the current in the coil is $I$, what is the power dissipated in the coil?
A. RI
B. \frac{RI}{\epsilon}
C. \frac{\epsilon^2}{R}
D. \frac{I^2R}{\epsilon}
Question 4
A 100 V, 50 Hz AC supply is connected to a series RLC circuit with R = 10 Ω, L = 0.1 H, and C = 10 μF. What is the impedance of the circuit?
A. 20 Ω
B. 30 Ω
C. 40 Ω
D. 50 Ω
Question 5
A particle of mass 1.0 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.2 m from its equilibrium position and released from rest, what is the maximum kinetic energy of the particle?
A. 0.2 J
B. 0.4 J
C. 0.6 J
D. 0.8 J
Question 6
A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. The particle 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. 15 rad/s
D. 20 rad/s
Question 7
A parallel plate capacitor has a capaci\tance of $C$ and is charged to a potential difference of $V$. If the dis\tance between the plates is increased by a factor of $n$, what is the new capaci\tance?
A. \frac{C}{n}
B. nC
C. \frac{nC}{V}
D. \frac{CV}{n}
Question 8
A wave with a frequency of 100 Hz and a wavelength of 2 m is traveling through a medium. If the speed of the wave is 320 m/s, calculate the amplitude of the wave.
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 9
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 20 V. If the dis\tance between the plates is doubled, what is the new capaci\tance?
A. 5.00 μF
B. 10.0 μF
C. 20.0 μF
D. 40.0 μF
Question 10
A circuit consists of a 12 V battery, a 4 Ω resistor, and an inductor with an induc\tance of 0.5 H. If the circuit is closed at time t = 0, calculate the current in the circuit at time t = 2 s.
A. 2 A
B. 4 A
C. 6 A
D. 8 A
Question 11
A capacitor consists of two parallel plates separated by a dis\tance $d$. If the capaci\tance is $C$ and the charge on the plates is $Q$, what is the electric field between the plates?
A. \frac{Q}{\epsilon_0 A}
B. \frac{Q}{d}
C. \frac{C}{\epsilon_0}
D. \frac{Q}{A}
Question 12
A sound wave with frequency $f$ is traveling through a medium with speed $v$. If the wavelength of the wave is $\lambda$, what is its period?
A. \frac{\lambda}{f}
B. \frac{v}{f}
C. \frac{\lambda}{v}
D. \frac{f}{v}
Question 13
A photon of energy $E$ is incident on a metal surface. If the work function of the metal is $\phi$, what is the maximum kinetic energy of the emitted electron?
A. E-\phi
B. E+\phi
C. \frac{E}{\phi}
D. \frac{\phi}{E}
Question 14
A 10 kg block is moving with a speed of 2 m/s on a horizontal, frictionless surface. If the block is subjected to a cons\tant horizontal force of 5 N, what is the acceleration of the block?
A. 0.5 m/s²
B. 1.0 m/s²
C. 1.5 m/s²
D. 2.0 m/s²
Question 15
A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 30 Ω resistor connected in series. If a voltage of 12 V is applied across the circuit, what is the current flowing through the 30 Ω resistor?
A. 0.2 A
B. 0.4 A
C. 0.6 A
D. 0.8 A

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