POST UTME LEAD CITY UNIVERSITY 2023 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 100 W light bulb is connected to a 220 V AC source. Determine the current drawn by the light bulb.
A. 0.5 A
B. 1 A
C. 1.5 A
D. 2 A
Question 2
A 100 W light bulb is connected to a 220 V power source. If the resis\tance of the light bulb is 50 Ω, what is the current flowing through the light bulb?
A. 0.5 A
B. 1 A
C. 2 A
D. 5 A
Question 3
A heat engine operates between two temperatures $T_1$ and $T_2$, where $T_1 > T_2$. The engine has an efficiency of $\eta = 1 - \frac{T_2}{T_1}$. What is the maximum possible efficiency of the engine?
A. 1 - \frac{T_2}{T_1}
B. 1 - \frac{T_1}{T_2}
C. \frac{T_1 - T_2}{T_1}
D. \frac{T_2 - T_1}{T_2}
Question 4
A capacitor consists of two parallel plates, each of area $A$, separated by a dis\tance $d$. The plates are charged to a potential difference $V$. What is the capaci\tance of the capacitor?
A. \frac{\epsilon_0 A}{d}
B. \frac{\epsilon_0 A}{2d}
C. \frac{2\epsilon_0 A}{d}
D. \frac{\epsilon_0 A}{2d^2}
Question 5
A gas is enclosed in a container with a movable piston. The gas is heated at cons\tant pressure, cau\sing its volume to increase. Which of the following statements is true about the change in internal energy of the gas?
A. The internal energy increases
B. The internal energy decreases
C. The internal energy remains cons\tant
D. The internal energy increases or decreases dep\ending on the specific gas
Question 6
A wave has a frequency of $f$ and a wavelength of $\lambda$. What is the speed of the wave?
A. f \lambda
B. \frac{f}{\lambda}
C. \frac{\lambda}{f}
D. f^2 \lambda^2
Question 7
A particle moves in a circular path with a cons\tant speed of 5 m/s. If the radius of the path is 2 m, determine the centripetal 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 8
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If the acceleration due to gravity is 9.8 m/s², what is the maximum height reached by the projectile?
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Question 9
A 5 kg block is moving with a velocity of 2 m/s on a frictionless surface. If a force of 10 N is applied to the block, 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 10
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. 6 m/s^2
B. 12 m/s^2
C. 18 m/s^2
D. 24 m/s^2
Question 11
A magnetic field is produced by a current-carrying wire. If the current is increased by a factor of $n$, what happens to the magnetic field?
A. Increases by a factor of $n$
B. Decreases by a factor of $n$
C. Increases by a factor of $n^2$
D. Decreases by a factor of $n^2$
Question 12
A 10 μF capacitor is connected in series with a 20 Ω resistor and a 120 V AC source. Determine the impedance of the circuit.
A. 15 Ω
B. 20 Ω
C. 25 Ω
D. 30 Ω
Question 13
A block of mass $m$ is attached to a horizontal spring with spring cons\tant $k$. If the block is displaced by a dis\tance $x$ and released from rest, what is its maximum velocity?
A. \sqrt{\frac{kx^2}{m}}
B. \sqrt{\frac{mx^2}{k}}
C. \sqrt{\frac{k}{mx^2}}
D. \sqrt{\frac{m}{kx^2}}
Question 14
A particle of mass 0.5 kg is moving in a circular path with a radius of 0.2 m. The particle has a speed of 2.0 m/s. What is the centripetal acceleration of the particle?
A. 0.5 m/s^2
B. 1.0 m/s^2
C. 1.5 m/s^2
D. 2.0 m/s^2
Question 15
A charged particle of mass 1.5 kg and charge 3 C is moving in a magnetic field of strength 2 T. If the particle is moving with a speed of 5 m/s, what is the magnitude of the force acting on the particle?
A. 0.15 N
B. 0.30 N
C. 0.45 N
D. 0.60 N

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