POST UTME BELLS UNIVERSITY 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A body of mass 5 kg is moving with a velocity of 10 m/s. If the body 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 2
A particle of mass 2.0 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.5 m from its equilibrium position and released from rest, what is the maximum speed of the particle?
A. 1.0 m/s
B. 2.0 m/s
C. 3.0 m/s
D. 4.0 m/s
Question 3
A 100 W light bulb is connected to a 220 V power source. If the bulb is used for 5 hours a day, how much electricity will it consume in a month?
A. 120 kWh
B. 150 kWh
C. 180 kWh
D. 200 kWh
Question 4
A particle of mass $m$ is moving in a circular path of radius $r$ with a cons\tant speed $v$. The particle is subject to a centripetal force $F_c$ given by $F_c = \frac{mv^2}{r}$. If the particle's speed is doubled, what is the new centripetal force $F_c'$?
A. \frac{2mv^2}{r}
B. \frac{mv^2}{2r}
C. \frac{mv^2}{r}
D. \frac{mv^2}{4r}
Question 5
A sound wave of frequency $f$ is traveling through a medium with a speed $v$. The wave has an amplitude $A$ and a wavelength $\lambda$. What is the period of the wave?
A. \frac{2\pi}{f}
B. \frac{v}{f}
C. \frac{\lambda}{v}
D. \frac{v}{\lambda}
Question 6
A magnetic field is created by a current-carrying wire. What is the direction of the magnetic field at a point 2 meters away from the wire?
A. The magnetic field points towards the wire.
B. The magnetic field points away from the wire.
C. The magnetic field is perp\endicular to the wire.
D. The magnetic field is parallel to the wire.
Question 7
A 5 kg block is attached to a horizontal spring with a force cons\tant of 100 N/m. If the block is displaced by 2 m from its equilibrium position and released, what is the maximum speed of the block?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 8
A particle of mass 1 kg is moving in a straight line with a velocity of 5 m/s. If it is subjected to a force of 10 N, what will be its acceleration?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 9
A resistor of resis\tance $R$ is connected in series with an inductor of induc\tance $L$. The circuit is driven by a \sinusoidal voltage source of amplitude $V_0$ and frequency $f$. What is the impedance of the circuit?
A. R
B. \sqrt{R^2 + \( \omega L \)^2}
C. \frac{R}{\omega L}
D. \frac{\omega L}{R}
Question 10
A 100 W light bulb is connected to a 220 V power source. What is the current drawn by the bulb?
A. 0.45 A
B. 0.5 A
C. 0.55 A
D. 0.6 A
Question 11
A circuit consists of a resistor $R$, an inductor $L$, and a capacitor $C$ connected in series. The circuit is driven by a voltage source $V$ with a frequency $f$. If the impedance $Z$ of the circuit is given by $Z = \sqrt{R^2 + \( \omega L - \frac{1}{\omega C} \)^2}$, what is the phase angle $\phi$ between the current $I$ and the voltage $V$?
A. \arc\tan\( \frac{\omega L - \frac{1}{\omega C}}{R} \)
B. \arc\tan\( \frac{R}{\omega L - \frac{1}{\omega C}} \)
C. \arc\tan\( \frac{\omega L + \frac{1}{\omega C}}{R} \)
D. \arc\tan\( \frac{R}{\omega L + \frac{1}{\omega C}} \)
Question 12
A magnetic field of magnitude $B$ is directed perp\endicular to the plane of a circular loop of radius $r$. The loop is made of a material with a magnetic susceptibility of $\chi$. What is the magnetic moment of the loop?
A. \frac{\pi r^2 B}{\mu_0}
B. \chi \frac{\pi r^2 B}{\mu_0}
C. \frac{\chi \pi r^2 B}{\mu_0}
D. \frac{\pi r^2 B}{\mu_0 \chi}
Question 13
A parallel-plate capacitor has a capaci\tance of 5.0 μF. If the potential difference between the plates is increased from 10 V to 20 V, what is the new charge on the plates?
A. 10 μC
B. 20 μC
C. 30 μC
D. 40 μC
Question 14
A \tank is filled with water to a height $h$. The pressure at the bottom of the \tank is given by $P = \rho gh$, where $\rho$ is the density of water and $g$ is the acceleration due to gravity. If the density of water is $\rho = 1000 \text{ kg/m}^3$ and the acceleration due to gravity is $g = 9.8 \text{ m/s}^2$, what is the pressure at the bottom of the \tank?
A. 9800 \text{ Pa}
B. 10000 \text{ Pa}
C. 98000 \text{ Pa}
D. 100000 \text{ Pa}
Question 15
A photon has a wavelength of 500 nanometers. What is its energy?
A. 2.48 eV
B. 4.96 eV
C. 6.42 eV
D. 8.28 eV

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