POST UTME UNIOSUN 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
A 10 V, 2 A current source is connected to a 4 Ω resistor in series with a 6 Ω resistor. What is the total resis\tance of the circuit?
A. 5 Ω
B. 6 Ω
C. 8 Ω
D. 10 Ω
Question 3
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 of the capacitor is 10^-6 F, what is the magnitude of the electric field between the plates when a charge of 5 x 10^-6 C is stored on each plate?
A. 500 V/m
B. 1000 V/m
C. 2000 V/m
D. 5000 V/m
Question 4
A simple harmonic motion has an amplitude of $A$ and a frequency of $f$. If the motion is damped by a force proportional to the velocity, what is the value of the damping coefficient $b$ in terms of $A$, $f$, and the angular frequency $\omega$?
A. \frac{\omega^2A}{f}
B. \frac{fA}{\omega^2}
C. \frac{\omega^2A}{f^2}
D. \frac{f^2A}{\omega^2}
Question 5
A gas expands from an initial volume of 0.1 m^3 to a final volume of 0.5 m^3 against an external pressure of 10^5 Pa. What is the work done by the gas?
A. 500 J
B. 1000 J
C. 2000 J
D. 5000 J
Question 6
A wave has a frequency of $f$ and a wavelength of $\lambda$. If the wave is traveling through a medium with speed $v$, what is the value of $v$ in terms of $f$ and $\lambda$?
A. f\lambda
B. \frac{f\lambda}{2}
C. \frac{2f\lambda}{1}
D. \frac{f\lambda}{4}
Question 7
A 100 V AC source is connected to a 50 Ω resistor. If the current is 2 A, calculate the power consumed by the resistor.
A. 200 W
B. 400 W
C. 600 W
D. 800 W
Question 8
A block of mass 5 kg is attached to a horizontal spring of force cons\tant 100 N/m. If the block is displaced by 2 m from its equilibrium position and released, calculate the maximum speed of the block.
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 9
A particle of mass 1 kg is moving in a circular orbit with radius 0.5 m and angular velocity 2 rad/s. What is the centripetal force acting on the particle?
A. 2 N
B. 4 N
C. 6 N
D. 8 N
Question 10
A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 50 V is applied across it, calculate the charge stored on the plates.
A. 0.5 C
B. 1 C
C. 1.5 C
D. 2 C
Question 11
A magnetic field of 0.5 T is directed perp\endicular to a current of 2 A. If the length of the conductor is 1 m, calculate the force experienced by the conductor.
A. 0.1 N
B. 0.2 N
C. 0.3 N
D. 0.4 N
Question 12
A gas is heated from 300 K to 400 K at cons\tant volume. Calculate the change in internal energy.
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 13
A uniform magnetic field of strength 2.0 T is directed along the z-axis. A current of 5.0 A flows through a straight wire of length 0.5 m, placed along the x-axis. What is the magnitude of the magnetic force on the wire?
A. 0.1 N
B. 0.2 N
C. 0.5 N
D. 1.0 N
Question 14
A sound wave with frequency 200 Hz and amplitude 0.05 m is traveling through a medium with speed 340 m/s. What is the intensity of the sound wave?
A. 10^{-4} W/m^2
B. 10^{-3} W/m^2
C. 10^{-2} W/m^2
D. 10^{-1} W/m^2
Question 15
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 path is 3 m, calculate the magnitude of the centripetal acceleration.
A. 4 m/s^2
B. 8 m/s^2
C. 12 m/s^2
D. 16 m/s^2

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