POST UTME NILE UNIVERSITY 2017 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A particle of mass 2 kg is attached to a spring with spring cons\tant 100 N/m. The particle is displaced by 0.2 m from its equilibrium position and released from rest. What is the angular frequency of the simple harmonic motion?
A. 5 rad/s
B. 10 rad/s
C. 15 rad/s
D. 20 rad/s
Question 2
A particle of mass 0.5 kg is moving with an initial velocity of 5 m/s. If it experiences a cons\tant force of 10 N, what is its acceleration?
A. 2 m/s^2
B. 5 m/s^2
C. 10 m/s^2
D. 20 m/s^2
Question 3
A particle of mass $m$ is moving in a circular orbit of radius $R$ around a fixed point $O$. If the particle's speed is $v$, what is the magnitude of the centripetal force acting on it?
A. \( \frac{mv^2}{R} \)
B. \( \frac{mv^2}{R^2} \)
C. \( \frac{mv^2}{R^3} \)
D. \( \frac{mv^2}{R^4} \)
Question 4
A 10 mH inductor is connected in series with a 20 Ω resistor and a 50 V battery. If the initial current is 0 A, find the current after 0.05 s.
A. 1.0 A
B. 1.5 A
C. 2.0 A
D. 2.5 A
Question 5
A light ray is incident on a prism at an angle of 30°. If the re\fractive index of the prism is 1.5, calculate the angle of deviation.
A. 10°
B. 20°
C. 30°
D. 40°
Question 6
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. The capaci\tance is 8 nF. If a potential difference of 10 V is applied across the plates, what is the magnitude of the electric field between the plates?
A. 2.5 x 10^5 V/m
B. 5 x 10^5 V/m
C. 1 x 10^6 V/m
D. 2 x 10^6 V/m
Question 7
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. Calculate the magnitude of the force acting on the particle.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 8
A 2.0 mH inductor is connected in series with a 3.0 kΩ resistor and a 9.0 V battery. If the switch is closed at $t=0$, what is the current in the circuit at $t=0.10$ s?
A. ( 0.10 A )
B. ( 0.20 A )
C. ( 0.30 A )
D. ( 0.40 A )
Question 9
A 10 Ω resistor is connected in series with a 20 V battery. If the current is 0.5 A, find the power dissipated by the resistor.
A. 5 W
B. 10 W
C. 15 W
D. 20 W
Question 10
A 2.5 μF capacitor is connected in parallel with a 5 kΩ resistor. If the voltage across the capacitor is 50 V, find the charge on the capacitor.
A. 0.25 μC
B. 0.5 μC
C. 0.75 μC
D. 1.0 μC
Question 11
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 uniform magnetic field of 2 T, what is the magnitude of the magnetic force acting on the particle?
A. 0.8 N
B. 1.2 N
C. 1.6 N
D. 2.4 N
Question 12
A wave has a frequency of 200 Hz and a wavelength of 0.5 m. Calculate the speed of the wave.
A. 100 m/s
B. 200 m/s
C. 300 m/s
D. 400 m/s
Question 13
A photon of wavelength 400 nm is incident on a metal surface. If the work function of the metal is 2.5 eV, what is the maximum kinetic energy of the emitted electron?
A. 1.25 eV
B. 2.5 eV
C. 3.75 eV
D. 5.0 eV
Question 14
A uniform magnetic field of strength 2.0 T is applied to a current-carrying wire of length 0.5 m. If the current in the wire is 5.0 A, what is the magnitude of the force experienced by the wire?
A. 0.25 N
B. 0.5 N
C. 1.0 N
D. 2.0 N
Question 15
A sound wave has a frequency of 200 Hz and a wavelength of 0.5 m. What is the speed of the sound wave?
A. 100 m/s
B. 200 m/s
C. 300 m/s
D. 400 m/s

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