POST UTME AFE BABALOLA UNIVERSITY 2022 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A simple harmonic motion has a frequency of 20 Hz and an amplitude of 0.5 m. What is the angular frequency of the motion?
A. 20 \pi rad/s
B. 30 \pi rad/s
C. 40 \pi rad/s
D. 50 \pi rad/s
Question 2
A gas is contained in a cylinder of volume $V$ with a movable piston. The gas is heated, cau\sing its temperature to increase from $T_1$ to $T_2$. If the piston is allowed to move freely, what is the change in the internal energy of the gas?
A. nC_V \( T_2 - T_1 \)
B. nC_V T_2
C. nC_V T_1
D. nC_V \( T_2 + T_1 \)
Question 3
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 angle between the force and the radius vector at the ins\tant when the particle is at the top of its path?
A. 30°
B. 45°
C. 60°
D. 75°
Question 4
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. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 5
A radioactive sample decays from 100 g to 50 g in 10 years. What is the half-life of the sample?
A. 5 years
B. 10 years
C. 15 years
D. 20 years
Question 6
A body of mass 5 kg is moving in a straight line 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 7
A coil of wire has a resis\tance of 10 ohms and an induc\tance of 0.1 H. If a current of 2 A is passed through the coil, what is the magnitude of the induced emf?
A. 0.2 V
B. 0.4 V
C. 0.6 V
D. 0.8 V
Question 8
A block of mass 5 kg is placed on a frictionless surface and connected to a spring with a spring cons\tant of 200 N/m. If the block is displaced by 2 m from its equilibrium position and released from rest, 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 9
A beam of light is incident on a glass slab of thickness $t$ and re\fractive index $n$. If the angle of incidence is $\theta_i$, what is the angle of re\fraction?
A. \frac{n_1}{n_2} \theta_i
B. \frac{n_2}{n_1} \theta_i
C. \frac{n_1 + n_2}{n_1 - n_2} \theta_i
D. \frac{n_1 - n_2}{n_1 + n_2} \theta_i
Question 10
A current of 2 A flows through a resistor of 10 Ω. What is the power dissipated by the resistor?
A. 20 W
B. 40 W
C. 60 W
D. 80 W
Question 11
A wave has a frequency of 50 Hz and a wavelength of 2 m. If the wave is traveling in the positive x-direction, what is the direction of the particle velocity at x = 1 m?
A. Positive x-direction
B. Negative x-direction
C. Positive y-direction
D. Negative y-direction
Question 12
A parallel plate capacitor has a capaci\tance of 5 μF. If a potential difference of 10 V is applied across the plates, what is the energy stored in the capacitor?
A. 25 μJ
B. 50 μJ
C. 75 μJ
D. 100 μJ
Question 13
A simple harmonic motion has a period of 2 s and an amplitude of 3 m. If the motion is described by the equation x(t) = 3\cos(πt), what is the angular frequency of the motion?
A. π rad/s
B. 2π rad/s
C. 3π rad/s
D. 4π rad/s
Question 14
A wave with a frequency of 50 Hz and a wavelength of 2 m is traveling through a medium. If the wave is reflected from a fixed \end, what is the frequency of the reflected wave?
A. 25 Hz
B. 50 Hz
C. 75 Hz
D. 100 Hz
Question 15
A magnetic field of 0.5 T is directed along the z-axis. If a current of 2 A is flowing in a wire loop of radius 0.1 m, what is the magnitude of the magnetic moment of the loop?
A. 0.1 A m^2
B. 0.2 A m^2
C. 0.3 A m^2
D. 0.4 A m^2

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