POST UTME AFE BABALOLA UNIVERSITY 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A beam of light passes from air into a glass of re\fractive index 1.5. If the angle of incidence is 30°, determine the angle of re\fraction.
A. 20°
B. 25°
C. 15°
D. 30°
Question 2
A ray of light passes from air into a glass slab of re\fractive index $\mu$. If the angle of incidence is $30^\circ$, what is the angle of re\fraction?
A. 20^\circ
B. 30^\circ
C. 40^\circ
D. 50^\circ
Question 3
A wave has a frequency of 50 Hz and a wavelength of 0.5 m. What is its speed?
A. 10 m/s
B. 20 m/s
C. 25 m/s
D. 30 m/s
Question 4
A light wave has a wavelength of 500 nm and a frequency of 6 x 10^14 Hz. Find the speed of the light wave.
A. 3 x 10^8 m/s
B. 3.5 x 10^8 m/s
C. 4 x 10^8 m/s
D. 4.5 x 10^8 m/s
Question 5
A block of mass $m$ is placed on a frictionless surface and attached to a horizontal spring of spring cons\tant $k$. If the block is displaced by a dis\tance $x$ from its equilibrium position and released, what is the magnitude of the force acting on the block at that ins\tant?
A. kx
B. \frac{kx}{m}
C. \frac{mx}{k}
D. \frac{km}{x}
Question 6
A particle of mass 2 kg is moving in a circular path of radius 3 m with a speed of 4 m/s. Find the magnitude of the force acting on the particle.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 7
A 100 W light bulb is connected to a 220 V power source. What is the current drawn by the bulb?
A. 0.4 A
B. 0.5 A
C. 0.6 A
D. 0.7 A
Question 8
A wave has a frequency of 50 Hz and a wavelength of 2 m. If the wave is traveling in a medium with a speed of 100 m/s, calculate the amplitude of the wave.
A. 0.05 m
B. 0.1 m
C. 0.2 m
D. 0.5 m
Question 9
A particle of mass $m$ is moving in a circular path of radius $R$ with a cons\tant speed $v$. If the particle is subjected to a uniform magnetic field of strength $B$, what is the magnitude of the magnetic force acting on the particle?
A. \frac{mv^2}{R}
B. \frac{mv}{R}
C. \frac{m}{vR}
D. \frac{v}{mR}
Question 10
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 0.2 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 11
A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. If a potential difference of 12 V is applied across the circuit, what is the current flowing through the 10 Ω resistor?
A. 0.2 A
B. 0.4 A
C. 0.6 A
D. 0.8 A
Question 12
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. 5.33 m/s^2
B. 6.67 m/s^2
C. 7.78 m/s^2
D. 8.89 m/s^2
Question 13
A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 5 V battery. U\sing Kirchhoff's voltage law, find the current through the 10 Ω resistor.
A. 0.25 A
B. 0.5 A
C. 1 A
D. 2 A
Question 14
A \tank contains 1000 kg of water at a temperature of 20°C. If 200 kg of water at 80°C is added to the \tank, what is the final temperature of the water in the \tank?
A. 22°C
B. 24°C
C. 26°C
D. 28°C
Question 15
A gas expands from 1 L to 2 L against a cons\tant external pressure of 2 atm. What is the work done?
A. 1 L atm
B. 2 L atm
C. 3 L atm
D. 4 L atm

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