POST UTME BSU 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A wave of frequency 50 Hz and wavelength 10 m is traveling through a medium. What is the speed of the wave?
A. 250 m/s
B. 500 m/s
C. 750 m/s
D. 1000 m/s
Question 2
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 2.5 x 10^-10 F, what is the charge on the plates when the potential difference between them is 100 V?
A. 0.25 C
B. 0.5 C
C. 1 C
D. 2 C
Question 3
A particle of mass $m$ is attached to a spring with spring cons\tant $k$. The particle is displaced from its equilibrium position by a dis\tance $x_0$ and released from rest. Assuming the motion is simple harmonic, find the angular frequency $omega$ of the particle's motion.
A. \sqrt{\frac{k}{m}}
B. \frac{k}{m}
C. \frac{m}{k}
D. \frac{1}{\sqrt{mk}}
Question 4
A beam of light passes through a prism and is re\fracted. If the angle of incidence is 30° and the angle of re\fraction is 20°, what is the angle of deviation?
A. 10°
B. 20°
C. 30°
D. 40°
Question 5
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 charge stored on each plate?
A. 50 μC
B. 100 μC
C. 200 μC
D. 500 μC
Question 6
A block of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.1 m from its equilibrium position, what is the force exerted by the spring?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 7
A circuit consists of a resistor $R$, an inductor $L$, and a capacitor $C$ connected in series. If the circuit is driven by an AC voltage source with frequency $f$, find the impedance $Z$ of the circuit.
A. \sqrt{R^2 + \( \omega L - \frac{1}{\omega C} \)^2}
B. \sqrt{R^2 + \( \omega C - \frac{1}{\omega L} \)^2}
C. \sqrt{\( \omega L - \frac{1}{\omega C} \)^2 + R^2}
D. \sqrt{\( \omega C - \frac{1}{\omega L} \)^2 + R^2}
Question 8
A body is at rest on a horizontal frictionless surface. A force of 20 N is applied to the body for 5 s. What is the velocity of the body after the force is removed?
A. 1 m/s
B. 2 m/s
C. 3 m/s
D. 4 m/s
Question 9
A particle of mass 0.5 kg is attached to a spring with a spring cons\tant of 100 N/m. It is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the angular frequency of the particle's motion.
A. 2\pi rad/s
B. 5\pi rad/s
C. 10\pi rad/s
D. 20\pi rad/s
Question 10
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle has a velocity of 4 m/s, what is the centripetal acceleration?
A. 0.5 m/s^2
B. 1 m/s^2
C. 2 m/s^2
D. 4 m/s^2
Question 11
A photon has an energy of 2.5 eV. If the wavelength of the photon is 500 nm, what is the momentum of the photon?
A. 1.5 x 10^-24 kg m/s
B. 3 x 10^-24 kg m/s
C. 4.5 x 10^-24 kg m/s
D. 6 x 10^-24 kg m/s
Question 12
A light ray passes from air into a glass of re\fractive index n = 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 30°
C. 40°
D. 50°
Question 13
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 centripetal force F_c = \( m * v^2 \) / r, what is the magnitude of the acceleration of the particle?
A. v^2 / r
B. v^2 * r
C. m * v^2 / r
D. m * v^2 / \( r^2 \)
Question 14
A light source is placed 2 m away from a convex lens of focal length f = 1 m. If the light source is moved 1 m closer to the lens, what is the new image dis\tance?
A. 3 m
B. 4 m
C. 5 m
D. 6 m
Question 15
A particle moves in a circular path with a radius of 2 m. If the particle completes one revolution in 4 s, calculate the angular velocity.
A. 0.5 rad/s
B. 1 rad/s
C. 1.5 rad/s
D. 2 rad/s

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