POST UTME BSU 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
A parallel plate capacitor with plates of area 0.04 m^2 and separation 0.02 m is charged to a potential difference of 10 V. If the capaci\tance is 2.5 x 10^-6 F, calculate the energy stored in the capacitor.
A. 1.25 x 10^-4 J
B. 2.5 x 10^-4 J
C. 5 x 10^-4 J
D. 10 x 10^-4 J
Question 3
A gas is heated from 300 K to 400 K. If the initial volume is 0.2 m^3, calculate the final volume of the gas.
A. 0.3 m^3
B. 0.4 m^3
C. 0.5 m^3
D. 0.6 m^3
Question 4
A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 5 Ω resistor connected in series. If a voltage of 12 V is applied across the circuit, calculate the current flowing through the circuit.
A. 0.4 A
B. 0.6 A
C. 0.8 A
D. 1 A
Question 5
A 5 kg block is attached to a horizontal spring with a spring cons\tant of 100 N/m. 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 6
A body is moving in a circular path with a radius of 0.5 m. If the body's speed is 2 m/s, calculate the centripetal 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 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 8
A ray of light passes from air into a glass slab of re\fractive index 1.5. If the angle of incidence is 30°, calculate the angle of re\fraction.
A. 20°
B. 30°
C. 40°
D. 50°
Question 9
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 10
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. What is the magnitude of the force acting on the particle?
A. 12 N
B. 24 N
C. 48 N
D. 96 N
Question 11
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 12
A current of 2 A flows through a resistor of 10 Ω. What is the power dissipated in the resistor?
A. 20 W
B. 40 W
C. 60 W
D. 80 W
Question 13
A magnetic field $B$ is produced by a current-carrying wire. If the wire is bent into a circular loop of radius $r$, find the magnetic field $B$ at the center of the loop.
A. \frac{\mu_0 I}{2r}
B. \frac{\mu_0 I}{r}
C. \frac{2\mu_0 I}{r}
D. \frac{\mu_0 I}{4r}
Question 14
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 15
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 / \( r^2 \)

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