POST UTME UNILAG 2022 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 100 V AC supply is connected across a 20 Ω resistor. If the frequency of the AC supply is 50 Hz, what is the rms value of the current?
A. 2.5 A
B. 5.0 A
C. 7.5 A
D. 10.0 A
Question 2
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. If the current in the circuit is 1.5 A, determine the power dissipated in the 6 Ω resistor.
A. 4.5 W
B. 6.0 W
C. 7.2 W
D. 9.0 W
Question 3
A 50 W light bulb is connected across a 230 V AC supply. If the power factor is 0.8, what is the current drawn?
A. 0.25 A
B. 0.5 A
C. 0.75 A
D. 1.0 A
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 angle between the force and the radius vector?
A. 30°
B. 45°
C. 60°
D. 90°
Question 5
A simple harmonic oscillator has a frequency of 2 Hz and an amplitude of 5 cm. If the oscillator is displaced from its equilibrium position by 2 cm, determine the maximum acceleration.
A. 0.2 m/s^2
B. 0.4 m/s^2
C. 0.6 m/s^2
D. 0.8 m/s^2
Question 6
A convex lens of focal length 20 cm forms an image of an object placed 30 cm in front of it. If the object is moved 10 cm closer to the lens, what is the new image dis\tance?
A. 15 cm
B. 20 cm
C. 25 cm
D. 30 cm
Question 7
A particle of mass 2 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 total energy of the particle at time t = 0.
A. 10 J
B. 20 J
C. 30 J
D. 40 J
Question 8
A body of mass 5 kg is at rest on a horizontal surface. A force of 10 N is applied to it for 2 s. What is the velocity of the body after the force is removed?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 9
A 5 Ω resistor is connected in parallel with a 10 Ω resistor. What is the equivalent resis\tance of the circuit?
A. 3.33 Ω
B. 4.17 Ω
C. 5.00 Ω
D. 6.25 Ω
Question 10
A radioactive sample decays from 100 g to 50 g in 10 days. What is the half-life of the sample?
A. 5 days
B. 10 days
C. 15 days
D. 20 days
Question 11
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. What is the maximum height reached by the projectile?
A. 5 m
B. 10 m
C. 15 m
D. 20 m
Question 12
A particle of mass 2 kg is moving in a circular path of radius 3 m with a speed of 4 m/s. What is the magnitude of the centripetal force?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 13
A coil of induc\tance 50 mH is connected to a 12 V battery. Calculate the energy stored in the coil.
A. 1.5 J
B. 2.5 J
C. 3.5 J
D. 4.5 J
Question 14
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. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 15
A particle of mass 2 kg is projected from the origin with an initial velocity of 10 m/s at an angle of 60° to the horizontal. If the particle is subject to a uniform gravitational field of 9.8 m/s^2, determine the time of flight.
A. 4.0 s
B. 5.0 s
C. 6.0 s
D. 7.0 s

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