POST UTME UNN 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A capacitor consists of two parallel plates, each with an area of 0.1 m^2. The dis\tance between the plates is 0.01 m. If the capaci\tance is 10 nF, what is the charge on the plates when a potential difference of 5 V is applied?
A. 0.05 C
B. 0.10 C
C. 0.15 C
D. 0.20 C
Question 2
A radioactive sample has a half-life of 5 years. If the initial activity is 100 Bq, what is the activity after 10 years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 3
A heat engine operates between two temperatures, 300 K and 400 K. If the efficiency of the engine is 30%, what is the work done by the engine per cycle?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 4
A wave of frequency 100 Hz and amplitude 2 m is traveling through a medium with a speed of 300 m/s. If the wave is reflected from a fixed \end, what is the magnitude of the displacement of the wave at the fixed \end?
A. 0 m
B. 1 m
C. 2 m
D. 3 m
Question 5
A capacitor of capaci\tance 10 μF is connected in series with a resistor of resis\tance 20 Ω. If a voltage of 50 V is applied across the circuit, what is the current flowing through the circuit?
A. 0.25 A
B. 0.5 A
C. 1 A
D. 2 A
Question 6
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 7
A 10 μC charge is placed at the center of a circular loop of radius 0.2 m. If the loop has a resis\tance of 5 Ω, what is the magnitude of the current induced in the loop?
A. 0.02 A
B. 0.04 A
C. 0.06 A
D. 0.08 A
Question 8
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. Calculate the current flowing through the circuit.
A. 1.5 A
B. 2 A
C. 2.5 A
D. 3 A
Question 9
A gas is enclosed in a container of volume 2.5 liters at a temperature of 300 K. If the temperature is increased to 400 K, what is the new volume of the gas, assuming the gas obeys Charles' Law?
A. 3.125 liters
B. 4.0 liters
C. 5.0 liters
D. 6.25 liters
Question 10
A sound wave has a frequency of 200 Hz and a wavelength of 0.5 m. What is the speed of the sound wave?
A. 100 m/s
B. 200 m/s
C. 300 m/s
D. 400 m/s
Question 11
A lens of focal length 20 cm forms an image of an object 30 cm away. Calculate the magnification of the lens.
A. -0.5
B. -0.6
C. -0.7
D. -0.8
Question 12
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. 4.0 m
B. 5.0 m
C. 6.0 m
D. 7.0 m
Question 13
A simple harmonic motion has a frequency of 10 Hz and an amplitude of 5 m. What is the maximum acceleration of the motion?
A. 10 m/s^2
B. 20 m/s^2
C. 30 m/s^2
D. 40 m/s^2
Question 14
A coil of wire of resis\tance 5 Ω is connected to a battery of voltage 9 V. Calculate the current flowing through the coil.
A. 1.5 A
B. 2.5 A
C. 3.5 A
D. 4.5 A
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 acceleration due to gravity is 9.8 m/s², calculate the time taken for the particle to reach its maximum height.
A. 3 s
B. 4 s
C. 5 s
D. 6 s

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