POST UTME LAUTECH 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 1000 Hz AC voltage is applied across a circuit containing a 50 Ω resistor and a 200 μF capacitor in series. If the circuit is initially uncharged, what is the magnitude of the current in the circuit at t = 0?
A. 0 A
B. 0.5 A
C. 1 A
D. 2 A
Question 2
A sound wave with a frequency of 200 Hz is produced by a source moving towards a stationary observer. If the speed of sound in air is 343 m/s, what is the apparent frequency heard by the observer?
A. 220 Hz
B. 200 Hz
C. 180 Hz
D. 160 Hz
Question 3
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. 10 m/s^2
B. 12 m/s^2
C. 15 m/s^2
D. 20 m/s^2
Question 4
A radioactive sample has a half-life of 10 minutes. If the initial activity is 1000 Bq, what is the activity after 20 minutes?
A. 125 Bq
B. 250 Bq
C. 500 Bq
D. 1000 Bq
Question 5
A ray of light passes from air into a glass slab at an angle of incidence of 30 degrees. If the re\fractive index of the glass is 1.5, what is the angle of re\fraction?
A. 20 degrees
B. 25 degrees
C. 30 degrees
D. 35 degrees
Question 6
A capacitor consists of two parallel plates, each of area 0.01 m^2, separated by a dis\tance of 0.001 m. If the capaci\tance is 10 nF, what is the charge stored on the capacitor when a potential difference of 10 V is applied?
A. 10^-8 C
B. 10^-7 C
C. 10^-6 C
D. 10^-5 C
Question 7
A 50 kg block is pulled up a 20 m high incline at a cons\tant velocity. If the coefficient of kinetic friction is 0.2, what is the force of friction acting on the block?
A. 98 N
B. 100 N
C. 102 N
D. 105 N
Question 8
A gas at a pressure of 1 atm and temperature of 300 K is heated to a temperature of 400 K. What is the new pressure?
A. 2 atm
B. 4 atm
C. 8 atm
D. 16 atm
Question 9
A 2.5 V battery is connected in series with a 5 ohm resistor and a 10 ohm resistor. What is the total resis\tance in the circuit?
A. 10 ohm
B. 12.5 ohm
C. 15 ohm
D. 20 ohm
Question 10
A beam of light passes from air into a glass of re\fractive index 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 11
A 2000 Hz AC voltage is applied across a circuit containing a 20 Ω resistor and a 100 μF capacitor in parallel. If the circuit is initially uncharged, what is the magnitude of the current in the circuit at t = 0?
A. 0 A
B. 0.5 A
C. 1 A
D. 2 A
Question 12
A lens of focal length 20 cm is used to form an image of an object at a dis\tance of 30 cm. What is the magnification of the lens?
A. 0.5
B. 1
C. 2
D. 5
Question 13
A 5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. If the block is displaced by 2 m from its equilibrium position and released from rest, what is the magnitude of the acceleration of the block?
A. 5 m/s^2
B. 10 m/s^2
C. 15 m/s^2
D. 20 m/s^2
Question 14
A 5 Ω resistor is connected in series with a 10 V battery. If the internal resis\tance of the battery is 2 Ω, what is the current flowing through the circuit?
A. 0.5 A
B. 1 A
C. 2 A
D. 5 A
Question 15
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If air resis\tance is neglected, what is the maximum height reached by the projectile?
A. 10 m
B. 15 m
C. 20 m
D. 25 m

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