POST UTME ACHIEVERS UNIVERSITY 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If the acceleration due to gravity is 9.8 m/s^2, what is the maximum height reached by the projectile?
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Question 2
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 angular velocity of the particle?
A. 2 rad/s
B. 4 rad/s
C. 6 rad/s
D. 8 rad/s
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 acceleration of 2 m/s^2, what is the magnitude of the force acting on the particle?
A. 8 N
B. 10 N
C. 12 N
D. 16 N
Question 4
A gas is contained in a cylinder of volume 2 m^3 at a pressure of 100 kPa. If the temperature of the gas is increased by 20 K, what is the new pressure of the gas?
A. 120 kPa
B. 140 kPa
C. 160 kPa
D. 180 kPa
Question 5
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. Calculate the magnitude of the force acting on the particle.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
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. What is the magnitude of the net force acting on the particle?
A. 8 N
B. 12 N
C. 16 N
D. 20 N
Question 7
A 100 W bulb is connected to a 200 V AC supply. Calculate the current flowing through the bulb.
A. 0.5 A
B. 1 A
C. 1.5 A
D. 2 A
Question 8
A vector has a magnitude of 5 units and makes an angle of 30° with the positive x-axis. If the vector is rotated by 60° in the counterclockwise direction, what is the new magnitude of the vector?
A. 5 units
B. 6 units
C. 7 units
D. 8 units
Question 9
A light ray passes from air into a glass 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 10
A heat engine operates between two temperatures of 500 K and 300 K. If the engine has an efficiency of 30%, what is the magnitude of the work done by the engine?
A. 1000 J
B. 2000 J
C. 3000 J
D. 4000 J
Question 11
A capacitor of capaci\tance 20 μF is connected in parallel with a resistor of resis\tance 30 Ω. If a voltage of 100 V is applied across the circuit, what is the current flowing through the circuit?
A. 3.33 A
B. 6.67 A
C. 10 A
D. 13.33 A
Question 12
A capacitor consists of two parallel plates, each of area 0.1 m^2, separated by a dis\tance of 0.01 m. If the capaci\tance is 10^-6 F, what is the charge stored on the capacitor when a potential difference of 10 V is applied across it?
A. 10^-7 C
B. 10^-6 C
C. 10^-5 C
D. 10^-4 C
Question 13
A 100 W light bulb is connected to a 220 V power source. What is the current drawn by the bulb?
A. 0.4 A
B. 0.5 A
C. 0.6 A
D. 0.7 A
Question 14
A gas is heated from 300 K to 400 K. If the initial volume of the gas is 2 m^3 and the final volume is 3 m^3, what is the magnitude of the work done on the gas?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 15
A spring with a spring cons\tant $k$ is stretched by a dis\tance $x$ from its equilibrium position. The work done in stretching the spring is given by $W = \frac{1}{2}kx^2$. If the spring cons\tant is doubled and the dis\tance stretched is halved, what is the new work done?
A. The work done is halved
B. The work done is doubled
C. The work done remains the same
D. The work done is quadrupled

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