POST UTME CHRISTOPHER UNIVERSITY 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A lens of focal length 20 cm forms an image of an object at a dis\tance of 30 cm. What is the magnification of the lens?
A. -0.5
B. -0.6
C. -0.7
D. -0.8
Question 2
A particle of mass 1 kg is moving in a circular path with a radius of 2 m. If the particle has a speed of 4 m/s, calculate the centripetal force acting on the particle.
A. 20 N
B. 40 N
C. 60 N
D. 80 N
Question 3
A ray of light passes from air into a glass slab of re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 18°
B. 20°
C. 22°
D. 24°
Question 4
A gas expands from an initial volume of 0.1 m³ to a final volume of 0.5 m³ at a cons\tant temperature of 300 K. Calculate the work done by the gas.
A. -15 J
B. -10 J
C. -5 J
D. 0 J
Question 5
A wave has a frequency of 50 Hz and a wavelength of 10 m. Calculate the speed of the wave.
A. 500 m/s
B. 1000 m/s
C. 1500 m/s
D. 2000 m/s
Question 6
A capacitor of capaci\tance 20 μF is connected in parallel to a resistor of resis\tance 100 Ω. If a voltage of 10 V is applied across the circuit, calculate the current flowing through the resistor.
A. 0.1 A
B. 0.2 A
C. 0.5 A
D. 1 A
Question 7
A parallel plate capacitor has a capaci\tance of 2.5 μF. If a potential difference of 10 V is applied across the plates, calculate the charge stored on each plate.
A. 25 μC
B. 50 μC
C. 75 μC
D. 100 μC
Question 8
A particle of mass 2 kg is moving in a circular path with a cons\tant speed of 4 m/s. If the radius of the path is 3 m, what is the magnitude of the centripetal acceleration?
A. 6 m/s^2
B. 8 m/s^2
C. 10 m/s^2
D. 12 m/s^2
Question 9
A gas is confined to a cylinder of volume 2 m^3 at a temperature of 300 K. If the gas is heated to a temperature of 400 K, what is the new volume of the gas?
A. 2.5 m^3
B. 3 m^3
C. 3.5 m^3
D. 4 m^3
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. If the particle is subjected to a centripetal acceleration of 2 m/s^2, what is the force exerted on the particle?
A. 10 N
B. 12 N
C. 15 N
D. 20 N
Question 11
A 50 Ω resistor is connected in parallel with a 100 Ω resistor. If a voltage of 10 V is applied across the combination, what is the current in the 50 Ω resistor?
A. 0.2 A
B. 0.4 A
C. 0.6 A
D. 0.8 A
Question 12
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 subject 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 13
A block of mass 5 kg is attached to a horizontal spring with a force cons\tant of 200 N/m. The block is displaced by 2 m from its equilibrium position and released from rest. Calculate the maximum speed of the block.
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 14
A 10 μF capacitor is connected in series with a 20 Ω resistor and a 5 V battery. If the switch is closed at time t = 0, what is the current in the circuit at time t = 2 s?
A. 0.1 A
B. 0.2 A
C. 0.3 A
D. 0.4 A
Question 15
A heat engine operates between the temperatures 500 K and 300 K. If the engine produces 100 J of work per cycle, what is the efficiency of the engine?
A. 0.2
B. 0.3
C. 0.4
D. 0.5

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