POST UTME ACHIEVERS UNIVERSITY 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A particle of mass 2 kg is moving in a circular path of radius 3 m with a speed of 4 m/s. Calculate the magnitude of the centripetal force acting on the particle.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 2
A particle is moving in a circular path with a cons\tant speed of 5 m/s. If the radius of the circle is 2 m, what is the centripetal acceleration of the particle?
A. 10 m/s²
B. 20 m/s²
C. 30 m/s²
D. 40 m/s²
Question 3
A parallel plate capacitor consists of two plates, each of area 0.01 m^2, separated by a dis\tance of 0.001 m. The capacitor is charged to a potential difference of 10 V. Calculate the energy stored in the capacitor.
A. 0.1 J
B. 0.5 J
C. 1.0 J
D. 5.0 J
Question 4
A block of mass 5 kg is attached to a horizontal spring with a force cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position, what is the potential energy stored in the spring?
A. 1 J
B. 2 J
C. 3 J
D. 4 J
Question 5
A 2000 W heater is connected to a 220 V AC supply. Calculate the power factor of the heater.
A. 0.5
B. 0.7
C. 0.9
D. 1.0
Question 6
A wave has a frequency of 50 Hz and a wavelength of 2 m. If the wave is traveling in the positive x-direction, what is the direction of the wave's velocity?
A. Positive x-direction
B. Negative x-direction
C. Positive y-direction
D. Negative y-direction
Question 7
A 2.5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, calculate the maximum speed of the block as it passes through the equilibrium position.
A. 2.5 m/s
B. 5.0 m/s
C. 7.5 m/s
D. 10.0 m/s
Question 8
A 100 V AC supply is connected to a 50 Ω resistor. Calculate the rms value of the current flowing through the resistor.
A. 2 A
B. 4 A
C. 6 A
D. 8 A
Question 9
A magnetic field of 0.5 T is applied to a current-carrying wire of length 1 m. The current in the wire is 2 A. Calculate the force experienced by the wire.
A. 0.1 N
B. 0.5 N
C. 1.0 N
D. 5.0 N
Question 10
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 20 V. If the plates are separated by a dis\tance of 4 mm, what is the surface charge density on the plates?
A. 5 C/m^2
B. 10 C/m^2
C. 15 C/m^2
D. 20 C/m^2
Question 11
A heat engine operates between a high-temperature reservoir at 500 K and a low-temperature reservoir at 300 K. The engine has an efficiency of 30%. Calculate the maximum possible work output of the engine.
A. 100 J
B. 200 J
C. 300 J
D. 400 J
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 subjected to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?
A. 6 m/s^2
B. 12 m/s^2
C. 18 m/s^2
D. 24 m/s^2
Question 13
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. 16 m/s^2
B. 20 m/s^2
C. 24 m/s^2
D. 28 m/s^2
Question 14
A radioactive subs\tance has a half-life of 2 years. If 100 g of the subs\tance is initially present, how much of the subs\tance will remain after 6 years?
A. 12.5 g
B. 25 g
C. 50 g
D. 100 g
Question 15
A wave has a frequency of 100 Hz and a wavelength of 1 m. If the wave is traveling in the positive x-direction, what is the direction of the wave's velocity?
A. Positive x-direction
B. Negative x-direction
C. Positive y-direction
D. Negative y-direction

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