POST UTME JOSEPH AYO BABALOLA UNIVERSITY 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 5 μF capacitor is connected in parallel with a 10 μF capacitor. If a 120 V power source is connected across the combination, what is the equivalent capaci\tance?
A. 10 μF
B. 15 μF
C. 20 μF
D. 25 μF
Question 2
A radioactive sample of Δₗ emits Δₗα particles with a half-life of 5.27 years. If the initial activity of the sample is 120 Bq, calculate the activity after 10 years.
A. 60 Bq
B. 80 Bq
C. 100 Bq
D. 120 Bq
Question 3
A sound wave of frequency 200 Hz is traveling through a medium with a speed of 340 m/s. If the wave is reflected from a surface, what is the magnitude of the resulting s\tanding wave?
A. 400 Hz
B. 600 Hz
C. 800 Hz
D. 1000 Hz
Question 4
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° 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
Question 5
A 12 V battery is connected to a 4 Ω resistor in series with a 6 Ω resistor. Calculate the total resis\tance of the circuit.
A. 2 Ω
B. 4 Ω
C. 6 Ω
D. 10 Ω
Question 6
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 7
A radioactive sample decays at a rate of 0.05% per hour. If the initial mass of the sample is 100 g, what is the mass of the sample after 5 hours?
A. 90.25 g
B. 91.25 g
C. 92.25 g
D. 93.25 g
Question 8
A 100 μF capacitor is connected in series with a 50 Ω resistor. Calculate the resonant frequency of the circuit.
A. 100 Hz
B. 200 Hz
C. 500 Hz
D. 1000 Hz
Question 9
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. 10 N
B. 12 N
C. 8 N
D. 6 N
Question 10
A 2 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.5 m from its equilibrium position and released from rest. Find the maximum speed of the block.
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 11
A 5 kg block is susp\ended from a spring with a spring cons\tant of 200 N/m. If the block is displaced by 0.2 m from its equilibrium position, calculate the work done by the spring in bringing the block back to its equilibrium position.
A. 10 J
B. 20 J
C. 30 J
D. 40 J
Question 12
A convex lens of focal length 20 cm is used to form an image of an object placed 30 cm in front of it. Calculate the magnification of the image.
A. -0.5
B. -1
C. -1.5
D. -2
Question 13
A block of mass 5 kg is attached to a spring with a spring cons\tant of 100 N/m. If the block is displaced by 2 m from its equilibrium position, what is the potential energy stored in the spring?
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 14
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. 0.5 m/s^2
B. 1 m/s^2
C. 2 m/s^2
D. 4 m/s^2
Question 15
A 10 μF capacitor is connected in series with a 20 μF capacitor. Calculate the equivalent capaci\tance of the circuit.
A. 5 μF
B. 10 μF
C. 15 μF
D. 20 μF

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