POST UTME BELLS UNIVERSITY 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A particle of mass 0.5 kg is attached to a spring with a spring cons\tant of 100 N/m. The particle is displaced from its equilibrium position by 0.2 m and then released from rest. Assuming the motion is simple harmonic, calculate the time taken for the particle to reach its maximum speed.
A. 0.1 s
B. 0.2 s
C. 0.5 s
D. 1.0 s
Question 2
A particle moves 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 magnitude of the centripetal acceleration?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
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 experiences a centripetal acceleration of 2 m/s^2, what is the magnitude of the force acting on the particle?
A. 6 N
B. 8 N
C. 10 N
D. 12 N
Question 4
A capacitor of capaci\tance 10 μF is connected across a 5 V battery. Calculate the charge stored on the capacitor.
A. 50 μC
B. 100 μC
C. 200 μC
D. 500 μC
Question 5
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 20 V. If the dis\tance between the plates is doubled, what is the new capaci\tance?
A. 5 μF
B. 10 μF
C. 20 μF
D. 40 μF
Question 6
A gas at 300 K expands from 1 L to 2 L against a cons\tant external pressure of 1 atm. What is the work done by the gas?
A. -1.0 J
B. -0.5 J
C. 0.0 J
D. 1.0 J
Question 7
A block of mass 5 kg is attached to a horizontal, massless spring with a force cons\tant of 200 N/m. If the block is displaced by 0.1 m from its equilibrium position and released from rest, what is the maximum speed of the block?
A. 0.5 m/s
B. 1.0 m/s
C. 1.5 m/s
D. 2.0 m/s
Question 8
A 5.0 Ω resistor is connected in series with a 10.0 Ω resistor and a 12.0 V battery. If the initial current is 0 A, what is the current after 0.5 s?
A. 0.5 A
B. 1.0 A
C. 1.5 A
D. 2.0 A
Question 9
A radioactive sample has a half-life of 10 years. If the initial activity of the sample is 1000 Bq, what is the activity of the sample after 20 years?
A. 250 Bq
B. 500 Bq
C. 750 Bq
D. 1000 Bq
Question 10
A light ray 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. 20°
B. 25°
C. 30°
D. 35°
Question 11
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. 10 m/s^2
B. 12 m/s^2
C. 15 m/s^2
D. 20 m/s^2
Question 12
A magnetic field of 0.5 T is applied to a coil of 100 turns. If the area of the coil is 0.01 m², what is the magnetic flux?
A. 0.005 Wb
B. 0.01 Wb
C. 0.015 Wb
D. 0.02 Wb
Question 13
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial pressure is 1.2 atm, what is the final pressure?
A. 1.5 atm
B. 1.8 atm
C. 2.0 atm
D. 2.2 atm
Question 14
A radioactive sample decays at a rate of 10% per hour. If the initial activity is 100 Bq, calculate the activity after 2 hours.
A. 20 Bq
B. 40 Bq
C. 60 Bq
D. 80 Bq
Question 15
A particle of mass 1 kg is confined to a one-dimensional box of length 1 m. If the particle is in the ground state, what is the energy of the particle?
A. 0.1 J
B. 0.2 J
C. 0.3 J
D. 0.4 J

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: