POST UTME RHEMA UNIVERSITY 2023 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A circuit consists of a 12 Ω resistor and a 20 Ω resistor connected in series. If a 6 V battery is connected across the circuit, what is the current flowing through the 12 Ω resistor?
A. 0.25 A
B. 0.5 A
C. 0.75 A
D. 1 A
Question 2
A gas occupies a volume of 2.5 L at a pressure of 1.5 atm. If the pressure is increased to 3.0 atm, what is the new volume of the gas?
A. 1.5 L
B. 2.0 L
C. 2.5 L
D. 3.0 L
Question 3
A 2 m long wire is carrying a current of 5 A. If the magnetic field at a dis\tance of 1 m from the wire is 0.1 T, what is the current in a nearby wire that is 1.5 m long and has a magnetic field of 0.2 T at a dis\tance of 0.5 m?
A. 10 A
B. 15 A
C. 20 A
D. 25 A
Question 4
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. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 5
A radioactive sample has a half-life of 5 years. If the initial activity is 100 Bq, what is the activity after 10 years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 6
A 2 A current flows through a 10 Ω resistor. What is the power dissipated?
A. 20 W
B. 40 W
C. 60 W
D. 80 W
Question 7
A radioactive sample decays with a half-life of 10 years. If the initial activity is 100 Bq, what is the activity after 20 years?
A. 25 Bq
B. 50 Bq
C. 75 Bq
D. 100 Bq
Question 8
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle's velocity is 4 m/s, what is its angular velocity?
A. 10 rad/s
B. 20 rad/s
C. 30 rad/s
D. 40 rad/s
Question 9
A magnetic field of 0.5 T is applied to a current-carrying wire of length 1 m. If the current is 2 A, what is the force on the wire?
A. 1 N
B. 2 N
C. 3 N
D. 4 N
Question 10
A radioactive sample has a half-life of 5 years. If the initial activity of the sample is 1000 Bq, what is the activity of the sample after 10 years?
A. 250 Bq
B. 500 Bq
C. 750 Bq
D. 1000 Bq
Question 11
A particle of mass m is confined to a one-dimensional box of length L. If the particle is in the ground state, what is the expectation value of its position?
A. L/2
B. L/\sqrt{2}
C. L/\pi
D. L/\sqrt{\pi}
Question 12
A particle of mass 1 kg is moving in a circular path of radius 2 m with a cons\tant speed of 3 m/s. If the particle is subjected to a centripetal force of 9 N, what is the magnitude of the acceleration of the particle?
A. 4 m/s^2
B. 6 m/s^2
C. 8 m/s^2
D. 10 m/s^2
Question 13
A particle of mass 1 kg is moving in a straight line with a velocity of 5 m/s. If the particle experiences a force of 10 N, calculate the acceleration of the particle.
A. 1 m/s^2
B. 2 m/s^2
C. 3 m/s^2
D. 4 m/s^2
Question 14
A particle of mass 0.1 kg is moving in a circular path of radius 0.5 m with a speed of 2 m/s. What is the centripetal force acting on the particle?
A. 0.1 N
B. 0.2 N
C. 0.3 N
D. 0.4 N
Question 15
A 1000 Hz AC voltage source is connected in series with a 50 Ω resistor and a 200 μF capacitor. If the initial phase angle between the voltage and current is 30°, what is the impedance of the circuit?
A. 60 Ω
B. 70 Ω
C. 80 Ω
D. 90 Ω

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