POST UTME REDEEMERS UNIVERSITY 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A radioactive sample of uranium-238 undergoes \alpha decay. If the initial mass of the sample is 200 g, what is the mass of the daughter nucleus after 10 half-lives?
A. 25 g
B. 50 g
C. 100 g
D. 200 g
Question 2
A magnetic field of 0.5 T is applied to a coil of wire with 100 turns and a resis\tance of 2 ohms. What is the induced emf in the coil?
A. 0.5 V
B. 1 V
C. 2 V
D. 5 V
Question 3
A 1000 W heater is connected to a 120 V AC voltage source. If the resis\tance of the heater is 10 Ω, what is the current drawn by the heater?
A. 10 A
B. 20 A
C. 30 A
D. 40 A
Question 4
A wave has a frequency of 20 Hz and a wavelength of 0.5 m. What is the speed of the wave?
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s
Question 5
A gas expands from an initial volume of 2 L to a final volume of 5 L at a cons\tant temperature of 300 K. If the initial pressure is 2 atm, what is the final pressure?
A. 1 atm
B. 1.5 atm
C. 2 atm
D. 3 atm
Question 6
A 100 W light bulb is connected to a 220 V power source. If the resis\tance of the bulb is 50 Ω, what is the current flowing through the bulb?
A. 0.5 A
B. 1 A
C. 2 A
D. 4 A
Question 7
A simple harmonic motion has a frequency of 2 Hz and an amplitude of 3 m. If the motion is at its maximum displacement, what is the acceleration of the object?
A. 6 m/s^2
B. 12 m/s^2
C. 18 m/s^2
D. 24 m/s^2
Question 8
A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. If a 120 V AC voltage source is connected across the circuit, what is the total resis\tance of the circuit?
A. 60 Ω
B. 70 Ω
C. 80 Ω
D. 90 Ω
Question 9
A 10 V AC source is connected in series with a 20 Ω resistor and a 50 μF capacitor. What is the impedance of the circuit?
A. 10 Ω
B. 20 Ω
C. 30 Ω
D. 40 Ω
Question 10
A gas at a pressure of 2 atm and a temperature of 300 K is allowed to expand to a volume of 5 m^3. What is the final pressure of the gas?
A. 0.4 atm
B. 0.8 atm
C. 1.2 atm
D. 1.6 atm
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. What is the magnitude of the centripetal acceleration?
A. 0.5 m/s^2
B. 1 m/s^2
C. 2 m/s^2
D. 4 m/s^2
Question 12
A uniform magnetic field of magnitude 2.0 T is directed along the z-axis. A current of 5.0 A flows in a circular loop of radius 0.20 m, placed in the x-y plane. What is the magnitude of the magnetic moment of the loop?
A. 0.10 A m^2
B. 0.20 A m^2
C. 0.50 A m^2
D. 1.00 A m^2
Question 13
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. If the circuit is closed, what is the current flowing through the 6 Ω resistor?
A. 0.5 A
B. 1 A
C. 1.5 A
D. 2 A
Question 14
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 15
A simple harmonic motion has an amplitude of 5 cm and a frequency of 2 Hz. What is the angular frequency of the motion?
A. 4\pi rad/s
B. 2\pi rad/s
C. \pi rad/s
D. 0.5\pi rad/s

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