POST UTME BELLS UNIVERSITY 2019 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the total resis\tance of the circuit?
A. 10 Ω
B. 12 Ω
C. 16 Ω
D. 20 Ω
Question 2
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle has a speed of 4 m/s, what is the centripetal force acting on the particle?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 3
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the current flowing through the circuit?
A. 1 A
B. 2 A
C. 3 A
D. 4 A
Question 4
A beam of light passes from air into a glass 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 5
A gas is enclosed in a container at a temperature of 300 K. If the temperature is increased to 400 K, what is the ratio of the final volume to the initial volume?
A. 1.33
B. 2.00
C. 3.00
D. 4.00
Question 6
A 100 W light bulb is connected to a 120 V AC source. What is the impedance of the bulb?
A. 50 Ω
B. 100 Ω
C. 150 Ω
D. 200 Ω
Question 7
A radioactive sample decays at a rate of 0.5% per hour. If the initial mass of the sample is 100 g, what is the mass of the sample after 3 hours?
A. 90 g
B. 80 g
C. 70 g
D. 60 g
Question 8
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 force acting on the particle?
A. 8 N
B. 10 N
C. 12 N
D. 16 N
Question 9
A 2 kg object is attached to a spring with a spring cons\tant of 100 N/m. What is the frequency of oscillation?
A. 0.5 Hz
B. 1 Hz
C. 2 Hz
D. 5 Hz
Question 10
A radioactive sample decays from 100 g to 50 g in 10 minutes. What is the half-life of the sample?
A. 5 minutes
B. 10 minutes
C. 15 minutes
D. 20 minutes
Question 11
A light wave with a wavelength of 600 nm is incident on a double-slit apparatus. If the dis\tance between the slits is 0.5 mm, what is the angle of the first minimum?
A. 10°
B. 20°
C. 30°
D. 40°
Question 12
A gas at 300 K has a volume of 2.5 L. If the temperature is increased to 400 K, what is the new volume of the gas?
A. 3.2 L
B. 3.5 L
C. 4.0 L
D. 4.5 L
Question 13
A 10 μCi source of 226 Ra decays by \alpha emission. What is the activity of the source after 2 half-lives?
A. 5 μCi
B. 2.5 μCi
C. 1.25 μCi
D. 0.625 μCi
Question 14
A vector has a magnitude of 5 units and an angle of 30° with the positive x-axis. What is the x-component of the vector?
A. 4 units
B. 5 units
C. 6 units
D. 7 units
Question 15
A sound wave with a frequency of 200 Hz is emitted from a source moving towards a stationary observer. If the speed of sound in air is 343 m/s, what is the apparent frequency heard by the observer?
A. 220 Hz
B. 200 Hz
C. 180 Hz
D. 160 Hz

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