POST UTME BELLS UNIVERSITY 2022 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A radioactive sample decays from 100 g to 50 g in 10 years. What is the half-life of the sample?
A. 5 years
B. 10 years
C. 20 years
D. 30 years
Question 2
A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.5 m from its equilibrium position and released from rest, what is the maximum speed of the particle?
A. 1 m/s
B. 2 m/s
C. 3 m/s
D. 4 m/s
Question 3
A sound wave has a frequency of 200 Hz and a wavelength of 1.5 m. What is its speed?
A. 300 m/s
B. 400 m/s
C. 500 m/s
D. 600 m/s
Question 4
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 5
A lens of focal length 0.2 m forms an image of an object at a dis\tance of 0.5 m. What is the magnification of the lens?
A. 0.4
B. 0.5
C. 0.6
D. 0.7
Question 6
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial volume is 2.5 L, what is the final volume?
A. 3.33 L
B. 4.17 L
C. 5.00 L
D. 6.25 L
Question 7
A 2 kg object is moving at 5 m/s. If a force of 10 N is applied to the object, what is its acceleration?
A. 0.5 m/s^2
B. 1.0 m/s^2
C. 2.0 m/s^2
D. 5.0 m/s^2
Question 8
A 5 kg block is moving at 10 m/s on a frictionless surface. If a force of 20 N is applied to the block, what is its acceleration?
A. 0.5 m/s^2
B. 1.0 m/s^2
C. 2.0 m/s^2
D. 5.0 m/s^2
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 force of 12 N, what is the magnitude of the force?
A. 8 N
B. 12 N
C. 16 N
D. 20 N
Question 10
A heat engine operates between the temperatures 300 K and 600 K. If the engine absorbs 1000 J of heat from the high-temperature reservoir, what is the efficiency of the engine?
A. 0.25
B. 0.33
C. 0.5
D. 0.67
Question 11
A capacitor consists of two parallel plates, each of area 0.01 m^2, separated by a dis\tance of 0.001 m. If the capaci\tance is 10 μF, what is the charge stored on the capacitor when a potential difference of 5 V is applied?
A. 0.05 C
B. 0.1 C
C. 0.15 C
D. 0.2 C
Question 12
A 10 μF capacitor is connected in series with a 20 Ω resistor and a 120 V power source. What is the current flowing through the circuit?
A. 0.5 A
B. 1 A
C. 2 A
D. 5 A
Question 13
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 100 V. What is the energy stored in the capacitor?
A. 0.5 J
B. 1 J
C. 5 J
D. 10 J
Question 14
A radioactive sample decays at a rate of 0.05% per hour. If the initial activity is 1000 Bq, what is the activity after 5 hours?
A. 900 Bq
B. 950 Bq
C. 1000 Bq
D. 1050 Bq
Question 15
A 100 W light bulb is connected to a 220 V power source. What is the current flowing through the bulb?
A. 0.45 A
B. 0.50 A
C. 0.55 A
D. 0.60 A

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