POST UTME BELLS UNIVERSITY 2017 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A ray of light passes from air into a glass slab of re\fractive index 1.5. If the angle of incidence is 30°, calculate the angle of re\fraction.
A. 20°
B. 25°
C. 30°
D. 35°
Question 2
A 10 μF capacitor is connected in series with a 20 μF capacitor and a 30 μF capacitor. If a voltage of 12 V is applied across the circuit, what is the charge on the 20 μF capacitor?
A. 0.24 C
B. 0.3 C
C. 0.36 C
D. 0.4 C
Question 3
A particle of mass 2 kg is projected from the origin with an initial velocity of 20 m/s at an angle of 60° to the horizontal. If the acceleration due to gravity is 9.8 m/s², calculate the time taken for the particle to reach its maximum height.
A. 2.5 s
B. 3.0 s
C. 3.5 s
D. 4.0 s
Question 4
A sound wave with a frequency of 200 Hz and a speed of 343 m/s is traveling through a medium. Calculate the wavelength of the sound wave.
A. 1.7 m
B. 1.8 m
C. 1.9 m
D. 2 m
Question 5
A heat engine operates between 500 K and 300 K. Calculate the efficiency of the engine.
A. 0.25
B. 0.33
C. 0.40
D. 0.50
Question 6
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 7
A magnetic field of 0.5 T is applied to a coil of 50 turns and radius 0.1 m. If the current is increased from 2 A to 4 A, calculate the change in magnetic flux.
A. 0.25 Wb
B. 0.5 Wb
C. 0.75 Wb
D. 1.0 Wb
Question 8
A radioactive sample decays from 100 g to 50 g in 10 years. Calculate the half-life of the sample.
A. 5 years
B. 10 years
C. 15 years
D. 20 years
Question 9
A 10 μF capacitor is connected in series with a 20 Ω resistor and a 50 V battery. Calculate the time cons\tant of the circuit.
A. 0.1 s
B. 0.2 s
C. 0.5 s
D. 1 s
Question 10
A projectile is launched from the origin with an initial velocity $v_0$ at an angle $\theta$ above the horizontal. If air resis\tance is neglected, what is the time of flight of the projectile?
A. $\frac{2v_0\sin\theta}{g}$
B. $\frac{2v_0\cos\theta}{g}$
C. $\frac{v_0\sin\theta}{g}$
D. $\frac{v_0\cos\theta}{g}$
Question 11
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. The capacitor is connected to a 12 V battery. Calculate the capaci\tance and the charge stored on the plates.
A. 1.77 \u00B5F
B. 2.22 \u00B5F
C. 3.33 \u00B5F
D. 4.44 \u00B5F
Question 12
A thermodynamic system is in equilibrium with its surroundings. The temperature of the system is 300 K. What is the entropy change of the system?
A. 0 J/K
B. 10 J/K
C. 20 J/K
D. 30 J/K
Question 13
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 angular velocity of the particle?
A. 2 rad/s
B. 4 rad/s
C. 6 rad/s
D. 8 rad/s
Question 14
A ray of light passes through a convex lens of focal length 0.2 m. If the object dis\tance is 0.3 m, calculate the image dis\tance.
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 15
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in parallel. If the current through the 4 Ω resistor is 2 A, calculate the current through the 6 Ω resistor.
A. 1.5 A
B. 2.0 A
C. 2.5 A
D. 3.0 A

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