POST UTME BELLS UNIVERSITY 2017 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
A projectile is launched at an angle of 30° to the horizontal with an initial velocity of 20 m/s. If the acceleration due to gravity is 9.8 m/s², what is the time of flight of the projectile?
A. 2 s
B. 4 s
C. 6 s
D. 8 s
Question 3
A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 50 Ω resistor connected in parallel. If a 50 V battery is connected across the circuit, calculate the current through the 10 Ω resistor.
A. 0.5 A
B. 1 A
C. 2 A
D. 5 A
Question 4
A 100 W light bulb is connected to a 220 V power source. If the resis\tance of the light bulb is 20 Ω, calculate the current flowing through the light bulb.
A. 0.5 A
B. 1.0 A
C. 1.5 A
D. 2.0 A
Question 5
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 6
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 7
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. 30°
C. 40°
D. 50°
Question 8
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 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 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 10
A particle of mass $m$ is moving in a circular path of radius $r$ with a cons\tant speed $v$. If the particle is subjected to a centripetal force $F_c = \frac{mv^2}{r}$, what is the work done by this force in moving the particle through an angle $\theta$?
A. $\frac{1}{2}mv^2\left\( 1-\cos\theta\right \)$
B. $\frac{1}{2}mv^2\left\( 1+\cos\theta\right \)$
C. $mv^2\left\( 1-\cos\theta\right \)$
D. $mv^2\left\( 1+\cos\theta\right \)$
Question 11
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 12
A light ray passes through a prism of angle 30° and is re\fracted at an angle of 20°. What is the angle of deviation of the light ray?
A. 10°
B. 20°
C. 30°
D. 40°
Question 13
A magnetic field of 0.5 T is applied to a coil of 100 turns and a resis\tance of 10 Ω. If the current in the coil is 2 A, what is the induced emf in the coil?
A. 0.1 V
B. 0.2 V
C. 0.5 V
D. 1 V
Question 14
A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 20 V is applied across the plates, calculate the charge stored on each plate.
A. 200 μC
B. 400 μC
C. 600 μC
D. 800 μC
Question 15
A current of 2 A flows through a resistor of 4 Ω. Calculate the power dissipated in the resistor.
A. 4 W
B. 8 W
C. 12 W
D. 16 W

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