POST UTME UNIPORT 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A capacitor has a capaci\tance of 10 μF and is connected to a 12 V battery. What is the charge stored on the capacitor?
A. 0.12 C
B. 0.24 C
C. 0.36 C
D. 0.48 C
Question 2
A wave of frequency $f$ and wavelength $\lambda$ is traveling through a medium with speed $v$. If the wave is reflected off a surface, what is the wavelength of the reflected wave?
A. \lambda
B. 2\lambda
C. \frac{v}{f}
D. \frac{f}{v}
Question 3
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. What is the maximum height reached by the projectile?
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Question 4
A vector A has a magnitude of 5 units and makes an angle of 30° with the x-axis. What is its x-component?
A. 4 units
B. 5 units
C. 6 units
D. 7 units
Question 5
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. 18°
B. 20°
C. 22°
D. 24°
Question 6
A capacitor consists of two parallel plates, each of area 0.04 m^2, separated by a dis\tance of 0.002 m. If the capaci\tance is 8 x 10^-6 F, what is the charge stored on the capacitor when a potential difference of 12 V is applied?
A. 96 μC
B. 192 μC
C. 288 μC
D. 384 μC
Question 7
A capacitor consists of two parallel plates, each of area 0.1 m^2, separated by a dis\tance of 0.01 m. The plates are charged to a potential difference of 10 V. What is the capaci\tance of the capacitor?
A. 0.1 F
B. 0.5 F
C. 1 F
D. 5 F
Question 8
A wave of frequency $f$ and wavelength $\lambda$ is traveling through a medium with speed $v$. If the wave is reflected off a surface, what is the frequency of the reflected wave?
A. f
B. 2f
C. \frac{v}{\lambda}
D. \frac{\lambda}{v}
Question 9
A magnetic field is produced by a current-carrying wire. If the current is $I$ and the length of the wire is $L$, what is the value of the magnetic field at a dis\tance $r$ from the wire?
A. \frac{\mu_0 I}{2\pi r}
B. \frac{2\pi r \mu_0 I}{L}
C. \frac{L \mu_0 I}{2\pi r}
D. \frac{2\pi r}{L \mu_0 I}
Question 10
A particle of mass $m$ is moving in a circular orbit of radius $r$ in a uniform magnetic field of strength $B$. If the particle's speed is $v$, what is the magnitude of the magnetic field?
A. \frac{mv}{qr}
B. \frac{mv^2}{qr}
C. \frac{m^2v}{qr}
D. \frac{mv^2}{r^2}
Question 11
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If the projectile lands 10 m away from the point of launch, what is the time of flight of the projectile?
A. 1 s
B. 2 s
C. 3 s
D. 4 s
Question 12
A wave has a frequency of 50 Hz and a wavelength of 0.2 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 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 magnitude of the acceleration of the particle?
A. 6 m/s^2
B. 12 m/s^2
C. 18 m/s^2
D. 24 m/s^2
Question 14
A light ray passes from air into a glass slab of re\fractive index $\mu$. If the angle of incidence is $\theta_i$ and the angle of re\fraction is $\theta_r$, what is the value of $\mu$?
A. \frac{\sin \theta_i}{\sin \theta_r}
B. \frac{\sin \theta_r}{\sin \theta_i}
C. \frac{\cos \theta_i}{\cos \theta_r}
D. \frac{\cos \theta_r}{\cos \theta_i}
Question 15
A gas is heated from $T_1$ to $T_2$. If the initial volume is $V_1$ and the final volume is $V_2$, what is the value of the ratio $\frac{V_2}{V_1}$?
A. \frac{T_2}{T_1}
B. \frac{T_1}{T_2}
C. \frac{V_2}{V_1}
D. \frac{V_1}{V_2}

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