POST UTME UNIPORT 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A simple harmonic motion has a frequency of 2 Hz and an amplitude of 3 units. What is the angular frequency?
A. 4 rad/s
B. 6 rad/s
C. 8 rad/s
D. 10 rad/s
Question 2
A gas is contained in a cylinder of volume $V$ and is heated from temperature $T_1$ to $T_2$. If the gas is ideal and the process is adiabatic, what is the final pressure of the gas?
A. P_2 = P_1 \left\( \frac{T_2}{T_1}\right \)^{\gamma}
B. P_2 = P_1 \left\( \frac{T_2}{T_1}\right \)^{\frac{1}{\gamma}}
C. P_2 = P_1 \left\( \frac{T_2}{T_1}\right \)^{\frac{\gamma}{\gamma-1}}
D. P_2 = P_1 \left\( \frac{T_2}{T_1}\right \)^{\frac{1}{\gamma-1}}
Question 3
A resistor of 10 Ω is connected in series with a capacitor of 10^-6 F and an inductor of 10^-2 H. If an alternating current of frequency 50 Hz is applied across the circuit, what is the impedance of the circuit?
A. 10 Ω
B. 20 Ω
C. 30 Ω
D. 40 Ω
Question 4
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 5
A capacitor is connected to a power source and a resistor in series. If the capaci\tance is doubled, what happens to the time cons\tant?
A. Increases by a factor of 2
B. Increases by a factor of 4
C. Remains the same
D. Decreases by a factor of 2
Question 6
A magnetic field has a strength of 0.5 T and is directed along the x-axis. What is the magnetic flux through a loop of area 0.2 m^2?
A. 0.1 Wb
B. 0.2 Wb
C. 0.3 Wb
D. 0.4 Wb
Question 7
A wave of frequency 50 Hz and wavelength 10 m is traveling through a medium. If the wave has a speed of 300 m/s, what is the amplitude of the wave?
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 8
A sound wave has a frequency of 200 Hz and a wavelength of 0.5 m. What is the speed of the sound wave?
A. 100 m/s
B. 200 m/s
C. 400 m/s
D. 800 m/s
Question 9
A magnetic field is produced by a current-carrying wire. If the current is doubled, what happens to the magnetic field strength?
A. Increases by a factor of 2
B. Increases by a factor of 4
C. Remains the same
D. Decreases by a factor of 2
Question 10
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 11
A radioactive sample has a half-life of 5 years. If the initial activity is 100 Bq, what is the activity after 10 years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 12
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 13
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 14
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 15
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°

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