POST UTME UNIPORT 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 10 µF current is flowing in a circuit with a resis\tance of 20 Ω. What is the power dissipated in the circuit?
A. 0.2 W
B. 0.4 W
C. 0.6 W
D. 0.8 W
Question 2
A spring with spring cons\tant $k$ is stretched by a dis\tance $x$. What is the magnitude of the force exerted on the spring?
A. kx
B. \frac{k}{x}
C. \frac{x}{k}
D. k - x
Question 3
A gas is enclosed in a container at a temperature of 300 K. If the volume of the container is doubled, what is the new pressure of the gas, assuming the gas behaves like an ideal gas?
A. 600 Pa
B. 1200 Pa
C. 300 Pa
D. 1500 Pa
Question 4
A light ray passes from air into a glass 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 particle of mass $m$ is moving in a circular path of radius $R$ with a cons\tant speed $v$. What is the magnitude of the centripetal force acting on it?
A. \frac{mv^2}{R}
B. \frac{m}{v^2}
C. \frac{R}{mv^2}
D. \frac{v^2}{mR}
Question 6
A particle of mass $m$ is moving in a circular path of radius $R$ with a cons\tant speed $v$. What is the magnitude of the centripetal force acting on it?
A. \frac{mv^2}{R}
B. \frac{m}{v^2}
C. \frac{R}{mv^2}
D. \frac{v^2}{mR}
Question 7
A particle of mass 1.0 kg is moving in a circular path with a radius of 2.0 m. If the particle has a speed of 4.0 m/s, what is the magnitude of the centripetal acceleration?
A. 0.5 m/s²
B. 1.0 m/s²
C. 1.5 m/s²
D. 2.0 m/s²
Question 8
A 100 W light bulb is connected to a 220 V power source. If the bulb is used for 5 hours a day, how much electricity will it consume in a month?
A. 120 kWh
B. 150 kWh
C. 180 kWh
D. 200 kWh
Question 9
A spring with spring cons\tant $k$ is stretched by a dis\tance $x$. What is the magnitude of the force exerted on the spring?
A. kx
B. \frac{k}{x}
C. \frac{x}{k}
D. k - x
Question 10
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 11
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. If the current in the circuit is 2 A, what is the voltage drop across the 6 Ω resistor?
A. 6 V
B. 8 V
C. 10 V
D. 12 V
Question 12
A wave of wavelength $\lambda$ and frequency $f$ is traveling through a medium with speed $v$. What is the magnitude of the wave's momentum?
A. \frac{hv}{c}
B. \frac{h}{\lambda}
C. \frac{f}{v}
D. \frac{v}{f}
Question 13
A block of mass 2.0 kg is susp\ended from a spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released from rest, what is the maximum speed of the block?
A. 0.2 m/s
B. 0.4 m/s
C. 0.6 m/s
D. 0.8 m/s
Question 14
A container of volume $V$ is filled with an ideal gas at temperature $T$. If the gas is heated by $\Delta T$, what is the change in its internal energy?
A. nC_v\Delta T
B. nC_p\Delta T
C. nR\Delta T
D. nC_v\\Delta T + nC_p\\Delta T
Question 15
A container of volume $V$ is filled with an ideal gas at temperature $T$. If the gas is compressed by a factor of $\alpha$, what is the change in its internal energy?
A. nC_v\Delta T
B. nC_p\Delta T
C. nR\Delta T
D. nC_v\\Delta T + nC_p\\Delta T

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