POST UTME ACHIEVERS UNIVERSITY 2019 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A body of mass 3 kg is moving in a straight line with a velocity of 5 m/s. If the body is subjected to a force of 10 N, what is its acceleration?
A. 1.67 m/s^2
B. 2.0 m/s^2
C. 2.5 m/s^2
D. 3.0 m/s^2
Question 2
A 10 μF capacitor is charged to a potential difference of 20 V. If it is connected in series with a 20 Ω resistor, calculate the time cons\tant.
A. 0.4 s
B. 0.8 s
C. 1.2 s
D. 1.6 s
Question 3
A particle is moving in a circular path with a radius of 3 m. The particle completes one revolution in 6 s. What is the angular velocity of the particle?
A. 0.5 rad/s
B. 1 rad/s
C. 2 rad/s
D. 3 rad/s
Question 4
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 5
A particle of mass $m$ is moving in a circular path of radius $r$ with a cons\tant speed $v$. If the particle is subject to a centripetal force $F_c$, what is the relationship between $F_c$ and $v$?
A. F_c = \frac{mv^2}{r}
B. F_c = \frac{mr^2}{v}
C. F_c = \frac{v^2}{r}
D. F_c = \frac{r^2}{v}
Question 6
A light ray passes from air into a glass block with a re\fractive index of 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 7
A block of mass 3 kg is attached to a horizontal spring with a spring cons\tant of 200 N/m. 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. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 8
A 10 μF capacitor is connected in series with a 5 kΩ resistor. If a voltage of 12 V is applied across the circuit, what is the current flowing through the resistor?
A. 0.2 mA
B. 0.4 mA
C. 0.6 mA
D. 0.8 mA
Question 9
A sound wave with a frequency of 200 Hz and a wavelength of 0.5 m is traveling through a medium. If the speed of the wave is 340 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 10
A 5 Ω resistor is connected in parallel with a 10 Ω resistor. If a current of 2 A flows through the circuit, calculate the equivalent resis\tance.
A. 2.5 Ω
B. 3.5 Ω
C. 4.5 Ω
D. 5.5 Ω
Question 11
A 5 Ω resistor is connected in series with a 10 Ω resistor. If a current of 2 A flows through the circuit, calculate the voltage across the 5 Ω resistor.
A. 10 V
B. 20 V
C. 30 V
D. 40 V
Question 12
A magnetic field of strength 0.5 T is directed along the positive z-axis. A current of 2 A flows in a wire loop of radius 0.2 m. What is the magnitude of the magnetic moment of the loop?
A. 0.1 A m^2
B. 0.2 A m^2
C. 0.3 A m^2
D. 0.4 A m^2
Question 13
A particle of mass 0.2 kg is moving in a circular path of radius 0.5 m with a cons\tant speed of 2 m/s. If the particle experiences a centripetal acceleration of 4 m/s^2, what is the magnitude of the net force acting on the particle?
A. 0.8 N
B. 1.6 N
C. 2.4 N
D. 3.2 N
Question 14
A parallel plate capacitor has a capaci\tance of $C$ and is connected to a battery of emf $\epsilon$. If the dis\tance between the plates is increased by a factor of $n$, what is the new capaci\tance?
A. \frac{C}{n}
B. nC
C. \frac{nC}{\epsilon}
D. C + \frac{C}{n}
Question 15
A 2 kg object is moving in a circular path with a cons\tant speed of 5 m/s. If the radius of the path is 4 m, what is the magnitude of the centripetal force acting on the object?
A. 10 N
B. 20 N
C. 30 N
D. 40 N

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