POST UTME ACHIEVERS UNIVERSITY 2019 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° 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 2
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 3
A body of mass 5 kg is at rest on a frictionless surface. A force of 10 N is applied to the body for 2 seconds. What is the velocity of the body after the force is removed?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 4
A sound wave with a frequency of 200 Hz has a speed of 340 m/s. What is the wavelength of the sound wave?
A. 1.7 m
B. 1.7 cm
C. 1.7 km
D. 1.7 μm
Question 5
A heat engine operates between the temperatures 300 K and 600 K. What is the efficiency of the engine?
A. 20%
B. 30%
C. 40%
D. 50%
Question 6
A gas is enclosed in a container with a movable piston. The gas is heated, cau\sing its pressure to increase. Which of the following best describes the change in the gas's volume?
A. The volume of the gas decreases.
B. The volume of the gas increases.
C. The volume of the gas remains cons\tant.
D. The volume of the gas becomes negative.
Question 7
A ray of light 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 relationship between $\theta_i$ and $\theta_r$?
A. \frac{\sin\theta_i}{\sin\theta_r} = \mu
B. \frac{\sin\theta_r}{\sin\theta_i} = \mu
C. \frac{\cos\theta_i}{\cos\theta_r} = \mu
D. \frac{\cos\theta_r}{\cos\theta_i} = \mu
Question 8
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 angle between the velocity vector and the radius vector at the ins\tant when the particle is at the bottom of its path?
A. 30°
B. 45°
C. 60°
D. 90°
Question 9
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 10
A 3 kg object is moving in a circular path with a cons\tant speed of 6 m/s. If the radius of the path is 5 m, what is the magnitude of the centripetal force acting on the object?
A. 20 N
B. 30 N
C. 40 N
D. 50 N
Question 11
A simple harmonic motion has a period $T$ and an amplitude $A$. If the angular frequency is $\omega$, what is the relationship between $\omega$ and $T$?
A. \omega = \frac{2\pi}{T}
B. \omega = \frac{T}{2\pi}
C. \omega = \frac{A}{T}
D. \omega = \frac{T}{A}
Question 12
A block of mass 4 kg is attached to a horizontal spring with a spring cons\tant of 250 N/m. The block is displaced by 0.3 m from its equilibrium position and released from rest. What is the maximum speed of the block?
A. 3 m/s
B. 6 m/s
C. 9 m/s
D. 12 m/s
Question 13
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 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 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

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