POST UTME AAUA 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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. Calculate the magnitude of the force acting on the particle.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 2
A particle of mass 3 kg is moving in a circular path of radius 2 m with a cons\tant speed of 5 m/s. If the particle is subjected to a centripetal force of 15 N, what is the magnitude of the acceleration of the particle?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 3
A beam of light passes through a convex lens of focal length 20 cm. If the object dis\tance is 30 cm, calculate the image dis\tance.
A. 10 cm
B. 20 cm
C. 30 cm
D. 40 cm
Question 4
A 100 W bulb is connected to a 220 V mains supply. If the bulb is switched on for 5 hours, how much energy is consumed?
A. 1000 J
B. 2000 J
C. 3000 J
D. 4000 J
Question 5
A particle of mass $m$ is moving in a circular orbit of radius $r$ with a speed $v$. If the particle is subjected to a uniform magnetic field of strength $B$, what is the radius of the new orbit when the particle's speed is doubled?
A. \frac{mv}{2qB}
B. \frac{2mv}{qB}
C. \frac{mv}{qB}
D. \frac{4mv}{qB}
Question 6
A 10 μF capacitor is connected in series with a 20 Ω resistor and a 5 V battery. If the switch is closed at t = 0, what is the charge on the capacitor after 5 s?
A. 0.25 C
B. 0.5 C
C. 0.75 C
D. 1 C
Question 7
A particle of mass 0.5 kg is moving in a circular path of radius 2 m with a cons\tant speed of 4 m/s. What is the magnitude of the force acting on the particle?
A. 10 N
B. 12 N
C. 15 N
D. 20 N
Question 8
A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -15 cm. What is the focal length of the combination?
A. 10 cm
B. 15 cm
C. 20 cm
D. 25 cm
Question 9
A particle of mass 0.5 kg is moving in a circular path of radius 2 m with a speed of 4 m/s. Calculate the centripetal force acting on the particle.
A. 4 N
B. 8 N
C. 16 N
D. 32 N
Question 10
A 2.5 m long wire of resis\tance 5 Ω is connected in series with a 10 V battery. If the wire is bent into a square loop, what is the total resis\tance of the loop?
A. 6 Ω
B. 7.5 Ω
C. 10 Ω
D. 12.5 Ω
Question 11
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 required to stop the particle in 2 s?
A. 24 N
B. 36 N
C. 48 N
D. 60 N
Question 12
A beam of light passes from air into a glass slab of re\fractive index 1.5. If the angle of incidence is 30°, calculate the angle of re\fraction.
A. 20°
B. 25°
C. 30°
D. 35°
Question 13
A block of mass 4 kg is attached to a horizontal, massless spring with a force cons\tant of 300 N/m. The block is displaced by 3 m from its equilibrium position and released from rest. What is the maximum speed of the block?
A. 3 m/s
B. 5 m/s
C. 7 m/s
D. 9 m/s
Question 14
A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.2 m from its equilibrium position and released from rest, what is the maximum velocity of the particle?
A. 0.2 m/s
B. 0.4 m/s
C. 0.6 m/s
D. 0.8 m/s
Question 15
A wave of wavelength 4 m and frequency 3 Hz is traveling through a medium. If the wave has a speed of 12 m/s, what is the amplitude of the wave?
A. 0.5 m
B. 1 m
C. 2 m
D. 4 m

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