POST UTME RSU 2019 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A magnetic field is produced by a current-carrying wire. If the current is 2 A and the length of the wire is 1 m, find the magnetic field strength at a dis\tance of 0.5 m from the wire.
A. 0.1 T
B. 0.2 T
C. 0.3 T
D. 0.4 T
Question 2
A light ray passes from air into a glass slab of thickness 5 cm and 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 3
A sound wave has a frequency of 200 Hz and a wavelength of 0.5 m. Find the speed of the sound wave.
A. 100 m/s
B. 200 m/s
C. 300 m/s
D. 400 m/s
Question 4
A light source is placed 2 m away from a convex lens of focal length 0.5 m. If the light source is moved 0.5 m closer to the lens, calculate the new image dis\tance.
A. 1.5 m
B. 2 m
C. 2.5 m
D. 3 m
Question 5
A particle of mass m is attached to a spring with spring cons\tant k. The particle is displaced from its equilibrium position by a dis\tance x and released from rest. Assuming the motion is simple harmonic, find the angular frequency ω.
A. \sqrt{\frac{k}{m}}
B. \frac{1}{\sqrt{km}}
C. \frac{1}{\sqrt{mk}}
D. \sqrt{\frac{m}{k}}
Question 6
A 10 kg block is attached to a horizontal, massless spring with a force 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. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 7
A 5 kg block is attached to a horizontal spring with a force cons\tant of 100 N/m. If the block is displaced by 2 m from its equilibrium position and released, 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 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 acceleration of the particle?
A. 8 m/s^2
B. 10 m/s^2
C. 12 m/s^2
D. 16 m/s^2
Question 9
A wave has a frequency of 50 Hz and a wavelength of 0.1 m. What is the speed of the wave?
A. 5 m/s
B. 10 m/s
C. 20 m/s
D. 50 m/s
Question 10
A 100 V AC supply is connected to a 50 Ω resistor. If the current is 2 A, what is the power consumed by the resistor?
A. 200 W
B. 250 W
C. 300 W
D. 400 W
Question 11
A 240 V AC supply is connected in parallel with a 100 Ω resistor. What is the current flowing through the resistor?
A. 2.4 A
B. 4 A
C. 6 A
D. 8 A
Question 12
A radioactive sample emits \alpha particles with a half-life of 5 minutes. If the initial activity is 100 Bq, what is the activity after 10 minutes?
A. 50 Bq
B. 25 Bq
C. 12.5 Bq
D. 6.25 Bq
Question 13
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 work done by the force in 5 seconds?
A. 60 J
B. 80 J
C. 100 J
D. 120 J
Question 14
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. What is the magnitude of the centripetal acceleration?
A. 0.5 m/s²
B. 1 m/s²
C. 2 m/s²
D. 4 m/s²
Question 15
A magnetic field of 0.5 T is applied to a coil of 100 turns and a radius of 0.2 m. If the current flowing through the coil is 2 A, what is the magnitude of the torque experienced by the coil?
A. 0.1 Nm
B. 0.2 Nm
C. 0.3 Nm
D. 0.4 Nm

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