POST UTME CALEB UNIVERSITY 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A uniform magnetic field of magnitude 2.5 T is directed along the z-axis. A current of 5 A flows in a circular loop of radius 0.1 m, placed in the x-y plane. What is the magnitude of the magnetic moment of the loop?
A. 0.05 A m^2
B. 0.1 A m^2
C. 0.15 A m^2
D. 0.2 A m^2
Question 2
A 100 W light bulb is connected to a 220 V AC voltage source. Find the current drawn by the bulb.
A. 0.5 A
B. 1.0 A
C. 1.5 A
D. 2.0 A
Question 3
A 10 kg block is moving on a rough horizontal surface with a speed of 2 m/s. The coefficient of kinetic friction between the block and the surface is 0.2. Determine the force of friction acting on the block.
A. 2 N
B. 4 N
C. 6 N
D. 8 N
Question 4
A 50 Hz AC voltage source is connected in series with a 20 Ω resistor and a 10 μF capacitor. If the switch is closed at t = 0, what is the current in the circuit at t = 10 ms?
A. 0.5 A
B. 1 A
C. 2 A
D. 4 A
Question 5
A particle of mass 2 kg is attached to a spring with spring cons\tant 100 N/m. It is displaced by 0.5 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the maximum speed of the particle.
A. 1 m/s
B. 2 m/s
C. 3 m/s
D. 4 m/s
Question 6
A wave of wavelength $\lambda$ and frequency $f$ is traveling through a medium with speed $v$. If the wave's amplitude is $A$, what is the intensity of the wave?
A. \frac{1}{2} \rho \omega^2 A^2 v
B. \frac{1}{2} \rho \omega^2 A^2 v^2
C. \frac{1}{2} \rho \omega^2 A^2 v
D. \frac{1}{2} \rho \omega^2 A^2 v^2
Question 7
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 100 V. If a dielectric slab of thickness 0.5 mm and dielectric cons\tant 5 is inserted between the plates, calculate the new capaci\tance.
A. 50 μF
B. 100 μF
C. 150 μF
D. 200 μF
Question 8
A beam of light passes from air into a glass 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 9
A 5 kg block is attached to a horizontal, massless spring with a force cons\tant of 50 N/m. The block is displaced by 0.1 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, determine the maximum kinetic energy of the block as it passes through the equilibrium position.
A. 0.25 J
B. 0.5 J
C. 0.75 J
D. 1.0 J
Question 10
A body is at rest on a horizontal, frictionless surface. A horizontal force of 10 N is applied to the body, cau\sing it to move with a cons\tant acceleration of 2 m/s^2. What is the mass of the body?
A. 5 kg
B. 10 kg
C. 15 kg
D. 20 kg
Question 11
A block of mass 5 kg is placed on a frictionless surface and a horizontal force of 20 N is applied to it. If the block starts from rest, calculate its velocity after 2 s.
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s
Question 12
A ray of light passes from air into a glass 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 projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If the air resis\tance is negligible, what is the maximum height reached by the projectile?
A. 10 m
B. 20 m
C. 30 m
D. 40 m
Question 14
A particle of mass 2 kg is moving in a circular path of radius 5 m with a cons\tant speed of 10 m/s. Find the magnitude of the force acting on the particle.
A. 20 N
B. 30 N
C. 40 N
D. 50 N
Question 15
A light ray 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. 30°
C. 40°
D. 50°

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