POST UTME CALEB UNIVERSITY 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A particle of mass 1 kg is moving in a circular path with a radius of 0.5 m. If the particle is moving at a speed of 2 m/s, calculate the centripetal force acting on the particle.
A. 2 N
B. 4 N
C. 6 N
D. 8 N
Question 2
A concave lens of focal length 20 cm is used to form an image of an object placed 30 cm away. Calculate the magnification of the lens.
A. 0.5
B. 1
C. 2
D. 3
Question 3
A particle of mass $m$ is moving in a straight line with velocity $v$. If the particle's kinetic energy is $K$, what is the force exerted on the particle by a stationary object?
A. \frac{K}{v}
B. \frac{K}{v^2}
C. \frac{K}{v}
D. \frac{K}{v^2}
Question 4
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 5
A particle of mass 0.5 kg is moving in a circular path of radius 0.2 m with a speed of 4 m/s. Determine the centripetal acceleration of the particle.
A. 0.5 m/s^2
B. 1.0 m/s^2
C. 1.5 m/s^2
D. 2.0 m/s^2
Question 6
A radioactive sample decays with a half-life of 10 years. If the initial activity is 100 Bq, calculate the activity after 20 years.
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 7
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 8
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 9
A particle of mass $m$ is moving in a circular orbit of radius $R$ around a fixed point $O$. The particle's velocity is $v$ and its angular momentum is $L$. If the particle's kinetic energy is doubled, what is the new angular momentum $L'$?
A. \frac{L}{\sqrt{2}}
B. \frac{L}{2}
C. \frac{L}{\sqrt{2}}
D. \frac{L}{2}
Question 10
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 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?
A. 8 N
B. 12 N
C. 16 N
D. 24 N
Question 12
A 100 Hz AC voltage source is connected in series with a 10 mH inductor and a 20 Ω resistor. The initial current is 0 A. Find the current at t = 0.1 s.
A. 0.5 A
B. 1.0 A
C. 1.5 A
D. 2.0 A
Question 13
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°
Question 14
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 15
A parallel plate capacitor consists of two plates, each of area 0.05 m^2, separated by a dis\tance of 0.005 m. The space between the plates is filled with a dielectric material of dielectric cons\tant 3. The capacitor is connected to a battery of emf 12 V. Determine the capaci\tance of the capacitor.
A. 0.01 F
B. 0.02 F
C. 0.03 F
D. 0.04 F

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