POST UTME COVENANT UNIVERSITY 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A capacitor consists of two parallel plates, each of area 0.1 m^2, separated by a dis\tance of 0.01 m. If the capaci\tance of the capacitor is 10^-6 F, what is the charge stored on the capacitor when a potential difference of 10 V is applied across it?
A. 10^-7 C
B. 10^-6 C
C. 10^-5 C
D. 10^-4 C
Question 2
A 220 V AC supply is connected to a 100 Ω resistor. What is the current flowing through the resistor?
A. 2.2 A
B. 2.5 A
C. 3.0 A
D. 3.5 A
Question 3
A 10 μF capacitor is charged to a potential difference of 50 V. If the capacitor is connected to a 5 Ω resistor, what is the time cons\tant of the RC circuit?
A. 0.25 s
B. 0.5 s
C. 1 s
D. 2 s
Question 4
A light ray passes through a prism and is re\fracted. The angle of incidence is 30° and the angle of re\fraction is 40°. What is the angle of deviation?
A. 10°
B. 20°
C. 30°
D. 40°
Question 5
A parallel plate capacitor has a capaci\tance of 2 μF and is charged to a potential difference of 10 V. If the plates are separated by a dis\tance of 2 mm, what is the surface charge density?
A. 10 μC/m²
B. 20 μC/m²
C. 30 μC/m²
D. 40 μC/m²
Question 6
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 subject to a centripetal force of 12 N, what is the magnitude of the force?
A. 10 N
B. 12 N
C. 15 N
D. 20 N
Question 7
A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 5 Ω resistor connected in series. What is the total resis\tance of the circuit?
A. 35 Ω
B. 40 Ω
C. 45 Ω
D. 50 Ω
Question 8
A coil of wire with 100 turns is connected to a battery of 12 V. If the current in the coil is 2 A, what is the magnetic field strength at the center of the coil?
A. 0.01 T
B. 0.02 T
C. 0.03 T
D. 0.04 T
Question 9
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. -5 cm
B. -10 cm
C. -15 cm
D. -20 cm
Question 10
A 2.0 kg object is moving in a circular path with a radius of 0.5 m. If the object's speed is 4 m/s, calculate the centripetal force acting on the object.
A. 2 N
B. 4 N
C. 6 N
D. 8 N
Question 11
A 50 Hz AC voltage is applied to a circuit with a resis\tance of 10 Ω and an inductive reac\tance of 20 Ω. What is the impedance of the circuit?
A. 22 Ω
B. 24 Ω
C. 26 Ω
D. 28 Ω
Question 12
A radioactive sample decays at a rate of 0.05% per hour. If the initial activity is 1000 Bq, what is the activity after 5 hours?
A. 900 Bq
B. 950 Bq
C. 1000 Bq
D. 1050 Bq
Question 13
A ray of light passes from air into a glass of re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 30°
C. 40°
D. 50°
Question 14
A vector A has a magnitude of 5 units and makes an angle of 30° with the positive x-axis. What is the x-component of vector A?
A. 3.5 units
B. 4.5 units
C. 5.5 units
D. 6.5 units
Question 15
A 2 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and then released from rest. What is the maximum speed of the block?
A. 0.2 m/s
B. 0.4 m/s
C. 0.6 m/s
D. 0.8 m/s

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