POST UTME COVENANT UNIVERSITY 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
A magnetic field of 0.5 T is applied to a coil of wire with 100 turns. If the coil has an area of 0.1 m^2, what is the magnetic flux through the coil?
A. 0.05 Wb
B. 0.1 Wb
C. 0.15 Wb
D. 0.2 Wb
Question 3
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 4
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 5
A 10 μF capacitor is connected in series with a 20 Ω resistor. If a 12 V battery is connected across the circuit, calculate the time cons\tant of the circuit.
A. 0.2 s
B. 0.4 s
C. 0.6 s
D. 0.8 s
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 subjected to a centripetal acceleration of 2 m/s^2, what is the magnitude of the force acting on the particle?
A. 8 N
B. 16 N
C. 32 N
D. 64 N
Question 7
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 8
A radioactive sample of Uranium-238 decays into Thorium-234 with a half-life of 4.5 billion years. If the initial activity of the sample is 100 Bq, what is the activity after 9 billion years?
A. 0.0625 Bq
B. 0.125 Bq
C. 0.25 Bq
D. 0.5 Bq
Question 9
A thermodynamic system undergoes a process from state A to state B. If the system's internal energy increases by 100 J and the heat added to the system is 150 J, what is the work done on the system?
A. 50 J
B. 100 J
C. 150 J
D. 200 J
Question 10
A block of mass 5 kg is placed on a horizontal surface with a coefficient of friction μ = 0.5. If a force of 20 N is applied to the block, what is the acceleration of the block?
A. 0.5 m/s^2
B. 1 m/s^2
C. 2 m/s^2
D. 4 m/s^2
Question 11
A magnetic field of magnitude 0.5 T is directed along the positive z-axis. A current of 2 A is flowing in a wire loop of radius 0.1 m. What is the magnitude of the magnetic moment of the loop?
A. 0.1 A·m²
B. 0.2 A·m²
C. 0.3 A·m²
D. 0.4 A·m²
Question 12
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 13
A gas is enclosed in a container with a movable piston. The gas is heated, cau\sing its pressure to increase. Which of the following best describes the change in the gas's volume?
A. The volume increases.
B. The volume decreases.
C. The volume remains cons\tant.
D. The volume becomes zero.
Question 14
A particle of mass 1 kg is moving in a circular path of radius 2 m with a cons\tant speed of 3 m/s. If the particle is subjected to a centripetal acceleration of 1 m/s^2, what is the magnitude of the force acting on the particle?
A. 6 N
B. 12 N
C. 18 N
D. 24 N
Question 15
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

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