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POST UTME COVENANT UNIVERSITY 2020 Physics | Objective

Are you preparing for POST UTME COVENANT UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Physics (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

A parallel plate capacitor has a capaci\tance of 2.5 μF. If a potential difference of 10 V is applied across it, what is the charge stored on each plate?

Correct A. 25 μC

B. 50 μC

C. 75 μC

D. 100 μC

Correct Answer: A

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Question 2

A current of 5 A flows through a wire of resis\tance 10 Ω. What is the power dissipated in the wire?

Correct A. 25 W

B. 50 W

C. 75 W

D. 100 W

Correct Answer: A

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Question 3

A radioactive sample decays at a rate of 0.5% per hour. If the initial mass of the sample is 100 g, what is the mass remaining after 5 hours?

A. 50 g

B. 75 g

Correct C. 87.5 g

D. 100 g

Correct Answer: C

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Question 4

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

Correct B. 1 m/s^2

C. 2 m/s^2

D. 4 m/s^2

Correct Answer: B

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Question 5

A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 5 Ω resistor connected in series. If a voltage of 20 V is applied across the circuit, what is the current flowing through the 5 Ω resistor?

A. 0.5 A

Correct B. 1 A

C. 2 A

D. 4 A

Correct Answer: B

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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. What is the magnitude of the force acting on the particle, if the force is directed towards the center of the circle?

A. 8 N

B. 12 N

Correct C. 16 N

D. 20 N

Correct Answer: C

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Question 7

A light ray passes from air into a glass block with a re\fractive index of 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?

A. 20°

Correct B. 25°

C. 30°

D. 35°

Correct Answer: B

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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

Correct C. 0.03 T

D. 0.04 T

Correct Answer: C

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Question 9

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?

Correct A. 900 Bq

B. 950 Bq

C. 1000 Bq

D. 1050 Bq

Correct Answer: A

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Question 10

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

Correct C. 26 Ω

D. 28 Ω

Correct Answer: C

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Question 11

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.

Correct B. The volume decreases.

C. The volume remains cons\tant.

D. The volume becomes zero.

Correct Answer: B

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Question 12

A particle is moving in a straight line with a cons\tant acceleration of 2 m/s^2. If the particle's initial velocity is 4 m/s, what is its velocity after 3 seconds?

A. 10 m/s

B. 12 m/s

Correct C. 14 m/s

D. 16 m/s

Correct Answer: C

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Question 13

A convex lens of focal length 20 cm is used to form an image of an object placed 30 cm in front of it. What is the nature of the image formed?

Correct A. Real and inverted

B. Virtual and erect

C. Real and erect

D. Virtual and inverted

Correct Answer: A

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Question 14

A resistor of 2 ohms is connected in series with a resistor of 3 ohms. What is the equivalent resis\tance of the circuit?

A. 1 ohm

B. 2 ohms

C. 3 ohms

Correct D. 5 ohms

Correct Answer: D

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Question 15

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°

Correct B. 20°

C. 30°

D. 40°

Correct Answer: B

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Question 16

A 5.0 kg block is attached to a horizontal, massless spring with a force cons\tant of 200 N/m. The block is displaced by 0.15 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, calculate the maximum speed of the block.

A. 1.5 m/s

B. 2.0 m/s

Correct C. 2.5 m/s

D. 3.0 m/s

Correct Answer: C

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Question 17

A parallel plate capacitor consists of two plates, each of area 0.02 m^2, separated by a dis\tance of 0.005 m. The capaci\tance of the capacitor is 10 nF. If a potential difference of 50 V is applied across the plates, calculate the charge stored on each plate.

A. 0.5 C

Correct B. 1.0 C

C. 1.5 C

D. 2.0 C

Correct Answer: B

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Question 18

A magnetic field of 0.5 T is applied to a current-carrying wire of length 0.2 m. If the current in the wire is 2 A, calculate the force exerted on the wire.

A. 0.1 N

B. 0.2 N

Correct C. 0.3 N

D. 0.4 N

Correct Answer: C

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Question 19

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

Correct C. 6 N

D. 8 N

Correct Answer: C

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Question 20

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

Correct B. 0.4 s

C. 0.6 s

D. 0.8 s

Correct Answer: B

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Question 21

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

Correct B. 100 J

C. 150 J

D. 200 J

Correct Answer: B

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Question 22

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?

Correct A. 3.5 units

B. 4.5 units

C. 5.5 units

D. 6.5 units

Correct Answer: A

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Question 23

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

Correct C. 45 Ω

D. 50 Ω

Correct Answer: C

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Question 24

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

Correct B. 0.1 Wb

C. 0.15 Wb

D. 0.2 Wb

Correct Answer: B

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Question 25

A 220 V AC supply is connected to a 100 Ω resistor. What is the current flowing through the resistor?

Correct A. 2.2 A

B. 2.5 A

C. 3.0 A

D. 3.5 A

Correct Answer: A

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