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POST UTME UNIOSUN 2023 Physics | Objective

Are you preparing for POST UTME UNIOSUN exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2023 Physics (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

A uniform magnetic field of magnitude 2.0 T is directed along the positive z-axis. A current of 5.0 A flows in a circular loop of radius 0.20 m, placed in the x-y plane. What is the magnitude of the magnetic moment of the loop?

A. 0.10 A m^2

Correct B. 0.20 A m^2

C. 0.30 A m^2

D. 0.40 A m^2

Correct Answer: B

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Question 2

A point charge of +2.0 μC is placed at the origin. What is the electric potential at a point 0.50 m away from the charge, in the x-direction?

A. 1000 V

Correct B. 2000 V

C. 3000 V

D. 4000 V

Correct Answer: B

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Question 3

A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 30 Ω resistor connected in series. A voltage of 12 V is applied across the circuit. What is the current flowing through the circuit?

A. 0.50 A

B. 1.00 A

Correct C. 1.50 A

D. 2.00 A

Correct Answer: C

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Question 4

A particle of mass 2.0 kg is moving in a circular path with a radius of 0.50 m. The particle has a speed of 5.0 m/s. What is the magnitude of the centripetal force acting on the particle?

A. 10 N

B. 20 N

Correct C. 30 N

D. 40 N

Correct Answer: C

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Question 5

A block of mass 5.0 kg is placed on a frictionless surface. A force of 20 N is applied to the block, cau\sing it to accelerate at 2.0 m/s^2. What is the magnitude of the normal force acting on the block?

A. 10 N

Correct B. 20 N

C. 30 N

D. 40 N

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. If the particle is subject to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?

A. 4 m/s^2

B. 6 m/s^2

Correct C. 8 m/s^2

D. 10 m/s^2

Correct Answer: C

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Question 7

A wave has a frequency of 50 Hz and a wavelength of 0.2 m. What is the speed of the wave?

A. 5 m/s

Correct B. 10 m/s

C. 15 m/s

D. 20 m/s

Correct Answer: B

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Question 8

A gas is heated from 20°C to 80°C at cons\tant volume. If the initial pressure is 1 atm, what is the final pressure?

A. 2 atm

B. 3 atm

Correct C. 4 atm

D. 5 atm

Correct Answer: C

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Question 9

A vector has a magnitude of 5 units and makes an angle of 30° with the positive x-axis. What is the x-component of the vector?

Correct A. 4.33 units

B. 4.58 units

C. 4.83 units

D. 5.08 units

Correct Answer: A

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Question 10

A circuit consists of a 2 Ω resistor, a 3 Ω resistor, and a 4 Ω resistor connected in series. If a voltage of 12 V is applied across the circuit, what is the current in the circuit?

A. 1.33 A

B. 1.67 A

Correct C. 2 A

D. 2.33 A

Correct Answer: C

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Question 11

A uniform magnetic field of strength 0.5 T is applied along the z-axis. A current of 2 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?

Correct A. 0.02 A m^2

B. 0.1 A m^2

C. 0.5 A m^2

D. 1 A m^2

Correct Answer: A

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Question 12

A 12 V battery is connected to a 4 Ω resistor in series with a 6 Ω resistor. What is the current flowing through the 4 Ω resistor?

A. 0.5 A

Correct B. 1 A

C. 2 A

D. 3 A

Correct Answer: B

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Question 13

A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. It is displaced by 0.2 m from its equilibrium position and released from rest. What is the frequency of its oscillations?

A. 0.5 Hz

Correct B. 1 Hz

C. 2 Hz

D. 5 Hz

Correct Answer: B

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Question 14

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. 990 Bq

D. 1000 Bq

Correct Answer: A

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Question 15

A 50 Hz AC voltage is applied across a 10 Ω resistor. What is the rms value of the current flowing through the resistor?

A. 0.5 A

Correct B. 1 A

C. 2 A

D. 5 A

Correct Answer: B

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Question 16

A beam of light of wavelength 500 nm is incident on a glass slab of re\fractive index 1.5. If the angle of incidence is 30°, calculate the angle of re\fraction.

Correct A. 20°

B. 30°

C. 40°

D. 50°

Correct Answer: A

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Question 17

A particle of mass 2 kg is moving in a circular path of radius 3 m with a speed of 4 m/s. Calculate the magnitude of the centripetal force acting on the particle.

A. 10 N

B. 20 N

Correct C. 30 N

D. 40 N

Correct Answer: C

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Question 18

A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in parallel. Calculate the total resis\tance of the circuit.

A. 2 Ω

Correct B. 3 Ω

C. 4 Ω

D. 6 Ω

Correct Answer: B

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Question 19

A gas is heated from 20°C to 50°C at cons\tant pressure. Calculate the final volume of the gas if the initial volume is 2 L.

A. 4 L

B. 5 L

Correct C. 6 L

D. 8 L

Correct Answer: C

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Question 20

A lens of focal length 20 cm is used to form an image of an object at a dis\tance of 30 cm from the lens. Calculate the magnification of the lens.

A. 1

Correct B. 2

C. 3

D. 4

Correct Answer: B

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Question 21

A particle of mass 1 kg is moving in a circular path of radius 2 m with a speed of 3 m/s. Calculate the magnitude of the centripetal acceleration of the particle.

A. 1 m/s^2

B. 2 m/s^2

Correct C. 3 m/s^2

D. 4 m/s^2

Correct Answer: C

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Question 22

A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. Calculate the total resis\tance of the circuit.

A. 8 Ω

B. 10 Ω

Correct C. 12 Ω

D. 14 Ω

Correct Answer: C

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Question 23

A gas is heated from 20°C to 50°C at cons\tant volume. Calculate the final pressure of the gas if the initial pressure is 2 atm.

A. 4 atm

B. 5 atm

C. 6 atm

D. 8 atm

Correct Answer: VIEW ANSWER

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Question 24

A point charge of +2 μC is placed at the origin. A second point charge of -3 μC is placed 0.5 m away from the first charge. What is the magnitude of the electric field at a point 0.2 m away from the second charge, in the direction of the second charge?

A. 2.5 × 10^4 N/C

B. 5.0 × 10^4 N/C

Correct C. 1.0 × 10^5 N/C

D. 2.0 × 10^5 N/C

Correct Answer: C

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Question 25

A lens of focal length 20 cm is placed in a beam of light. The beam is parallel to the principal axis. What is the nature of the image formed by the lens?

Correct A. Real and inverted

B. Virtual and upright

C. Real and upright

D. Virtual and inverted

Correct Answer: A

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