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POST UTME UNILORIN 2023 Physics | Objective

Are you preparing for POST UTME UNILORIN 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 50 Hz, 200 V AC supply is connected to a series RLC circuit with R = 10 Ω, L = 0.1 H, and C = 20 μF. Determine the impedance of the circuit.

A. 20 Ω

Correct B. 30 Ω

C. 40 Ω

D. 50 Ω

Correct Answer: B

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Question 2

A source of sound produces a wave with a frequency of 200 Hz. If the speed of sound in air is 340 m/s, calculate the wavelength of the sound wave.

Correct A. 1.7 m

B. 1.8 m

C. 1.9 m

D. 2.0 m

Correct Answer: A

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Question 3

A radioactive sample decays from 100 g to 50 g in 10 days. Calculate the half-life of the sample.

A. 5 days

Correct B. 10 days

C. 15 days

D. 20 days

Correct Answer: B

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Question 4

A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle has a speed of 4 m/s, calculate 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 photon of energy 2 eV is incident on a metal surface. If the work function of the metal is 1 eV, calculate the maximum kinetic energy of the electron emitted.

A. 1 eV

Correct B. 2 eV

C. 3 eV

D. 4 eV

Correct Answer: B

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Question 6

A block of mass 5 kg is attached to a horizontal, massless spring with a force cons\tant of 200 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the maximum speed of the block as it passes through the equilibrium position.

A. 1.5 m/s

Correct B. 2.0 m/s

C. 2.5 m/s

D. 3.0 m/s

Correct Answer: B

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Question 7

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. Calculate the magnitude of the centripetal acceleration of the particle.

A. 1.6 m/s^2

B. 2.0 m/s^2

Correct C. 2.4 m/s^2

D. 3.0 m/s^2

Correct Answer: C

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Question 8

A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 12 V. Calculate the energy stored in the capacitor.

A. 0.72 J

Correct B. 1.0 J

C. 1.2 J

D. 1.5 J

Correct Answer: B

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Question 9

A 10 μC charge is placed at the center of a circular loop of radius 2 m. Calculate the electric field at a point on the loop 30° from the positive x-axis.

A. 2.0 × 10^4 N/C

Correct B. 4.0 × 10^4 N/C

C. 6.0 × 10^4 N/C

D. 8.0 × 10^4 N/C

Correct Answer: B

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Question 10

A 5 μF capacitor is connected in series with a 10 kΩ resistor. Calculate the time cons\tant of the circuit.

A. 0.05 s

Correct B. 0.1 s

C. 0.2 s

D. 0.5 s

Correct Answer: B

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Question 11

A 2.5 mH inductor is connected in series with a 10 V, 50 Hz AC source. Assuming the inductor has zero initial current, calculate the maximum value of the current in the circuit.

A. 0.2 A

B. 0.5 A

Correct C. 1.0 A

D. 2.0 A

Correct Answer: C

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Question 12

A particle of mass 0.5 kg is projected from the origin with an initial velocity of 20 m/s at an angle of 60° to the horizontal. Calculate the time of flight.

A. 2.0 s

Correct B. 3.0 s

C. 4.0 s

D. 5.0 s

Correct Answer: B

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Question 13

A parallel plate capacitor consists of two plates, each of area 0.01 m², separated by a dis\tance of 0.001 m. The capaci\tance is 10 nF. Calculate the potential difference between the plates when a charge of 0.01 C is stored.

A. 10 V

Correct B. 20 V

C. 30 V

D. 40 V

Correct Answer: B

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Question 14

A convex lens of focal length 0.2 m forms an image of a dis\tant object. Calculate the magnification of the image.

A. 2.0

B. 3.0

Correct C. 4.0

D. 5.0

Correct Answer: C

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Question 15

A body of mass 0.5 kg is heated from 20°C to 80°C. Calculate the change in entropy.

A. 0.1 J/K

Correct B. 0.2 J/K

C. 0.3 J/K

D. 0.4 J/K

Correct Answer: B

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Question 16

A gas is contained in a cylinder of volume 2.5 liters at a temperature of 300 K. If the pressure of the gas is increased to 2 atm, what is the new volume of the gas, assuming the gas obeys Boyle's Law?

Correct A. 1.25 liters

B. 2.5 liters

C. 5 liters

D. 10 liters

Correct Answer: A

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Question 17

A particle of mass 0.5 kg is moving in a circular path of radius 2 m with a speed of 4 m/s. What is the magnitude of the centripetal acceleration of the particle?

A. 4 m/s^2

B. 8 m/s^2

Correct C. 16 m/s^2

D. 32 m/s^2

Correct Answer: C

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Question 18

A circuit consists of a 12 V battery, a 4 Ω resistor, and a 2 Ω resistor connected in series. What is the current flowing through the circuit?

A. 0.5 A

B. 1 A

Correct C. 2 A

D. 3 A

Correct Answer: C

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Question 19

A wave has a frequency of 50 Hz and a wavelength of 2 m. What is the speed of the wave?

A. 100 m/s

Correct B. 200 m/s

C. 500 m/s

D. 1000 m/s

Correct Answer: B

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Question 20

A particle of mass 1 kg is moving in a straight line with an initial velocity of 5 m/s. If the particle experiences a force of 10 N for 2 seconds, what is the final velocity of the particle?

A. 10 m/s

B. 15 m/s

Correct C. 20 m/s

D. 25 m/s

Correct Answer: C

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Question 21

A circuit consists of a 9 V battery, a 6 Ω resistor, and a 3 Ω resistor connected in parallel. What is the total resis\tance of the circuit?

A. 1.5 Ω

Correct B. 2 Ω

C. 3 Ω

D. 4 Ω

Correct Answer: B

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Question 22

A wave has a frequency of 20 Hz and a speed of 50 m/s. What is the wavelength of the wave?

A. 1 m

B. 2 m

Correct C. 5 m

D. 10 m

Correct Answer: C

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Question 23

A particle of mass 0.2 kg is moving in a circular path of radius 1 m with a speed of 3 m/s. What is the magnitude of the centripetal acceleration of the particle?

A. 1 m/s^2

B. 2 m/s^2

C. 3 m/s^2

D. 4 m/s^2

Correct Answer: VIEW ANSWER

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Question 24

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. 2 m/s^2

B. 4 m/s^2

Correct C. 6 m/s^2

D. 8 m/s^2

Correct Answer: C

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Question 25

A wave has a frequency of 50 Hz and a wavelength of 0.2 m. If the wave is traveling in the positive x-direction, what is the direction of the group velocity?

Correct A. Positive x-direction

B. Negative x-direction

C. Positive y-direction

D. Negative y-direction

Correct Answer: A

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