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POST UTME UNN 2023 Physics | Objective

Are you preparing for POST UTME UNN 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.

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Question 1

A block of mass 2 kg is attached to a spring with spring cons\tant 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released from rest, what is the maximum speed of the block?

A. 2 m/s

Correct B. 4 m/s

C. 6 m/s

D. 8 m/s

Correct Answer: B

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Question 2

A light ray passes from air into a glass slab of re\fractive index 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 3

A radioactive sample decays at a rate of 0.05% per hour. If the initial mass of the sample is 100 g, what is the mass of the sample after 5 hours?

Correct A. 90 g

B. 95 g

C. 99 g

D. 100 g

Correct Answer: A

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Question 4

A sound wave with frequency 200 Hz and amplitude 0.5 m is traveling through a medium with speed 340 m/s. If the wave is reflected from a rigid wall, what is the maximum displacement of the wave at the wall?

A. 0.5 m

Correct B. 1 m

C. 1.5 m

D. 2 m

Correct Answer: B

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Question 5

A particle of mass 1 kg is moving in a circular path with radius 2 m and speed 4 m/s. If the particle is subject to a centripetal force of 10 N, what is the acceleration of the particle?

A. 2 m/s^2

Correct B. 4 m/s^2

C. 6 m/s^2

D. 8 m/s^2

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 subjected to a centripetal acceleration of 2 m/s^2, what is the force exerted on the particle?

A. 10 N

Correct B. 12 N

C. 15 N

D. 20 N

Correct Answer: B

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Question 7

A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If the acceleration due to gravity is 9.8 m/s^2, what is the maximum height reached by the projectile?

A. 10 m

B. 15 m

Correct C. 20 m

D. 25 m

Correct Answer: C

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Question 8

A body of mass 5 kg is moving with a velocity of 10 m/s. If it is subjected to a force of 20 N, what is the acceleration produced?

A. 2 m/s^2

B. 4 m/s^2

C. 6 m/s^2

Correct D. 8 m/s^2

Correct Answer: D

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Question 9

A simple harmonic motion has a time period of 2 s and an amplitude of 5 m. If the initial phase angle is 30°, what is the equation of motion?

Correct A. y = 5 \sin\( πt - π/6 \)

B. y = 5 \sin\( πt + π/6 \)

C. y = 5 \sin\( πt - π/3 \)

D. y = 5 \sin\( πt + π/3 \)

Correct Answer: A

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Question 10

A radioactive subs\tance has a half-life of 10 years. If the initial activity is 100 Bq, what is the activity after 20 years?

A. 25 Bq

Correct B. 50 Bq

C. 75 Bq

D. 100 Bq

Correct Answer: B

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Question 11

A gas at 300 K is heated to 500 K. If the initial volume is 2.5 L, what is the final volume if the gas obeys Charles' Law?

A. 5.0 L

Correct B. 6.25 L

C. 7.5 L

D. 10.0 L

Correct Answer: B

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Question 12

A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 20 V is applied across it, what is the charge stored?

Correct A. 200 μC

B. 400 μC

C. 600 μC

D. 800 μC

Correct Answer: A

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Question 13

A current of 5 A flows through a resistor of 10 Ω. What is the power dissipated?

A. 25 W

Correct B. 50 W

C. 75 W

D. 100 W

Correct Answer: B

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Question 14

A photon has an energy of 2.5 eV. What is its wavelength?

A. 500 nm

Correct B. 750 nm

C. 1000 nm

D. 1250 nm

Correct Answer: B

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Question 15

A circuit consists of a 5 Ω resistor and a 10 Ω resistor in series. If a current of 2 A flows through the circuit, what is the potential difference across the 10 Ω resistor?

A. 10 V

B. 20 V

Correct C. 30 V

D. 40 V

Correct Answer: C

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Question 16

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 statements is true about the gas?

Correct A. The gas expands and its volume increases.

B. The gas contracts and its volume decreases.

C. The gas remains at cons\tant volume.

D. The gas expands and its pressure decreases.

Correct Answer: A

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Question 17

A particle of mass 2 kg is moving in a circular path with a cons\tant speed of 4 m/s. The radius of the circle is 3 m. What is the magnitude of the centripetal 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 18

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

A. 1 A

Correct B. 2 A

C. 3 A

D. 4 A

Correct Answer: B

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Question 19

A magnetic field is directed into the page. A wire carrying a current of 2 A is placed in the magnetic field. The force on the wire is 0.5 N. What is the angle between the wire and the magnetic field?

A. 30°

B. 45°

Correct C. 60°

D. 90°

Correct Answer: C

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Question 20

A block of mass 5 kg is attached to a spring with a spring cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released. What is the maximum speed of the block?

A. 2 m/s

B. 4 m/s

Correct C. 6 m/s

D. 8 m/s

Correct Answer: C

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Question 21

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 force of 12 N, what is the acceleration of the particle?

Correct A. 6 m/s^2

B. 12 m/s^2

C. 24 m/s^2

D. 48 m/s^2

Correct Answer: A

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Question 22

A light ray passes through a prism and is re\fracted. If the angle of incidence is 30° and the angle of re\fraction is 20°, what is the angle of deviation?

Correct A. 10°

B. 20°

C. 30°

D. 40°

Correct Answer: A

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Question 23

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

Correct A. 10 Ω

B. 12 Ω

C. 14 Ω

D. 16 Ω

Correct Answer: A

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Question 24

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

A. 50 m/s

Correct B. 100 m/s

C. 150 m/s

D. 200 m/s

Correct Answer: B

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Question 25

A particle is moving in a circular path with a cons\tant speed of 5 m/s. If the radius of the path is 2 m, what is the centripetal acceleration of the particle?

A. 10 m/s^2

Correct B. 12.5 m/s^2

C. 15 m/s^2

D. 20 m/s^2

Correct Answer: B

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