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POST UTME RSU 2025 Physics | Objective

Are you preparing for POST UTME RSU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2025 Physics (Objective) questions designed to simulate the real exam environment.

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Question 1

A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. The capaci\tance is 2.5 nF. If the potential difference between the plates is increased to 10 V, what is the new charge on the plates?

A. 62.5 nC

Correct B. 125 nC

C. 250 nC

D. 500 nC

Correct Answer: B

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Question 2

A circuit consists of a 12 V battery, a 4 Ω resistor, and an inductor of 2 H. If the switch is closed at t = 0, what is the current in the circuit at t = 2 s?

A. 0.5 A

B. 1 A

Correct C. 2 A

D. 4 A

Correct Answer: C

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Question 3

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

A. 20°

B. 30°

Correct C. 40°

D. 50°

Correct Answer: C

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Question 4

A magnetic field of 0.5 T is applied to a coil of 100 turns and radius 0.1 m. If the current in the coil is 2 A, what is the torque on the coil?

A. 0.1 Nm

B. 0.2 Nm

Correct C. 0.5 Nm

D. 1 Nm

Correct Answer: C

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Question 5

A current of 5 A flows through a wire of resis\tance 2 Ω. If the voltage across the wire is 10 V, what is the power consumed?

A. 25 W

B. 50 W

Correct C. 100 W

D. 200 W

Correct Answer: C

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Question 6

A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the dielectric cons\tant of the material between the plates is 3, calculate the capaci\tance.

Correct A. 0.01 F

B. 0.02 F

C. 0.03 F

D. 0.04 F

Correct Answer: A

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Question 7

A light ray passes through a convex lens of focal length 0.2 m. If the object dis\tance is 0.5 m, calculate the image dis\tance.

A. 0.33 m

B. 0.5 m

Correct C. 0.67 m

D. 0.8 m

Correct Answer: C

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Question 8

A particle of mass 0.5 kg is moving in a circular path of radius 0.2 m with a speed of 2 m/s. Calculate the centripetal force.

A. 0.1 N

Correct B. 0.2 N

C. 0.3 N

D. 0.4 N

Correct Answer: B

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Question 9

A heat engine operates between the temperatures 300 K and 600 K. If the efficiency is 30%, calculate the work done per cycle.

A. 100 J

B. 200 J

Correct C. 300 J

D. 400 J

Correct Answer: C

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Question 10

A photon of energy 2 eV is incident on a metal surface with work function 1.5 eV. Calculate the maximum kinetic energy of the emitted electron.

A. 0.5 eV

Correct B. 1 eV

C. 1.5 eV

D. 2 eV

Correct Answer: B

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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 statements is true about the change in the gas's internal energy?

Correct A. The internal energy increases

B. The internal energy decreases

C. The internal energy remains cons\tant

D. The internal energy increases, but the change is not related to the work done

Correct Answer: A

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Question 12

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?

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 13

A 10 μF capacitor is connected in series with a 20 Ω resistor. A 12 V battery is connected across the circuit. What is the current in the circuit?

A. 0.6 A

Correct B. 0.8 A

C. 1.2 A

D. 1.5 A

Correct Answer: B

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Question 14

A 5 kg block is moving with a velocity of 2 m/s. It collides with a 3 kg block that is initially at rest. After the collision, the 5 kg block has a velocity of 1 m/s. What is the velocity of the 2 kg block after the collision?

A. 0.5 m/s

B. 1 m/s

Correct C. 1.5 m/s

D. 2 m/s

Correct Answer: C

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Question 15

A 100 μF capacitor is connected in parallel with a 200 μF capacitor. A 12 V battery is connected across the circuit. What is the equivalent capaci\tance?

A. 50 μF

B. 100 μF

C. 200 μF

Correct D. 300 μF

Correct Answer: D

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Question 16

A light ray passes from air into a glass slab of thickness 2.5 cm and re\fractive index 1.5. If the angle of incidence is 30°, calculate the angle of re\fraction.

A. 20°

Correct B. 25°

C. 30°

D. 35°

Correct Answer: B

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Question 17

A 100 Hz tuning fork is placed near a stationary observer. If the observer moves towards the tuning fork at a speed of 5 m/s, calculate the frequency heard by the observer.

A. 105 Hz

Correct B. 110 Hz

C. 115 Hz

D. 120 Hz

Correct Answer: B

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Question 18

A 2 kg block is attached to a horizontal spring with a force cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released, calculate 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 19

A 10 μF capacitor is connected in series with a 5 kΩ resistor. If a 10 V battery is connected across the circuit, calculate the time cons\tant of the circuit.

A. 0.5 s

Correct B. 1 s

C. 2 s

D. 5 s

Correct Answer: B

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Question 20

A 50 Hz AC voltage is applied across a 20 Ω resistor. If the maximum current is 5 A, calculate the power consumed by the resistor.

A. 250 W

Correct B. 500 W

C. 750 W

D. 1000 W

Correct Answer: B

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Question 21

A 2.0 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. The block is displaced by 0.20 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, calculate the maximum speed of the block as it passes through the equilibrium position.

A. 0.50 m/s

Correct B. 1.00 m/s

C. 1.50 m/s

D. 2.00 m/s

Correct Answer: B

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Question 22

A projectile is launched from the origin with an initial velocity of 20 m/s at an angle of 60° above the horizontal. Assuming the only force acting on the projectile is gravity, calculate the time of flight.

A. 2.00 s

Correct B. 4.00 s

C. 6.00 s

D. 8.00 s

Correct Answer: B

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Question 23

A gas occupies a volume of 2.0 L at a pressure of 1.0 atm. If the temperature is increased to 300 K, calculate the new volume of the gas.

A. 2.5 L

B. 3.0 L

Correct C. 3.5 L

D. 4.0 L

Correct Answer: C

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Question 24

A 5.0 kg block is moving at a speed of 2.0 m/s on a frictionless surface. If a force of 10 N is applied to the block, calculate the acceleration of the block.

A. 0.50 m/s^2

B. 1.00 m/s^2

C. 1.50 m/s^2

Correct D. 2.00 m/s^2

Correct Answer: D

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Question 25

A 10 kg block is attached to a horizontal, massless spring with a force cons\tant of 50 N/m. The block is displaced by 0.10 m from its equilibrium position and released from rest. Assuming the block undergoes simple harmonic motion, calculate the maximum speed of the block as it passes through the equilibrium position.

A. 0.25 m/s

B. 0.50 m/s

C. 0.75 m/s

Correct D. 1.00 m/s

Correct Answer: D

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