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POST UTME UNILORIN 2025 Physics | Objective

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Question 1 View Details

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?

A. 6 N

Correct B. 8 N

C. 10 N

D. 12 N

Correct Answer: B

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Question 2 View Details

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

A. 10 m/s

Correct B. 20 m/s

C. 30 m/s

D. 40 m/s

Correct Answer: B

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Question 3 View Details

A block of mass 5 kg is placed on a horizontal surface. A force of 20 N is applied to the block, cau\sing it to accelerate at 2 m/s^2. What is the coefficient of kinetic friction between the block and the surface?

A. 0.2

Correct B. 0.4

C. 0.6

D. 0.8

Correct Answer: B

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Question 4 View Details

A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the current flowing through the circuit?

A. 1 A

Correct B. 2 A

C. 3 A

D. 4 A

Correct Answer: B

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Question 5 View Details

A particle is moving in a circular path with a cons\tant speed of 5 m/s. The radius of the path is 2 m. What is the magnitude of the force acting on the particle?

A. 10 N

Correct B. 20 N

C. 30 N

D. 40 N

Correct Answer: B

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Question 6 View Details

A 50 Hz, 200 V AC source is connected to a 100 Ω resistor. Calculate the rms value of the current flowing through the resistor.

A. 10 A

Correct B. 20 A

C. 30 A

D. 40 A

Correct Answer: B

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Question 7 View Details

A gas at 300 K and 1 atm expands to 3 times its original volume. Calculate the final pressure of the gas.

A. 0.33 atm

Correct B. 0.67 atm

C. 1 atm

D. 1.5 atm

Correct Answer: B

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Question 8 View Details

A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 5 Ω resistor connected in parallel. Calculate the equivalent resis\tance of the circuit.

A. 2.5 Ω

B. 5 Ω

Correct C. 7.5 Ω

D. 10 Ω

Correct Answer: C

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Question 9 View Details

A vector has a magnitude of 5 units and makes an angle of 30° with the positive x-axis. Calculate the x and y components of the vector.

Correct A. x-component: 4, y-component: 2.5

B. x-component: 3, y-component: 4

C. x-component: 2, y-component: 4.5

D. x-component: 1, y-component: 5

Correct Answer: A

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Question 10 View Details

A body is in equilibrium under the action of three forces. Two of the forces are 5 N and 10 N, acting at an angle of 60° to each other. The third force is 15 N, acting perp\endicular to the line of action of the other two forces. Calculate the magnitude of the resul\tant force.

A. 20 N

B. 25 N

Correct C. 30 N

D. 35 N

Correct Answer: C

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Question 11 View Details

A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. The particle is displaced by 0.5 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the angular frequency of the particle's motion.

A. 5 rad/s

Correct B. 10 rad/s

C. 15 rad/s

D. 20 rad/s

Correct Answer: B

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Question 12 View Details

A 10 μF capacitor is connected in series with a 5 kΩ resistor and a 20 V battery. Calculate the time cons\tant of the circuit.

Correct A. 0.1 s

B. 0.5 s

C. 1 s

D. 2 s

Correct Answer: A

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Question 13 View Details

A wave has a frequency of 50 Hz and a wavelength of 0.5 m. Calculate the speed of the wave.

A. 25 m/s

Correct B. 50 m/s

C. 75 m/s

D. 100 m/s

Correct Answer: B

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Question 14 View Details

A 100 W light bulb is connected to a 220 V power source. Calculate the current drawn by the bulb.

A. 0.45 A

Correct B. 0.5 A

C. 0.55 A

D. 0.6 A

Correct Answer: B

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Question 15 View Details

A particle of mass 1 kg is moving in a circular path with a radius of 2 m. If the particle's speed is 5 m/s, calculate the centripetal acceleration.

A. 1.25 m/s^2

Correct B. 2.5 m/s^2

C. 3.75 m/s^2

D. 5 m/s^2

Correct Answer: B

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Question 16 View Details

A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 20 V. If the dis\tance between the plates is doubled, what is the new potential difference?

A. 10 V

Correct B. 20 V

C. 40 V

D. 80 V

Correct Answer: B

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Question 17 View Details

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

A. 40°

B. 50°

Correct C. 60°

D. 70°

Correct Answer: C

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Question 18 View Details

A sound wave has a frequency of 200 Hz and a wavelength of 1.5 m. What is the speed of the sound wave?

A. 300 m/s

B. 400 m/s

Correct C. 500 m/s

D. 600 m/s

Correct Answer: C

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Question 19 View Details

A capacitor is connected to a battery and a resistor in series. If the capacitor is charged to a potential difference of 10 V and the resistor has a resis\tance of 5 Ω, what is the time cons\tant?

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 20 View Details

A ray of light passes through a lens and is focused at a dis\tance of 20 cm from the lens. If the object dis\tance is 30 cm, what is the focal length?

A. 10 cm

Correct B. 20 cm

C. 30 cm

D. 40 cm

Correct Answer: B

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Question 21 View Details

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 on each plate?

A. 0.2 C

Correct B. 0.4 C

C. 0.6 C

D. 0.8 C

Correct Answer: B

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Question 22 View Details

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 its acceleration?

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 23 View Details

A ray of light 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 24 View Details

A nucleus of mass number 240 and atomic number 94 undergoes \alpha decay. What is the mass number of the daughter nucleus?

Correct A. 236

B. 238

C. 240

D. 242

Correct Answer: A

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Question 25 View Details

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

A. Real and inverted

Correct B. Virtual and erect

C. Real and erect

D. Virtual and inverted

Correct Answer: B

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