POST UTME UNN 2019 Physics | Objective

Prepare for your exams with POST UTME UNN questions? Reviewing past/model questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2019 Physics (Objective) questions designed to simulate the real exam environment.

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Question 1 View Details
A radioactive sample undergoes \alpha decay with a half-life of 5 days. If the initial activity is 100 Bq, what is the activity after 10 days?
A. 50 Bq
B. 25 Bq
Correct C. 12.5 Bq
D. 6.25 Bq

Correct Answer: C

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Question 2 View Details
A gas at 300 K expands from 1 L to 2 L against a cons\tant external pressure of 1 atm. What is the work done by the gas?
A. -300 J
Correct B. -600 J
C. -900 J
D. -1200 J

Correct Answer: B

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Question 3 View Details
A particle of mass 1 kg is moving in a circular path with a radius of 2 m and a speed of 4 m/s. 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 4 View Details
A capacitor consists of two parallel plates, each with a surface area of 0.1 m^2. The plates are separated by a dis\tance of 0.01 m and are charged to a potential difference of 10 V. What is the capaci\tance?
A. 0.1 F
Correct B. 0.01 F
C. 0.001 F
D. 0.0001 F

Correct Answer: B

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Question 5 View Details
A simple harmonic motion has a maximum displacement of 2 m and a period of 4 s. What is the angular frequency?
A. 0.5 rad/s
B. 1 rad/s
Correct C. 2 rad/s
D. 4 rad/s

Correct Answer: C

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Question 6 View Details
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 0.2 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. 2.0 m/s
Correct B. 4.0 m/s
C. 6.0 m/s
D. 8.0 m/s

Correct Answer: B

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Question 7 View Details
A parallel plate capacitor consists of two plates, each of area 0.04 m^2, separated by a dis\tance of 0.02 m. The capaci\tance of the capacitor is 2.0 x 10^-9 F. If a potential difference of 10 V is applied across the capacitor, calculate the charge stored on each plate.
A. 2.0 x 10^-8 C
Correct B. 4.0 x 10^-8 C
C. 6.0 x 10^-8 C
D. 8.0 x 10^-8 C

Correct Answer: B

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Question 8 View Details
A sound wave with a frequency of 200 Hz and a wavelength of 0.5 m is traveling through a medium. If the speed of the wave is 340 m/s, calculate the amplitude of the wave.
A. 0.01 m
B. 0.02 m
Correct C. 0.03 m
D. 0.04 m

Correct Answer: C

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Question 9 View Details
A gas is contained in a cylinder of volume 0.05 m^3 at a temperature of 300 K. If the gas is heated to a temperature of 400 K, calculate the new volume of the gas, assuming the pressure remains cons\tant.
A. 0.06 m^3
B. 0.07 m^3
Correct C. 0.08 m^3
D. 0.09 m^3

Correct Answer: C

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Question 10 View Details
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60 degrees above the horizontal. If the acceleration due to gravity is 9.8 m/s^2, calculate the time of flight of the projectile.
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 11 View Details
A radioactive sample of Δ⁵² emits Δ⁵²⁴ particles. If the half-life of Δ⁵² is 5.27 × 10¹ years, what is the activity of the sample in Bq?
A. 1.00 × 10¹ Bq
B. 2.00 × 10¹ Bq
Correct C. 5.27 × 10¹ Bq
D. 1.05 × 10¹ Bq

Correct Answer: C

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Question 12 View Details
A parallel plate capacitor has a capaci\tance of 5.00 µF. If a potential difference of 12.0 V is applied across the plates, what is the charge stored on the capacitor?
A. 60.0 µC
B. 120.0 µC
Correct C. 240.0 µC
D. 480.0 µC

Correct Answer: C

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Question 13 View Details
A block of mass 2.00 kg is attached to a horizontal spring with a force cons\tant of 100 N/m. If the block is displaced by 0.200 m from its equilibrium position and released from rest, what is the maximum speed of the block?
A. 0.400 m/s
B. 0.800 m/s
Correct C. 1.00 m/s
D. 1.20 m/s

Correct Answer: C

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Question 14 View Details
A \tank is filled with water to a height of 10.0 m. If the density of water is 1000 kg/m³, what is the pressure at the bottom of the \tank?
A. 1.00 × 10µ Pa
Correct B. 1.00 × 10³ Pa
C. 1.00 × 10µ Pa
D. 1.00 × 10³ Pa

Correct Answer: B

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Question 15 View Details
A circuit consists of a 12.0 V battery, a 4.00 µF capacitor, and a 100 × 10³ µ resistor. If the switch is closed at time t = 0, what is the current in the circuit at time t = 5.00 ms?
A. 0.400 A
B. 0.800 A
Correct C. 1.00 A
D. 1.20 A

Correct Answer: C

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Question 16 View Details
A body of mass 2 kg is moving in a circular path with a cons\tant speed of 4 m/s. If the radius of the circular path is 3 m, calculate the magnitude of the centripetal acceleration of the body.
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 17 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
B. 20 V
Correct C. 40 V
D. 80 V

Correct Answer: C

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Question 18 View Details
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?
Correct A. 20°
B. 30°
C. 40°
D. 50°

Correct Answer: A

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Question 19 View Details
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?
Correct A. 50 Bq
B. 100 Bq
C. 200 Bq
D. 400 Bq

Correct Answer: A

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Question 20 View Details
A particle of mass 1 kg is moving in a straight line with a velocity of 5 m/s. If the particle experiences a force of 10 N, what is the acceleration?
A. 2 m/s^2
B. 5 m/s^2
Correct C. 10 m/s^2
D. 20 m/s^2

Correct Answer: C

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