POST UTME UNN 2019 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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
B. 4.0 x 10^-8 C
C. 6.0 x 10^-8 C
D. 8.0 x 10^-8 C
Question 2
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
B. 3.0 s
C. 4.0 s
D. 5.0 s
Question 3
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. 50 Bq
B. 100 Bq
C. 200 Bq
D. 400 Bq
Question 4
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
B. 4.0 m/s
C. 6.0 m/s
D. 8.0 m/s
Question 5
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
C. 240.0 µC
D. 480.0 µC
Question 6
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
B. 1.00 × 10³ Pa
C. 1.00 × 10µ Pa
D. 1.00 × 10³ Pa
Question 7
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
C. 40 V
D. 80 V
Question 8
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
C. 0.03 m
D. 0.04 m
Question 9
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
B. 0.01 F
C. 0.001 F
D. 0.0001 F
Question 10
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°
C. 40°
D. 50°
Question 11
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
C. 0.08 m^3
D. 0.09 m^3
Question 12
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
C. 10 m/s^2
D. 20 m/s^2
Question 13
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
C. 12.5 Bq
D. 6.25 Bq
Question 14
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
C. 1.00 A
D. 1.20 A
Question 15
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
C. 2 rad/s
D. 4 rad/s

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