POST UTME UNN 2019 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
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 3
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
B. -600 J
C. -900 J
D. -1200 J
Question 4
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
C. 1.00 m/s
D. 1.20 m/s
Question 5
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 6
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 7
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 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 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 10
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 11
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
C. 6 m/s^2
D. 8 m/s^2
Question 12
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 13
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
C. 5.27 × 10¹ Bq
D. 1.05 × 10¹ Bq
Question 14
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 15
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

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