POST UTME KSU 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A gas occupies a volume of 2.0 L at a pressure of 1.0 atm. What is the pressure of the gas if its volume is reduced to 1.0 L?
A. 2.0 atm
B. 3.0 atm
C. 4.0 atm
D. 5.0 atm
Question 2
A photon of energy 2 eV is incident on a metal surface with a work function of 1 eV. Calculate the kinetic energy of the emitted electron.
A. 1 eV
B. 2 eV
C. 3 eV
D. 4 eV
Question 3
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 centripetal acceleration of the particle?
A. 16 m/s^2
B. 12 m/s^2
C. 20 m/s^2
D. 24 m/s^2
Question 4
A light ray 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°
B. 25°
C. 30°
D. 35°
Question 5
A particle of mass 1 kg is moving in a circular path of radius 2 m with a speed of 4 m/s. Calculate the centripetal force acting on the particle.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 6
A ray of light passes from a glass of re\fractive index 1.5 into air. If the angle of incidence is 45°, what is the angle of re\fraction?
A. 30°
B. 35°
C. 40°
D. 45°
Question 7
A quantum particle has a wave function given by \psi(x) = Ae^{ikx}. If the particle is in a one-dimensional box of length L, calculate the normalization cons\tant A.
A. \sqrt{\frac{1}{L}}
B. \sqrt{\frac{2}{L}}
C. \sqrt{\frac{3}{L}}
D. \sqrt{\frac{4}{L}}
Question 8
A quantum particle has a wave function given by \psi(x) = Ae^{ikx}. If the particle is in a one-dimensional box of length L, calculate the momentum of the particle.
A. \hbar k
B. \frac{\hbar k}{2}
C. \frac{\hbar k}{3}
D. \frac{\hbar k}{4}
Question 9
A 10 μF capacitor is connected in series with a 5 Ω resistor and a 120 V AC source. If the frequency of the AC source is 50 Hz, calculate the impedance of the circuit.
A. 10 Ω
B. 20 Ω
C. 30 Ω
D. 40 Ω
Question 10
A radioactive sample has a half-life of 10 years. If the initial activity of the sample is 1000 Bq, calculate the activity of the sample after 20 years.
A. 125 Bq
B. 250 Bq
C. 500 Bq
D. 1000 Bq
Question 11
A gas has a pressure of 100 kPa and a volume of 2 m^3. What is the temperature of the gas?
A. 300 K
B. 400 K
C. 500 K
D. 600 K
Question 12
A gas at 300 K and 1 atm expands from 10 L to 20 L. Calculate the work done by the gas u\sing the ideal gas law.
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 13
A particle of mass 1 kg is moving in a straight line with an initial velocity of 5 m/s. If it experiences a cons\tant acceleration of 2 m/s^2, what is its velocity after 3 s?
A. 13 m/s
B. 15 m/s
C. 17 m/s
D. 19 m/s
Question 14
A convex lens of focal length 20 cm forms an image of an object at a dis\tance of 30 cm. Calculate the magnification of the lens.
A. 0.5
B. 1
C. 1.5
D. 2
Question 15
A 5 μF capacitor is connected in series with a 10 kΩ resistor. If a 9 V battery is connected across the circuit, what is the time cons\tant of the circuit?
A. 0.05 s
B. 0.1 s
C. 0.5 s
D. 1 s

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