POST UTME KSU 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in parallel. Calculate the total resis\tance of the circuit.
A. 2 Ω
B. 3 Ω
C. 4 Ω
D. 6 Ω
Question 2
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 3
A 10 μF capacitor is connected in parallel with a 20 μF capacitor. What is the equivalent capaci\tance of the circuit?
A. 10 μF
B. 15 μF
C. 20 μF
D. 30 μF
Question 4
A radioactive sample emits \alpha particles with a half-life of 5 days. If the initial activity is 100 Bq, what is the activity after 15 days?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 5
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 6
A 100 W light bulb is connected to a 220 V power source. What is the current drawn by the bulb?
A. 0.25 A
B. 0.5 A
C. 0.75 A
D. 1.0 A
Question 7
A radioactive sample of Uranium-238 undergoes \alpha decay. If the initial mass of the sample is 100 g, and the mass of the \alpha particle is 4 u, what is the mass of the daughter nucleus after 10 half-lives?
A. 36 g
B. 40 g
C. 44 g
D. 48 g
Question 8
A particle of mass 2.0 kg is moving in a circular path of radius 3.0 m with a cons\tant speed of 4.0 m/s. What is the magnitude of the net force acting on the particle?
A. 8.0 N
B. 10.0 N
C. 12.0 N
D. 15.0 N
Question 9
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 20 V. If a dielectric slab of thickness 2 mm and dielectric cons\tant 3 is inserted between the plates, what is the new capaci\tance?
A. 30 μF
B. 40 μF
C. 50 μF
D. 60 μF
Question 10
A particle of mass 2 kg is moving in a circular path with a radius of 3 m and a speed of 4 m/s. What is the centripetal force acting on the particle?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 11
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in parallel. Calculate the total current drawn from the battery.
Question 12
A sound wave with a frequency of 200 Hz is traveling through a medium with a speed of 340 m/s. What is the wavelength of the sound wave?
A. 1.7 m
B. 1.8 m
C. 1.9 m
D. 2.0 m
Question 13
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 14
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 15
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 0.2 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
B. 10 rad/s
C. 20 rad/s
D. 50 rad/s

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