POST UTME LEAD CITY UNIVERSITY 2022 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2 kg object is moving in a circular path with a cons\tant speed of 4 m/s. The object is subject to a centripetal force of 12 N. What is the magnitude of the acceleration of the object?
A. 1.5 m/s^2
B. 2.0 m/s^2
C. 2.5 m/s^2
D. 3.0 m/s^2
Question 2
A heat engine operates between a temperature of 500 K and 300 K. What is the maximum efficiency of the engine?
A. 0.4
B. 0.5
C. 0.6
D. 0.7
Question 3
A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 5 Ω resistor connected in series. If a voltage of 12 V is applied across the circuit, calculate the current flowing through the circuit.
A. 0.4 A
B. 0.6 A
C. 0.8 A
D. 1 A
Question 4
A block of mass 5 kg is attached to a spring with a spring cons\tant of 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released, calculate the maximum kinetic energy of the block.
A. 10 J
B. 20 J
C. 50 J
D. 100 J
Question 5
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. If the particle is subjected to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?
A. 4 m/s^2
B. 8 m/s^2
C. 12 m/s^2
D. 16 m/s^2
Question 6
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. If the particle is subjected to a centripetal force of 12 N, what is the magnitude of the force?
A. 10 N
B. 12 N
C. 15 N
D. 20 N
Question 7
A car is traveling at a speed of 25 m/s. If the driver applies the brakes and the car comes to rest in 4 s, what is the magnitude of the acceleration of the car?
A. 3 m/s^2
B. 6 m/s^2
C. 9 m/s^2
D. 12 m/s^2
Question 8
A radioactive sample has an initial activity of 100 Bq. If the half-life of the sample is 10 days, calculate the activity after 30 days.
A. 25 Bq
B. 50 Bq
C. 75 Bq
D. 100 Bq
Question 9
A parallel beam of light is incident on a prism with an angle of incidence of 30°. If the re\fractive index of the prism is 1.5, calculate the angle of re\fraction.
A. 20°
B. 30°
C. 40°
D. 50°
Question 10
A radioactive sample of Uranium-238 undergoes \alpha decay. If the half-life of Uranium-238 is 4.5 billion years, what is the decay cons\tant (λ) in s^-1?
A. 1.54 x 10^-18 s^-1
B. 1.54 x 10^-17 s^-1
C. 1.54 x 10^-16 s^-1
D. 1.54 x 10^-15 s^-1
Question 11
A particle of mass 1 kg is moving in a circular path of radius 2 m with a speed of 4 m/s. If the particle is subject to a centripetal force of 10 N, calculate the angular velocity.
A. 0.5 rad/s
B. 1 rad/s
C. 2 rad/s
D. 5 rad/s
Question 12
A parallel plate capacitor has plates of area 0.1 m^2 and separation 0.01 m. If the dielectric cons\tant of the material between the plates is 3, calculate the capaci\tance.
A. 10^-9 F
B. 10^-8 F
C. 10^-7 F
D. 10^-6 F
Question 13
A block of mass 5 kg is attached to a horizontal spring with a force cons\tant of 20 N/m. If the block is displaced by 2 m from its equilibrium position and released from rest, what is the maximum speed of the block?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 14
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 12 V. If a dielectric material with a dielectric cons\tant of 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 15
A radioactive sample of Uranium-238 undergoes \alpha decay. If the initial mass of the sample is 100 g, and the mass of an \alpha particle is 4 u, calculate the mass of the daughter nucleus after 10 half-lives.
A. 0.001 g
B. 0.01 g
C. 0.1 g
D. 1 g

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