POST UTME GREENFIELD UNIVERSITY 2022 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 50 Hz AC generator produces an emf of 200 V. What is the maximum current drawn by a 100 Ω resistor connected across the generator?
A. 0.5 A
B. 1 A
C. 2 A
D. 5 A
Question 2
A radioactive sample decays from 100 g to 50 g in 10 years. If the decay cons\tant is 0.05 yr^-1, calculate the half-life of the sample.
A. 5 years
B. 10 years
C. 15 years
D. 20 years
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 force acting on the particle?
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 4
A particle of mass 1 kg is moving in a circular path with a radius of 0.5 m. If the particle has a speed of 5 m/s, what is the centripetal acceleration?
A. 5 m/s^2
B. 10 m/s^2
C. 15 m/s^2
D. 20 m/s^2
Question 5
A 10 V battery is connected in series with a 5 Ω resistor and a 2 Ω resistor. If the current in the circuit is 1 A, calculate the voltage drop across the 5 Ω resistor.
A. 3 V
B. 5 V
C. 7 V
D. 10 V
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 subject to a centripetal acceleration of 2 m/s^2, calculate the force acting on the particle.
A. 8 N
B. 10 N
C. 12 N
D. 15 N
Question 7
A 100 W light bulb is connected to a 220 V power source. What is the current drawn by the bulb?
A. 0.4 A
B. 0.5 A
C. 0.6 A
D. 0.7 A
Question 8
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the total resis\tance of the circuit?
A. 2 Ω
B. 4 Ω
C. 6 Ω
D. 8 Ω
Question 9
A 2 kg block is moving in a straight line with an initial velocity of 4 m/s. If the block experiences a cons\tant acceleration of 2 m/s^2, calculate the time it takes for the block to reach a velocity of 6 m/s.
A. 1 s
B. 2 s
C. 3 s
D. 4 s
Question 10
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 subject to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?
A. 12 m/s^2
B. 16 m/s^2
C. 20 m/s^2
D. 24 m/s^2
Question 11
A gas is confined to a cylinder of volume 2 m^3 at a temperature of 300 K. If the gas is heated to a temperature of 400 K, what is the new volume of the gas?
A. 2.5 m^3
B. 3 m^3
C. 3.5 m^3
D. 4 m^3
Question 12
A block of mass 5 kg is attached to a horizontal, massless spring with a force cons\tant of 200 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 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 13
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 14
A radioactive sample emits \alpha particles with a half-life of 5 minutes. If the initial activity is 100 Bq, what is the activity after 20 minutes?
A. 50 Bq
B. 25 Bq
C. 12.5 Bq
D. 6.25 Bq
Question 15
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. 30°
C. 45°
D. 60°

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