POST UTME BELLS UNIVERSITY 2020 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. If a 6 V battery is connected across the circuit, what is the current flowing through the 10 Ω resistor?
A. 0.2 A
B. 0.4 A
C. 0.6 A
D. 0.8 A
Question 2
A 50 Hz AC voltage is applied across a resistor of 10 ohms. What is the rms value of the current flowing through the resistor?
A. 2 A
B. 5 A
C. 10 A
D. 20 A
Question 3
A wave has a frequency of 50 Hz and a wavelength of 0.2 m. If the wave is traveling in the positive x-direction, what is the direction of the wave's velocity?
A. Positive x-direction
B. Negative x-direction
C. Positive y-direction
D. Negative y-direction
Question 4
A particle moves in a circular path with a cons\tant speed of 5 m/s. If the radius of the circle is 2 m, what is the magnitude of the centripetal acceleration?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 5
A circuit consists of a resistor of 10 ohms and an inductor of 5 henries in series. If the circuit is driven by a voltage source of 20 volts, what is the impedance of the circuit?
A. 10 ohms
B. 12 ohms
C. 14 ohms
D. 16 ohms
Question 6
A radioactive sample decays at a rate of 10% per hour. If the initial activity is 100 Bq, calculate the activity after 2 hours.
A. 20 Bq
B. 40 Bq
C. 60 Bq
D. 80 Bq
Question 7
A 2 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. If the block is displaced by 0.1 m from its equilibrium position and released from rest, what is the maximum speed of the block?
A. 0.5 m/s
B. 1.0 m/s
C. 1.5 m/s
D. 2.0 m/s
Question 8
A gas is heated from 300 K to 400 K at cons\tant volume. If the initial pressure is 1.2 atm, what is the final pressure?
A. 1.5 atm
B. 1.8 atm
C. 2.0 atm
D. 2.2 atm
Question 9
A 100 g sample of water is heated from 20°C to 80°C. If the specific heat capacity of water is 4.184 J/g°C, what is the energy transferred?
A. 4184 J
B. 41840 J
C. 418400 J
D. 4184000 J
Question 10
A heat engine operates between two temperatures, 300 K and 400 K. If the engine produces 100 J of work per cycle, what is the efficiency of the engine?
A. 0.25
B. 0.3
C. 0.35
D. 0.4
Question 11
A block of mass 5 kg is attached to a horizontal spring with a force cons\tant of 200 N/m. If the block is displaced by 0.2 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 12
A block of mass 5 kg is attached to a horizontal, massless spring with a force cons\tant of 200 N/m. If the block is displaced by 0.1 m from its equilibrium position and released from rest, what is the maximum speed of the block?
A. 0.5 m/s
B. 1.0 m/s
C. 1.5 m/s
D. 2.0 m/s
Question 13
A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. If the projectile lands 10 m away from the launch point, what is the maximum height reached by the projectile?
A. 5 m
B. 10 m
C. 15 m
D. 20 m
Question 14
A gas at 300 K and 1 atm expands to 2 atm against a cons\tant external pressure. Calculate the work done by the gas.
A. 100 J
B. 200 J
C. 300 J
D. 400 J
Question 15
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, what is the magnitude of the force acting on the particle?
A. 8 N
B. 10 N
C. 12 N
D. 16 N

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