POST UTME UNIBEN 2019 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 force?
A. 10 N
B. 12 N
C. 15 N
D. 20 N
Question 2
A magnet is placed near a coil of wire. If the coil has a resis\tance of 10 Ω and an induc\tance of 5 H, what is the current flowing through the coil?
A. 2 A
B. 3 A
C. 4 A
D. 5 A
Question 3
A magnetic field $B$ is directed perp\endicular to the plane of a circular loop of wire with radius $r$. If a current $I$ flows through the loop, the magnetic moment of the loop is given by $\mu = I\pi r^2$. Which of the following expressions for the torque $\tau$ experienced by the loop is correct?
A. \( \tau = \mu B \sin{\theta} \)
B. \( \tau = \mu B \cos{\theta} \)
C. \( \tau = \mu B \tan{\theta} \)
D. \( \tau = \mu B \cot{\theta} \)
Question 4
A convex lens of focal length 20 cm is used to form an image of an object placed 30 cm away. What is the magnification of the image?
A. 0.5
B. 1.0
C. 1.5
D. 2.0
Question 5
A uniform magnetic field of 2 T is applied to a coil of wire with 100 turns. If the coil is rotated by 90 degrees in 0.1 seconds, what is the induced emf in the coil?
A. 0.5 V
B. 1 V
C. 2 V
D. 5 V
Question 6
A body of mass 5 kg is moving with a velocity of 10 m/s. If it is subjected to a force of 20 N, calculate the acceleration produced.
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 7
A block of mass 5.0 kg is moving with a velocity of 2.0 m/s. If a force of 10 N is applied to the block for 3.0 s, what is the final velocity of the block?
A. 4.0 m/s
B. 5.0 m/s
C. 6.0 m/s
D. 7.0 m/s
Question 8
A 5 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. 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 9
A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the current flowing through the circuit?
A. 1.5 A
B. 2 A
C. 2.5 A
D. 3 A
Question 10
A circuit consists of a 12 µF resistor, a 15 µF resistor, and a 20 µF resistor connected in series. If a voltage of 18 V is applied across the circuit, what is the current in the circuit?
A. 0.5 A
B. 0.6 A
C. 0.7 A
D. 0.8 A
Question 11
A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle is subject to a centripetal force of 10 N, what is its angular velocity?
A. 1 rad/s
B. 2 rad/s
C. 3 rad/s
D. 4 rad/s
Question 12
A wave has a frequency of 50 Hz and a wavelength of 0.2 m. What is the speed of the wave?
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s
Question 13
A radioactive sample of Δₗ emits Δₗα particles with a half-life of 5.27 years. If the initial activity is 1.0 µCi, what is the activity after 10.54 years?
A. 0.25 µCi
B. 0.125 µCi
C. 0.0625 µCi
D. 0.03125 µCi
Question 14
A gas is confined to a container with a volume of 2.5 L at a temperature of 300 K. If the temperature is increased to 400 K, what is the new volume of the gas?
A. 3.125 L
B. 3.75 L
C. 4.5 L
D. 5 L
Question 15
A heat engine operates between two temperatures of 500 K and 300 K. If the engine has an efficiency of 30%, what is its coefficient of performance?
A. 0.5
B. 1
C. 2
D. 3

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