POST UTME OAU 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 100 W light bulb is connected to a 120 V power source. Determine the current flowing through the bulb.
A. 0.50 A
B. 1.00 A
C. 2.00 A
D. 4.00 A
Question 2
A wave has a frequency of 50 Hz and a wavelength of 2.0 m. Determine the speed of the wave.
A. 100 m/s
B. 200 m/s
C. 500 m/s
D. 1000 m/s
Question 3
A 10 V battery is connected in series with a 5 Ω resistor and a 2 Ω resistor. Calculate the current flowing through the circuit.
A. 0.5 A
B. 1 A
C. 2 A
D. 4 A
Question 4
A body of mass 2 kg is moving in a circular path of radius 3 m with a cons\tant speed of 4 m/s. Calculate the force acting on the body.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 5
A projectile is launched from the origin with an initial velocity $v_0$ at an angle $\theta$ above the horizontal. What is the maximum height reached by the projectile?
A. \( \frac{v_0^2 \sin^2 \theta}{2g} \)
B. \( \frac{v_0^2 \cos^2 \theta}{2g} \)
C. \( \frac{v_0^2 \sin \theta}{2g} \)
D. \( \frac{v_0^2 \cos \theta}{2g} \)
Question 6
A light ray passes through a prism of angle 60 degrees and emerges parallel to the incident ray. What is the angle of deviation?
A. 30 degrees
B. 45 degrees
C. 60 degrees
D. 90 degrees
Question 7
A magnet is placed near a coil of wire, cau\sing a current to flow in the coil. If the magnetic field strength is 0.5 T and the coil has a resis\tance of 10 Ω, calculate the induced emf in the coil.
A. 0.5 V
B. 1 V
C. 2 V
D. 5 V
Question 8
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.
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 9
A parallel plate capacitor consists of two plates of area $A$ separated by a dis\tance $d$. If the capaci\tance of the capacitor is given by $C = \frac{\epsilon_0 A}{d}$, what is the capaci\tance of a capacitor with plates of area $4A$ and separation $2d$?
A. \frac{\epsilon_0 A}{d}
B. \frac{2\epsilon_0 A}{d}
C. \frac{\epsilon_0 4A}{2d}
D. \frac{\epsilon_0 4A}{d}
Question 10
A 2.5 mH inductor is connected in series with a 10 Ω resistor and a 20 V AC source. If the frequency of the source is 50 Hz, calculate the impedance of the circuit.
A. 15 Ω
B. 20 Ω
C. 25 Ω
D. 30 Ω
Question 11
A block of mass 2 kg is susp\ended from a spring with spring cons\tant 100 N/m. If the block is displaced by 0.2 m from its equilibrium position and released, calculate the time taken for the block to reach its maximum speed.
A. 0.1 s
B. 0.2 s
C. 0.5 s
D. 1 s
Question 12
A \tank is filled with water to a height of 5 m. If a small hole of area 0.01 m^2 is made at the bottom of the \tank, find the rate at which the water level falls.
A. 0.1 m/s
B. 0.2 m/s
C. 0.3 m/s
D. 0.4 m/s
Question 13
A wave has a frequency of 50 Hz and a wavelength of 0.1 m. What is the speed of the wave?
A. 5 m/s
B. 10 m/s
C. 15 m/s
D. 20 m/s
Question 14
A block of wood is floating in a \tank of water. If the block has a mass of 2 kg and the density of water is 1000 kg/m^3, calculate the volume of the block.
A. 0.002 m^3
B. 0.004 m^3
C. 0.006 m^3
D. 0.008 m^3
Question 15
A block of mass 5 kg is placed on a frictionless surface and a force of 20 N is applied to it. What is the acceleration of the block?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2

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