POST UTME OAU 2018 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A 2 kg block is moving in a circular path of radius 3 m with a cons\tant speed of 4 m/s. If the block 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 particle of mass $m$ is projected from the origin with an initial velocity $v_0$ at an angle $\theta$ to the horizontal. Find the time of flight.
A. \frac{2v_0\sin\theta}{g}
B. \frac{v_0\sin\theta}{g}
C. \frac{2v_0\cos\theta}{g}
D. \frac{v_0\cos\theta}{g}
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. Calculate the magnitude of the centripetal force acting on the particle.
A. 10 N
B. 20 N
C. 30 N
D. 40 N
Question 4
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 acceleration due to gravity is 9.8 m/s^2, what is the maximum height reached by the projectile?
A. 10 m
B. 15 m
C. 20 m
D. 25 m
Question 5
A current of 5 A flows through a wire of resis\tance 10 Ω. If the wire is connected to a power source of voltage 20 V, what is the power consumed by the wire?
A. 50 W
B. 100 W
C. 150 W
D. 200 W
Question 6
A block of mass 5 kg is attached to a horizontal spring with a force cons\tant of 200 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 7
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 uniform magnetic field of 2 T, what is the magnitude of the magnetic force acting on the particle?
A. 8 N
B. 10 N
C. 12 N
D. 16 N
Question 8
A body of mass 5 kg is moving with a velocity of 10 m/s. If the body is subjected to a force of 20 N, what is the acceleration of the body?
A. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 9
A projectile is launched from the origin with an initial velocity $v_0$ at an angle $\theta$ above the horizontal. If the projectile has a mass $m$ and the acceleration due to gravity is $g$, calculate the time of flight $T$.
A. \frac{2 v_0 \sin \theta}{g}
B. \frac{v_0 \sin \theta}{g}
C. \frac{2 v_0 \cos \theta}{g}
D. \frac{v_0 \cos \theta}{g}
Question 10
A parallel plate capacitor consists of two plates, each of area $A$ and separation $d$. The plates are connected to a battery of emf $V$. If the dielectric cons\tant of the material between the plates is $kappa$, calculate the capaci\tance $C$.
A. \frac{\kappa A}{d}
B. \frac{A}{\kappa d}
C. \frac{\kappa A}{V}
D. \frac{A}{V}
Question 11
A 2 kg block is moving in a straight line with a velocity of 5 m/s. If a force of 10 N is applied to the block, what is the acceleration of the block?
A. 0.5 m/s^2
B. 1 m/s^2
C. 2 m/s^2
D. 5 m/s^2
Question 12
A 100 V, 10 A current source is connected in parallel with a 20 Ω resistor and a 30 Ω resistor. What is the total current in the circuit?
A. 10 A
B. 15 A
C. 20 A
D. 25 A
Question 13
A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 5 V. What is the energy stored in the capacitor?
A. 0.25 J
B. 0.5 J
C. 1 J
D. 2 J
Question 14
A particle of mass $m$ is moving in a circular orbit of radius $r$ under the influence of a central force $F(r) = \frac{k}{r^2}$. If the particle has an initial velocity $v_0$ at $r = r_0$, calculate the total energy $E$ of the particle.
A. \frac{1}{2} m v_0^2 - \frac{k}{r_0}
B. \frac{1}{2} m v_0^2 + \frac{k}{r_0}
C. \frac{1}{2} m v_0^2 - \frac{k}{r}
D. \frac{1}{2} m v_0^2 + \frac{k}{r}
Question 15
A gas is confined to a container with a volume of 2.5 L. If the temperature of the gas is increased from 20°C to 50°C, and the pressure is increased from 1 atm to 2 atm, calculate the new volume of the gas.
A. 5 L
B. 10 L
C. 15 L
D. 20 L

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