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POST UTME SKYLINE UNIVERSITY 2020 Physics | Objective

Are you preparing for POST UTME SKYLINE UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Physics (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

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, what is the impedance of the circuit?

A. 10 Ω

B. 20 Ω

Correct C. 30 Ω

D. 40 Ω

Correct Answer: C

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Question 2

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°

Correct B. 30°

C. 40°

D. 50°

Correct Answer: B

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Question 3

A 100 W bulb is connected to a 230 V AC source. If the power factor is 0.8, what is the current drawn by the bulb?

A. 0.5 A

B. 0.6 A

C. 0.7 A

Correct D. 0.8 A

Correct Answer: D

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Question 4

A sound wave has a frequency of 200 Hz and a wavelength of 1.5 m. What is the speed of the sound wave?

A. 300 m/s

B. 400 m/s

Correct C. 500 m/s

D. 600 m/s

Correct Answer: C

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Question 5

A 5 kg block is attached to a horizontal spring with a force cons\tant of 100 N/m. If the block is displaced by 2 m from its equilibrium position and released, what is the maximum speed of the block?

A. 2 m/s

B. 4 m/s

Correct C. 6 m/s

D. 8 m/s

Correct Answer: C

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Question 6

A 2 kg block of metal is heated from 20°C to 80°C. If the specific heat capacity of the metal is 0.4 kJ/kg°C, calculate the heat energy transferred to the block.

A. 160 J

B. 320 J

Correct C. 640 J

D. 1280 J

Correct Answer: C

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Question 7

A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. If a 12 V battery is connected across the circuit, calculate the current flowing through the 10 Ω resistor.

A. 0.4 A

B. 0.8 A

Correct C. 1.2 A

D. 1.6 A

Correct Answer: C

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Question 8

A particle of mass 0.5 kg is moving in a circular path with a radius of 2 m. If the particle has a velocity of 4 m/s, calculate the centripetal force acting on the particle.

A. 8 N

B. 16 N

Correct C. 32 N

D. 64 N

Correct Answer: C

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Question 9

A simple harmonic motion has a maximum displacement of 2 m and a frequency of 3 Hz. If the amplitude is 1 m, calculate the angular frequency.

A. 6 rad/s

B. 12 rad/s

Correct C. 18 rad/s

D. 24 rad/s

Correct Answer: C

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Question 10

A 5 kg block is moving with a velocity of 2 m/s. If a force of 10 N is applied to the block, calculate the acceleration of the block.

A. 0.2 m/s^2

B. 0.4 m/s^2

Correct C. 0.6 m/s^2

D. 0.8 m/s^2

Correct Answer: C

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Question 11

A solid sphere of radius R is floating in a liquid of density ρ. The sphere is made of a material of density σ. If the sphere is displaced by a dis\tance x from its equilibrium position, the force of buoyancy on the sphere is given by F = $ 4/3 $πR^3$ ρ - σ $g. What is the potential energy of the sphere in the displaced position?

A. 0

Correct B. \frac{1}{2}$ 4/3 $πR^3$ ρ - σ $gx

C. \frac{1}{2}$ 4/3 $πR^3$ ρ - σ $gx^2

D. \frac{1}{2}$ 4/3 $πR^3$ ρ - σ $gx^3

Correct Answer: B

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Question 12

A light ray passes through a prism of angle A and is re\fracted at an angle θ. The angle of deviation is given by δ = A + θ - α, where α is the angle of incidence. If the angle of incidence is 30° and the angle of re\fraction is 40°, what is the angle of deviation?

A. 20°

B. 30°

Correct C. 40°

D. 50°

Correct Answer: C

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Question 13

A charged particle of mass m and charge q is moving in a uniform magnetic field of strength B. The particle is moving with a velocity v perp\endicular to the magnetic field. What is the force acting on the particle?

A. qBv

Correct B. qvB

C. qB^2v

D. qv^2B

Correct Answer: B

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Question 14

A capacitor of capaci\tance C is charged to a potential difference V. The capacitor is then connected to a resistor of resis\tance R. What is the time cons\tant of the circuit?

A. CR

Correct B. RC

C. C/R

D. R/C

Correct Answer: B

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Question 15

A light ray passes through a convex lens of focal length f. The object dis\tance is given by u. What is the image dis\tance?

A. f

B. u

Correct C. f + u

D. f - u

Correct Answer: C

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Question 16

A particle of mass $m$ is attached to a spring with spring cons\tant $k$. The particle is displaced by a dis\tance $x$ from its equilibrium position and released from rest. Assuming the motion is simple harmonic, find the angular frequency of the particle's motion.

Correct A. \sqrt{\frac{k}{m}}

B. \frac{k}{m}

C. \frac{m}{k}

D. \frac{1}{\sqrt{mk}}

Correct Answer: A

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Question 17

A circuit consists of a resistor $R$, an inductor $L$, and a capacitor $C$ connected in series. The circuit is driven by an alternating voltage source with a frequency of $f$. Assuming the circuit is in resonance, find the impedance of the circuit.

Correct A. \sqrt{R^2 + $ \omega L - \frac{1}{\omega C} $^2}

B. R + \omega L - \frac{1}{\omega C}

C. \\omega L - \\frac{1}{\\omega C}

D. R - \omega L + \frac{1}{\omega C}

Correct Answer: A

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Question 18

A vector $\vec{A}$ has a magnitude of $5$ units and is directed at an angle of $30^\circ$ above the positive x-axis. Find the x-component of $\vec{A}$.

Correct A. 5 \\cos 30^\\circ

B. 5 \\sin 30^\\circ

C. 5 \\cos 60^\\circ

D. 5 \\sin 60^\\circ

Correct Answer: A

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Question 19

A block of mass $m$ is placed on a frictionless surface and a horizontal force $F$ is applied to it. If the block is displaced by a dis\tance $x$ from its equilibrium position and released, find the time period of the resulting simple harmonic motion.

Correct A. 2\pi \sqrt{\frac{m}{k}}

B. \frac{m}{k}

C. \frac{k}{m}

D. \frac{1}{\sqrt{mk}}

Correct Answer: A

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Question 20

A liquid of density $\rho$ is contained in a \tank of height $h$ and base area $A$. Find the pressure at the bottom of the \tank.

Correct A. \rho gh

B. \frac{\rho gh}{A}

C. \frac{\rho h}{A}

D. \frac{\rho g}{A}

Correct Answer: A

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Question 21

A coil of wire has a resis\tance of $R$ and an induc\tance of $L$. If the coil is connected to a battery of emf $\mathcal{E}$, find the current in the coil after a time $t$.

Correct A. \frac{\mathcal{E}}{R} $ 1 - e^{-\frac{Rt}{L}} $

B. \frac{\mathcal{E}}{R} e^{-\frac{Rt}{L}}

C. \frac{\mathcal{E}}{R} $ 1 + e^{-\frac{Rt}{L}} $

D. \frac{\mathcal{E}}{R} $ 1 - e^{\frac{Rt}{L}} $

Correct Answer: A

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Question 22

A magnetic field of strength $B$ is directed perp\endicular to a wire of length $L$ and carrying a current $I$. Find the force on the wire.

A. BIL

B. \frac{BIL}{L}

C. \frac{BIL}{I}

D. \frac{BIL}{B}

Correct Answer: VIEW ANSWER

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