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POST UTME SKYLINE UNIVERSITY 2017 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 2017 Physics (Objective) questions designed to simulate the real exam environment.

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Question 1

A gas is enclosed in a container of volume 2.5 liters at a temperature of 300 K. If the temperature is increased to 400 K, what is the new volume of the gas, assuming ideal gas behavior?

A. 3.125 liters

Correct B. 4.0 liters

C. 5.0 liters

D. 6.25 liters

Correct Answer: B

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Question 2

A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 20 V is applied across the plates, what is the charge stored on the capacitor?

A. 200 μC

Correct B. 400 μC

C. 600 μC

D. 800 μC

Correct Answer: B

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Question 3

A ray of light passes from air into a glass block at an angle of incidence of 30°. If the re\fractive index of the glass is 1.5, what is the angle of re\fraction?

A. 20°

Correct B. 25°

C. 30°

D. 35°

Correct Answer: B

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Question 4

A thermodynamic system undergoes a process from state A to state B. If the initial temperature is 300 K and the final temperature is 400 K, and the change in entropy is 10 J/K, what is the heat absorbed by the system?

A. 1000 J

B. 2000 J

C. 3000 J

Correct D. 4000 J

Correct Answer: D

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Question 5

A convex lens has a focal length of 20 cm. If an object is placed 30 cm in front of the lens, where will the image be formed?

A. 10 cm

Correct B. 20 cm

C. 30 cm

D. 40 cm

Correct Answer: B

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Question 6

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. 25°

C. 30°

D. 35°

Correct Answer: B

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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. What is the magnitude of the force acting on the particle?

A. 10 N

B. 20 N

Correct C. 30 N

D. 40 N

Correct Answer: C

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Question 8

A magnetic field of strength 2 T is applied to a current-carrying wire of length 5 m. If the current in the wire is 3 A, what is the magnitude of the force acting on the wire?

A. 10 N

B. 20 N

Correct C. 30 N

D. 40 N

Correct Answer: C

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Question 9

A block of mass 5 kg is placed on a horizontal surface. If a force of 20 N is applied to the block, what is the acceleration of the block?

A. 2 m/s^2

Correct B. 4 m/s^2

C. 6 m/s^2

D. 8 m/s^2

Correct Answer: B

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Question 10

A spring of spring cons\tant 100 N/m is stretched by 2 m. What is the potential energy stored in the spring?

A. 100 J

B. 200 J

Correct C. 300 J

D. 400 J

Correct Answer: C

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Question 11

A 1000 Hz AC voltage source is connected to a 50 Ω resistor. If the maximum voltage is 100 V, calculate the root mean square (RMS) value of the current flowing through the resistor.

A. 2 A

Correct B. 4 A

C. 5 A

D. 10 A

Correct Answer: B

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Question 12

A 10 kg block is placed on a frictionless surface. A horizontal force of 20 N is applied to the block. If the block starts from rest, calculate the work done by the force in the first 2 seconds.

Correct A. 40 J

B. 60 J

C. 80 J

D. 100 J

Correct Answer: A

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Question 13

A capacitor of capaci\tance 100 μF is connected to a 12 V DC source. Calculate the energy stored in the capacitor.

Correct A. 0.72 J

B. 1.44 J

C. 2.16 J

D. 3.36 J

Correct Answer: A

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Question 14

A 200 g block is heated from 20°C to 80°C. If the specific heat capacity of the block is 400 J/kg°C, calculate the energy transferred to the block.

A. 800 J

Correct B. 1200 J

C. 1600 J

D. 2000 J

Correct Answer: B

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Question 15

A 50 Ω resistor is connected to a 100 V AC source. If the power factor is 0.8, calculate the power consumed by the resistor.

A. 50 W

B. 60 W

C. 70 W

Correct D. 80 W

Correct Answer: D

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Question 16

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 centripetal acceleration of 2 m/s^2, what is the magnitude of the net force acting on the particle?

A. 8 N

Correct B. 12 N

C. 16 N

D. 20 N

Correct Answer: B

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Question 17

A block of mass 5 kg is placed on a frictionless surface and a horizontal force of 10 N is applied to it. If the block starts moving with an initial velocity of 2 m/s, what is the work done by the force?

A. -20 J

B. -10 J

C. 0 J

Correct D. 20 J

Correct Answer: D

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Question 18

A spring with a spring cons\tant of 100 N/m is stretched by 2 m. If the spring is then released from rest, what is the maximum velocity of the spring?

A. 2 m/s

B. 4 m/s

C. 6 m/s

Correct D. 8 m/s

Correct Answer: D

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Question 19

A \tank contains 1000 kg of water at a temperature of 20°C. If 200 J of heat energy is added to the water, what is the change in temperature of the water?

A. 0.1°C

B. 0.2°C

C. 0.3°C

Correct D. 0.4°C

Correct Answer: D

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Question 20

A body of mass 10 kg is moving in a circular path of radius 4 m with a cons\tant speed of 3 m/s. If the body is subjected to a centripetal acceleration of 1.5 m/s^2, what is the magnitude of the net force acting on the body?

A. 15 N

B. 20 N

C. 25 N

Correct D. 30 N

Correct Answer: D

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Question 21

A particle of mass $m$ is attached to a spring with spring cons\tant $k$. The particle is displaced from its equilibrium position by a dis\tance $x_0$ and released from rest. Assuming the motion is simple harmonic, find the angular frequency of the oscillations.

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 22

A gas is enclosed in a container of volume $V$ at a temperature $T$. The gas is heated to a higher temperature $T_2$, cau\sing the volume to increase to $V_2$. Assuming the gas obeys the ideal gas law, find the ratio of the final volume to the initial volume.

Correct A. \frac{T_2}{T_1}

B. \frac{T_1}{T_2}

C. \frac{P_2}{P_1}

D. \frac{P_1}{P_2}

Correct Answer: A

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Question 23

A magnetic field is produced by a current-carrying wire. The wire is oriented at an angle $\theta$ to the magnetic field. Find the component of the magnetic field perp\endicular to the wire.

Correct A. B \sin \theta

B. B \cos \theta

C. B \sin^2 \theta

D. B \cos^2 \theta

Correct Answer: A

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Question 24

A ray of light passes from air into a glass block at an angle of incidence $\theta_i$. The angle of re\fraction is $\theta_r$. Find the re\fractive index of the glass.

Correct A. \frac{\sin \theta_i}{\sin \theta_r}

B. \frac{\sin \theta_r}{\sin \theta_i}

C. \frac{\cos \theta_i}{\cos \theta_r}

D. \frac{\cos \theta_r}{\cos \theta_i}

Correct Answer: A

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Question 25

A sound wave has a frequency of $f$ and a wavelength of $\lambda$. Find the speed of the sound wave.

Correct A. f \lambda

B. \frac{f}{\lambda}

C. \frac{\lambda}{f}

D. \frac{1}{f \lambda}

Correct Answer: A

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