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POST UTME SKYLINE UNIVERSITY 2018 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 2018 Physics (Objective) questions designed to simulate the real exam environment.

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Question 1

A block of mass 2 kg is attached to a horizontal, massless spring with a spring cons\tant of 100 N/m. The block is displaced by 0.2 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the maximum speed of the block as it passes through the equilibrium position.

A. 0.5 m/s

Correct B. 1.0 m/s

C. 1.5 m/s

D. 2.0 m/s

Correct Answer: B

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Question 2

A 2.0 L sample of a gas at 300 K and 1.0 atm is heated to 400 K at cons\tant volume. What is the final pressure of the gas?

A. 1.5 atm

Correct B. 2.0 atm

C. 2.5 atm

D. 3.0 atm

Correct Answer: B

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Question 3

A 50 Hz AC voltage source is connected to a 100 Ω resistor. What is the peak value of the current flowing through the resistor?

A. 0.5 A

Correct B. 1.0 A

C. 1.5 A

D. 2.0 A

Correct Answer: B

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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. What is the maximum height reached by the projectile?

A. 10 m

B. 15 m

Correct C. 20 m

D. 25 m

Correct Answer: C

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Question 5

A 10 Ω resistor is connected in series with a 20 μF capacitor and a 50 Hz AC voltage source. What is the impedance of the circuit?

A. 10 Ω

B. 15 Ω

Correct C. 20 Ω

D. 25 Ω

Correct Answer: C

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Question 6

A light ray passes through a prism of re\fractive index 1.5, and is incident at an angle of 30° to the normal. If the angle of deviation is 60°, what is the angle of emergence?

Correct A. 45°

B. 30°

C. 60°

D. 75°

Correct Answer: A

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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 centripetal acceleration?

A. 10 m/s²

Correct B. 20 m/s²

C. 30 m/s²

D. 40 m/s²

Correct Answer: B

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Question 8

A circuit consists of a 12 Ω resistor, a 20 mH inductor, and a 50 μF capacitor connected in series. If the frequency of the alternating current is 50 Hz, what is the impedance of the circuit?

A. 15 Ω

B. 20 Ω

Correct C. 25 Ω

D. 30 Ω

Correct Answer: C

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Question 9

A block of mass 5 kg is placed on a horizontal, frictionless surface. A horizontal force of 10 N is applied to the block, cau\sing it to accelerate at 2 m/s². What is the normal force exerted by the surface on the block?

A. 20 N

Correct B. 25 N

C. 30 N

D. 35 N

Correct Answer: B

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Question 10

A \tank is filled with water to a height of 10 m. What is the pressure at the bottom of the \tank?

A. 100 kPa

B. 200 kPa

C. 300 kPa

Correct D. 400 kPa

Correct Answer: D

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Question 11

A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle experiences a centripetal acceleration of 4 m/s^2, what is its angular velocity?

A. 2 rad/s

B. 4 rad/s

Correct C. 6 rad/s

D. 8 rad/s

Correct Answer: C

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Question 12

A radioactive sample has a half-life of 10 years. If the initial activity is 100 Bq, what is the activity after 20 years?

A. 12.5 Bq

Correct B. 25 Bq

C. 50 Bq

D. 100 Bq

Correct Answer: B

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Question 13

A heat engine operates between a high-temperature reservoir at 500 K and a low-temperature reservoir at 300 K. If the engine has an efficiency of 30%, what is the temperature of the high-temperature reservoir?

A. 400 K

B. 500 K

Correct C. 600 K

D. 700 K

Correct Answer: C

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Question 14

A particle of mass 1 kg is moving in a straight line with an initial velocity of 5 m/s. If it experiences a cons\tant acceleration of 2 m/s^2, what is its velocity after 3 s?

A. 7 m/s

B. 9 m/s

Correct C. 11 m/s

D. 13 m/s

Correct Answer: C

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Question 15

A photon has an energy of 2 eV. If it is incident on a metal surface with a work function of 1 eV, what is the maximum kinetic energy of the emitted electron?

A. 0.5 eV

B. 1 eV

Correct C. 1.5 eV

D. 2 eV

Correct Answer: C

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Question 16

A particle of mass 2 kg is moving in a circular path with a cons\tant speed of 4 m/s. If the radius of the path is 3 m, calculate the magnitude of the centripetal acceleration.

A. 2.67 m/s^2

Correct B. 3.33 m/s^2

C. 4 m/s^2

D. 5 m/s^2

Correct Answer: B

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Question 17

A 5 kg block is attached to a horizontal, massless spring with a force cons\tant of 200 N/m. If the block is displaced by 0.2 m from its equilibrium position and released from rest, calculate the maximum speed of the block.

A. 0.5 m/s

B. 1 m/s

Correct C. 1.5 m/s

D. 2 m/s

Correct Answer: C

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Question 18

A parallel plate capacitor consists of two plates, each of area 0.1 m^2, separated by a dis\tance of 0.01 m. If the capaci\tance is 10 nF, calculate the charge on each plate when a potential difference of 5 V is applied across the capacitor.

A. 0.05 C

Correct B. 0.1 C

C. 0.15 C

D. 0.2 C

Correct Answer: B

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Question 19

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

A. 0.25 A

Correct B. 0.5 A

C. 0.75 A

D. 1 A

Correct Answer: B

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Question 20

A 5 kg block is moving in a straight line with a cons\tant acceleration of 2 m/s^2. If the initial velocity is 4 m/s, calculate the velocity after 3 seconds.

A. 6 m/s

B. 7 m/s

Correct C. 8 m/s

D. 9 m/s

Correct Answer: C

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Question 21

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 force of 12 N, what is the magnitude of the force?

A. 10 N

Correct B. 12 N

C. 15 N

D. 20 N

Correct Answer: B

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Question 22

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, what is the acceleration of the body?

A. 2 m/s^2

B. 4 m/s^2

C. 6 m/s^2

Correct D. 8 m/s^2

Correct Answer: D

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Question 23

A heat engine operates between the temperatures of 300 K and 400 K. If it produces 100 J of work, what is the efficiency of the engine?

A. 0.25

Correct B. 0.30

C. 0.35

D. 0.40

Correct Answer: B

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Question 24

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 A

Correct B. 2 A

C. 3 A

D. 4 A

Correct Answer: B

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Question 25

A beam of light passes from air into a glass 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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