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POST UTME UNILAG 2017 Physics | Objective

Are you preparing for POST UTME UNILAG 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.

Practice these randomly selected questions to test your readiness.

Question 1

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/s^2

Correct B. 12 m/s^2

C. 15 m/s^2

D. 20 m/s^2

Correct Answer: B

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Question 2

A 10 V battery is connected in series with a 5 Ω resistor and a 2 Ω resistor. What is the current flowing through the circuit?

A. 0.5 A

Correct B. 1 A

C. 1.5 A

D. 2 A

Correct Answer: B

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Question 3

A ray of light passes through a prism and is re\fracted. What is the angle of re\fraction?

A. 30°

B. 40°

Correct C. 50°

D. 60°

Correct Answer: C

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Question 4

A gas is heated from 20°C to 80°C at cons\tant volume. What is the change in internal energy?

Correct A. 100 J

B. 200 J

C. 300 J

D. 400 J

Correct Answer: A

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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. 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 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 experiences a centripetal acceleration of 2 m/s^2, what is the force exerted on the particle?

A. 8 N

B. 10 N

Correct C. 12 N

D. 16 N

Correct Answer: C

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Question 7

A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 20 V. If the plates are then separated by a dis\tance of 5 mm, what is the new capaci\tance?

A. 20 μF

Correct B. 30 μF

C. 40 μF

D. 50 μF

Correct Answer: B

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Question 8

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 9

A wave has a frequency of 100 Hz and a wavelength of 0.5 m. What is the speed of the wave?

A. 50 m/s

Correct B. 100 m/s

C. 150 m/s

D. 200 m/s

Correct Answer: B

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Question 10

A circuit consists of a 10 Ω resistor and a 20 Ω resistor connected in series. If a voltage of 20 V is applied across the circuit, what is the current flowing through the circuit?

A. 0.5 A

B. 1 A

Correct C. 2 A

D. 4 A

Correct Answer: C

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Question 11

A heat engine operates between two heat reservoirs at temperatures $T_1 = 500,K$ and $T_2 = 300,K$. If the engine produces 500,J of work in one cycle, what is its efficiency?

A. 0.4

Correct B. 0.6

C. 0.8

D. 0.9

Correct Answer: B

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Question 12

A particle of mass $m$ moves in a circular path of radius $R$ with a cons\tant speed $v$. If the particle experiences a centripetal acceleration of $a_c = \frac{v^2}{R}$, what is the force acting on the particle?

Correct A. F = \frac{mv^2}{R}

B. F = \frac{mv^2}{R^2}

C. F = \frac{mv^2}{R^3}

D. F = \frac{mv^2}{R^4}

Correct Answer: A

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Question 13

A convex lens of focal length $f = 20,cm$ forms an image of an object at a dis\tance $u = 30,cm$ from the lens. What is the magnification of the image?

Correct A. M = -0.5

B. M = -1

C. M = -1.5

D. M = -2

Correct Answer: A

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Question 14

A sound wave of frequency $f = 200,Hz$ and amplitude $A = 0.5,m$ travels through a medium with speed $v = 340,m/s$. What is the intensity of the sound wave?

A. I = 10^{-3},W/m^2

B. I = 10^{-2},W/m^2

Correct C. I = 10^{-1},W/m^2

D. I = 10^{0},W/m^2

Correct Answer: C

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Question 15

A magnetic field of strength $B = 0.5,T$ is applied to a current-carrying wire of length $L = 1,m$ and resis\tance $R = 10,\Omega$. What is the force experienced by the wire?

A. F = 5,N

Correct B. F = 10,N

C. F = 15,N

D. F = 20,N

Correct Answer: B

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Question 16

A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. The particle is displaced by 0.5 m from its equilibrium position and released from rest. Assuming the motion is simple harmonic, calculate the total energy of the particle at time t = 0.

A. 10 J

B. 20 J

Correct C. 25 J

D. 30 J

Correct Answer: C

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Question 17

A circuit consists of a 12 V battery, a 4 Ω resistor, and an inductor with an induc\tance of 0.5 H. The circuit is closed at time t = 0. Assuming the current is zero at t = 0, calculate the current in the circuit at time t = 2 s.

A. 0.5 A

Correct B. 1 A

C. 2 A

D. 3 A

Correct Answer: B

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Question 18

A beam of light passes through a prism and is re\fracted. The angle of incidence is 30°, and the angle of re\fraction is 20°. Calculate the angle of deviation.

A. 10°

B. 15°

Correct C. 20°

D. 25°

Correct Answer: C

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Question 19

A radioactive sample decays at a rate of 0.5% per hour. If the initial amount of the sample is 100 g, calculate the amount of the sample remaining after 5 hours.

A. 50 g

Correct B. 75 g

C. 90 g

D. 95 g

Correct Answer: B

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Question 20

A particle of mass 1 kg is moving in a circular path with a radius of 2 m. The particle is moving at a speed of 4 m/s. Calculate the centripetal 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 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. 8 N

Correct B. 12 N

C. 16 N

D. 20 N

Correct Answer: B

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Question 22

A radioactive sample has a half-life of 5 years. If the initial activity is 1000 Bq, what is the activity after 10 years?

Correct A. 250 Bq

B. 500 Bq

C. 750 Bq

D. 1000 Bq

Correct Answer: A

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Question 23

A 10 V battery is connected to a 2 Ω resistor in series with a 4 Ω resistor. What is the current flowing through the 2 Ω resistor?

A. 0.5 A

Correct B. 1 A

C. 1.5 A

D. 2 A

Correct Answer: B

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Question 24

A block of mass 5 kg is susp\ended from a spring with a spring cons\tant of 100 N/m. If the block is displaced by 2 m from its equilibrium position, 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 25

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 seconds?

A. 7 m/s

B. 8 m/s

Correct C. 9 m/s

D. 10 m/s

Correct Answer: C

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