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POST UTME RSU 2020 Physics | Objective

Are you preparing for POST UTME RSU 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 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. 4 m/s^2

B. 8 m/s^2

C. 12 m/s^2

Correct D. 16 m/s^2

Correct Answer: D

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Question 2

A capacitor consists of two parallel plates, each of area 0.1 m^2, separated by a dis\tance of 0.05 m. The dielectric cons\tant of the material between the plates is 3. The capaci\tance of the capacitor is

A. 1.5 x 10^-10 F

B. 3 x 10^-10 F

Correct C. 4.5 x 10^-10 F

D. 6 x 10^-10 F

Correct Answer: C

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Question 3

A body of mass 5 kg is moving with a velocity of 10 m/s. 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 4

A heat engine operates between the temperatures 300 K and 400 K. The efficiency of the engine is

A. 0.2

B. 0.3

Correct C. 0.4

D. 0.5

Correct Answer: C

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Question 5

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

A. 200 J

B. 400 J

Correct C. 600 J

D. 800 J

Correct Answer: C

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Question 6

A 2.5 mH inductor is connected in series with a 3.2 kΩ resistor and a 10 V battery. If the initial current is 0 A, find the current at t = 5 s.

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 7

A point charge of 5 μC is placed at the origin of a coordinate system. Find the electric potential at a point 2 m away from the charge.

Correct A. 100 V

B. 200 V

C. 300 V

D. 400 V

Correct Answer: A

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Question 8

A 10 Ω resistor is connected in parallel with a 20 Ω resistor. If a 12 V battery is connected across the combination, find the current through the 10 Ω resistor.

A. 0.6 A

B. 0.8 A

Correct C. 1.0 A

D. 1.2 A

Correct Answer: C

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Question 9

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 from rest, find the maximum speed of the block.

A. 2 m/s

Correct B. 4 m/s

C. 6 m/s

D. 8 m/s

Correct Answer: B

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Question 10

A 10 μF capacitor is connected in series with a 20 Ω resistor and a 12 V battery. If the initial charge on the capacitor is 0 C, find the charge on the capacitor at t = 5 s.

A. 0.2 C

B. 0.4 C

Correct C. 0.6 C

D. 0.8 C

Correct Answer: C

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Question 11

A 2.0 mH inductor is connected in series with a 3.0 μF capacitor across a 12 V DC source. If the circuit is initially uncharged, calculate the time taken for the charge on the capacitor to reach 90% of its maximum value.

A. 0.1 s

B. 0.2 s

Correct C. 0.3 s

D. 0.4 s

Correct Answer: C

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Question 12

A particle of mass 0.5 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.2 m from its equilibrium position and released from rest, calculate the maximum speed of the particle.

A. 0.5 m/s

B. 1.0 m/s

Correct C. 1.5 m/s

D. 2.0 m/s

Correct Answer: C

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Question 13

A 10 μF capacitor is connected in parallel with a 20 μF capacitor across a 12 V DC source. Calculate the equivalent capaci\tance of the circuit.

A. 10 μF

B. 20 μF

Correct C. 30 μF

D. 40 μF

Correct Answer: C

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Question 14

A 5.0 mH inductor is connected in series with a 10 Ω resistor across a 12 V DC source. If the current in the circuit is 2.0 A, calculate the voltage drop across the inductor.

A. 10 V

Correct B. 20 V

C. 30 V

D. 40 V

Correct Answer: B

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Question 15

A 10 μF capacitor is connected in series with a 20 Ω resistor across a 12 V DC source. If the time cons\tant of the circuit is 0.5 s, calculate the charge on the capacitor after 1.0 s.

A. 0.5 C

Correct B. 1.0 C

C. 1.5 C

D. 2.0 C

Correct Answer: B

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Question 16

A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 8 x 10^-6 F, what is the value of the dielectric cons\tant?

A. 1.25

B. 1.5

Correct C. 2.0

D. 2.5

Correct Answer: C

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Question 17

A wave has a frequency of 50 Hz and a wavelength of 10 m. What is the speed of the wave?

A. 250 m/s

Correct B. 500 m/s

C. 750 m/s

D. 1000 m/s

Correct Answer: B

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Question 18

A particle of mass 0.5 kg is moving in a circular path of radius 0.2 m with a speed of 5 m/s. What is the centripetal force acting on the particle?

A. 0.5 N

Correct B. 1.0 N

C. 1.5 N

D. 2.0 N

Correct Answer: B

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Question 19

A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. What is the total resis\tance of the circuit?

A. 10 Ω

B. 12 Ω

Correct C. 14 Ω

D. 16 Ω

Correct Answer: C

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Question 20

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

A. 10°

Correct B. 20°

C. 30°

D. 40°

Correct Answer: B

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Question 21

A parallel plate capacitor has a capaci\tance of 2 μF. If a potential difference of 10 V is applied across the plates, what is the magnitude of the displacement current?

Correct A. 0.02 A

B. 0.02 μA

C. 0.2 A

D. 0.2 μA

Correct Answer: A

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Question 22

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. 0.5 m/s^2

B. 1 m/s^2

Correct C. 2 m/s^2

D. 4 m/s^2

Correct Answer: C

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Question 23

A wave function is given by ψ(x) = Ae^\( -αx^2 \). What is the probability density of the wave function?

Correct A. A^2 e^{-2αx^2}

B. A^2 e^{2αx^2}

C. A^2 e^{-αx^2}

D. A^2 e^{αx^2}

Correct Answer: A

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Question 24

A circuit consists of a 12 V battery, a 4 Ω resistor, and a 2 H inductor in series. What is the inductive reac\tance of the circuit?

A. 10 Ω

Correct B. 20 Ω

C. 30 Ω

D. 40 Ω

Correct Answer: B

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Question 25

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. 50 Bq

B. 25 Bq

C. 12.5 Bq

Correct D. 6.25 Bq

Correct Answer: D

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