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POST UTME BELLS UNIVERSITY 2020 Physics | Objective

Are you preparing for POST UTME BELLS 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 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. If a 6 V battery is connected across the circuit, what is the current flowing through the 10 Ω resistor?

Correct A. 0.2 A

B. 0.4 A

C. 0.6 A

D. 0.8 A

Correct Answer: A

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Question 2

A gas at 300 K expands from 1 L to 2 L against a cons\tant external pressure of 1 atm. What is the work done by the gas?

A. -1.0 J

B. -0.5 J

Correct C. 0.0 J

D. 1.0 J

Correct Answer: C

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Question 3

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. 25 Bq

Correct B. 50 Bq

C. 75 Bq

D. 100 Bq

Correct Answer: B

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Question 4

A 2 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. If the block is displaced by 0.1 m from its equilibrium position and released from rest, what is the maximum speed of the block?

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 5

A 5 μF capacitor is connected in series with a 10 μF capacitor and a 20 μF capacitor. If a 12 V battery is connected across the circuit, what is the charge on the 5 μF capacitor?

A. 0.06 C

Correct B. 0.12 C

C. 0.18 C

D. 0.24 C

Correct Answer: B

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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 is subject to a centripetal force of 12 N, what is the magnitude of the acceleration of the particle?

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 7

A wave has a frequency of 50 Hz and a wavelength of 0.2 m. If the wave is traveling in the positive x-direction, what is the direction of the wave's velocity?

Correct A. Positive x-direction

B. Negative x-direction

C. Positive y-direction

D. Negative y-direction

Correct Answer: A

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Question 8

A block of mass 5 kg is attached to a horizontal, massless spring with a force cons\tant of 200 N/m. If the block is displaced by 0.1 m from its equilibrium position and released from rest, what is the maximum speed of the block?

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 9

A radioactive sample has a half-life of 10 years. If the initial activity of the sample is 1000 Bq, what is the activity of the sample after 20 years?

A. 250 Bq

Correct B. 500 Bq

C. 750 Bq

D. 1000 Bq

Correct Answer: B

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Question 10

A particle of mass 1 kg is moving in a circular path of radius 2 m with a cons\tant speed of 3 m/s. If the particle is subject to a centripetal force of 9 N, what is the magnitude of the acceleration of the particle?

A. 6 m/s^2

Correct B. 9 m/s^2

C. 12 m/s^2

D. 15 m/s^2

Correct Answer: B

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Question 11

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

A. 8 N

B. 10 N

Correct C. 12 N

D. 16 N

Correct Answer: C

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Question 12

A capacitor consists of two parallel plates, each of area 0.1 m^2, separated by a dis\tance of 0.01 m. If the plates are charged to a potential difference of 10 V, what is the capaci\tance of the capacitor?

A. 0.1 F

Correct B. 0.2 F

C. 0.3 F

D. 0.4 F

Correct Answer: B

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Question 13

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

A. 0.25

B. 0.3

Correct C. 0.35

D. 0.4

Correct Answer: C

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Question 14

A particle of mass 1 kg is confined to a one-dimensional box of length 1 m. If the particle is in the ground state, what is the energy of the particle?

Correct A. 0.1 J

B. 0.2 J

C. 0.3 J

D. 0.4 J

Correct Answer: A

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Question 15

A circuit consists of a resistor of 10 ohms and an inductor of 5 henries in series. If the circuit is driven by a voltage source of 20 volts, what is the impedance of the circuit?

A. 10 ohms

B. 12 ohms

Correct C. 14 ohms

D. 16 ohms

Correct Answer: C

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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 force of 12 N, what is its angular velocity?

A. 2 rad/s

Correct B. 4 rad/s

C. 6 rad/s

D. 8 rad/s

Correct Answer: B

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Question 17

A heat engine operates between the temperatures 500 K and 300 K. If the engine absorbs 1000 J of heat from the high-temperature reservoir, what is its efficiency?

A. 0.25

B. 0.33

Correct C. 0.5

D. 0.67

Correct Answer: C

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Question 18

A convex lens of focal length 20 cm is used to form an image of an object placed 30 cm in front of it. What is the magnification of the image?

A. 0.5

Correct B. 1

C. 2

D. 3

Correct Answer: B

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Question 19

A 50 Hz AC voltage is applied across a resistor of 10 ohms. What is the rms value of the current flowing through the resistor?

A. 2 A

Correct B. 5 A

C. 10 A

D. 20 A

Correct Answer: B

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Question 20

A particle of mass 1 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 2 m from its equilibrium position and released, what is its angular frequency?

A. 10 rad/s

Correct B. 20 rad/s

C. 30 rad/s

D. 40 rad/s

Correct Answer: B

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Question 21

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 22

A block of mass 5 kg is attached to a horizontal 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, 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 23

A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 20 V. If the dis\tance between the plates is doubled, what is the new capaci\tance?

A. 5 μF

B. 10 μF

C. 20 μF

Correct D. 40 μF

Correct Answer: D

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Question 24

A 100 Ω resistor and a 200 Ω resistor are connected in series across a 20 V power source. What is the current flowing through the circuit?

A. 0.1 A

Correct B. 0.2 A

C. 0.3 A

D. 0.4 A

Correct Answer: B

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Question 25

A particle moves in a circular path with a cons\tant speed of 5 m/s. If the radius of the circle is 2 m, what is the magnitude of the centripetal acceleration?

A. 2 m/s^2

B. 4 m/s^2

Correct C. 6 m/s^2

D. 8 m/s^2

Correct Answer: C

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