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POST UTME GREENFIELD UNIVERSITY 2022 Physics | Objective

Are you preparing for POST UTME GREENFIELD UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2022 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 orbit of radius 3 m with a speed of 4 m/s. If the particle is subject to a centripetal force of 12 N, what is the angular velocity of the particle?

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 2

A radioactive sample has an initial activity of 100 Bq. If the half-life of the sample is 2 hours, what is the activity of the sample after 4 hours?

Correct A. 25 Bq

B. 50 Bq

C. 75 Bq

D. 100 Bq

Correct Answer: A

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Question 3

A 10 μF capacitor is connected in series with a 20 Ω resistor and a 50 V battery. What is the current flowing through the circuit?

A. 0.25 A

Correct B. 0.5 A

C. 1 A

D. 2 A

Correct Answer: B

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Question 4

A gas is confined to a cylinder of volume 2 m^3 at a temperature of 300 K. If the gas is heated to a temperature of 400 K, what is the new volume of the gas?

A. 2.5 m^3

B. 3 m^3

Correct C. 3.5 m^3

D. 4 m^3

Correct Answer: C

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Question 5

A 50 Hz AC voltage is applied across a 20 Ω resistor. What is the rms value of the current flowing through the resistor?

A. 1 A

Correct B. 2 A

C. 3 A

D. 4 A

Correct Answer: B

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Question 6

A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.5 m from its equilibrium position and released from rest, what is the angular frequency of the resulting simple harmonic motion?

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 7

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

A. 20°

B. 25°

Correct C. 30°

D. 35°

Correct Answer: C

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Question 8

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. 2 Ω

B. 4 Ω

C. 6 Ω

Correct D. 8 Ω

Correct Answer: D

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Question 9

A wave has a frequency of 50 Hz and a wavelength of 0.2 m. What is the speed of the wave?

A. 10 m/s

B. 20 m/s

C. 30 m/s

Correct D. 40 m/s

Correct Answer: D

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Question 10

A particle of mass 1 kg is moving in a circular path with a radius of 0.5 m. If the particle has a speed of 5 m/s, what is the centripetal acceleration?

A. 5 m/s^2

B. 10 m/s^2

Correct C. 15 m/s^2

D. 20 m/s^2

Correct Answer: C

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Question 11

A radioactive sample emits \alpha particles with a half-life of 5 minutes. If the initial activity is 100 Bq, what is the activity after 20 minutes?

A. 50 Bq

B. 25 Bq

Correct C. 12.5 Bq

D. 6.25 Bq

Correct Answer: C

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Question 12

A sound wave with a frequency of 200 Hz is traveling through a medium with a speed of 340 m/s. What is the wavelength of the sound wave?

Correct A. 1.7 m

B. 1.4 m

C. 1.1 m

D. 0.9 m

Correct Answer: A

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Question 13

A convex lens with a focal length of 20 cm is used to form an image of an object placed 30 cm away. What is the magnification of the image?

Correct A. -0.5

B. -1

C. -1.5

D. -2

Correct Answer: A

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Question 14

A magnetic field with a strength of 0.5 T is applied to a current-carrying wire. If the current is 2 A, what is the force on the wire?

A. 0.1 N

Correct B. 0.2 N

C. 0.3 N

D. 0.4 N

Correct Answer: B

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Question 15

A simple harmonic motion with an amplitude of 2 m and a frequency of 3 Hz is described by the equation x(t) = 2 \sin(3t). What is the angular frequency?

A. 6 rad/s

Correct B. 12 rad/s

C. 18 rad/s

D. 24 rad/s

Correct Answer: B

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Question 16

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?

Correct A. 20°

B. 30°

C. 45°

D. 60°

Correct Answer: A

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Question 17

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

Correct B. 20 N

C. 30 N

D. 40 N

Correct Answer: B

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Question 18

A heat engine operates between two temperatures of 500 K and 300 K. If the efficiency of the engine is 30%, what is the work done by the engine per cycle?

A. 100 J

Correct B. 200 J

C. 300 J

D. 400 J

Correct Answer: B

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Question 19

A gas expands from an initial volume of 2 L to a final volume of 5 L against an external pressure of 2 atm. What is the work done by the gas?

A. 10 J

Correct B. 20 J

C. 30 J

D. 40 J

Correct Answer: B

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Question 20

A particle of mass 1 kg is moving in a straight line with an initial velocity of 5 m/s. If the particle experiences a force of 10 N for 2 s, what is the final velocity of the particle?

A. 10 m/s

Correct B. 15 m/s

C. 20 m/s

D. 25 m/s

Correct Answer: B

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

A. 12 m/s^2

Correct B. 16 m/s^2

C. 20 m/s^2

D. 24 m/s^2

Correct Answer: B

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Question 22

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

Correct A. 0.5 A

B. 1 A

C. 1.5 A

D. 2 A

Correct Answer: A

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Question 23

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 change in its kinetic energy?

A. 50 J

Correct B. 100 J

C. 150 J

D. 200 J

Correct Answer: B

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Question 24

A simple harmonic motion has a time period of 2 s and an amplitude of 3 m. What is the maximum acceleration of the particle?

A. 6 m/s^2

B. 12 m/s^2

Correct C. 18 m/s^2

D. 24 m/s^2

Correct Answer: C

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Question 25

A 100 W bulb is connected to a 220 V power supply. What is the current flowing through the bulb?

A. 0.4 A

Correct B. 0.5 A

C. 0.6 A

D. 0.7 A

Correct Answer: B

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