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POST UTME GREENFIELD UNIVERSITY 2024 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 2024 Physics (Objective) questions designed to simulate the real exam environment.

Practice these randomly selected questions to test your readiness.

Question 1

A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 20 V is applied across the plates, calculate the energy stored in the capacitor.

Correct A. 0.2 J

B. 2 J

C. 20 J

D. 200 J

Correct Answer: A

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Question 2

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. Calculate the magnitude of 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 3

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

Correct A. 20°

B. 30°

C. 40°

D. 50°

Correct Answer: A

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Question 4

A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. Calculate 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 5

A gas occupies a volume of 2 L at a pressure of 1 atm and a temperature of 300 K. Calculate the volume of the gas at a pressure of 2 atm and a temperature of 400 K.

A. 1 L

B. 2 L

Correct C. 3 L

D. 4 L

Correct Answer: C

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Question 6

A 2.5 kg block of ice at 0°C is placed in a 10°C water bath. Assuming the specific heat capacity of ice is 2090 J/kg°C and the specific heat capacity of water is 4186 J/kg°C, calculate the time it takes for the ice to melt completely.

A. 10 minutes

B. 20 minutes

Correct C. 30 minutes

D. 40 minutes

Correct Answer: C

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Question 7

A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -15 cm. Find the focal length of the combination.

A. 10 cm

B. 20 cm

Correct C. 30 cm

D. 40 cm

Correct Answer: C

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Question 8

A 100 Ω resistor is connected in series with a 50 Ω resistor and a 20 Ω resistor. What is the equivalent resis\tance of the circuit?

A. 170 Ω

B. 180 Ω

Correct C. 190 Ω

D. 200 Ω

Correct Answer: C

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Question 9

A 5 V battery is connected in series with a 10 Ω resistor and a 20 Ω resistor. What is the current flowing through the circuit?

A. 0.5 A

B. 1 A

Correct C. 1.5 A

D. 2 A

Correct Answer: C

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Question 10

A 10 Ω resistor is connected in parallel with a 20 Ω resistor. What is the equivalent resis\tance of the circuit?

A. 5 Ω

B. 10 Ω

Correct C. 15 Ω

D. 20 Ω

Correct Answer: C

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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 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 12

A parallel plate capacitor has a capaci\tance of 2 μF and is charged to a potential difference of 10 V. If the dis\tance between the plates is doubled, what is the new capaci\tance?

A. 1 μF

B. 2 μF

Correct C. 4 μF

D. 8 μF

Correct Answer: C

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Question 13

A magnetic field of 0.5 T is directed perp\endicular to a current-carrying wire of length 2 m. If the current in the wire is 5 A, what is the magnitude of the force on the wire?

A. 0.1 N

Correct B. 0.5 N

C. 1 N

D. 5 N

Correct Answer: B

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Question 14

A light ray passes from air into a glass slab of thickness 5 cm and 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. 40°

D. 50°

Correct Answer: A

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Question 15

A spring of force cons\tant 100 N/m is stretched by 2 m. If the spring is then released, what is the maximum speed of the spring?

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 16

A 2 kg block of ice at 0°C is placed in a 10°C water bath. Assuming the specific heat capacity of ice is 2090 J/kg°C and the specific heat capacity of water is 4186 J/kg°C, calculate the time it takes for the ice to melt completely.

A. 10 minutes

B. 20 minutes

Correct C. 30 minutes

D. 40 minutes

Correct Answer: C

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Question 17

A 100 Ω resistor is connected in series with a 50 Ω resistor and a 200 Ω resistor. What is the total resis\tance of the circuit?

A. 300 Ω

B. 400 Ω

Correct C. 500 Ω

D. 600 Ω

Correct Answer: C

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Question 18

A particle of mass 1 kg is moving in a circular path with a radius of 2 m. If the particle has a velocity of 5 m/s, what is the centripetal acceleration of the particle?

A. 1 m/s^2

B. 2 m/s^2

Correct C. 3 m/s^2

D. 4 m/s^2

Correct Answer: C

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Question 19

A wave has a frequency of 50 Hz and a wavelength of 0.1 m. What is the speed of the wave?

A. 5 m/s

B. 10 m/s

Correct C. 15 m/s

D. 20 m/s

Correct Answer: C

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Question 20

A 100 V AC supply is connected to a 50 Ω resistor. What is the current flowing through the resistor?

A. 2 A

B. 4 A

Correct C. 6 A

D. 8 A

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

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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Question 22

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 23

A simple harmonic motion has a maximum displacement of 5 cm and a time period of 2 s. If the particle is at its equilibrium position at t = 0, what is its displacement at t = 1.5 s?

A. 2.5 cm

B. 3.75 cm

Correct C. 4.5 cm

D. 5.25 cm

Correct Answer: C

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Question 24

A wave has a frequency of 100 Hz and a wavelength of 0.5 m. If it is traveling through a medium with a speed of 200 m/s, what is its amplitude?

A. 0.1 m

Correct B. 0.2 m

C. 0.3 m

D. 0.4 m

Correct Answer: B

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Question 25

A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. If the current in the circuit is 2 A, what is the potential difference across the 6 Ω resistor?

Correct A. 8 V

B. 12 V

C. 16 V

D. 20 V

Correct Answer: A

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