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POST UTME GREENFIELD UNIVERSITY 2020 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 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 of the particle?

A. 16 m/s^2

B. 12 m/s^2

Correct C. 8 m/s^2

D. 20 m/s^2

Correct Answer: C

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Question 2

A gas occupies a volume of 2.5 L at a pressure of 1.5 atm. If the pressure is increased to 3.0 atm, what is the new volume of the gas?

A. 1.67 L

Correct B. 2.33 L

C. 3.33 L

D. 4.67 L

Correct Answer: B

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Question 3

A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. What is the maximum height reached by the projectile?

A. 10.0 m

Correct B. 12.5 m

C. 15.0 m

D. 17.5 m

Correct Answer: B

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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. What is the current flowing through the circuit?

A. 1.5 A

Correct B. 2.0 A

C. 2.5 A

D. 3.0 A

Correct Answer: B

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Question 5

A capacitor of capaci\tance 10 μF is charged to a potential difference of 12 V. What is the energy stored in the capacitor?

A. 0.72 J

B. 1.08 J

Correct C. 1.44 J

D. 1.80 J

Correct Answer: C

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Question 6

A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If a potential difference of 10 V is applied across the plates, calculate the capaci\tance.

Correct A. 2.5 x 10^-11 F

B. 2.5 x 10^-12 F

C. 2.5 x 10^-13 F

D. 2.5 x 10^-14 F

Correct Answer: A

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Question 7

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

A. 5 m/s

Correct B. 50 m/s

C. 500 m/s

D. 5000 m/s

Correct Answer: B

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Question 8

A ray of light 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?

Correct A. 20°

B. 30°

C. 40°

D. 50°

Correct Answer: A

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Question 9

A particle moves in a circular path with a radius of 0.1 m. If it completes one revolution in 2 seconds, what is its angular velocity?

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 10

A simple harmonic motion has a maximum displacement of 0.05 m and a period of 2 seconds. What is its angular frequency?

A. 3.14 rad/s

Correct B. 6.28 rad/s

C. 9.42 rad/s

D. 12.57 rad/s

Correct Answer: B

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Question 11

A charged particle moves through a uniform magnetic field. If the particle's velocity is perp\endicular to the magnetic field, what is the direction of the force exerted on the particle?

A. Towards the center of the magnetic field

B. Away from the center of the magnetic field

C. Perp\endicular to the magnetic field

Correct D. Circular motion around the magnetic field

Correct Answer: D

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Question 12

A sound wave with a frequency of 200 Hz has a wavelength of 1.5 m. What is the speed of the sound wave?

A. 300 m/s

B. 400 m/s

Correct C. 500 m/s

D. 600 m/s

Correct Answer: C

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Question 13

A capacitor consists of two parallel plates separated by a dis\tance of 2 mm. The capaci\tance of the capacitor is 10 μF. If a potential difference of 5 V is applied across the capacitor, what is the charge stored on the capacitor?

A. 50 μC

Correct B. 100 μC

C. 150 μC

D. 200 μC

Correct Answer: B

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Question 14

A vector has a magnitude of 5 units and makes an angle of 30° with the positive x-axis. What is the x-component of the vector?

Correct A. 2.5 units

B. 3.5 units

C. 4.5 units

D. 5.5 units

Correct Answer: A

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Question 15

A gas expands from an initial volume of 2 L to a final volume of 5 L. If the initial pressure is 2 atm, what is the final pressure?

A. 1 atm

B. 2 atm

Correct C. 3 atm

D. 4 atm

Correct Answer: C

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Question 16

A radioactive sample of Δₗ emits Δₗₙ particles with a half-life of 5.3 years. If the initial activity is 2.5 × 10¹ Bq, what is the activity after 10 years?

A. 1.2 × 10¹ Bq

B. 1.5 × 10¹ Bq

Correct C. 1.8 × 10¹ Bq

D. 2.0 × 10¹ Bq

Correct Answer: C

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Question 17

A 2.0 kg block is attached to a horizontal, massless spring with a force cons\tant of 100 N/m. If the block is displaced by 0.20 m from its equilibrium position and released from rest, what is the speed of the block when it passes through the equilibrium position?

A. 0.50 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 18

A point charge of +2.0 µC is placed at the origin. A second point charge of -3.0 µC is placed at a dis\tance of 0.20 m from the origin. What is the electric potential at a point 0.10 m from the origin?

A. -1.5 × 10³ V

B. -2.0 × 10³ V

Correct C. -2.5 × 10³ V

D. -3.0 × 10³ V

Correct Answer: C

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Question 19

A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 60° above the horizontal. What is the maximum height reached by the projectile?

A. 10.0 m

B. 12.0 m

Correct C. 14.0 m

D. 16.0 m

Correct Answer: C

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Question 20

A 100 µF temperature change is observed in a thermodynamic system. If the initial temperature is 300 K, what is the change in entropy?

A. -0.10 kJ/K

B. -0.20 kJ/K

Correct C. -0.30 kJ/K

D. -0.40 kJ/K

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 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 22

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 capaci\tance of the capacitor is 10^-6 F, what is the charge stored on the capacitor when a potential difference of 10 V is applied across it?

Correct A. 10^-5 C

B. 10^-4 C

C. 10^-3 C

D. 10^-2 C

Correct Answer: A

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Question 23

A heat engine operates between the temperatures 300 K and 600 K. If the efficiency of the engine is 30%, what is the work done by the engine per cycle?

A. 100 J

B. 200 J

Correct C. 300 J

D. 400 J

Correct Answer: C

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Question 24

A 10 V, 5 A current is passed through a resistor of 2 ohms for 10 seconds. What is the energy dissipated in the resistor?

A. 50 J

B. 100 J

Correct C. 150 J

D. 200 J

Correct Answer: C

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Question 25

A 100 V, 10 A current is passed through a capacitor of 10^-6 F for 10 seconds. What is the energy stored in the capacitor?

A. 10^-3 J

B. 10^-2 J

C. 10^-1 J

Correct D. 1 J

Correct Answer: D

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