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POST UTME GREENFIELD UNIVERSITY 2025 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 2025 Physics (Objective) questions designed to simulate the real exam environment.

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Question 1

A particle of mass $m$ is moving in a circular path of radius $r$ with a cons\tant speed $v$. If the particle is subjected to a centripetal force $F_c = \frac{mv^2}{r}$, what is the magnitude of the acceleration of the particle?

Correct A. $ \frac{v^2}{r} $

B. $ \frac{mv^2}{r^2} $

C. $ \frac{mv^2}{r} $

D. $ \frac{v}{r} $

Correct Answer: A

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Question 2

A parallel plate capacitor has a capaci\tance of $C = 10\,\mu\text{F}$ and is charged to a potential difference of $V = 20\,\text{V}$. If the dis\tance between the plates is increased by a factor of $2$, what is the new capaci\tance?

A. 5\,\mu\text{F}

B. 20\,\mu\text{F}

Correct C. 40\,\mu\text{F}

D. 50\,\mu\text{F}

Correct Answer: C

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Question 3

A projectile is launched from the origin with an initial velocity of $v_0 = 20\,\text{m/s}$ at an angle of $\theta = 30^\circ$ above the horizontal. What is the maximum height reached by the projectile?

A. 10\,\text{m}

Correct B. 15\,\text{m}

C. 20\,\text{m}

D. 25\,\text{m}

Correct Answer: B

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Question 4

A circuit consists of a $10\,\Omega$ resistor, a $20\,\Omega$ resistor, and a $5\,\Omega$ resistor connected in series. If a voltage of $V = 15\,\text{V}$ is applied across the circuit, what is the current flowing through the $5\,\Omega$ resistor?

A. 0.5\,\text{A}

B. 1.0\,\text{A}

Correct C. 1.5\,\text{A}

D. 2.0\,\text{A}

Correct Answer: C

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Question 5

A gas is contained in a cylinder of volume $V = 10\,\text{L}$. If the temperature of the gas is increased by $10^\circ\text{C}$, what is the new volume of the gas?

A. 11\,\text{L}

B. 12\,\text{L}

Correct C. 13\,\text{L}

D. 14\,\text{L}

Correct Answer: C

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Question 6

A gas is enclosed in a container with a movable piston. The gas is heated, cau\sing its temperature to increase by 10°C. If the initial volume of the gas is 2.5 liters and the initial temperature is 20°C, what is the final volume of the gas?

A. 3.5 liters

Correct B. 4.5 liters

C. 5.5 liters

D. 6.5 liters

Correct Answer: B

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Question 7

A charged particle is moving through a magnetic field. If the particle has a charge of +2e and a mass of 9.11 x 10^-31 kg, and the magnetic field has a strength of 0.5 T, what is the radius of the particle's path?

A. 0.1 m

B. 0.2 m

Correct C. 0.3 m

D. 0.4 m

Correct Answer: C

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Question 8

A capacitor is connected to a power source with a voltage of 12 V. If the capacitor has a capaci\tance of 10 μF, what is the charge stored on the capacitor?

A. 120 μC

Correct B. 240 μC

C. 360 μC

D. 480 μC

Correct Answer: B

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Question 9

A projectile is launched from the ground with an initial velocity of 20 m/s at an angle of 30° above the horizontal. If the projectile lands 10 m away from the launch point, what is the time of flight?

A. 1.2 s

Correct B. 1.5 s

C. 1.8 s

D. 2.1 s

Correct Answer: B

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Question 10

A sound wave has a frequency of 200 Hz and a wavelength of 0.5 m. If the wave is traveling through a medium with a speed of 340 m/s, what is the amplitude of the wave?

A. 0.05 m

B. 0.1 m

Correct C. 0.15 m

D. 0.2 m

Correct Answer: C

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Question 11

A particle of mass $m$ is confined to a one-dimensional box of length $L$. The ground state wave function of the particle is given by $psi_0(x) = \sqrt{\frac{m}{L}} \sinleft$ \frac{pi x}{L}\right $$. What is the expectation value of the position operator in the ground state?

A. 0

Correct B. \frac{L}{2}

C. L

D. \frac{2L}{\pi}

Correct Answer: B

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Question 12

A wave of frequency $f$ and amplitude $A$ is propagating through a medium with speed $v$. What is the wavelength of the wave?

Correct A. \frac{v}{f}

B. \frac{f}{v}

C. Av

D. \frac{A}{v}

Correct Answer: A

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Question 13

A circuit consists of a resistor $R$, an inductor $L$, and a capacitor $C$ connected in series. The circuit is driven by a voltage source $V_0$. What is the impedance of the circuit?

Correct A. \sqrt{R^2 + $ \omega L - \frac{1}{\omega C} $^2}

B. R + L + C

C. \frac{1}{R} + \frac{1}{L} + \frac{1}{C}

D. \frac{R}{L} + \frac{L}{C}

Correct Answer: A

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Question 14

A block of mass $m$ is moving with velocity $v$ on a frictionless surface. The block is subject to a force $F$ that is perp\endicular to its velocity. What is the acceleration of the block?

Correct A. \frac{F}{m}

B. \frac{mv}{F}

C. \frac{F}{mv}

D. \frac{mv^2}{F}

Correct Answer: A

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Question 15

A capacitor of capaci\tance $C$ is connected to a battery of voltage $V$. What is the charge stored on the capacitor?

Correct A. CV

B. \frac{CV}{2}

C. \frac{V}{C}

D. \frac{C}{V}

Correct Answer: A

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Question 16

A sound wave with a frequency of 200 Hz is emitted from a source moving towards a stationary observer. If the speed of sound in air is 343 m/s, what is the apparent frequency heard by the observer?

A. 220 Hz

B. 240 Hz

Correct C. 260 Hz

D. 280 Hz

Correct Answer: C

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Question 17

A beam of light 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 18

A 10 μF capacitor is connected in series with a 20 Ω resistor and a 50 Hz AC source. What is the impedance of the circuit?

A. 10 Ω

B. 20 Ω

Correct C. 30 Ω

D. 40 Ω

Correct Answer: C

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Question 19

A body of mass 2 kg is moving with a velocity of 5 m/s. If a force of 10 N is applied to the body, what is the acceleration produced?

A. 0.5 m/s²

Correct B. 1 m/s²

C. 2 m/s²

D. 5 m/s²

Correct Answer: B

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Question 20

A 100 W bulb is connected to a 220 V AC source. What is the current drawn by the bulb?

A. 0.25 A

Correct B. 0.5 A

C. 0.75 A

D. 1 A

Correct Answer: B

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Question 21

A gas is heated from 300 K to 400 K at cons\tant volume. If the initial volume is 2.5 L, what is the final volume?

A. 3.33 L

Correct B. 4.17 L

C. 5 L

D. 6.25 L

Correct Answer: B

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Question 22

A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle has a speed of 4 m/s, what is the magnitude of the 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 23

A sound wave has a frequency of 200 Hz and a wavelength of 0.5 m. What is the speed of the sound wave?

A. 100 m/s

Correct B. 200 m/s

C. 300 m/s

D. 400 m/s

Correct Answer: B

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Question 24

A magnetic field is directed along the z-axis. A current-carrying wire is placed in the x-y plane. What is the direction of the force on the wire?

Correct A. Up

B. Down

C. Left

D. Right

Correct Answer: A

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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. What is the current in the circuit?

A. 1 A

B. 2 A

Correct C. 3 A

D. 4 A

Correct Answer: C

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