POST UTME GREENFIELD UNIVERSITY 2025 Physics | Objective

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Question 1
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
B. 240 μC
C. 360 μC
D. 480 μC
Question 2
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
C. 30 N
D. 40 N
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}
B. 15\,\text{m}
C. 20\,\text{m}
D. 25\,\text{m}
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}
C. 1.5\,\text{A}
D. 2.0\,\text{A}
Question 5
A 100 × 10⁴ µF capacitor is connected in series with a 50 × 10⁴ µF capacitor and a 200 × 10⁴ µF resistor. The circuit is driven by a 10 V AC source. What is the impedance of the circuit?
A. 50 × 10⁴ µF
B. 75 × 10⁴ µF
C. 100 × 10⁴ µF
D. 150 × 10⁴ µF
Question 6
A 100 W bulb is connected to a 220 V AC source. What is the current drawn by the bulb?
A. 0.25 A
B. 0.5 A
C. 0.75 A
D. 1 A
Question 7
A magnetic field of magnitude 0.5 T is directed perp\endicular to the plane of a circular loop of radius 0.1 m. If a current of 2 A flows through the loop, what is the magnitude of the magnetic moment of the loop?
A. 0.1 A m^2
B. 0.2 A m^2
C. 0.3 A m^2
D. 0.4 A m^2
Question 8
A particle of mass 2.0 × 10⁴ kg is projected from the origin with an initial velocity of 4.0 × 10⁲ m/s at an angle of 60° to the horizontal. What is the time of flight?
A. 1.0 × 10⁲ s
B. 1.2 × 10⁲ s
C. 1.5 × 10⁲ s
D. 2.0 × 10⁲ s
Question 9
A gas is confined to a cylinder of volume 2 m^3. If the gas is heated from 300 K to 400 K, what is the change in the internal energy of the gas?
A. 1000 J
B. 2000 J
C. 3000 J
D. 4000 J
Question 10
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}
C. 13\,\text{L}
D. 14\,\text{L}
Question 11
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?
A. \( \frac{v^2}{r} \)
B. \( \frac{mv^2}{r^2} \)
C. \( \frac{mv^2}{r} \)
D. \( \frac{v}{r} \)
Question 12
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
C. 0.15 m
D. 0.2 m
Question 13
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}
C. 40\,\mu\text{F}
D. 50\,\mu\text{F}
Question 14
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
B. 4.5 liters
C. 5.5 liters
D. 6.5 liters
Question 15
A heat engine operates between the temperatures of 500 K and 300 K. If the engine absorbs 1000 J of heat energy from the high-temperature reservoir, what is the efficiency of the engine?
A. 0.25
B. 0.30
C. 0.35
D. 0.40

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