POST UTME GREENFIELD UNIVERSITY 2025 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
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 2
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 3
A block of mass 5 kg is attached to a horizontal spring with a force cons\tant of 200 N/m. If the block is displaced by 0.2 m from its equilibrium position and released, what is the maximum speed of the block?
A. 2 m/s
B. 4 m/s
C. 6 m/s
D. 8 m/s
Question 4
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?
A. \frac{F}{m}
B. \frac{mv}{F}
C. \frac{F}{mv}
D. \frac{mv^2}{F}
Question 5
A 10 kg block is moving with a velocity of 5 m/s on a horizontal surface. If a force of 20 N is applied to the block in the direction of motion, calculate the acceleration of the block.
A. 0.2 m/s^2
B. 0.5 m/s^2
C. 1.0 m/s^2
D. 2.0 m/s^2
Question 6
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 7
A 2.0 × 10⁴ kg block is moving with a speed of 4.0 × 10⁲ m/s on a horizontal surface. The block is brought to rest by a cons\tant force of 1.0 × 10⁳ N. What is the time taken to stop the block?
A. 1.0 × 10⁲ s
B. 1.2 × 10⁲ s
C. 1.5 × 10⁲ s
D. 2.0 × 10⁲ s
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
B. 240 μC
C. 360 μC
D. 480 μC
Question 9
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
C. 30 Ω
D. 40 Ω
Question 10
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. 2 m/s^2
B. 4 m/s^2
C. 6 m/s^2
D. 8 m/s^2
Question 11
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 12
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.
A. 20°
B. 30°
C. 40°
D. 50°
Question 13
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 14
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 15
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
B. 200 m/s
C. 300 m/s
D. 400 m/s

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