POST UTME BELLS UNIVERSITY 2024 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A gas is heated from 20°C to 80°C at cons\tant volume. If the initial pressure is 1 atm, calculate the final pressure.
A. 1.5 atm
B. 2 atm
C. 2.5 atm
D. 3 atm
Question 2
A 1000 µF capacitor is connected in series with a 2000 µF capacitor across a 120 V AC supply. Calculate the equivalent capaci\tance and the current flowing through the circuit.
A. 1500 µF
B. 2500 µF
C. 3000 µF
D. 4000 µF
Question 3
A uniform magnetic field of strength 2 T is directed along the z-axis. A current of 5 A flows in a circular loop of radius 0.1 m, placed in the x-y plane. What is the magnitude of the magnetic moment of the loop?
A. 0.5 A m^2
B. 0.1 A m^2
C. 5 A m^2
D. 10 A m^2
Question 4
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
C. 30 N
D. 40 N
Question 5
A block of mass 2 kg is placed on a horizontal, frictionless surface. A horizontal force of 10 N is applied to the block. Find the acceleration of the block.
A. 0.5 m/s^2
B. 1 m/s^2
C. 2 m/s^2
D. 5 m/s^2
Question 6
A charged particle of mass $m$ and charge $q$ is moving in a circular orbit of radius $r$ with a cons\tant speed $v$. If the particle is subjected to a uniform magnetic field of strength $B$, what is the magnitude of the force exerted on the particle?
A. \frac{q^2v^2}{mr}
B. \frac{q^2v^2}{2mr}
C. \frac{q^2v^2}{3mr}
D. \frac{q^2v^2}{4mr}
Question 7
A wave of frequency $f$ and wavelength $\lambda$ is incident on a barrier of width $d$. If the wave is reflected back with a phase shift of $\pi$, what is the magnitude of the reflected wave?
A. \frac{A_0}{2}
B. \frac{A_0}{4}
C. \frac{A_0}{6}
D. \frac{A_0}{8}
Question 8
A light ray 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?
A. 20°
B. 25°
C. 30°
D. 35°
Question 9
A parallel plate capacitor has a capaci\tance of 5 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. 2.5 μF
B. 5 μF
C. 10 μF
D. 20 μF
Question 10
A 2.5 V battery is connected in series with a 10 Ω resistor and a 5 μF capacitor. If the capacitor is initially uncharged, what is the time cons\tant of the circuit?
A. 0.05 s
B. 0.1 s
C. 0.5 s
D. 1 s
Question 11
A particle of mass 0.5 kg is projected from the origin with an initial velocity of 20 m/s at an angle of 60° to the horizontal. Find the time of flight.
A. 2 s
B. 4 s
C. 6 s
D. 8 s
Question 12
A sound wave with a frequency of 200 Hz and a speed of 340 m/s is traveling through a medium. If the wavelength of the wave is 1.7 m, what is the amplitude of the wave?
A. 0.1 m
B. 0.2 m
C. 0.3 m
D. 0.4 m
Question 13
A radioactive sample has a half-life of 5 years. If the initial activity is 100 Bq, what is the activity after 10 years?
A. 12.5 Bq
B. 25 Bq
C. 50 Bq
D. 100 Bq
Question 14
A gas is confined to a cylinder of volume 0.05 m^3. If the pressure is 200 kPa and the temperature is 300 K, what is the number of moles of gas?
A. 0.02 mol
B. 0.04 mol
C. 0.06 mol
D. 0.08 mol
Question 15
A light ray is incident on a glass slab at an angle of 30°. If the re\fractive index of the glass is 1.5, calculate the angle of re\fraction.
A. 20°
B. 25°
C. 30°
D. 35°

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