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POST UTME BELLS UNIVERSITY 2024 Physics | Objective

Are you preparing for POST UTME BELLS UNIVERSITY exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2024 Physics (Objective) questions designed to simulate the real exam environment.

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Question 1

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

Correct B. 0.1 s

C. 0.5 s

D. 1 s

Correct Answer: B

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Question 2

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

Correct B. 4 s

C. 6 s

D. 8 s

Correct Answer: B

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Question 3

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

Correct B. 1 m/s^2

C. 2 m/s^2

D. 5 m/s^2

Correct Answer: B

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Question 4

A \tank contains 1000 L of water at a pressure of 1 atm. A valve is opened, allowing water to flow out of the \tank. If the flow rate is 2 L/s, how long will it take for the water level to drop by 10%?

A. 50 s

B. 100 s

Correct C. 200 s

D. 500 s

Correct Answer: C

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Question 5

A coil of wire has an induc\tance of 0.1 H and a resis\tance of 10 Ω. If a current of 2 A is flowing through the coil, what is the energy stored in the coil?

A. 0.1 J

B. 1 J

Correct C. 10 J

D. 100 J

Correct Answer: C

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Question 6

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.

Correct A. 20°

B. 25°

C. 30°

D. 35°

Correct Answer: A

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Question 7

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

Correct C. 30 N

D. 40 N

Correct Answer: C

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Question 8

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

Correct B. 2 atm

C. 2.5 atm

D. 3 atm

Correct Answer: B

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Question 9

A block of mass 5 kg is placed on a frictionless surface and a horizontal force of 10 N is applied to it. Calculate the acceleration of the block.

A. 1 m/s²

Correct B. 2 m/s²

C. 3 m/s²

D. 4 m/s²

Correct Answer: B

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Question 10

A light ray is incident on a convex lens at an angle of 45°. If the focal length of the lens is 10 cm, calculate the angle of re\fraction.

A. 20°

B. 25°

Correct C. 30°

D. 35°

Correct Answer: C

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Question 11

A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 8.0 x 10^-10 F, what is the charge on the plates?

Correct A. 0.16 C

B. 0.32 C

C. 0.64 C

D. 1.28 C

Correct Answer: A

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Question 12

A thermodynamic system undergoes a process from state A to state B. If the initial temperature is 300 K and the final temperature is 400 K, and the change in entropy is 100 J/K, what is the change in internal energy?

A. -100 kJ

B. 0 kJ

Correct C. 100 kJ

D. 200 kJ

Correct Answer: C

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Question 13

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

Correct B. 0.04 mol

C. 0.06 mol

D. 0.08 mol

Correct Answer: B

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Question 14

A magnetic field is produced by a current-carrying wire. If the current is 5 A and the length of the wire is 0.1 m, what is the magnetic field strength?

A. 0.05 T

Correct B. 0.1 T

C. 0.15 T

D. 0.2 T

Correct Answer: B

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Question 15

A capacitor is connected to a battery of voltage 12 V. If the capaci\tance is 10^-6 F, what is the charge on the capacitor?

Correct A. 0.12 C

B. 0.24 C

C. 0.36 C

D. 0.48 C

Correct Answer: A

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Question 16

A particle of mass 2 kg is attached to a spring with a force cons\tant of 100 N/m. If the particle is displaced by 0.2 m from its equilibrium position and released from rest, what is the maximum speed of the particle?

A. 2 m/s

Correct B. 4 m/s

C. 6 m/s

D. 8 m/s

Correct Answer: B

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Question 17

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

Correct C. 0.3 m

D. 0.4 m

Correct Answer: C

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Question 18

A block of mass 5 kg is placed on a frictionless surface and attached to a spring with a force cons\tant of 50 N/m. If the block is displaced by 0.5 m from its equilibrium position and released from rest, what is the period of the block's motion?

A. 2 s

Correct B. 4 s

C. 6 s

D. 8 s

Correct Answer: B

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Question 19

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°

Correct C. 30°

D. 35°

Correct Answer: C

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Question 20

A car is traveling at a speed of 25 m/s when it encounters a hill with a height of 10 m. If the car's kinetic energy is 500 J, what is the car's potential energy at the top of the hill?

A. 200 J

B. 400 J

Correct C. 600 J

D. 800 J

Correct Answer: C

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Question 21

A particle of mass $m$ 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?

Correct A. \frac{mv^2}{r}

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

C. \frac{mv^2}{3r}

D. \frac{mv^2}{4r}

Correct Answer: A

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Question 22

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?

Correct A. \frac{A_0}{2}

B. \frac{A_0}{4}

C. \frac{A_0}{6}

D. \frac{A_0}{8}

Correct Answer: A

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Question 23

A particle of mass $m$ is in a one-dimensional potential well of depth $V_0$ and width $d$. If the particle is in the ground state, what is the energy of the particle?

Correct A. \frac{\hbar^2\pi^2}{2md^2}

B. \frac{\hbar^2\pi^2}{4md^2}

C. \frac{\hbar^2\pi^2}{6md^2}

D. \frac{\hbar^2\pi^2}{8md^2}

Correct Answer: A

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Question 24

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?

Correct A. \frac{q^2v^2}{mr}

B. \frac{q^2v^2}{2mr}

C. \frac{q^2v^2}{3mr}

D. \frac{q^2v^2}{4mr}

Correct Answer: A

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Question 25

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?

Correct A. \frac{A_0}{2}

B. \frac{A_0}{4}

C. \frac{A_0}{6}

D. \frac{A_0}{8}

Correct Answer: A

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