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POST UTME KSU 2024 Physics | Objective

Are you preparing for POST UTME KSU 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 gas is heated from 300 K to 400 K at cons\tant volume. If the initial volume is 2.5 L and the gas cons\tant is 0.082 L atm/mol K, what is the final pressure of the gas in atm?

A. 1.5 atm

B. 2.5 atm

Correct C. 3.0 atm

D. 4.0 atm

Correct Answer: C

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Question 2

A particle of mass 0.5 kg is moving in a circular path with a radius of 2 m. If the particle has a speed of 4 m/s, what is the magnitude of the centripetal acceleration?

A. 2 m/s^2

B. 4 m/s^2

Correct C. 6 m/s^2

D. 8 m/s^2

Correct Answer: C

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Question 3

A light ray passes through a prism with an angle of incidence of 30° and an angle of re\fraction of 20°. If the angle of the prism is 60°, what is the angle of deviation?

A. 10°

Correct B. 20°

C. 30°

D. 40°

Correct Answer: B

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Question 4

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

A. 0.1 m

Correct B. 0.2 m

C. 0.3 m

D. 0.4 m

Correct Answer: B

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Question 5

A magnetic field has a strength of 0.5 T and a direction that is perp\endicular to the plane of the page. If a current of 2 A is flowing in a wire that is parallel to the magnetic field, what is the magnitude of the force on the wire?

A. 0.5 N

B. 1.0 N

Correct C. 1.5 N

D. 2.0 N

Correct Answer: C

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Question 6

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 acceleration of 2 m/s^2, what is the magnitude of the force acting on the particle?

A. 8 N

B. 16 N

Correct C. 32 N

D. 64 N

Correct Answer: C

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Question 7

A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in parallel. What is the total resis\tance of the circuit?

A. 2 Ω

Correct B. 4 Ω

C. 6 Ω

D. 8 Ω

Correct Answer: B

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Question 8

A block of mass 5 kg is moving with a velocity of 10 m/s. If it is subjected to a force of 20 N, what is the acceleration of the block?

A. 0.2 m/s^2

Correct B. 0.4 m/s^2

C. 0.6 m/s^2

D. 0.8 m/s^2

Correct Answer: B

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Question 9

A radioactive sample has a half-life of 2 years. If the initial activity is 100 Bq, what is the activity after 4 years?

A. 12.5 Bq

Correct B. 25 Bq

C. 50 Bq

D. 100 Bq

Correct Answer: B

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Question 10

A capacitor of capaci\tance 10 μF is connected to a 12 V battery. What is the charge stored 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 11

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. 10 m/s^2

Correct B. 12 m/s^2

C. 15 m/s^2

D. 20 m/s^2

Correct Answer: B

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Question 12

A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 12 V. If the dis\tance between the plates is doubled, what is the new potential difference?

A. 6 V

B. 8 V

Correct C. 10 V

D. 12 V

Correct Answer: C

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Question 13

A current of 5 A flows through a resistor of 10 Ω. If the power consumed is 25 W, what is the voltage across the resistor?

A. 5 V

Correct B. 10 V

C. 15 V

D. 20 V

Correct Answer: B

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Question 14

A radioactive sample has a half-life of 10 years. If the initial activity is 100 Bq, what is the activity after 20 years?

A. 25 Bq

Correct B. 50 Bq

C. 75 Bq

D. 100 Bq

Correct Answer: B

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Question 15

A wave has a frequency of 20 Hz and a wavelength of 0.5 m. What is the speed of the wave?

A. 10 m/s

Correct B. 20 m/s

C. 30 m/s

D. 40 m/s

Correct Answer: B

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Question 16

A particle of mass $m$ is moving in a circular orbit of radius $r$ under the influence of a central force $F(r) = -\frac{k}{r^2}$. If the particle's speed is $v$, what is its angular momentum $L$?

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

Correct B. \frac{mv^2r}{\sqrt{k}}

C. \frac{mv^2}{\sqrt{k}}

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

Correct Answer: B

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Question 17

A light ray passes through a prism of angle $\theta$ and is re\fracted at an angle $\phi$. If the prism has a re\fractive index $n$, what is the angle of deviation $\delta$?

Correct A. \sin^{-1}$ \frac{n\sin\phi}{\sin\theta} $

B. \sin^{-1}$ \frac{n\sin\theta}{\sin\phi} $

C. \sin^{-1}$ \frac{n\sin\phi}{\cos\theta} $

D. \sin^{-1}$ \frac{n\sin\theta}{\cos\phi} $

Correct Answer: A

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Question 18

A particle of mass $m$ is moving in a simple harmonic motion with angular frequency $\omega$. If the particle's displacement from the equilibrium position is $x$, what is its kinetic energy $K$?

Correct A. \frac{1}{2}m\omega^2x^2

B. \frac{1}{2}m\omega^2

C. \frac{1}{2}m\omega^2x

D. \frac{1}{2}m\omega^2x^3

Correct Answer: A

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Question 19

A light wave has a frequency $f$ and a wavelength $\lambda$. If the wave is traveling through a medium with re\fractive index $n$, what is its speed $v$?

Correct A. \frac{c}{n}

B. \frac{c}{\lambda}

C. \frac{f}{n}

D. \frac{f\lambda}{n}

Correct Answer: A

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Question 20

A particle of mass $m$ is moving in a circular orbit of radius $r$ under the influence of a central force $F(r) = -\frac{k}{r^2}$. If the particle's speed is $v$, what is its potential energy $U$?

Correct A. \frac{-k}{r}

B. \frac{k}{r}

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

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

Correct Answer: A

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Question 21

A parallel plate capacitor has a capaci\tance of 2 μF and is charged to a potential difference of 10 V. If a dielectric slab of thickness 0.5 mm and relative permittivity 4 is inserted between the plates, what is the new capaci\tance?

A. 4 μF

Correct B. 8 μF

C. 12 μF

D. 16 μF

Correct Answer: B

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Question 22

A 100 W light bulb is connected to a 220 V power source. If the bulb is 5% efficient, what is the current drawn from the power source?

A. 0.45 A

Correct B. 0.50 A

C. 0.55 A

D. 0.60 A

Correct Answer: B

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Question 23

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

A. 1.4 m/s

B. 1.6 m/s

Correct C. 1.8 m/s

D. 2.0 m/s

Correct Answer: C

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Question 24

A ray of light passes from air into a glass slab with a re\fractive index of 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?

A. 18°

Correct B. 20°

C. 22°

D. 24°

Correct Answer: B

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Question 25

A car travels from point A to point B with an average speed of 60 km/h. If the dis\tance between the two points is 240 km, what is the time taken to travel from point A to point B?

A. 4 hours

Correct B. 4.5 hours

C. 5 hours

D. 5.5 hours

Correct Answer: B

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