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POST UTME BSU 2020 Physics | Objective

Are you preparing for POST UTME BSU exams? Reviewing past questions is one of the most effective ways to guarantee a high score. This practice hub features authentic 2020 Physics (Objective) questions designed to simulate the real exam environment.

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Question 1

A parallel plate capacitor with plates of area 0.04 m^2 and separation 0.02 m is charged to a potential difference of 10 V. If the capaci\tance is 2.5 x 10^-6 F, calculate the energy stored in the capacitor.

A. 1.25 x 10^-4 J

Correct B. 2.5 x 10^-4 J

C. 5 x 10^-4 J

D. 10 x 10^-4 J

Correct Answer: B

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Question 2

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.

Correct A. 20°

B. 30°

C. 40°

D. 50°

Correct Answer: A

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Question 3

A sound wave has a frequency of 200 Hz and a wavelength of 0.5 m. Calculate the speed of the sound wave.

A. 100 m/s

Correct B. 200 m/s

C. 300 m/s

D. 400 m/s

Correct Answer: B

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Question 4

A particle moves in a circular path with a radius of 2 m. If the particle completes one revolution in 4 s, calculate the angular velocity.

A. 0.5 rad/s

Correct B. 1 rad/s

C. 1.5 rad/s

D. 2 rad/s

Correct Answer: B

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Question 5

A circuit consists of a 12 V battery, a 4 Ω resistor, and a 6 Ω resistor connected in series. Calculate the total resis\tance.

A. 8 Ω

B. 10 Ω

Correct C. 12 Ω

D. 16 Ω

Correct Answer: C

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Question 6

A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the capaci\tance is 2.5 x 10^-10 F, what is the charge on the plates when the potential difference between them is 100 V?

Correct A. 0.25 C

B. 0.5 C

C. 1 C

D. 2 C

Correct Answer: A

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Question 7

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 10 J/K, what is the change in internal energy?

A. -1000 J

B. -500 J

Correct C. 0 J

D. 500 J

Correct Answer: C

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Question 8

A particle of mass 2 kg is moving in a circular path with a radius of 3 m. If the particle has a velocity of 4 m/s, what is the centripetal acceleration?

A. 0.5 m/s^2

B. 1 m/s^2

Correct C. 2 m/s^2

D. 4 m/s^2

Correct Answer: C

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Question 9

A convex lens has a focal length of 20 cm. If an object is placed 30 cm in front of the lens, what is the image dis\tance?

Correct A. -20 cm

B. -10 cm

C. 10 cm

D. 20 cm

Correct Answer: A

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Question 10

A photon has an energy of 2.5 eV. If the wavelength of the photon is 500 nm, what is the momentum of the photon?

A. 1.5 x 10^-24 kg m/s

Correct B. 3 x 10^-24 kg m/s

C. 4.5 x 10^-24 kg m/s

D. 6 x 10^-24 kg m/s

Correct Answer: B

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Question 11

A parallel plate capacitor has a capaci\tance of 5 μF. If a potential difference of 10 V is applied across the plates, what is the charge stored on each plate?

A. 50 μC

Correct B. 100 μC

C. 200 μC

D. 500 μC

Correct Answer: B

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Question 12

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. What is the magnitude of the force acting on the particle?

A. 12 N

B. 24 N

Correct C. 48 N

D. 96 N

Correct Answer: C

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Question 13

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

A. 10°

Correct B. 20°

C. 30°

D. 40°

Correct Answer: B

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Question 14

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, how long does the journey take?

A. 4 h

Correct B. 6 h

C. 8 h

D. 10 h

Correct Answer: B

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Question 15

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

Correct C. 6 m/s

D. 8 m/s

Correct Answer: C

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Question 16

A 2.5 m long wire of resis\tance 3.2 Ω is connected in series with a 4.5 V battery. If the current through the wire is 0.8 A, what is the potential difference across the wire?

Correct A. 2.56 V

B. 3.2 V

C. 4.5 V

D. 6.4 V

Correct Answer: A

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Question 17

A particle of mass 0.5 kg is moving in a circular path of radius 2 m with a cons\tant speed of 4 m/s. What is the magnitude of the force acting on the particle?

A. 10 N

Correct B. 20 N

C. 30 N

D. 40 N

Correct Answer: B

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Question 18

A wave of frequency 50 Hz and wavelength 10 m is traveling through a medium. What is the speed of the wave?

A. 250 m/s

Correct B. 500 m/s

C. 750 m/s

D. 1000 m/s

Correct Answer: B

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Question 19

A body is at rest on a horizontal frictionless surface. A force of 20 N is applied to the body for 5 s. What is the velocity of the body after the force is removed?

A. 1 m/s

Correct B. 2 m/s

C. 3 m/s

D. 4 m/s

Correct Answer: B

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Question 20

A 5 kg block is attached to a horizontal spring with a spring cons\tant of 100 N/m. The block is displaced by 2 m from its equilibrium position and released from rest. What is the maximum speed of the block?

A. 2 m/s

B. 4 m/s

Correct C. 6 m/s

D. 8 m/s

Correct Answer: C

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Question 21

A particle of mass $m$ is attached to a spring with spring cons\tant $k$. The particle is displaced from its equilibrium position by a dis\tance $x_0$ and released from rest. Assuming the motion is simple harmonic, find the angular frequency $omega$ of the particle's motion.

Correct A. \sqrt{\frac{k}{m}}

B. \frac{k}{m}

C. \frac{m}{k}

D. \frac{1}{\sqrt{mk}}

Correct Answer: A

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Question 22

A sound wave with frequency $f$ is traveling through a medium with speed $v$. If the wavelength of the sound wave is $\lambda$, find the period $T$ of the sound wave.

Correct A. \frac{\lambda}{v}

B. \frac{v}{\lambda}

C. \frac{f}{v}

D. \frac{v}{f}

Correct Answer: A

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Question 23

A circuit consists of a resistor $R$, an inductor $L$, and a capacitor $C$ connected in series. If the circuit is driven by an AC voltage source with frequency $f$, find the impedance $Z$ of the circuit.

Correct A. \sqrt{R^2 + $ \omega L - \frac{1}{\omega C} $^2}

B. \sqrt{R^2 + $ \omega C - \frac{1}{\omega L} $^2}

C. \sqrt{$ \omega L - \frac{1}{\omega C} $^2 + R^2}

D. \sqrt{$ \omega C - \frac{1}{\omega L} $^2 + R^2}

Correct Answer: A

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Question 24

A magnetic field $B$ is produced by a current-carrying wire. If the wire is bent into a circular loop of radius $r$, find the magnetic field $B$ at the center of the loop.

Correct A. \frac{\mu_0 I}{2r}

B. \frac{\mu_0 I}{r}

C. \frac{2\mu_0 I}{r}

D. \frac{\mu_0 I}{4r}

Correct Answer: A

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Question 25

A nucleus of mass number $A$ and atomic number $Z$ undergoes radioactive decay. If the decay cons\tant is $\lambda$, find the activity $A$ of the nucleus.

Correct A. \lambda N

B. \frac{\lambda N}{A}

C. \frac{A \lambda}{N}

D. \frac{N \lambda}{A}

Correct Answer: A

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