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POST UTME AFE BABALOLA UNIVERSITY 2018 Physics | Objective

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Question 1 View Details

A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 5 V battery. U\sing Kirchhoff's voltage law, find the current through the 10 Ω resistor.

Correct A. 0.25 A

B. 0.5 A

C. 1 A

D. 2 A

Correct Answer: A

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Question 2 View Details

A particle of mass 2 kg is moving in a circular path of radius 3 m with a speed of 4 m/s. Find the magnitude of the 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 3 View Details

A wave has a frequency of 100 Hz and a wavelength of 0.1 m. Find the speed of the wave.

A. 10 m/s

B. 20 m/s

C. 30 m/s

Correct D. 40 m/s

Correct Answer: D

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Question 4 View Details

A light wave has a wavelength of 500 nm and a frequency of 6 x 10^14 Hz. Find the speed of the light wave.

A. 3 x 10^8 m/s

B. 3.5 x 10^8 m/s

Correct C. 4 x 10^8 m/s

D. 4.5 x 10^8 m/s

Correct Answer: C

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Question 5 View Details

A sound wave has a frequency of 200 Hz and a wavelength of 1.5 m. Find the speed of the sound wave.

A. 300 m/s

B. 400 m/s

Correct C. 500 m/s

D. 600 m/s

Correct Answer: C

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Question 6 View Details

A 10 Ω resistor is connected in series with a 20 Ω resistor and a 30 Ω resistor. If a potential difference of 12 V is applied across the circuit, what is the current flowing through the 10 Ω resistor?

Correct A. 0.2 A

B. 0.4 A

C. 0.6 A

D. 0.8 A

Correct Answer: A

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Question 7 View Details

A wave has a frequency of 50 Hz and a wavelength of 0.5 m. What is its speed?

A. 10 m/s

B. 20 m/s

Correct C. 25 m/s

D. 30 m/s

Correct Answer: C

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Question 8 View Details

A body of mass 2 kg is moving with a velocity of 5 m/s. What is its kinetic energy?

A. 10 J

B. 20 J

Correct C. 25 J

D. 30 J

Correct Answer: C

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Question 9 View Details

A circuit consists of a 100 Ω resistor, a 200 Ω resistor, and a 300 Ω resistor connected in parallel. If a potential difference of 12 V is applied across the circuit, what is the current flowing through the 100 Ω resistor?

Correct A. 68.18 A

B. 70 A

C. 72 A

D. 74 A

Correct Answer: A

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Question 10 View Details

A gas expands from 1 L to 2 L against a cons\tant external pressure of 2 atm. What is the work done?

A. 1 L atm

Correct B. 2 L atm

C. 3 L atm

D. 4 L atm

Correct Answer: B

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Question 11 View Details

A parallel plate capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 12 V. If a dielectric slab of thickness 2 mm and dielectric cons\tant 4 is inserted between the plates, what is the new capaci\tance?

A. 8 μF

B. 12 μF

Correct C. 16 μF

D. 20 μF

Correct Answer: C

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Question 12 View Details

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

A. 20°

Correct B. 30°

C. 40°

D. 50°

Correct Answer: B

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Question 13 View Details

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 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 14 View Details

A 100 W light bulb is connected to a 220 V power source. What is the current drawn by the bulb?

A. 0.4 A

Correct B. 0.5 A

C. 0.6 A

D. 0.7 A

Correct Answer: B

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Question 15 View Details

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 16 View Details

A particle of mass 2 kg is attached to a spring with a spring cons\tant of 100 N/m. If the particle is displaced by 0.2 m from its equilibrium position and released from rest, determine the angular frequency of the simple harmonic motion.

A. 10 rad/s

Correct B. 20 rad/s

C. 5 rad/s

D. 15 rad/s

Correct Answer: B

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Question 17 View Details

A beam of light passes from air into a glass of re\fractive index 1.5. If the angle of incidence is 30°, determine the angle of re\fraction.

A. 20°

Correct B. 25°

C. 15°

D. 30°

Correct Answer: B

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Question 18 View Details

A radioactive sample decays according to the equation N(t) = N0e^\( -λt \), where N(t) is the number of nuclei remaining after time t, N0 is the initial number of nuclei, λ is the decay cons\tant, and t is time. If the half-life of the sample is 10 years, determine the decay cons\tant.

Correct A. 0.0693 yr^\( -1 \)

B. 0.693 yr^\( -1 \)

C. 0.069 yr^\( -1 \)

D. 0.693 yr^\( -1 \)

Correct Answer: A

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Question 19 View Details

A particle of mass 1 kg is moving in a circular path of radius 2 m with a speed of 4 m/s. Determine the centripetal force acting on the particle.

Correct A. 10 N

B. 20 N

C. 5 N

D. 15 N

Correct Answer: A

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Question 20 View Details

A beam of light is incident on a mirror at an angle of 45°. Determine the angle of reflection.

Correct A. 45°

B. 30°

C. 60°

D. 90°

Correct Answer: A

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Question 21 View Details

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?

Correct A. 5.33 m/s^2

B. 6.67 m/s^2

C. 7.78 m/s^2

D. 8.89 m/s^2

Correct Answer: A

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Question 22 View Details

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 2 mm and dielectric cons\tant 3 is inserted between the plates, what is the new capaci\tance?

A. 2 μF

Correct B. 3 μF

C. 4 μF

D. 5 μF

Correct Answer: B

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Question 23 View Details

A gas is contained in a cylinder of volume 10 L at a temperature of 300 K. If the gas is heated to a temperature of 400 K, what is the new volume?

A. 10 L

Correct B. 13.33 L

C. 16.67 L

D. 20 L

Correct Answer: B

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Question 24 View Details

A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 30 Ω resistor connected in series. If a voltage of 20 V is applied across the circuit, what is the current through the circuit?

A. 0.25 A

Correct B. 0.33 A

C. 0.5 A

D. 0.67 A

Correct Answer: B

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Question 25 View Details

A block of mass 5 kg is attached to a horizontal spring with a spring cons\tant of 20 N/m. If the block is displaced by 2 m from its equilibrium position and released, what is the maximum speed of the block?

A. 2 m/s

Correct B. 4 m/s

C. 6 m/s

D. 8 m/s

Correct Answer: B

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