POST UTME AAUA 2020 Physics | Objective

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Question 1 View Details
A uniform magnetic field of strength 2 T is applied to a current-carrying wire of length 0.5 m. If the current in the wire is 5 A, what is the magnitude of the magnetic force experienced by the wire?
Correct A. 0.25 N
B. 0.5 N
C. 1 N
D. 2 N

Correct Answer: A

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Question 2 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, what is the maximum velocity of the particle?
A. 0.2 m/s
B. 0.4 m/s
Correct C. 0.6 m/s
D. 0.8 m/s

Correct Answer: C

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Question 3 View Details
A sound wave with a frequency of 200 Hz is traveling through a medium with a speed of 340 m/s. If the wave is reflected off a surface, what is the frequency of the reflected wave?
Correct A. 200 Hz
B. 400 Hz
C. 600 Hz
D. 800 Hz

Correct Answer: A

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Question 4 View Details
A circuit consists of a 10 Ω resistor, a 20 Ω resistor, and a 5 Ω resistor connected in series. If a voltage of 12 V is applied across the circuit, what is the current flowing through the 5 Ω resistor?
A. 0.4 A
B. 0.6 A
Correct C. 0.8 A
D. 1 A

Correct Answer: C

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Question 5 View Details
A photon has an energy of 2.5 eV. If the photon is incident on a metal surface with a work function of 1.5 eV, what is the maximum kinetic energy of the emitted electron?
A. 0.5 eV
Correct B. 1 eV
C. 1.5 eV
D. 2 eV

Correct Answer: B

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Question 6 View Details
A parallel plate capacitor has plates of area 0.04 m^2 and separation 0.02 m. If the dielectric cons\tant of the material between the plates is 3.2, calculate the capaci\tance.
A. 1.6 x 10^-9 F
B. 3.2 x 10^-9 F
Correct C. 6.4 x 10^-9 F
D. 12.8 x 10^-9 F

Correct Answer: C

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Question 7 View Details
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 8 View Details
A current of 2 A flows through a resistor of 4 Ω. Calculate the power dissipated in the resistor.
A. 8 W
Correct B. 16 W
C. 32 W
D. 64 W

Correct Answer: B

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Question 9 View Details
A particle of mass 0.5 kg is moving in a circular path of radius 2 m with a speed of 4 m/s. Calculate the centripetal force acting on the particle.
A. 4 N
B. 8 N
Correct C. 16 N
D. 32 N

Correct Answer: C

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Question 10 View Details
A projectile is launched at an angle of 60° to the horizontal with an initial velocity of 20 m/s. Calculate the time of flight.
A. 2 s
B. 4 s
Correct C. 6 s
D. 8 s

Correct Answer: C

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Question 11 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 force required to stop the particle in 2 s?
A. 24 N
B. 36 N
Correct C. 48 N
D. 60 N

Correct Answer: C

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Question 12 View Details
A 10 μF capacitor is connected in series with a 20 Ω resistor and a 5 V battery. If the switch is closed at t = 0, what is the charge on the capacitor after 5 s?
A. 0.25 C
B. 0.5 C
Correct C. 0.75 C
D. 1 C

Correct Answer: C

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Question 13 View Details
A beam of light is incident on a prism at an angle of 30°. If the re\fractive index of the prism is 1.5, what is the angle of re\fraction?
A. 20°
Correct B. 30°
C. 40°
D. 50°

Correct Answer: B

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Question 14 View Details
A 100 W bulb is connected to a 220 V mains supply. If the bulb is switched on for 5 hours, how much energy is consumed?
A. 1000 J
B. 2000 J
Correct C. 3000 J
D. 4000 J

Correct Answer: C

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Question 15 View Details
A particle of mass 1 kg is moving in a circular path of radius 2 m with a cons\tant speed of 3 m/s. If the particle is subjected to a centripetal force of 6 N, what is the magnitude of the force required to stop the particle in 3 s?
A. 18 N
B. 24 N
Correct C. 30 N
D. 36 N

Correct Answer: C

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Question 16 View Details
A charged particle of mass $m$ and charge $q$ is moving in a circular path of radius $r$ in a uniform magnetic field of strength $B$. If the particle's speed is $v$, what is the magnitude of the magnetic field?
Correct A. \frac{mv}{qr}
B. \frac{qr}{mv}
C. \frac{m^2v^2}{q^2r^2}
D. \frac{q^2r^2}{m^2v^2}

Correct Answer: A

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Question 17 View Details
A sound wave has a frequency of 200 Hz and a wavelength of 1.5 m. What is the speed of the sound wave?
A. 300 m/s
Correct B. 600 m/s
C. 1200 m/s
D. 2400 m/s

Correct Answer: B

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Question 18 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. 12.5 Bq
Correct B. 25 Bq
C. 50 Bq
D. 100 Bq

Correct Answer: B

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Question 19 View Details
A capacitor has a capaci\tance of 10 μF and is charged to a potential difference of 12 V. What is the energy stored in the capacitor?
A. 0.72 J
Correct B. 1.44 J
C. 2.88 J
D. 5.76 J

Correct Answer: B

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Question 20 View Details
A vector has a magnitude of 5 m and makes an angle of 30° with the positive x-axis. What is the x-component of the vector?
A. 2.5 m
Correct B. 4.33 m
C. 5 m
D. 7.07 m

Correct Answer: B

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Question 21 View Details
A 2.5 m long wire of resis\tance 5 Ω is connected in series with a 10 V battery. If the wire is bent into a square loop, what is the total resis\tance of the loop?
A. 6 Ω
Correct B. 7.5 Ω
C. 10 Ω
D. 12.5 Ω

Correct Answer: B

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Question 22 View Details
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
B. 12 N
Correct C. 15 N
D. 20 N

Correct Answer: C

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Question 23 View Details
A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length -15 cm. What is the focal length of the combination?
A. 10 cm
Correct B. 15 cm
C. 20 cm
D. 25 cm

Correct Answer: B

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Question 24 View Details
A 100 W bulb is connected to a 220 V power supply. What is the current drawn by the bulb?
A. 0.5 A
B. 0.7 A
C. 1 A
Correct D. 1.5 A

Correct Answer: D

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Question 25 View Details
A 5 kg block is moving in a straight line with a velocity of 10 m/s. What is the kinetic energy of the block?
A. 25 J
Correct B. 50 J
C. 75 J
D. 100 J

Correct Answer: B

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