POST UTME UNN 2021 Physics | Objective

Practice these randomly selected questions to test your readiness.

Question 1
A wave has a frequency of 50 Hz and a wavelength of 0.2 m. What is the speed of the wave?
A. 10 m/s
B. 20 m/s
C. 30 m/s
D. 40 m/s
Question 2
A spring of spring cons\tant $k$ is stretched by a dis\tance $x$. If the spring is then released, determine the maximum speed of the spring.
A. \( \sqrt{\frac{kx^2}{m}} \)
B. \( \frac{kx^2}{m} \)
C. \( \frac{kx}{m} \)
D. \( \frac{k}{m} \)
Question 3
A 50 Hz, 200 V AC supply is connected across a series RLC circuit with R = 10 Ω, L = 0.1 H, and C = 10 μF. Determine the impedance of the circuit.
A. ( 10.5 Omega )
B. ( 12.5 Omega )
C. ( 15.5 Omega )
D. ( 18.5 Omega )
Question 4
A spring with a spring cons\tant of 100 N/m is stretched by 2 m. Determine the potential energy stored in the spring.
A. \( 200 , \text{J} \)
B. \( 250 , \text{J} \)
C. \( 300 , \text{J} \)
D. \( 350 , \text{J} \)
Question 5
A container of volume $V$ is filled with an ideal gas of mass $m$ at temperature $T$. If the gas is heated to a temperature $T_2$, determine the new pressure of the gas.
A. \( \frac{nRT_2}{V} \)
B. \( \frac{nRT}{V} \)
C. \( \frac{nRT_2}{V^2} \)
D. \( \frac{nRT}{V^2} \)
Question 6
A body of mass 5 kg is moving with a velocity of 10 m/s. Determine the kinetic energy of the body.
A. \( 50 , \text{J} \)
B. \( 60 , \text{J} \)
C. \( 70 , \text{J} \)
D. \( 80 , \text{J} \)
Question 7
A parallel plate capacitor has a capaci\tance of 10 μF. If a potential difference of 20 V is applied across it, what is the charge stored on each plate?
A. 20 μC
B. 40 μC
C. 80 μC
D. 100 μC
Question 8
A particle of mass $m$ is projected from the origin with an initial velocity $v_0$ at an angle $\theta$ to the horizontal. If the particle experiences a uniform gravitational field of strength $g$, determine the time $t$ at which the particle reaches its maximum height.
A. \( \frac{v_0 \sin \theta}{g} \)
B. \( \frac{v_0 \cos \theta}{g} \)
C. \( \frac{v_0 \sin \theta}{g^2} \)
D. \( \frac{v_0 \cos \theta}{g^2} \)
Question 9
A particle moves in a circular path with a cons\tant speed of 5 m/s. If the radius of the circle is 2 m, what is the magnitude of the acceleration of the particle?
A. 10 m/s^2
B. 20 m/s^2
C. 30 m/s^2
D. 40 m/s^2
Question 10
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, calculate the force experienced by the wire.
A. 0.5 N
B. 1 N
C. 2 N
D. 5 N
Question 11
A wave has a frequency of 50 Hz and a wavelength of 0.1 m. What is the speed of the wave?
A. 5 m/s
B. 10 m/s
C. 20 m/s
D. 50 m/s
Question 12
A sound wave with a frequency $f$ is traveling through a medium with a speed $v$. If the wavelength $\lambda$ of the sound wave is $10\,\text{m}$, what is the period $T$ of the sound wave?
A. \frac{v}{f}
B. \frac{\lambda}{v}
C. \frac{v}{\lambda}
D. \frac{f}{v}
Question 13
A particle of mass 2 kg is moving in a circular path of radius 4 m with a cons\tant speed of 6 m/s. Determine the magnitude of the force acting on the particle.
A. \( 12 , \text{N} \)
B. \( 15 , \text{N} \)
C. \( 18 , \text{N} \)
D. \( 20 , \text{N} \)
Question 14
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 acceleration?
A. 0.5 m/s^2
B. 1.0 m/s^2
C. 2.0 m/s^2
D. 4.0 m/s^2
Question 15
A light ray passes from air into a glass slab of re\fractive index 1.5. If the angle of incidence is 30°, what is the angle of re\fraction?
A. 20°
B. 30°
C. 40°
D. 50°

Master the Exam!

You've seen a preview, but there are thousands more questions plus AI tutor to break down complex solutions.

Unlock Full Access Available for Android & Windows
Help others prepare! Share this practice hub: