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CBSE Questions for Class 11 Engineering Physics Waves Quiz 3 - MCQExams.com

The relation between frequency υ, wavelength λ and velocity of propagation of wave ν is
  • υ=λν
  • υ=λν
  • υ=νλ
  • None of these
Two identical sinusoidal waves each of amplitude 10mm with a phase difference of 90o are travelling in the same direction in string. The amplitude of the resultant wave is :
  • 5mm
  • 102mm
  • 15mm
  • 20mm
Which of the following waves is udsed in sonography?
  • Radio waves
  • X-rays
  • Ultrasonic waves
  • Gamma rays
Which of the following waves does not travel in vacuum?
  • Seismic waves
  • X-rays
  • Light
  • Radio waves
Ultrasonic waves produced by a vibrating quartz crystal are:
  • only longitudinal
  • only transverse
  • both longitudinal and transverse
  • neither longitudinal nor transverse
Regarding open organ pipe, which of following is correct?
  • Both ends are pressure antinodes
  • Both ends are displacement nodes
  • Both ends are pressure nodes
  • Both (1)and (2)
A simple harmoinic motion is represented by F(t)=10sin(10τ+0.5). The amplitude of the S.H.M. is
  • a=30
  • a=20
  • a=10
  • a=5
In the equation y=Asin(kxωt+ϕ0) the term phase is defined as:
  • ϕ0
  • ϕ0ωt
  • kx+ϕ0
  • kxωtϕ0
Displacement time equation of a particle executing SHM is x = A sin(wt + /6). Time taken by the particle to go directly from x = - A/2  to x = +A/2 is
  • π/ω
  • π/3ω
  • 3π/ω
  • π/2ω
The equation of a simple harmonic motion is given by, x=8sin(8πt)+6cos(8πt), the initial phase angle is 
  • tan1(4/3)
  • tan1(3/4)
  • tan1(2/3)
  • tan1(5/8)
Two wave have amplitude ratio 10 : 1 then v1/v2 is (Approx) - 
  • 10 : 1
  • 1 : 10
  • 2 : 3
  • 3 : 2
A particle starts oscillating from position equal to half the amplitude. What is its initial phase?
  • π/6
  • π/3
  • zero
  • none of these
A single wave is called
  • a wave pulse
  • a crest
  • a trough
  • a crest and a trough
A particle is executing SHM with an amplitude 4 cm. What time does it take to reach the distance equal to amplitude, if the particle starts from rest at t = 0 from the mean position
  • T
  • T/2
  • T/4
  • 3T/4
Phase of a particle gives us
  • the velocity of the particle
  • the direction of motion of the particle
  • the acceleration of the particle
  • the displacement of the particle
Which of the following functions represent a wave 
  • (xvt)2
  • log(x+vt)
  • e(xvt)2
  • 1x+vt
The equation of a wave traveling in a string can be written as y=3sinπ(100tx)cm. Its wavelength is:
  • 3 cm
  • 100 cm
  • 5 cm
  • 2 cm
Three waves y1=2Asin(ωtπ3)  y2=2Asin(ωt+π3) and y3=Asin(ωt) interfere each other. The amplitude of the resultant wave is
  • A
  • zero
  • 2 A
  • 3 A
If two waves of same frequency and amplitude superpose to produce resultant of the amplitude of either wave, then their phase difference is- 
  • π
  • 2π/3
  • π/3
  • Zero
The motion of a particle is said to be simple harmonic 
It it moves to and fro about a fixed point  and given that driving force is towards mean position
  • True
  • False
The phase difference between the displacement and acceleration of particle executing S.H.M. radian is:
  • \pi / 4
  • \pi / 2
  • \pi
  • 2 \pi
The displacement of a particle executing SMH is given by x=0.01{\,\,}sin{\,\,}100\pi(t+0.05). The time period is
  • 0.01sec
  • 0.02sec
  • 0.1sec
  • 0.2sec
The two waves represented by y=a \sin (\omega t) and y_2=b \cos (\omega t) have a phase difference of
  • 0
  • \dfrac{\pi}{2}
  • \pi
  • \dfrac{\pi}{4}
The displacement of a particle is given byx = 3 sin(5\pi t) + 4 cos 5(5 \pi t) The amplitude of the particle is [MP PMT 1999]
  • 3
  • 4
  • 5
  • 7
The frequency of light ray having the wavelength 3000\ A^o is
  • 9 \times 10^{13}\ cycles/sec
  • 10^{15}\ cycles/sec
  • 90 \ cycles/sec
  • 3000 \ cycles/sec
A water wave in a shallow tank passes through a gap in a barrier. What happens to the speed and what happens to the wavelength of the wave as it passes through the gap?
1647118_2762724253204411a27b4961fa66174f.png
  • speed - decreases ; wavelength - decreases
  • speed - decreases ; wavelength - remains constant
  • speed - remains constant ; wavelength - decreases
  • speed - remains constant ; wavelength - remains constant
Wavelength of light of frequency 100\ Hz
  • 2 \times 10^6\ m
  • 3 \times 10^6\ m
  • 4 \times 10^6\ m
  • 5 \times 10^6\ m
In how many parts radio wave frequency is divided 
  • 2
  • 3
  • 4
  • 5
A source of sound of frequency 600 Hz is placed inside water. The speed in water is 1500 m/s and in air it is 300 m/s. The frequency of sound recorded by an observer standing in air is
  • 200 Hz
  • 3000 Hz
  • 120 Hz
  • 600 Hz
The principle of  superposition of waves can not be used to explain wave phenomena like
  • Interference
  • Diffraction
  • Stationary Waves and beats
  • Dispersion
Transverse waves are produced in a long string by attaching its free end to a vibrating tuning fork. Figure shows the shape of a part of the string. The points in phase are

6594.jpg
  • A and D
  • B and E
  • C and F
  • A and G
Human audible frequency range is 20Hz to 20KHz.  If velocity of sound in air is 340m/s, the minimum wavelength of audible sound wave is
  • 0.17mm
  • 1.77mm
  • 17mm
  • 170mm
Two light waves are represented by y_{1} =3\sin\omega t and y_{2}=4\sin( \omega t+\dfrac{\pi }{3} ). The resultant amplitude due to interference will be
  • \sqrt{21}
  • \sqrt{26}
  • \sqrt{37}
  • \sqrt{41}
During propagation of longitudinal plane wave in a medium, two particles separated by a distance equivalent to one wavelength at an instant will be/have
  • In phase, same displacement
  • In phase, different displacement
  • Different phase, same displacement
  • Different phase, different displacement
A plane progressive wave has frequency 25 \ Hz and amplitude 2.5 \times 10^{-5} m and initial phase zero, propagates along the negative x-direction with a velocity of 300 m/s. The phase difference between the oscillations at two points 6m apart along the line of propagation is :
  • \pi
  • \displaystyle \dfrac{\pi}{2}
  • 2\pi
  • \displaystyle \dfrac{\pi}{4}
The equations of displacement of two waves are given as Y_{1}=10 \sin(\pi t+\pi /3) Y_{2}=5(\sin3\pi t +\sqrt{3}\cos3\pi t), then the ratio of their amplitude is 
  • 1:2
  • 2:1
  • 1:1
  • 3:1
The frequency of vibration of a rod is 200Hz. If the velocity of sound in air is 340m/s, the wave length of the sound produced is 
  • 1.7m
  • 6.8 m
  • 3.4 m
  • 13.6 m
Mark correct option:
  • the phase of transmitted wave always remains unchanged
  • the amplitude of transmitted wave does not depend upon the velocity of wave in media
  • the amplitude of reflected wave and transmitted wave are same to each other for a given incident wave
  • the amplitude of rerflected wave is equal to the amplitude of incident wave
Three waves of equal frequency having amplitudes 10 \ mm, 4 \ mm and 7\ mm arrive at a given point with successive phase difference \dfrac \pi  2. The amplitude of the resulting wave (in mm) is given by:
  • 7
  • 6
  • 5
  • 4
When a transverse plane wave traverses a medium, individual particles execute periodic motion given by the equation  y=0.25\cos(2\pi t-\pi x). The phase difference for two positions of same particle which are occupied by time intervals 0.4 second apart is
  • 144^{o}
  • 135^{o}
  • 72^{o}
  • 108^{o}
The equation of a wave pulse is given as y=\displaystyle \frac{0.8}{(4x+5t)+4}, the amplitude of the pulse is:
  • 0.2 \ units
  • 0.4\  units
  • 0.6 \ units
  • 0.8 \ units
The displacement of a particle varies according to the relation X=4(\cos\pi t+\sin\pi t)
The amplitude of the particle is
  • -4
  • 4
  • 4\sqrt{2}
  • 8
A Sound wave with an amplitude of 3 cm  starts moving towards right from origin and gets reflected at a rigid wall after a second. If  the velocity of the wave is 340 ms^{-1} and it has a wavelength of 2 m, the equations of incident and reflected waves are
  • y = 3\times 10^{-2}\sin \pi (340 t - x), y = -3\times 10^{-2}\sin\pi(340t + x) towards left
  • y = 4\times 10^{-2} \sin \pi (340 t + x), y = -4\times 10^{-2}\sin\pi(340t + x) towards left
  • y = 5\times 10^{-2} \sin \pi (340 t - x), y = -5\times 10^{-2}\sin\pi(340t - x) towards left
  • y = 6\times10^{-2}\sin \pi(340 t - x), y = -6\times 10^{-2}\sin\pi(340t + x) towards left
A man is travelling towards east at 20ms^{-1} and sound waves are moving towards east at 340ms^{-1}. He finds that 500 waves cross him in 2 seconds, the wavelength of the sound wave received by the man is :
  • 1.28 m
  • 2.28 m
  • 3.28 m
  • 4.28 m
The equation y=4+2\sin(6t-3x) represents a wave motion with amplitude of
  • 6 units
  • 2 units
  • 20 units
  • 8 units
The equation of a wave travelling on a stretched string is  y=4\displaystyle \sin 2\pi(\frac{t}{0.02}-\frac{x}{100})  here x, y are in cm and t in seconds. The relative deformation amplitude of medium is
  • 0.02\pi
  • 0.08\pi
  • 0.06\pi
  • 0.01\pi
A wave of length 2m is superposed on its reflected wave to form a stationary wave. A node is located at   x=3m The next node will be located at  x=
  • 4m
  • 3.75m
  • 3.50m
  • 3.25m
The equation of a plane progressive wave is y = 0.9 \sin 4\pi [t-\displaystyle \dfrac{x}{2}] , when it is reflected at a rigid support, its amplitude becomes 2/3  of its previous value. The equation
of the reflected wave is :
  • y=0.9\displaystyle \sin 4\pi[t+\dfrac{x}{2}]
  • y=-0.6\displaystyle \sin 4\pi[t+\dfrac{x}{2}]
  • {y}=0.9\displaystyle \sin 8\pi[t-\dfrac{x}{2}]
  • {y}=0.6\displaystyle \sin 4\pi[t+\dfrac{x}{2}]
The equation of a progressive wave is y = 0.5 \sin \ 2\pi (\dfrac{t}{0.004} - \dfrac{x}{50}), where x is in cm. The phase difference between two points separated by a distance 5 \ cm at any instant is :
  • \dfrac \pi 5
  • \dfrac \pi 3
  • \dfrac \pi 2
  • \pi
In a stationary wave that forms as a result of reflection of waves from an obstacle, the ratio of the amplitude at an antinode to the amplitude at node is 6. The percentage of energy transmitted is 
  • 25\%
  • 49\%
  • 58\%
  • 72\%
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