JEE Questions for Physics Waves Quiz 9 - MCQExams.com

Which of the following is not the transverse wave?
  • X–rays
  • γ–rays
  • Visible light wave
  • Sound wave in a gas
When an aeroplane attains a speed higher than the velocity of sound in air, a loud bang is heard. This is because
  • It explodes
  • It produces a shock wave which is received as the bang
  • Its wings vibrate so violently that the bang is heard
  • The normal engine noises undergo a Doppler shift to generate the bang

Physics-Waves-96568.png

  • Physics-Waves-96569.png
  • 2)
    Physics-Waves-96570.png

  • Physics-Waves-96571.png

  • Physics-Waves-96572.png
Ultrasonic waves are those waves
  • To which man can hear
  • Man can't hear
  • Are of high velocity
  • Of high amplitude
Sound waves of wavelength greater than that of audible sound are called
  • Seismic waves
  • Sonic waves
  • Ultrasonic waves
  • Infrasonic waves
\'SONAR\' emits which of the following waves ?
  • Radio waves
  • Ultrasonic waves
  • Light waves
  • Magnetic waves
Consider the following
I. Waves created on the surfaces of a water pond by a vibrating sources.
II. Wave created by an oscillating electric field in air.
III. Sound waves travelling under water.
Which of these can be polarized ?
  • I and II
  • II only
  • II and III
  • I, II and III
Mechanical waves on the surface of a liquid are
  • Transverse
  • Longitudinal
  • Torsional
  • Both transverse and longitudinal
The ratio of densities of nitrogen and oxygen is 14:16. The temperature at which the speed of sound in nitrogen will be same at that in oxygen at 55°C is
  • 35°C
  • 48°C
  • 65°C
  • 14°C
A wavelength 0.60 cm is produced in air and it travels at a speed of 300 ms–1. It will be an
  • Audible wave
  • Infrasonic wave
  • Ultrasonic wave
  • None of these
A micro-wave and an ultrasonic sound wave have the same wavelength. Their frequencies are in the ratio (approximately)
  • 106 : 1
  • 104 : 1
  • 102 : 1
  • 10 : 1
A wave has velocity u in medium P and velocity 2u in medium Q. If the wave is incident in medium P at an angle of 30°, then the angle of refraction will be
  • 30°
  • 45°
  • 60°
  • 90°
An observer standing near the sea shore observes 54 waves per minute. If the wavelength of the water wave is 10m then the velocity of water wave is
  • 540 ms–1
  • 5.4 ms–1
  • 0.184 ms–1
  • 9 ms–1
If the frequency of human heart beat is 1.25 Hz, the number of heart beats in 1 minute is
  • 80
  • 65
  • 90
  • 75
The speed of sound in a gas of density ρ at a pressure P is proportional to

  • Physics-Waves-96455.png
  • 2)
    Physics-Waves-96456.png

  • Physics-Waves-96457.png

  • Physics-Waves-96458.png
A progressive wave y = A sin (kx – ωt) is reflected by a rigid wall at x = 0. Then the reflected wave can be represented by
  • y = A sin (kx + ωt)
  • y = A cos (kx + ωt)
  • y = – A sin (kx – ωt)
  • y = – A sin (kx + ωt)

Physics-Waves-96461.png
  • 4 cm
  • 8 cm
  • 25 cm
  • 12.5 cm
A travelling wave passes a point of observation. At this point, the time interval between successive crests is 0.2 sec and
  • The wavelength is 5 m
  • The frequency is 5 Hz
  • The velocity of propagation is 5 m/s
  • The wavelength is 0.2 m

Physics-Waves-96464.png
  • 10 sec–1
  • 2 sec–1
  • 1 sec–1
  • 0.01 sec–1
A wave travelling along the x-axis is described by the equation y (x, t) = 0.005 cos (α x – βt). If the wavelength and the time period of the wave are 0.08 m and 2.0 s, respectively, then α and β in appropriate units are

  • Physics-Waves-96466.png
  • 2)
    Physics-Waves-96467.png

  • Physics-Waves-96468.png

  • Physics-Waves-96469.png

Physics-Waves-96471.png
  • 64 cm/sec in – x direction
  • 32 cm/sec in – x direction
  • 32 cm/sec in + x direction
  • 64 cm/sec in + x direction
Two waves are given by y1 = a sin (ωt – kx) and y2 = a cos (ωt – kx). The phase difference between the two waves is
  • π/4
  • π
  • π /8
  • π /2
If amplitude of waves at distance r from a point source is A, the amplitude at a distance 2r will be
  • 2A
  • A
  • A/2
  • A/4
The relation between time and displacement for two particles is given by
y1 = 0.06 sin 2π (0.04t + ɸ1 ),
y2 = 0.03 sin 2π (1.04 t + ɸ2)
The ratio of the intensity of the waves produced by the vibrations of the two particles will be
  • 2 : 1
  • 1 : 2
  • 4 : 1
  • 1 : 4
A plane wave is represented by x = 1.2 sin (314 t + 12.56 y )
Where x and y are distances measured along in x and y direction in meters and t is time in seconds. This wave has
  • A wavelength of 0.25 m and travels in + ve x direction
  • A wavelength of 0.25 m and travels in + ve y direction
  • A wavelength of 0.5 m and travels in – ve y direction
  • A wavelength of 0.5 m and travels in – ve x direction

Physics-Waves-96477.png
  • 10–3 sec and 330 m/sec
  • 10–4 sec and 20 m/sec
  • 103 sec and 200 m/sec
  • 10–2 sec and 2000 m/sec
A wave motion is described by y (x, t) = a sin (kx – ωt). Then the ratio of the maximum particle velocity to the wave velocity is

  • Physics-Waves-96479.png
  • 2)
    Physics-Waves-96480.png

  • Physics-Waves-96481.png

  • Physics-Waves-96482.png
A transverse wave of amplitude 0.5 m and wavelength 1 m and frequency 2 Hz is propagating in a string in the negative x-direction. The expression for this wave is
  • y (x, t) = 0.5 sin (2πx – 4πt)
  • y (x, t) = 0.5 cos (2πx + 4πt)
  • y (x, t) = 0.5 sin (πx – 2πt)
  • y (x, t) = 0.5 cos (2πx + 2πt)
When a wave travels in a medium, the particle displacement is given by the equation y = a sin 2π (bt – cx) where a, b and c are constants. The maximum particle velocity will be twice the wave velocity if

  • Physics-Waves-96484.png
  • 2)
    Physics-Waves-96485.png

  • Physics-Waves-96486.png

  • Physics-Waves-96487.png

Physics-Waves-96489.png
  • π/4
  • π
  • π /3
  • π /2
When a longitudinal wave propagates through a medium, the particles of the medium execute simple harmonic oscillations about their mean positions. These oscillations of a particle are characterized by an invariant
  • Kinetic energy
  • Potential energy
  • Sum of kinetic energy and potential energy
  • Difference between kinetic energy and potential energy

Physics-Waves-96491.png

  • Physics-Waves-96492.png
  • 2)
    Physics-Waves-96493.png

  • Physics-Waves-96494.png

  • Physics-Waves-96495.png
Wave equations of two particles are given by y1= a sin (ωt – kx), y2 = a sin (kx + ωt), then
  • They are moving in opposite direction
  • Phase between them is 90°
  • Phase between them is 180°
  • Phase between them is 0°
A wave is represented by the equation y = 0.5 sin (10 t – x) m. It is a travelling wave propagating along the +x direction with velocity
  • 10 m/s
  • 20 m/s
  • 5 m/s
  • None of these
A transverse progressive wave on a stretched string has a velocity of 10 ms–1 and a frequency of 100 Hz. The phase difference between two particles of the string which are 2.5 cm apart will be
  • π/8
  • π/ 4
  • 3 π/8
  • π/2
A travelling wave in a stretched string is described by the equation y = A sin (kx – ωt). The maximum particle velocity is
  • Aω
  • ω/k
  • dω/dk
  • x/t
The particles of a medium vibrate about their mean positions whenever a wave travels through that medium. The phase difference between the vibrations of two such particles
  • Varies with time
  • Varies with distance separating them
  • Varies with time as well as distance
  • Is always zero

Physics-Waves-96500.png
  • 100 Hz, 4.7 × 103 cm/s2
  • 50 Hz, 7.5 × 103 cm/s2
  • 25 Hz, 4.7 × 104 cm/s2
  • 25 Hz, 7.4 × 104 cm/s2

Physics-Waves-96502.png
  • v = 5 m/sec
  • λ = 18 m
  • a = 0.04 m
  • n = 50 Hz
With the propagation of a longitudinal wave through a material medium, the quantities transmitted in the propagation direction are
  • Energy, momentum and mass
  • Energy
  • Energy and mass
  • Energy and linear momentum
The frequency of the sinusoidal wave y = 0.40 cos [2000 t + 0.80 x] would be
  • 1000 π Hz
  • 2000 Hz
  • 20 Hz

  • Physics-Waves-96504.png

Physics-Waves-96506.png
  • 8
  • 16
  • 2
  • 4
At what speed should a source of sound move so that stationary observer finds the apparent frequency equal to half of the original frequency?
  • v/2
  • 2v
  • v/4
  • v
A pulse or a wave train travels along a stretched string and reaches the fixed end of the string. It will be reflected back with
  • The same phase as the incident pulse but with velocity reversed
  • A phase change of 180° with no reversal of velocity
  • The same phase as the incident pulse with no reversal of velocity
  • A phase change of 180° with velocity reversed
Two waves of frequencies 20 Hz and 30 Hz travels out from a common point. The phase difference between them after 0.6 sec is
  • Zero
  • 2)
    Physics-Waves-96508.png
  • π

  • Physics-Waves-96509.png

Physics-Waves-96511.png
  • 100 Hz, 1.7 m , 170 m/s
  • 150 Hz, 2.4 m , 200 m/s
  • 80 Hz, 1.1 m , 90 m/s
  • 120 Hz, 1.25 m , 207 m/s

Physics-Waves-96513.png
  • 60 cm
  • 40 cm
  • 35 cm
  • 25 cm
The phase difference between two points separated by 0.8 m in a wave of frequency is 120 Hz is π2. The velocity of wave is
  • 720 m/s
  • 384 m/s
  • 250 m/s
  • 1 m/s
If the equation of transverse wave is y = 2 sin (kx – 2x)), then the maximum particle velocity is
  • 4 units
  • 2 units
  • 0
  • 6 units
A particle on the trough of a wave at any instant will come to the mean position after a time (T = time period)
  • T/2
  • T/4
  • T
  • 2T
0:0:1


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