JEE Questions for Physics Waves Quiz 1 - MCQExams.com

The function sin2 (ω)t represents
  • A SHM with periodic time π/ω
  • A SHM with a periodic time 2π/ω
  • A periodic motion with periodic time π/ω
  • A periodic motion with periodic 2π/ω
A metallic wire of 1 m length has a mass of 10 × 10-3 kg. If a tension of 100 N is applied to a wire, what is the speed of transverse wave?
  • 100 ms-1
  • 10 ms-1
  • 200 ms-1
  • 0.1 ms-1
A wave represented by the equation y = a cos (kx - ωt) is superposed with another wave to form a stationary wave such that point x = 0 is a node. The equation for the other wave is
  • – a cos (kx + ωt)
  • a sin (kx + ωt)
  • – a cos (kx - ωt)
  • – a sin (kx - ωt)
Which quantity is transmitted with propagation of longitudinal waves through a medium?
  • Dispersion
  • Energy
  • Matter
  • Frequency
A string of mass 3 kg is under tension of 400 N. The length of the stretched string is 25 cm. If the transverse jerk is stuck at one end of the string, how long does the disturbance take to reach the other end?
  • 0.047 s
  • 0.055 s
  • 0.034 s
  • 0.065 s
A sonometer wire of length 1.5 m is made of steel. The tension in it produces an elastic strain of 1%. What is the fundamental frequency of steel if density and elasticity of steel are 7.7 × 103 kg / m3 and 2.2 × 1011 N / m2 respectively?
  • 188.5 Hz
  • 178.2 Hz
  • 200.5 Hz
  • 770 Hz
A string of density 7.5 g cm-3 and area of cross-section 0.2 mm2 is stretched under a tension of 20 N. When it is plucked at the mid-point, the speed of the transverse wave on the wire is
  • 116 ms-1
  • 40 ms-1
  • 200 ms-1
  • 80 ms-1

Physics-Waves-95965.png

  • Physics-Waves-95966.png
  • 2)
    Physics-Waves-95967.png

  • Physics-Waves-95968.png

  • Physics-Waves-95969.png
When two waves of nearly equal frequencies v1 and v2 are produced simultaneously, the time interval between successive maxima is

  • Physics-Waves-95970.png
  • 2)
    Physics-Waves-95971.png

  • Physics-Waves-95972.png

  • Physics-Waves-95973.png
Two Cu wires of radii R1 and R2, such that (R1 > R2 ). Then which of the following is true?
  • Transverse wave travels faster in thicker wire
  • Transverse wave travels faster in thinner wire
  • Travels with the same speed in both the wires
  • Does not travel
The frequency and velocity of sound wave are 600 Hz and 360 m/s respectively. Phase difference between two particles of medium are 60°, the minimum distance between these two particles will be
  • 10 cm
  • 15 cm
  • 20 cm
  • 50 cm
A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2m and 3m respectively from the source. The ratio of the intensities of the waves at P and Q is
  • 9 : 4
  • 2 : 3
  • 3 : 2
  • 4 : 9

Physics-Waves-95974.png
  • 5
  • 5√3
  • 10√3
  • 10
Sound waves transfer
  • only energy not momentum
  • energy
  • momentum
  • Both (a) and (b)
If the speed of a wave doubles as it passes from shallow water into deeper water, its wavelength will be
  • unchanged
  • halved
  • doubled
  • quadrupled
The angle between particle velocity and wave velocity in a transverse wave is
  • zero
  • π/4
  • π/2
  • π
A boat at anchor is rocked by waves whose crests are 100 m apart and velocity is 25 ms -1. The boat bounces up once in every
  • 2500 s
  • 75 s
  • 4 s
  • 0.25 s

Physics-Waves-95977.png
  • A node occurs at x = 0.15 m
  • An antinode occurs at x = 0.3 m
  • The speed wave is 5 ms–1
  • The wave length is 0.3 m
Compressional wave pulses are sent to the bottom of sea from a ship and the echo is heard after 2 s. If bulk modulus of elasticity of water is 2 × 109 Nm-2 and mean temperature is 4°C, then the depth of the sea will be
  • 1014 m
  • 1414 m
  • 2828 m
  • 1825 m
At a certain instant, a stationary transverse wave is found to have maximum kinetic energy. The appearance of string at that instant is
  • sinusoidal shape with amplitude a/3
  • sinusoidal shape with amplitude a/2
  • sinusoidal shape with amplitude a
  • straight line
If sound wave travel from air to water, which of the following remains unchanged?
  • Velocity
  • Wavelength
  • Requency
  • Intensity
Oxygen is 16 times heavier than hydrogen. Equal volumes of hydrogen and oxygen are mixed. The ratio of speed of sound in the mixture to that in hydrogen is

  • Physics-Waves-95978.png
  • 2)
    Physics-Waves-95979.png

  • Physics-Waves-95980.png

  • Physics-Waves-95981.png
A particle on the trough of a wave at any instant will come to the mean position after a time

  • Physics-Waves-95983.png
  • 2)
    Physics-Waves-95984.png

  • Physics-Waves-95985.png

  • Physics-Waves-95986.png
The ratio of velocity of sound in oxygen to that in hydrogen at same temperature and pressure is approximately
  • 16 : 1
  • 1 : 16
  • 4 : 1
  • 1 : 4
If vm is the velocity of sound in moist air, Vd is the velocity of sound in dry air, under identical conditions of pressure and temperature
  • vm < Vd
  • vm > Vd
  • vmVd = 1
  • vm = Vd
In sine wave, minimum distance between 2 particles having same speed, is always

  • Physics-Waves-95988.png
  • 2)
    Physics-Waves-95989.png

  • Physics-Waves-95990.png

  • Physics-Waves-95991.png
The extension in a string, obeying Hooke’s law, is x. The speed of sound in the stretched string is v. If the extension in the string is increased to 1.5x, the speed of sound will be
  • 1.22v
  • 0.61v
  • 1.50v
  • 0.75v
The equation of a simple harmonic wave is given by y = 6sin 2π (2t – 0.1x), where x and y are in mm and t is in second. The phase difference between two particles 2 mm apart at any instant is
  • 18°
  • 36°
  • 54°
  • 72°
If wave y = a cos (ωt + kx) is moving along X–axis, the shape of pulse at t = 0 and t = 2 s
  • are different
  • are same
  • may not be same
  • None of the above

Physics-Waves-95992.png
  • 0.04
  • 0.01
  • 1
  • 5
The period of a wave is 360 ms -1 and frequency is 500 Hz. Phase difference between two consecutive particles is 60°, then path difference between them will be
  • 0.72 cm
  • 120 cm
  • 12 cm
  • 7.2 cm
Two coherent monochromatic beams of intensities 4I and I respectively are superimposed. The maximum and minimum intensities in the resulting pattern are
  • 5I and 3I
  • 9I and 3I
  • 4I and I
  • 9I and I
Some of the frequencies of tones produced by an organ pipe are 220, 440, 550, 660 Hz. Find the effective length of the pipe. (take, the speed of sound in air = 330 m/s)
  • 1.8 m
  • 1.7 m
  • 1.5 m
  • 1.2 m
Intensity level of sound whose intensity is 10-8 Wm-2 is
  • 80 dB
  • 8 dB
  • 4 dB
  • 40 dB
When two sinusoidal waves moving at right angles to each other superimpose, they produce
  • beats
  • interference
  • stationary waves
  • Lissajous figure
A pulse of a wave train travels along a stretched string and reaches the fixed end of the string. It will be reflected with
  • a phase change of 180° with velocity reversed
  • the same phase as the incident pulse with no reversal of velocity
  • a phase change of 180° with no reversal of velocity
  • the same phase as the incident pulse but with velocity reversed
The intensity ratio of two waves is 1 : 9. The ratio of their amplitudes, is
  • 3 : 1
  • 1 : 3
  • 1 : 9
  • 9 : 1
Two progressive waves having equation x1 = 3 sin ωt and x2 = 4 sin (ωt – 90° ) are superimposed. The amplitude of the resultant wave is
  • 5 unit
  • 1 unit
  • 3 unit
  • 4 unit
Two strings with mass per unit length of 9 gcm -1 and 25 gcm -I are joined together in series. The reflection coefficient for the vibration waves are

  • Physics-Waves-95995.png
  • 2)
    Physics-Waves-95996.png

  • Physics-Waves-95997.png

  • Physics-Waves-95998.png
A bus is moving with a velocity of 5 ms -1 towards a huge wall. The driver sounds a horn of frequency 165 Hz. If the speed of sound in air is 335 ms -1, the number of beats heard per second by a passenger on the bus will be
  • 6
  • 3
  • 5
  • 4
Two tuning forks, A and B produce notes of frequencies 258 Hz and 262 Hz. An unknown note sounded with a produces certain beats. When the same note is sounded with B, the beat frequency gets doubled, The unknown frequency is
  • 256 Hz
  • 254 Hz
  • 300 Hz
  • 280 Hz
Two strings A and B are slightly out tune and produces beats of frequency 5 Hz. Increasing the tension in B, reduces the beat frequency to 3 Hz. If the frequency of string A is 450 Hz, calculate the frequency of string B.
  • 460 Hz
  • 455 Hz
  • 445 Hz
  • 440 Hz
Two vibrating tuning forks produce progressive waves given by y1 = 4 sin 500πt and y2 = 2sin 506πt. Number of beats produced per minute is
  • 360
  • 180
  • 3
  • 60
Three sound waves of equal amplitudes have frequencies (v –1), v, (v + 1). They superimpose to give beat. The number of beats produced per second will be
  • 4
  • 3
  • 2
  • 1
A tuning fork produces 4 beats/s when sounded with a sonometer wire of vibrating length 48 cm. It produces 4 beats/s also when the vibrating length is 50 cm. What is the frequency of the tuning fork?
  • 196 Hz
  • 284 Hz
  • 375 Hz
  • 460 Hz
Find beat frequency? Motion of two particles is given by y1 = 0.25 sin (310t) and y2 = 0.25 sin (316t)
  • 3
  • 2)
    Physics-Waves-96001.png

  • Physics-Waves-96002.png
  • 6
Two waves of wavelength 1.00 m and 1.01 m produces 10 beats in 3 s. What is the velocity of the wave?
  • 150 ms-1
  • 115.2 ms-1
  • 336.6 ms-1
  • 200 ms-1
Choose the correct statement.
  • Beats are due to destructive interference
  • Maximum beat frequency audible to a human being is 20
  • Beats are as a result of Doppler's effect
  • Beats are due to superposition of two waves of nearly equal frequencies
Three sources of equal intensities with frequencies 400, 401 and 402 vib/s are sounded together. The number of beats is
  • zero
  • 1
  • 2
  • 4
A pipe of length 85 cm is closed from one end. Find the number of possible natural oscillations of air column in the pipe whose frequencies lie below 1250 Hz. The velocity of sound in air is 340 m/s.
  • 12
  • 8
  • 6
  • 4
0:0:1


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