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Waves

49 questions · Physics · NEET
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Waves

49 questions · Physics · NEET

  1. A pipe open at both ends has a fundamental frequency f in air. The pipe is now dipped vertically in a water drum to half of its length. The fundamental frequency of the air column is now equal to:2025 · Q158 · MCQ
  2. The displacement of a travelling wave y=Csinλ2π​ (at −x) where t is time, x is distance and λ is the wavelength, all in S.I. units. Then the frequency of the wave is2024 · Q188 · MCQ
  3. The 4th  overtone of a closed organ pipe is same as that of 3rd  overtone of an open pipe. The ratio of the length of the closed pipe to the length of the open pipe is :2023 · Q143 · MCQ
  4. The ratio of frequencies of fundamental harmonic produced by an open pipe to that of closed pipe having the same length is2023 · Q134 · MCQ
  5. An organ pipe filled with a gas at 27∘C resonates at 400 Hz in its fundamental mode. If it is filled with the same gas at 90∘C, the resonance frequency at the same mode will be2022 · Q182 · MCQ
  6. If the initial tension on a stretched string is doubled, then the ratio of the initial and final speeds of a transverse wave along the string is2022 · Q135 · MCQ
  7. In a guitar, two strings A and B made of same material are slightly out of tune and produce beats of frequency 6 Hz. When tension in B is slightly decreased, the beat frequency of A is 530 Hz, the original freqnency of B will be :2020 · Q142 · MCQ
  8. The fundamental frequency in an open organ pipe is equal to the third harmonic of a closed organ pipe. If the length of the closed organ pipe is 20 cm, the length of the open organ pipe is2018 · Q154 · MCQ
  9. A tuning fork is used to produce resonance in a glass tube. The length of the air column in this tube can be adjusted by a variable piston. At room temperature of 27°C two successive resonances are produced at 20 cm and 73 cm of column…2018 · Q155 · MCQ
  10. The two nearest harmonics of a tube closed at one end and open at other end are 220 Hz and 260 Hz. What is the fundamental frequency of the system ?2017 · Q163 · MCQ
  11. An air column, closed at one end open at the other, resonates with a tuning fork when the smallest length of the column is 50 cm. The next larger length of the column resonating with the same tuning fork is2016 · Q158 · MCQ
  12. A uniform rope of length L and mass m1 hangs vertically from a rigid support. A block of mass m2 is attached to the free end of the rope. A transverse pulse of wavelength λ1 is produced at the lower end of the rope. The wavelength…2016 · Q159 · MCQ
  13. The second overtone of an open organ pipe has the same frquency as the first overtone of a closed pipe L metre long. The length of the open pipe will be2016 · Q159 · MCQ
  14. Three sound waves of equal amplitudes have frequencies (n − 1), n, (n + 1). They superimpose to give beats. The number of beats produced per second will be2016 · Q160 · MCQ
  15. A string is stretched between fixed points separated by 75.0 cm. It is observed to have resonant frequencies of 420 Hz and 315 Hz. There are no other resonant frequencies between these two. The lowest resonant frequency for this string is2015 · Q108 · MCQ
  16. 4.0 g of a gas occupies 22.4 litres at NTP. The specific heat capacity of the gas at constant volume is 5.0 J K−1 mol−1. If the speed of sound in this gas at NTP is 952 m s−1, then the heat capacity at constant pressure is (Take gas…2015 · Q109 · MCQ
  17. The fundamental frequency of a closed organ pipe of length 20 cm is equal to the second overtone of an organ pipe open at both the ends. The length of organ pipe open at both the ends is2015 · Q110 · MCQ
  18. If n1, n2 and n3 are the fundamental frequencies of three segments into which a string is divided, then the original fundamental frequency n of the string is given by2014 · Q158 · MCQ
  19. The number of possible natural oscillations of air column in a pipe closed at one end length 85 cm whose frequencies lie below 1250 Hz are (Velocity of sound = 340 m s−1)2014 · Q159 · MCQ
  20. The length of the wire between two ends of a sonometer is 100 cm. What should be the positions of two bridges below the wire so that the three segments of the wire have their fundamental frequencies in the ratio 1 : 3 : 5.2013 · Q163 · MCQ
  21. If we study the vibration of a pipe open at both ends. then the following statement is not true.2013 · Q159 · MCQ
  22. A wave travelling in the + ve x-direction having displacement along y-direction as 1 m, wavelength 2π m and frequency of π1​ Hz is represented by2013 · Q160 · MCQ
  23. A source of unknown frequency gives 4 beats/s when sounded with a source of known frquency 250 Hz. The second harmonic of the source of unknown frequency gives five beats per second, when sounded with a source of frequency 513 Hz. The…2013 · Q161 · MCQ
  24. The equation of a simple harmonic wave is given by y = 3 sin2π​(50t − x), where x and y are in metres and t is in seconds. The ratio of maximum particle velocity to the wave velocity is2012 · Q96 · MCQ
  25. When a string is divided into three segments of length l1, l2 and l3 the fundamental frequencies of these three segments are υ1​,υ2​ and υ3​ respectively. The original fundamental frequency (v)…2012 · Q169 · MCQ
  26. Two sources of sound placed close to each other, are emitting progressive waves given by y1 = 4sin600πt and y2 = 5sin608πt An observer located near these two sources of sound will hear2012 · Q170 · MCQ
  27. Two identical piano wires, kept under the same tension T have a fundamental frequency of 600 Hz. The fractional increase in the tension of one of the wires which will lead to occurrence of 6 beats/s when both the wires oscillate together…2011 · Q98 · MCQ
  28. Two waves are represented by the equations y1 = asin(ωt + kx + 0.57) m and y2 = acos(ωt + kx) m, where x is in meter and t in sec. The phase difference between them is2011 · Q160 · MCQ
  29. Sound waves travel at 350 m/s through a warm air and at 3500 m/s through brass. The wavelength of a 700 Hz acoustic wave as it enters brass from warm air2011 · Q161 · MCQ
  30. A transverse wave is represented by y = Asin(ωt − kx). For what value of the wavelength is the wave velocity equal to the maximum particle velocity ?2010 · Q183 · MCQ
  31. A tuning fork of frequency 512 Hz makes 4 beats per second with the vibrating string of a piano. The beat frequency decreases to 2 beats per sec when the tension in the piano string is slightly increased. The frequency of the piano string…2010 · Q184 · MCQ
  32. Each of the two strings of length 51.6 cm and 49.1 cm are tensioned separately by 20 N force. Mass per unit length of both the strings is same and equal to 1 g/m. When both the strings vibrate simultaneously the number of beats is2009 · Q171 · MCQ
  33. A wave in a string has an amplitude of 2 cm. The wave travels in the +ve direction of x axis with a speed of 128 m/s. and it is noted that 5 complete waves fit in 4m length of the string. The equation describing the wave is2009 · Q172 · MCQ
  34. A point performs simple harmonic oscillation of period T and the equation of motion is given by x = a sin(ωt + π/6). After the elapse of what fraction of the time period the velocity of the point will be equal to half of its…2008 · Q161 · MCQ
  35. Two periodic waves of intensities I1 and I2 pass through a region at the same time in the same direction. The sum of the maximum and minimum intensities is2008 · Q162 · MCQ
  36. The wave described by y = 0.25 sin(10πx − 2πt), where x and y are in metres and t in seconds, is a wave travelling along the2008 · Q163 · MCQ
  37. Two vibrating tuning forks produce waves given by y1 = 4 sin 500πt and y2 = 2 sin506 πt. Number of beats produced per minute is2006 · Q168 · MCQ
  38. Two sound waves with wavelengths 5.0 m and 5.5. m respectively, each propagate in a gas with velocity 330 m/s. We expect the following number of beats per second.2006 · Q169 · MCQ
  39. The time of reverberation of a room A is one second. What will be the time (in seconds of reverberation of a room, having all the dimensions double of those of room A ?2006 · Q170 · MCQ
  40. A transverse wave propagating along x-axis is represented by y(x, t) = 8.0 sin (0.5 πx − 4πt − π/4) where x is in metres and t is in seconds. The speed of the wave is2006 · Q171 · MCQ
  41. Which one of the following statements is true ?2006 · Q172 · MCQ
  42. A point source emits sound equally in all directions in a non-absorbing medium. Two points P and Q are at distances of 2 m and 3 m respectively from the source. The ratio of the intensities of the waves at P and Q is2005 · Q169 · MCQ
  43. The phase difference between two waves. represented by y1 = 10−6 sin[100t + (x/50) + 0.5] m y2 = 10−6 cos[100t + (x/50)] m, where x is expressed in metres and t is exressed in secondss, is approximately.2004 · Q158 · MCQ
  44. A wave travelling in positive X-direction with a = 0.2 ms−2, velocity = 360 ms−1 and λ = 60 m, then correct expression for the wave is2002 · Q170 · MCQ
  45. Two waves having equation x1 = asin(ωt − kx + ϕ1), x2 = asin(ωt −kx + ϕ2). If in the resultant wave the frequency and amplitude remain equal to amplitude of superimposing waves, the phase difference…2001 · Q164 · MCQ
  46. The equation of a wave is represented by y = 10−4 sin(100t − 10x​) m. then the velocity of wave will be2001 · Q165 · MCQ
  47. If the tension and diameter of a sonometer wire of fundamental frequency n is doubled and density is halved then its fundamental frequency will become2001 · Q166 · MCQ
  48. The equations of two waves acting in perpendicular directions are given as x = acos(ωt +δ) and y = acos(ωt + α), where δ = α + 2π​, the resultant wave represents2000 · Q163 · MCQ
  49. A string is cut into three parts, having fundamental frequencies n1, n2, n3 respectively. Then original fundamental frequency n related by the expression as2000 · Q164 · MCQ