{"id":12646,"date":"2025-09-20T05:43:22","date_gmt":"2025-09-20T04:43:22","guid":{"rendered":"https:\/\/mcqsadda.com\/?p=12646"},"modified":"2025-10-22T09:47:38","modified_gmt":"2025-10-22T08:47:38","slug":"wave-top-100-mcqs-with-answer-and-explanation","status":"publish","type":"post","link":"https:\/\/mcqsadda.com\/index.php\/2025\/09\/20\/wave-top-100-mcqs-with-answer-and-explanation\/","title":{"rendered":"Wave Top 100 MCQs With Answer and Explanation"},"content":{"rendered":"\n

1. A wave is a disturbance which:
<\/mark><\/strong>a) Transfers matter from one point to another
b) Transfers energy without transfer of matter
c) Transfers both matter and energy
d) Does not transfer energy
Answer:<\/strong> b
Explanation:<\/strong> In waves, energy propagates while the medium\u2019s particles only oscillate around equilibrium positions.<\/p>\n\n\n\n

2. The velocity of a wave is given by:
<\/mark><\/strong>a)
b)
c)
d)
Answer:<\/strong> a
Explanation:<\/strong> Wave velocity = wavelength \u00d7 frequency.<\/p>\n\n\n\n

3. Which of the following is a mechanical wave?<\/mark><\/strong>
a) Light
b) Sound
c) Radio wave
d) X-ray
Answer:<\/strong> b
Explanation:<\/strong> Sound needs a material medium for propagation, hence mechanical.<\/p>\n\n\n\n

4. Which of the following waves is longitudinal?
<\/mark><\/strong>a) Sound wave in air
b) Water wave
c) Light wave
d) Seismic S-wave
Answer:<\/strong> a
Explanation:<\/strong> In longitudinal waves, particles oscillate parallel to wave motion \u2192 sound is longitudinal.<\/p>\n\n\n\n

5. The SI unit of frequency is:
<\/mark><\/strong>a) Hertz
b) Joule
c) Watt
d) Pascal
Answer:<\/strong> a
Explanation:<\/strong> 1 Hertz = 1 oscillation per second.<\/p>\n\n\n\n

6. If a sound wave has a frequency of 500 Hz and wavelength of 0.68 m, its speed is:
<\/mark><\/strong>a) 170 m\/s
b) 340 m\/s
c) 500 m\/s
d) 680 m\/s
Answer:<\/strong> b
Explanation:<\/strong> m\/s.<\/p>\n\n\n\n

7. In transverse waves, the particle motion is:
<\/mark><\/strong>a) Parallel to wave motion
b) Perpendicular to wave motion
c) Random
d) Circular
Answer:<\/strong> b
Explanation:<\/strong> In transverse waves, oscillations are perpendicular to wave propagation.<\/p>\n\n\n\n

8. Sound cannot travel in:
<\/mark><\/strong>a) Solids
b) Liquids
c) Gases
d) Vacuum
Answer:<\/strong> d
Explanation:<\/strong> Sound needs a medium; cannot travel in vacuum.<\/p>\n\n\n\n

9. Which property of wave does not change when it enters another medium?
<\/mark><\/strong>a) Speed
b) Wavelength
c) Frequency
d) Amplitude
Answer:<\/strong> c
Explanation:<\/strong> Frequency is determined by the source and remains constant.<\/p>\n\n\n\n

10. The time taken for one complete oscillation is called:
<\/mark><\/strong>a) Wavelength
b) Frequency
c) Time period
d) Amplitude
Answer:<\/strong> c
Explanation:<\/strong> Time period is the reciprocal of frequency.<\/p>\n\n\n\n

11. The energy carried by a wave is proportional to:
<\/mark><\/strong>a) Frequency
b) Amplitude squared
c) Wavelength
d) Speed
Answer:<\/strong> b
Explanation:<\/strong> Wave energy \u221d .<\/p>\n\n\n\n

12. A wave has a frequency of 100 Hz and period of:
<\/mark><\/strong>a) 0.01 s
b) 0.1 s
c) 1 s
d) 10 s
Answer:<\/strong> a
Explanation:<\/strong> s.<\/p>\n\n\n\n

13. The point on a wave where displacement is maximum is called:
<\/mark><\/strong>a) Node
b) Antinode
c) Crest or trough
d) Wavelength
Answer:<\/strong> c
Explanation:<\/strong> Crest = maximum positive displacement; trough = maximum negative displacement.<\/p>\n\n\n\n

14. The distance between two consecutive crests is:
<\/mark><\/strong>a) Amplitude
b) Wavelength
c) Frequency
d) Period
Answer:<\/strong> b
Explanation:<\/strong> Wavelength = distance between successive identical points.<\/p>\n\n\n\n

15. Which type of wave can be polarized?
<\/mark><\/strong>a) Longitudinal wave
b) Transverse wave
c) Both
d) Neither
Answer:<\/strong> b
Explanation:<\/strong> Only transverse waves can be polarized.<\/p>\n\n\n\n

16. In a stationary wave, the displacement is always zero at:
<\/mark><\/strong>a) Antinode
b) Node
c) Crest
d) Trough
Answer:<\/strong> b
Explanation:<\/strong> Nodes are points of zero displacement.<\/p>\n\n\n\n

17. The wave equation is:
<\/mark><\/strong>a)
b)
c) Both (depending on wave direction)
d) Neither
Answer:<\/strong> c
Explanation:<\/strong> General wave equation can use \u00b1 depending on wave direction.<\/p>\n\n\n\n

18. The speed of sound in air at 20\u00b0C is approximately:
<\/mark><\/strong>a) 220 m\/s
b) 280 m\/s
c) 343 m\/s
d) 400 m\/s
Answer:<\/strong> c
Explanation:<\/strong> At 20\u00b0C, speed \u2248 343 m\/s.<\/p>\n\n\n\n

19. The ratio of speed of sound in solids, liquids, gases is generally:
<\/mark><\/strong>a) Gas > liquid > solid
b) Solid > liquid > gas
c) Liquid > solid > gas
d) Same in all
Answer:<\/strong> b
Explanation:<\/strong> Because solids are most rigid, sound travels fastest in solids.<\/p>\n\n\n\n

20. Which of the following is not a property of waves?
<\/mark><\/strong>a) Reflection
b) Refraction
c) Diffraction
d) Combustion
Answer:<\/strong> d
Explanation:<\/strong> Combustion is a chemical reaction, not a wave property.<\/p>\n\n\n\n

21. The loudness of sound depends on:
<\/mark><\/strong>a) Frequency
b) Amplitude
c) Wavelength
d) Speed
Answer:<\/strong> b
Explanation:<\/strong> Loudness \u221d amplitude of sound wave.<\/p>\n\n\n\n

22. The pitch of a sound depends on:
<\/mark><\/strong>a) Amplitude
b) Frequency
c) Wavelength
d) Speed
Answer:<\/strong> b
Explanation:<\/strong> Higher frequency \u2192 higher pitch.<\/p>\n\n\n\n

23. Which wave phenomenon explains sound heard around a corner?
<\/mark><\/strong>a) Reflection
b) Refraction
c) Diffraction
d) Polarization
Answer:<\/strong> c
Explanation:<\/strong> Diffraction is bending of waves around obstacles.<\/p>\n\n\n\n

24. The intensity of a wave is proportional to:
<\/mark><\/strong>a) Amplitude
b) Amplitude\u00b2
c) Frequency
d) Wavelength
Answer:<\/strong> b
Explanation:<\/strong> Intensity \u221d square of amplitude.<\/p>\n\n\n\n

25. The Doppler effect is the change in:
<\/mark><\/strong>a) Wavelength due to amplitude
b) Frequency due to relative motion of source and observer
c) Speed due to medium
d) Energy of sound
Answer:<\/strong> b
Explanation:<\/strong> Doppler effect = change in observed frequency due to relative motion.<\/p>\n\n\n\n

26. The equation of a progressive wave is <\/mark><\/strong>. Its wavelength is:
a) 1.57 m
b) 2 m
c) 3.14 m
d) 4 m
Answer:<\/strong> b
Explanation:<\/strong> Wave equation: . Wavelength m. Correct = a<\/strong>.<\/p>\n\n\n\n

27. The amplitude of resultant wave formed by superposition of two waves of same frequency and same amplitude is maximum when their phase difference is:
<\/mark><\/strong>a) 0\u00b0
b) 90\u00b0
c) 120\u00b0
d) 180\u00b0
Answer:<\/strong> a
Explanation:<\/strong> Maximum amplitude occurs when waves are in phase.<\/p>\n\n\n\n

28. The principle of superposition states that:
<\/mark><\/strong>a) Only one wave can exist in a medium
b) Resultant displacement is sum of individual displacements
c) Waves always cancel each other
d) Waves always reinforce each other
Answer:<\/strong> b
Explanation:<\/strong> Principle: net displacement = vector sum of individual displacements.<\/p>\n\n\n\n

29. Two sound waves of equal amplitude and slightly different frequencies interfere to produce:
<\/mark><\/strong>a) Beats
b) Echo
c) Resonance
d) Standing waves
Answer:<\/strong> a
Explanation:<\/strong> Beats occur due to superposition of close-frequency waves.<\/p>\n\n\n\n

30. A standing wave is formed due to:
<\/mark><\/strong>a) Interference of two waves of same amplitude and frequency traveling in opposite directions
b) Reflection of sound only
c) Random oscillations
d) Beats
Answer:<\/strong> a
Explanation:<\/strong> Opposite moving identical waves form stationary (standing) waves.<\/p>\n\n\n\n

31. In stationary waves, the points of zero displacement are called:
<\/mark><\/strong>a) Crests
b) Troughs
c) Nodes
d) Antinodes
Answer:<\/strong> c
Explanation:<\/strong> At nodes, displacement = 0.<\/p>\n\n\n\n

32. In stationary waves, maximum displacement occurs at:<\/mark><\/strong>
a) Node
b) Antinode
c) Midpoint
d) Everywhere
Answer:<\/strong> b
Explanation:<\/strong> Antinodes are points of maximum amplitude.<\/p>\n\n\n\n

33. The distance between two consecutive nodes in a stationary wave is:
<\/mark><\/strong>a)
b)
c)
d) 2
Answer:<\/strong> a
Explanation:<\/strong> Node\u2013node separation = half wavelength.<\/p>\n\n\n\n

34. The fundamental frequency of a string fixed at both ends is:
<\/mark><\/strong>a)
b)
c)
d)
Answer:<\/strong> a
Explanation:<\/strong> , where = speed of wave on string.<\/p>\n\n\n\n

35. In the fundamental mode of vibration of a closed organ pipe:
<\/mark><\/strong>a) Node at closed end, antinode at open end
b) Antinode at both ends
c) Node at both ends
d) Antinode at closed end, node at open end
Answer:<\/strong> a
Explanation:<\/strong> Closed end = displacement node, open end = displacement antinode.<\/p>\n\n\n\n

36. In stationary waves, the distance between node and antinode is:
<\/mark><\/strong>a)
b)
c)
d)
Answer:<\/strong> c
Explanation:<\/strong> Node\u2013antinode separation = quarter wavelength.<\/p>\n\n\n\n

37. In a stationary wave, energy transfer between particles is:
<\/strong><\/mark>a) Maximum
b) Zero
c) Equal to progressive wave
d) Double
Answer:<\/strong> b
Explanation:<\/strong> Stationary waves do not transfer energy; only store energy between particles.<\/p>\n\n\n\n

38. If the equation of wave is , the wave is moving:
<\/mark><\/strong>a) In +x direction
b) In \u2013x direction
c) In +y direction
d) Stationary
Answer:<\/strong> b
Explanation:<\/strong> Form indicates propagation in \u2013x direction.<\/p>\n\n\n\n

39. If the displacement of a particle in wave is <\/mark><\/strong>, the speed of wave is:
a) 50\/\u03c0 m\/s
b) 100\/\u03c0 m\/s
c) 25\/\u03c0 m\/s
d) \u03c0\/50 m\/s
Answer:<\/strong> a
Explanation:<\/strong> , . Speed .<\/p>\n\n\n\n

40. A string 1 m long vibrates in fundamental mode with frequency 200 Hz. Speed of wave is:
<\/mark><\/strong>a) 200 m\/s
b) 400 m\/s
c) 100 m\/s
d) 50 m\/s
Answer:<\/strong> b
Explanation:<\/strong> m\/s.<\/p>\n\n\n\n

41. If two waves superpose destructively, the amplitude becomes:
<\/mark><\/strong>a) Maximum
b) Zero
c) Doubled
d) Half
Answer:<\/strong> b
Explanation:<\/strong> Destructive interference cancels amplitude.<\/p>\n\n\n\n

42. Which condition is necessary for formation of stationary waves?
<\/mark><\/strong>a) Same frequency
b) Same amplitude
c) Opposite directions
d) All of these
Answer:<\/strong> d
Explanation:<\/strong> For stationary waves: same frequency, amplitude, direction opposite.<\/p>\n\n\n\n

43. In the 2nd harmonic of a string, number of antinodes is:
<\/mark><\/strong>a) 1
b) 2
c) 3
d) 4
Answer:<\/strong> b
Explanation:<\/strong> Second harmonic \u2192 2 loops \u2192 2 antinodes.<\/p>\n\n\n\n

44. The wave equation is <\/mark><\/strong>. Its period is:
a) 0.031 s
b) 0.05 s
c) 0.1 s
d) 0.2 s
Answer:<\/strong> b
Explanation:<\/strong> , s. Correct = a<\/strong>.<\/p>\n\n\n\n

45. In stationary waves, pressure variation nodes occur at:
<\/mark><\/strong>a) Displacement nodes
b) Displacement antinodes
c) Midpoints
d) Everywhere
Answer:<\/strong> b
Explanation:<\/strong> Pressure node \u2194 displacement antinode; pressure antinode \u2194 displacement node.<\/p>\n\n\n\n

46. The frequency of nth harmonic in open organ pipe is:
<\/mark><\/strong>a)
b)
c)
d)
Answer:<\/strong> a
Explanation:<\/strong> Open pipe supports all harmonics: .<\/p>\n\n\n\n

47. In closed organ pipe, the frequencies present are:
<\/mark><\/strong>a) Only even harmonics
b) Only odd harmonics
c) Both even and odd
d) None
Answer:<\/strong> b
Explanation:<\/strong> Closed pipe supports odd harmonics: .<\/p>\n\n\n\n

48. In stationary waves, adjacent nodes are separated by:
<\/mark><\/strong>a)
b)
c)
d)
Answer:<\/strong> b
Explanation:<\/strong> Node\u2013node separation = .<\/p>\n\n\n\n

49. When two identical waves superimpose in opposite directions, the wave velocity becomes:
<\/mark><\/strong>a) Zero
b) Double
c) Same as original
d) Infinite
Answer:<\/strong> c
Explanation:<\/strong> Velocity of component waves unchanged; resultant is standing but wave speed is same.<\/p>\n\n\n\n

50. In superposition, if phase difference is 90\u00b0, resultant amplitude is:
<\/mark><\/strong>a)
b)
c)
d)
Answer:<\/strong> c
Explanation:<\/strong> At phase difference 90\u00b0, .<\/p>\n\n\n\n

51. Sound waves in air are:
<\/mark><\/strong>a) Longitudinal
b) Transverse
c) Electromagnetic
d) Polarized
Answer:<\/strong> a
Explanation:<\/strong> Sound propagates as longitudinal compressions and rarefactions.<\/p>\n\n\n\n

52. The speed of sound increases with:
<\/mark><\/strong>a) Decrease in temperature
b) Increase in humidity
c) Decrease in pressure
d) Vacuum
Answer:<\/strong> b
Explanation:<\/strong> More water vapor lowers effective density of air, increasing sound speed.<\/p>\n\n\n\n

53. The audible frequency range for humans is:
<\/mark><\/strong>a) 0\u2013100 Hz
b) 20\u201320,000 Hz
c) 200\u20132000 Hz
d) Above 20,000 Hz
Answer:<\/strong> b
Explanation:<\/strong> Human ears detect frequencies in the range 20 Hz to 20 kHz.<\/p>\n\n\n\n

54. Sound waves with frequency above 20,000 Hz are called:
<\/mark><\/strong>a) Infrasonic
b) Supersonic
c) Ultrasonic
d) Subsonic
Answer:<\/strong> c
Explanation:<\/strong> Ultrasonic waves are >20 kHz.<\/p>\n\n\n\n

55. The loudness of sound depends on:
<\/mark><\/strong>a) Frequency
b) Amplitude
c) Speed
d) Medium
Answer:<\/strong> b
Explanation:<\/strong> Loudness \u221d square of amplitude.<\/p>\n\n\n\n

56. The pitch of a sound is determined by:
<\/mark><\/strong>a) Amplitude
b) Frequency
c) Wavelength
d) Speed
Answer:<\/strong> b
Explanation:<\/strong> Higher frequency = higher pitch.<\/p>\n\n\n\n

57. Two tuning forks of frequency 256 Hz and 260 Hz are sounded together. The number of beats per second is:
<\/mark><\/strong>a) 2
b) 3
c) 4
d) 5
Answer:<\/strong> b
Explanation:<\/strong> Beat frequency = . Correct = c<\/strong>.<\/p>\n\n\n\n

58. The time interval between two successive compressions in air of frequency 200 Hz is:
<\/mark><\/strong>a) 0.002 s
b) 0.005 s
c) 0.01 s
d) 0.02 s
Answer:<\/strong> c
Explanation:<\/strong> s. Correct = b<\/strong>.<\/p>\n\n\n\n

59. The reflection of sound producing multiple echoes in auditorium is called:
<\/mark><\/strong>a) Reverberation
b) Resonance
c) Diffraction
d) Doppler effect
Answer:<\/strong> a
Explanation:<\/strong> Persistence of sound due to multiple reflections = reverberation.<\/p>\n\n\n\n

60. The phenomenon when frequency of sound heard is different due to relative motion is:
<\/mark><\/strong>a) Echo
b) Resonance
c) Doppler effect
d) Beats
Answer:<\/strong> c
Explanation:<\/strong> Doppler effect = change in frequency due to motion of source\/observer.<\/p>\n\n\n\n

61. A train sounding a whistle of frequency 500 Hz approaches a stationary listener at 20 m\/s. Speed of sound = 340 m\/s. The apparent frequency is:
<\/mark><\/strong>a) 529 Hz
b) 471 Hz
c) 515 Hz
d) 540 Hz
Answer:<\/strong> a
Explanation:<\/strong> Hz.<\/p>\n\n\n\n

62. If the source of sound moves away from observer, the observed frequency:
<\/mark><\/strong>a) Increases
b) Decreases
c) Remains same
d) Becomes zero
Answer:<\/strong> b
Explanation:<\/strong> Doppler effect: receding source \u2192 lower observed frequency.<\/p>\n\n\n\n

63. If a tuning fork of frequency 512 Hz produces 4 beats per second with another fork, the other fork may have frequency:
<\/mark><\/strong>a) 508 Hz or 516 Hz
b) 504 Hz or 520 Hz
c) 512 Hz
d) 500 Hz
Answer:<\/strong> a
Explanation:<\/strong> Beat frequency = 4 \u2192 other fork = 512 \u00b1 4.<\/p>\n\n\n\n

64. The natural frequency of an object depends on:
<\/mark><\/strong>a) Shape
b) Size
c) Material
d) All of these
Answer:<\/strong> d
Explanation:<\/strong> Natural frequency depends on mass, shape, material, size.<\/p>\n\n\n\n

65. Resonance occurs when:
<\/mark><\/strong>a) Driving frequency = natural frequency
b) Amplitude = zero
c) Wavelength = amplitude
d) None
Answer:<\/strong> a
Explanation:<\/strong> Resonance = maximum amplitude oscillation at natural frequency.<\/p>\n\n\n\n

66. Which phenomenon is used in tuning musical instruments?
<\/mark><\/strong>a) Beats
b) Echo
c) Diffraction
d) Polarization
Answer:<\/strong> a
Explanation:<\/strong> Beats help musicians tune instruments by matching frequencies.<\/p>\n\n\n\n

67. Which of the following is an example of resonance?
<\/mark><\/strong>a) Swing pushed at regular intervals
b) Tuning fork vibrating near another of same frequency
c) Shattering of glass by loud sound
d) All of these
Answer:<\/strong> d
Explanation:<\/strong> All are resonance examples.<\/p>\n\n\n\n

68. The quality or timbre of a sound depends on:
<\/mark><\/strong>a) Frequency
b) Amplitude
c) Waveform (overtones)
d) Speed
Answer:<\/strong> c
Explanation:<\/strong> Timbre depends on waveform and overtones.<\/p>\n\n\n\n

69. If the speed of sound in air is 330 m\/s, the wavelength of 660 Hz sound is:
<\/mark><\/strong>a) 0.25 m
b) 0.5 m
c) 1 m
d) 2 m
Answer:<\/strong> b
Explanation:<\/strong> m.<\/p>\n\n\n\n

70. The minimum distance for echo to be heard clearly is:
<\/mark><\/strong>a) 17 m
b) 34 m
c) 50 m
d) 100 m
Answer:<\/strong> b
Explanation:<\/strong> Echo requires delay \u22650.1 s. At 340 m\/s \u2192 distance = 340\u00d70.1\/2 = 17 m (one-way). For echo: minimum object distance = 17 m. Correct = a<\/strong>.<\/p>\n\n\n\n

71. A sonometer wire resonates with tuning fork at 256 Hz when length is 0.5 m. Velocity of wave on wire is:
<\/mark><\/strong>a) 128 m\/s
b) 256 m\/s
c) 512 m\/s
d) 1024 m\/s
Answer:<\/strong> c
Explanation:<\/strong> . Correct = b<\/strong>.<\/p>\n\n\n\n

72. The phenomenon of sound heard after reflection from a distant surface is:
<\/mark><\/strong>a) Echo
b) Beats
c) Resonance
d) Refraction
Answer:<\/strong> a
Explanation:<\/strong> Echo = reflected sound heard separately.<\/p>\n\n\n\n

73. The persistence of sound due to multiple reflections is undesirable in halls. It is reduced by:
<\/mark><\/strong>a) Using hard walls
b) Using soft materials like curtains
c) Using smooth ceilings
d) Increasing reflection
Answer:<\/strong> b
Explanation:<\/strong> Absorbing materials reduce reverberation.<\/p>\n\n\n\n

74. In resonance tube experiment, if first resonance occurs at 20 cm, second will occur at:
<\/mark><\/strong>a) 40 cm
b) 60 cm
c) 80 cm
d) 100 cm
Answer:<\/strong> b
Explanation:<\/strong> Closed pipe resonance \u2192 successive resonance positions differ by .<\/p>\n\n\n\n

75. Beats are heard when two sounds of frequencies:
<\/mark><\/strong>a) Widely different
b) Slightly different
c) Same
d) One is zero
Answer:<\/strong> b
Explanation:<\/strong> Beat phenomenon occurs when frequency difference \u2264 10 Hz (approx.).<\/p>\n\n\n\n

76. The wave equation is given by <\/mark><\/strong>. The wavelength is:
a) 2 m
b) 4 m
c) 5 m
d) 10 m
Answer:<\/strong> c
Explanation:<\/strong> Equation form: . Here coefficient of = 0.2 \u2192 . So m.<\/p>\n\n\n\n

77. A string 2 m long is vibrating in fundamental mode. Wave speed = 100 m\/s. Frequency is:
<\/mark><\/strong>a) 25 Hz
b) 50 Hz
c) 100 Hz
d) 200 Hz
Answer:<\/strong> b
Explanation:<\/strong> . Correct = a<\/strong>.<\/p>\n\n\n\n

78. The frequency of nth harmonic of a closed organ pipe is proportional to:
<\/mark><\/strong>a)
b)
c) Odd multiples of fundamental
d) Square of
Answer:<\/strong> c
Explanation:<\/strong> Closed pipe supports only odd harmonics (1st, 3rd, 5th \u2026).<\/p>\n\n\n\n

79. Which of the following is not a characteristic of stationary waves?
<\/mark><\/strong>a) Presence of nodes and antinodes
b) Energy transfer along the medium
c) Formed by superposition of two opposite waves
d) No progressive wave motion
Answer:<\/strong> b
Explanation:<\/strong> Stationary waves do not transfer energy.<\/p>\n\n\n\n

80. Two waves of amplitudes each superpose in opposite phase. Resultant amplitude is<\/mark>:
<\/strong>a) 0
b) a
c) 2a
d) None
Answer:<\/strong> a
Explanation:<\/strong> Destructive interference \u2192 amplitudes cancel.<\/p>\n\n\n\n

81. The velocity of transverse wave on a stretched string depends on:
<\/mark><\/strong>a) Tension only
b) Mass per unit length only
c) Tension and mass per unit length
d) Length of string
Answer:<\/strong> c
Explanation:<\/strong> , where = mass\/length.<\/p>\n\n\n\n

82. The fundamental frequency of a string is 200 Hz. Its third harmonic is:
<\/mark><\/strong>a) 400 Hz
b) 600 Hz
c) 800 Hz
d) 100 Hz
Answer:<\/strong> b
Explanation:<\/strong> Harmonics are integral multiples: .<\/p>\n\n\n\n

83. The speed of sound in hydrogen is about:
<\/mark><\/strong>a) Same as in oxygen
b) \u221a(M\/M) times faster
c) Slower than in oxygen
d) Independent of gas
Answer:<\/strong> b
Explanation:<\/strong> . Hydrogen lighter than oxygen \u2192 sound faster.<\/p>\n\n\n\n

84. The energy of a wave is proportional to:
<\/mark><\/strong>a) Frequency
b) Amplitude squared
c) Wavelength
d) Speed
Answer:<\/strong> b
Explanation:<\/strong> Wave energy \u221d .<\/p>\n\n\n\n

85. In a resonance column experiment, air column resonates with tuning fork at 32 cm and again at 100 cm. Wavelength of sound is:
<\/mark><\/strong>a) 34 cm
b) 68 cm
c) 136 cm
d) 200 cm
Answer:<\/strong> c
Explanation:<\/strong> Difference between resonant lengths = \u2192 cm.<\/p>\n\n\n\n

86. If the length of a closed organ pipe is doubled, its fundamental frequency becomes:
<\/mark><\/strong>a) Half
b) Double
c) Same
d) Four times
Answer:<\/strong> a
Explanation:<\/strong> . Doubling halves frequency.<\/p>\n\n\n\n

87. When two sound waves of slightly different frequencies interfere, the phenomenon heard is:
<\/mark><\/strong>a) Echo
b) Beats
c) Resonance
d) Reverberation
Answer:<\/strong> b
Explanation:<\/strong> Beats = periodic rise and fall of sound intensity.<\/p>\n\n\n\n

88. If two progressive waves having same amplitude and frequency move in opposite direction, they produce:
<\/mark><\/strong>a) Interference
b) Stationary waves
c) Beats
d) Random waves
Answer:<\/strong> b
Explanation:<\/strong> Opposite waves of same frequency = stationary wave.<\/p>\n\n\n\n

89. The first overtone of a closed organ pipe is its:
<\/mark><\/strong>a) 2nd harmonic
b) 3rd harmonic
c) 4th harmonic
d) Fundamental
Answer:<\/strong> b
Explanation:<\/strong> Closed pipe supports only odd harmonics \u2192 1st overtone = 3rd harmonic.<\/p>\n\n\n\n

90. The apparent frequency heard when source moves towards observer is given by:
<\/mark><\/strong>a)
b)
c)
d)
Answer:<\/strong> b
Explanation:<\/strong> For approaching source: .<\/p>\n\n\n\n

91. A wave is represented by <\/mark><\/strong>. Frequency is:
a) 50 Hz
b) 100 Hz
c) 200 Hz
d) 400 Hz
Answer:<\/strong> b
Explanation:<\/strong> .<\/p>\n\n\n\n

92. A sound wave travels from air into water. Which quantity remains unchanged?
<\/mark><\/strong>a) Wavelength
b) Speed
c) Frequency
d) Amplitude
Answer:<\/strong> c
Explanation:<\/strong> Frequency is independent of medium.<\/p>\n\n\n\n

93. The fundamental frequency of open pipe of length L is:
<\/mark><\/strong>a)
b)
c)
d)
Answer:<\/strong> a
Explanation:<\/strong> For open pipe: .<\/p>\n\n\n\n

94. The loudness of sound is measured in:
<\/mark><\/strong>a) Joule
b) Watt
c) Decibel
d) Hertz
Answer:<\/strong> c
Explanation:<\/strong> Loudness is measured in dB.<\/p>\n\n\n\n

95. Which of the following is not an application of ultrasound?
<\/mark><\/strong>a) Cleaning
b) SONAR
c) Medical imaging
d) Radio broadcasting
Answer:<\/strong> d
Explanation:<\/strong> Ultrasound is not used in radio.<\/p>\n\n\n\n

96. If a wave has frequency 500 Hz and wavelength 0.68 m, its velocity is:
<\/mark><\/strong>a) 200 m\/s
b) 250 m\/s
c) 300 m\/s
d) 340 m\/s
Answer:<\/strong> d
Explanation:<\/strong> .<\/p>\n\n\n\n

97. Which of the following is an example of transverse wave?
<\/mark><\/strong>a) Sound in air
b) Light wave
c) Seismic P-wave
d) Compressions in slinky
Answer:<\/strong> b
Explanation:<\/strong> Light is transverse.<\/p>\n\n\n\n

98. Which of the following travels with maximum speed in air?
<\/mark><\/strong>a) Sound
b) Light
c) Ultrasonic
d) Infrasonic
Answer:<\/strong> b
Explanation:<\/strong> Light travels at m\/s, much faster than sound.<\/p>\n\n\n\n

99. In stationary waves, distance between two adjacent nodes is:
<\/mark><\/strong>a)
b)
c)
d)
Answer:<\/strong> b
Explanation:<\/strong> Node\u2013node distance = half wavelength.<\/p>\n\n\n\n

100. SONAR is based on:
<\/mark><\/strong>a) Doppler effect
b) Total internal reflection
c) Echo principle
d) Diffraction
Answer:<\/strong> c
Explanation:<\/strong> SONAR uses reflection (echo) of ultrasound waves.<\/p>\n","protected":false},"excerpt":{"rendered":"

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