{"id":12433,"date":"2025-09-15T08:39:48","date_gmt":"2025-09-15T07:39:48","guid":{"rendered":"https:\/\/mcqsadda.com\/?p=12433"},"modified":"2025-10-22T09:27:35","modified_gmt":"2025-10-22T08:27:35","slug":"sound-top-100-mcqs-with-answer-and-explanation","status":"publish","type":"post","link":"https:\/\/mcqsadda.com\/index.php\/2025\/09\/15\/sound-top-100-mcqs-with-answer-and-explanation\/","title":{"rendered":"Sound Top 100 MCQs With Answer and Explanation"},"content":{"rendered":"\n

1. What is the nature of sound waves?<\/mark><\/strong>
a) Transverse
b) Longitudinal
c) Electromagnetic
d) None of the above
Answer:<\/strong> b) Longitudinal
Explanation:<\/strong> Sound waves propagate by compressions and rarefactions in the medium, which is characteristic of longitudinal waves.<\/p>\n\n\n\n

2. The speed of sound is maximum in which medium?<\/mark><\/strong>
a) Air
b) Water
c) Steel
d) Vacuum
Answer:<\/strong> c) Steel
Explanation:<\/strong> Sound travels fastest in solids because particles are closer, allowing quicker transmission of vibrations. It cannot travel in vacuum.<\/p>\n\n\n\n

3. What is the unit of frequency?<\/mark><\/strong>
a) Hertz
b) Decibel
c) Newton
d) Joule
Answer:<\/strong> a) Hertz
Explanation:<\/strong> Frequency is the number of oscillations per second, measured in Hertz (Hz).<\/p>\n\n\n\n

4. Which of the following affects the speed of sound in air?<\/mark><\/strong>
a) Temperature
b) Humidity
c) Pressure
d) Both a and b
Answer:<\/strong> d) Both a and b
Explanation:<\/strong> Speed of sound increases with temperature and humidity; pressure has negligible effect at constant temperature.<\/p>\n\n\n\n

5. What is the audible range of frequency for a healthy human ear?<\/mark><\/strong>
a) 20 Hz to 20 kHz
b) 10 Hz to 10 kHz
c) 50 Hz to 15 kHz
d) 5 Hz to 25 kHz
Answer:<\/strong> a) 20 Hz to 20 kHz
Explanation:<\/strong> Humans typically hear sounds between 20 Hz and 20,000 Hz.<\/p>\n\n\n\n

6. The phenomenon of bending of sound waves around obstacles is called:<\/mark><\/strong>
a) Reflection
b) Diffraction
c) Refraction
d) Interference
Answer:<\/strong> b) Diffraction
Explanation:<\/strong> Diffraction occurs when sound waves bend around corners or obstacles.<\/p>\n\n\n\n

7. Echo is produced due to:<\/mark><\/strong>
a) Diffraction
b) Reflection
c) Refraction
d) Resonance
Answer:<\/strong> b) Reflection
Explanation:<\/strong> Echo is the reflection of sound waves from a hard surface back to the listener.<\/p>\n\n\n\n

8. If the frequency of a sound wave is doubled, its wavelength will:<\/mark><\/strong>
a) Double
b) Halve
c) Remain same
d) Become zero
Answer:<\/strong> b) Halve
Explanation:<\/strong> Speed = frequency \u00d7 wavelength. If speed is constant, increasing frequency halves the wavelength.<\/p>\n\n\n\n

9. The loudness of sound depends on:<\/mark><\/strong>
a) Frequency
b) Amplitude
c) Wavelength
d) Velocity
Answer:<\/strong> b) Amplitude
Explanation:<\/strong> Loudness is related to the amplitude of the sound wave; higher amplitude means louder sound.<\/p>\n\n\n\n

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

11. What type of wave is ultrasound?<\/mark><\/strong>
a) Below 20 Hz
b) Between 20 Hz and 20 kHz
c) Above 20 kHz
d) None of the above
Answer:<\/strong> c) Above 20 kHz
Explanation:<\/strong> Ultrasound refers to sound waves with frequency higher than the audible range (>20,000 Hz).<\/p>\n\n\n\n

12. In the Doppler effect, when the source approaches the observer, the frequency:<\/mark><\/strong>
a) Increases
b) Decreases
c) Remains constant
d) Becomes zero
Answer:<\/strong> a) Increases
Explanation:<\/strong> The observed frequency increases because the source moves closer, compressing wavefronts.<\/p>\n\n\n\n

13. The time period of a sound wave with frequency 500 Hz is:<\/mark><\/strong>
a) 0.002 s
b) 0.005 s
c) 2 s
d) 500 s
Answer:<\/strong> a) 0.002 s
Explanation:<\/strong> Time period seconds<\/p>\n\n\n\n

14. Which of the following materials is best for sound insulation?<\/mark><\/strong>
a) Steel
b) Wood
c) Air
d) Foam
Answer:<\/strong> d) Foam
Explanation:<\/strong> Foam absorbs sound energy effectively and reduces transmission.<\/p>\n\n\n\n

15. What is the approximate speed of sound in air at room temperature?<\/mark><\/strong>
a) 330 m\/s
b) 1500 m\/s
c) 3000 m\/s
d) 0 m\/s
Answer:<\/strong> a) 330 m\/s
Explanation:<\/strong> At 20\u00b0C, the speed of sound in air is roughly 330 m\/s.<\/p>\n\n\n\n

16. Which physical quantity determines the energy carried by a sound wave?<\/mark><\/strong>
a) Frequency
b) Wavelength
c) Amplitude
d) Speed
Answer:<\/strong> c) Amplitude
Explanation:<\/strong> Energy carried by a wave is proportional to the square of the amplitude.<\/p>\n\n\n\n

17. Beats are formed when:<\/mark><\/strong>
a) Two sound waves of different frequencies interfere
b) Two sound waves of same frequency interfere
c) A sound wave is reflected
d) None of the above
Answer:<\/strong> a) Two sound waves of different frequencies interfere
Explanation:<\/strong> Beats arise due to interference of two waves of slightly different frequencies.<\/p>\n\n\n\n

18. The unit of loudness is:<\/mark><\/strong>
a) Hertz
b) Decibel
c) Watt
d) Newton
Answer:<\/strong> b) Decibel
Explanation:<\/strong> Loudness is measured in decibels (dB), a logarithmic unit.<\/p>\n\n\n\n

19. What happens to the speed of sound when temperature increases?<\/mark><\/strong>
a) Increases
b) Decreases
c) Remains constant
d) Becomes zero
Answer:<\/strong> a) Increases
Explanation:<\/strong> Molecules move faster at higher temperature, increasing sound speed.<\/p>\n\n\n\n

20. Resonance in sound occurs when:<\/mark><\/strong>
a) Frequency of the sound matches natural frequency of the object
b) Amplitude is maximum
c) Speed of sound increases
d) Wavelength decreases
Answer:<\/strong> a) Frequency of the sound matches natural frequency of the object
Explanation:<\/strong> Resonance happens when an object vibrates with maximum amplitude at its natural frequency.<\/p>\n\n\n\n

21. The wavelength of sound in air is maximum when its frequency is:<\/mark><\/strong>
a) High
b) Low
c) Medium
d) None of the above
Answer:<\/strong> b) Low
Explanation:<\/strong> Wavelength . For a constant speed , lower frequency means longer wavelength.<\/p>\n\n\n\n

22. Which part of the human ear helps in amplifying the sound?<\/mark><\/strong>
a) Eardrum
b) Cochlea
c) Ossicles
d) Ear canal
Answer:<\/strong> c) Ossicles
Explanation:<\/strong> The ossicles (malleus, incus, stapes) amplify sound vibrations from the eardrum to the inner ear.<\/p>\n\n\n\n

23. Which phenomenon explains why sound is louder near a wall?<\/mark><\/strong>
a) Diffraction
b) Reflection
c) Interference
d) Resonance
Answer:<\/strong> b) Reflection
Explanation:<\/strong> Sound waves reflect off walls and superimpose, increasing loudness near the surface.<\/p>\n\n\n\n

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

25. The velocity of sound depends primarily on:<\/mark><\/strong>
a) Pressure and humidity
b) Temperature and medium
c) Frequency and amplitude
d) Wavelength and pressure
Answer:<\/strong> b) Temperature and medium
Explanation:<\/strong> Speed of sound varies mainly with the medium type and temperature.<\/p>\n\n\n\n

26. When sound passes from warm air to cold air, it:<\/mark><\/strong>
a) Bends towards the cold air
b) Bends away from the cold air
c) Remains straight
d) Reflects
Answer:<\/strong> a) Bends towards the cold air
Explanation:<\/strong> Sound bends towards the region of lower speed, which is cold air.<\/p>\n\n\n\n

27. The minimum distance between two points which produce audible beats is:<\/mark><\/strong>
a) One wavelength
b) Half wavelength
c) One-fourth wavelength
d) None of the above
Answer:<\/strong> b) Half wavelength
Explanation:<\/strong> Beats occur due to interference and the minimum path difference for audible beats is half wavelength.<\/p>\n\n\n\n

28. What is the main cause of echo fading away?<\/mark><\/strong>
a) Absorption
b) Reflection
c) Diffraction
d) Refraction
Answer:<\/strong> a) Absorption
Explanation:<\/strong> Echo fades because sound energy is absorbed by air and surfaces, reducing intensity.<\/p>\n\n\n\n

29. The Doppler effect is not observed when:<\/mark><\/strong>
a) Source is stationary and observer moves
b) Both source and observer move
c) Both are stationary
d) Source moves and observer is stationary
Answer:<\/strong> c) Both are stationary
Explanation:<\/strong> No relative motion means no change in observed frequency.<\/p>\n\n\n\n

30. In an open organ pipe, the fundamental frequency is <\/strong>. Its first overtone will be:<\/strong><\/mark>
a)
b)
c)
d)
Answer:<\/strong> b)
Explanation:<\/strong> An open pipe supports all harmonics; the first overtone is the second harmonic (2f).<\/p>\n\n\n\n

31. In a closed organ pipe, the first overtone frequency is:<\/mark><\/strong>
a) Twice the fundamental
b) Three times the fundamental
c) Four times the fundamental
d) Equal to the fundamental
Answer:<\/strong> b) Three times the fundamental
Explanation:<\/strong> Closed pipe supports odd harmonics only, so the first overtone = 3 \u00d7 fundamental.<\/p>\n\n\n\n

32. Which of the following is a practical application of ultrasound?<\/mark><\/strong>
a) Echocardiography
b) Radio transmission
c) Mobile communication
d) Radioactive dating
Answer:<\/strong> a) Echocardiography
Explanation:<\/strong> Ultrasound imaging helps visualize internal body organs.<\/p>\n\n\n\n

33. Noise can be reduced by:<\/mark><\/strong>
a) Using sound-absorbing materials
b) Increasing sound frequency
c) Increasing amplitude
d) Using loudspeakers
Answer:<\/strong> a) Using sound-absorbing materials
Explanation:<\/strong> Materials like foam absorb sound waves and reduce noise pollution.<\/p>\n\n\n\n

34. The energy of a sound wave is proportional to:<\/mark><\/strong>
a) Frequency
b) Wavelength
c) Amplitude squared
d) Velocity
Answer:<\/strong> c) Amplitude squared
Explanation:<\/strong> Energy carried by sound is proportional to the square of amplitude.<\/p>\n\n\n\n

35. The decibel scale is:<\/mark><\/strong>
a) Linear
b) Exponential
c) Logarithmic
d) None of these
Answer:<\/strong> c) Logarithmic
Explanation:<\/strong> Decibel scale measures sound intensity logarithmically.<\/p>\n\n\n\n

36. Which phenomenon causes a change in sound frequency due to motion?<\/mark><\/strong>
a) Interference
b) Diffraction
c) Doppler effect
d) Resonance
Answer:<\/strong> c) Doppler effect
Explanation:<\/strong> Doppler effect describes frequency changes due to relative motion.<\/p>\n\n\n\n

37. The sound waves in a room reflect multiple times causing:<\/mark><\/strong>
a) Echo
b) Reverberation
c) Diffraction
d) Absorption
Answer:<\/strong> b) Reverberation
Explanation:<\/strong> Reverberation is the persistence of sound due to multiple reflections.
<\/p>\n\n\n\n

39. The pitch of a sound is high when:<\/mark><\/strong>
a) Frequency is low
b) Amplitude is high
c) Frequency is high
d) Wavelength is long
Answer:<\/strong> c) Frequency is high
Explanation:<\/strong> Pitch depends on frequency; higher frequency means higher pitch.<\/p>\n\n\n\n

40. The speed of sound in water is approximately:<\/mark><\/strong>
a) 330 m\/s
b) 1500 m\/s
c) 5000 m\/s
d) 100 m\/s
Answer:<\/strong> b) 1500 m\/s
Explanation:<\/strong> Sound travels faster in water than in air due to denser medium.<\/p>\n\n\n\n

41. What happens to the wavelength of sound if the speed of sound doubles but frequency remains constant?<\/mark><\/strong>
a) Doubles
b) Halves
c) Remains same
d) Becomes zero
Answer:<\/strong> a) Doubles
Explanation:<\/strong> . If doubles and stays constant, doubles.<\/p>\n\n\n\n

42. The distance between two successive compressions in a sound wave is called:<\/mark><\/strong>
a) Amplitude
b) Frequency
c) Wavelength
d) Time period
Answer:<\/strong> c) Wavelength
Explanation:<\/strong> The wavelength is the length of one complete wave cycle, including one compression and one rarefaction.<\/p>\n\n\n\n

43. What is the effect of humidity on the speed of sound?<\/mark><\/strong>
a) Speed decreases with humidity
b) Speed increases with humidity
c) Speed remains constant
d) None of the above
Answer:<\/strong> b) Speed increases with humidity
Explanation:<\/strong> Moist air is less dense than dry air, increasing sound speed.<\/p>\n\n\n\n

44. What is the frequency range of infrasound?<\/mark><\/strong>
a) Below 20 Hz
b) 20 Hz to 20 kHz
c) Above 20 kHz
d) None of the above
Answer:<\/strong> a) Below 20 Hz
Explanation:<\/strong> Infrasound refers to frequencies below human hearing range (<20 Hz).<\/p>\n\n\n\n

45. The time taken for an echo to return from a surface 340 m away is:<\/mark><\/strong>
a) 0.5 s
b) 1 s
c) 2 s
d) 4 s
Answer:<\/strong> b) 2 s
Explanation:<\/strong> Total distance travelled by sound = 2 \u00d7 340 = 680 m. Time = Distance\/Speed = 680\/340 = 2 s.<\/p>\n\n\n\n

46. The frequency of a source is 100 Hz. What frequency will a stationary observer hear if the source moves towards him at speed 20 m\/s? (Speed of sound = 340 m\/s)<\/mark><\/strong>
a) 106 Hz
b) 94 Hz
c) 100 Hz
d) 110 Hz
Answer:<\/strong> a) 106 Hz
Explanation:<\/strong> Doppler formula:
, here , , ,
Hz.<\/p>\n\n\n\n

47. The phenomenon of increase in amplitude when a sound wave matches the natural frequency of an object is called:<\/mark><\/strong>
a) Reflection
b) Resonance
c) Diffraction
d) Interference
Answer:<\/strong> b) Resonance
Explanation:<\/strong> Resonance causes large amplitude oscillations when frequency matches natural frequency.<\/p>\n\n\n\n

48. Which of the following instruments works on the principle of resonance?<\/mark><\/strong>
a) Flute
b) Violin
c) Organ pipe
d) Both a and c
Answer:<\/strong> d) Both a and c
Explanation:<\/strong> Both flute and organ pipe produce sound by resonance.<\/p>\n\n\n\n

49. The speed of sound in air at 0\u00b0C is approximately:<\/mark><\/strong>
a) 273 m\/s
b) 331 m\/s
c) 343 m\/s
d) 300 m\/s
Answer:<\/strong> b) 331 m\/s
Explanation:<\/strong> At 0\u00b0C, sound speed is about 331 m\/s.<\/p>\n\n\n\n

50. When sound waves interfere constructively, the resulting sound is:<\/mark><\/strong>
a) Loud
b) Soft
c) No sound
d) None of the above
Answer:<\/strong> a) Loud
Explanation:<\/strong> Constructive interference increases amplitude and loudness.<\/p>\n\n\n\n

51. Which part of the ear converts sound vibrations into electrical signals?<\/mark><\/strong>
a) Cochlea
b) Eardrum
c) Ossicles
d) Auditory nerve
Answer:<\/strong> a) Cochlea
Explanation:<\/strong> Cochlea contains hair cells that convert mechanical vibrations to nerve impulses.<\/p>\n\n\n\n

52. The audible range for dogs is approximately:<\/mark><\/strong>
a) 20 Hz to 20 kHz
b) 40 Hz to 60 kHz
c) 10 Hz to 30 kHz
d) 1 kHz to 10 kHz
Answer:<\/strong> b) 40 Hz to 60 kHz
Explanation:<\/strong> Dogs can hear higher frequencies beyond human audible range.<\/p>\n\n\n\n

53. The minimum distance between two points where destructive interference occurs in sound waves is:<\/mark><\/strong>
a)
b)
c)
d)
Answer:<\/strong> b)
Explanation:<\/strong> Destructive interference occurs at path difference of half wavelength.<\/p>\n\n\n\n

54. The frequency of beats formed when two sound waves of 250 Hz and 254 Hz interfere is:<\/mark><\/strong>
a) 4 Hz
b) 500 Hz
c) 2 Hz
d) 254 Hz
Answer:<\/strong> a) 4 Hz
Explanation:<\/strong> Beat frequency = Hz.<\/p>\n\n\n\n

55. Which of the following has the slowest speed of sound?<\/mark><\/strong>
a) Steel
b) Water
c) Air
d) Vacuum
Answer:<\/strong> c) Air
Explanation:<\/strong> Sound travels slowest in gases like air compared to liquids and solids.<\/p>\n\n\n\n

56. A sound wave in air has a frequency of 1000 Hz and wavelength of 0.34 m. What is the speed of sound?<\/mark><\/strong>
a) 340 m\/s
b) 1000 m\/s
c) 0.34 m\/s
d) 3.4 m\/s
Answer:<\/strong> a) 340 m\/s
Explanation:<\/strong> Speed = frequency \u00d7 wavelength = 1000 \u00d7 0.34 = 340 m\/s.<\/p>\n\n\n\n

57. What is the name of the region where air particles are spread apart in a sound wave?<\/mark><\/strong>
a) Compression
b) Rarefaction
c) Crest
d) Trough
Answer:<\/strong> b) Rarefaction
Explanation:<\/strong> Rarefaction is the part of a longitudinal wave where particles are furthest apart.<\/p>\n\n\n\n

58. The loudness of a sound is related to its:<\/mark><\/strong>
a) Frequency
b) Amplitude
c) Wavelength
d) Speed
Answer:<\/strong> b) Amplitude
Explanation:<\/strong> Larger amplitude corresponds to louder sound.<\/p>\n\n\n\n

59. The reflection of sound waves is called:<\/mark><\/strong>
a) Echo
b) Reverberation
c) Diffraction
d) Refraction
Answer:<\/strong> a) Echo
Explanation:<\/strong> Echo is the reflection of sound heard after a delay.<\/p>\n\n\n\n

60. The difference between echo and reverberation is:<\/mark><\/strong>
a) Echo is single reflection; reverberation is multiple reflections
b) Echo is multiple reflections; reverberation is single reflection
c) Both are same
d) Echo has higher frequency
Answer:<\/strong> a) Echo is single reflection; reverberation is multiple reflections
Explanation:<\/strong> Reverberation is the persistence of sound due to multiple reflections.<\/p>\n\n\n\n

61. What is the wavelength of a sound wave of frequency 680 Hz in air, where speed of sound is 340 m\/s?<\/mark><\/strong>
a) 0.5 m
b) 2 m
c) 5 m
d) 0.05 m
Answer:<\/strong> a) 0.5 m
Explanation:<\/strong> m.<\/p>\n\n\n\n

62. In which medium does sound travel fastest?<\/mark><\/strong>
a) Air
b) Water
c) Steel
d) Vacuum
Answer:<\/strong> c) Steel
Explanation:<\/strong> Sound travels fastest in solids like steel.<\/p>\n\n\n\n

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

64. Which of the following devices is used to measure sound intensity?<\/mark><\/strong>
a) Barometer
b) Ammeter
c) Decibel meter
d) Thermometer
Answer:<\/strong> c) Decibel meter
Explanation:<\/strong> Decibel meter measures sound intensity in decibels.<\/p>\n\n\n\n

65. Which of the following describes the decrease in intensity of sound with distance?<\/mark><\/strong>
a) Diffraction
b) Attenuation
c) Reflection
d) Resonance
Answer:<\/strong> b) Attenuation
Explanation:<\/strong> Attenuation is the gradual loss of intensity over distance.<\/p>\n\n\n\n

66. Ultrasound waves have frequency:<\/mark><\/strong>
a) 20 Hz to 20 kHz
b) Above 20 kHz
c) Below 20 Hz
d) None of the above
Answer:<\/strong> b) Above 20 kHz
Explanation:<\/strong> Ultrasound is beyond human hearing (>20,000 Hz).<\/p>\n\n\n\n

67. Sonar technology uses:<\/mark><\/strong>
a) Light waves
b) Sound waves
c) Radio waves
d) Infrared waves
Answer:<\/strong> b) Sound waves
Explanation:<\/strong> Sonar uses sound waves for underwater detection.<\/p>\n\n\n\n

68. The phenomenon of change in direction of sound due to change in speed is called:<\/mark><\/strong>
a) Reflection
b) Refraction
c) Diffraction
d) Interference
Answer:<\/strong> b) Refraction
Explanation:<\/strong> Refraction is bending of waves when passing through different media.<\/p>\n\n\n\n

69. Which part of the ear acts as the ear drum?<\/mark><\/strong>
a) Cochlea
b) Tympanic membrane
c) Auditory nerve
d) Eustachian tube
Answer:<\/strong> b) Tympanic membrane
Explanation:<\/strong> The tympanic membrane vibrates in response to sound waves.<\/p>\n\n\n\n

70. The frequency of sound emitted by a tuning fork is 512 Hz. What is its time period?<\/mark><\/strong>
a) 0.002 s
b) 0.005 s
c) 0.00195 s
d) 0.01 s
Answer:<\/strong> c) 0.00195 s
Explanation:<\/strong> s.<\/p>\n\n\n\n

71. If frequency of sound is doubled, the pitch will:<\/mark><\/strong>
a) Double
b) Halve
c) Remain same
d) Become zero
Answer:<\/strong> a) Double
Explanation:<\/strong> Pitch is directly proportional to frequency.<\/p>\n\n\n\n

72. Echo can be heard clearly when the reflecting surface is at least:<\/mark><\/strong>
a) 10 m
b) 15 m
c) 17 m
d) 34 m
Answer:<\/strong> c) 17 m
Explanation:<\/strong> Minimum distance for echo = m (assuming 0.1 s delay).<\/p>\n\n\n\n

73. Which phenomenon allows us to hear someone speaking around a corner?<\/mark><\/strong>
a) Reflection
b) Refraction
c) Diffraction
d) Interference
Answer:<\/strong> c) Diffraction
Explanation:<\/strong> Diffraction allows bending of sound waves around obstacles.<\/p>\n\n\n\n

74. Loudness of sound depends on:<\/mark><\/strong>
a) Frequency
b) Amplitude
c) Wavelength
d) Speed
Answer:<\/strong> b) Amplitude
Explanation:<\/strong> Higher amplitude means louder sound.<\/p>\n\n\n\n

75. The threshold of hearing corresponds to sound intensity of:<\/mark><\/strong>
a)
b)
c)
d)
Answer:<\/strong> a)
Explanation:<\/strong> The minimum intensity humans can hear is approximately .<\/p>\n\n\n\n

76. The ear converts sound energy into:<\/mark><\/strong>
a) Electrical energy
b) Mechanical energy
c) Chemical energy
d) Light energy
Answer:<\/strong> a) Electrical energy
Explanation:<\/strong> Sound waves are converted into electrical impulses by the cochlea.<\/p>\n\n\n\n

77. The unit of sound intensity is:<\/mark><\/strong>
a) Watt
b) Decibel
c) Newton
d) Pascal
Answer:<\/strong> b) Decibel
Explanation:<\/strong> Intensity is measured in decibels (dB).<\/p>\n\n\n\n

78. Which device uses the principle of Doppler effect?<\/mark><\/strong>
a) Radar
b) Sonar
c) Ultrasonograph
d) All of these
Answer:<\/strong> d) All of these
Explanation:<\/strong> Radar, sonar, and ultrasonographs utilize Doppler effect principles.<\/p>\n\n\n\n

79. The wavelength of sound in steel is 2 m and frequency is 500 Hz. Find speed of sound in steel.<\/mark><\/strong>
a) 500 m\/s
b) 1000 m\/s
c) 1500 m\/s
d) 250 m\/s
Answer:<\/strong> b) 1000 m\/s
Explanation:<\/strong> m\/s.<\/p>\n\n\n\n

80. Which of the following cannot propagate sound?<\/mark><\/strong>
a) Solid
b) Liquid
c) Gas
d) Vacuum
Answer:<\/strong> d) Vacuum
Explanation:<\/strong> No medium, no sound propagation in vacuum.<\/p>\n\n\n\n

81. The loudness of a sound increases when the amplitude:<\/mark><\/strong>
a) Increases
b) Decreases
c) Remains constant
d) Becomes zero
Answer:<\/strong> a) Increases
Explanation:<\/strong> Loudness depends on amplitude of sound wave.<\/p>\n\n\n\n

82. In the Doppler effect, if source moves away from observer, the frequency:<\/mark><\/strong>
a) Increases
b) Decreases
c) Remains constant
d) Doubles
Answer:<\/strong> b) Decreases
Explanation:<\/strong> Frequency decreases when source moves away.<\/p>\n\n\n\n

83. The speed of sound in air increases by about 0.6 m\/s for every:<\/mark><\/strong>
a) 1\u00b0C rise in temperature
b) 1\u00b0C drop in temperature
c) 10\u00b0C rise in temperature
d) None of the above
Answer:<\/strong> a) 1\u00b0C rise in temperature
Explanation:<\/strong> Sound speed increases roughly 0.6 m\/s per degree Celsius rise.<\/p>\n\n\n\n

84. The wavelength of a 1000 Hz sound wave in air (speed = 340 m\/s) is:<\/mark><\/strong>
a) 0.34 m
b) 3.4 m
c) 34 m
d) 0.0034 m
Answer:<\/strong> a) 0.34 m
Explanation:<\/strong> m.<\/p>\n\n\n\n

85. The difference in path length between two coherent sources producing constructive interference is:<\/mark><\/strong>
a)
b)
c)
d)
Answer:<\/strong> b)
Explanation:<\/strong> Constructive interference occurs at path differences of multiples of .<\/p>\n\n\n\n

86. Which phenomenon causes the twinkling of stars, similar to sound refraction?<\/mark><\/strong>
a) Reflection
b) Diffraction
c) Refraction
d) Resonance
Answer:<\/strong> c) Refraction
Explanation:<\/strong> Atmospheric refraction causes twinkling of stars.<\/p>\n\n\n\n

87. Sound intensity is highest at:<\/mark><\/strong>
a) Nodes
b) Antinodes
c) Midpoints
d) None of these
Answer:<\/strong> b) Antinodes
Explanation:<\/strong> Antinodes are points of maximum amplitude.<\/p>\n\n\n\n

88. Which of the following is not a property of sound?<\/mark><\/strong>
a) Reflection
b) Refraction
c) Polarization
d) Diffraction
Answer:<\/strong> c) Polarization
Explanation:<\/strong> Sound waves (longitudinal) cannot be polarized.<\/p>\n\n\n\n

89. Frequency of ultrasound used in medical imaging is about:<\/mark><\/strong>
a) 20 Hz
b) 20 kHz
c) 2 MHz
d) 200 MHz
Answer:<\/strong> c) 2 MHz
Explanation:<\/strong> Ultrasound frequencies used for imaging are in MHz range.<\/p>\n\n\n\n

90. The time period of a 256 Hz tuning fork is:<\/mark><\/strong>
a) 3.9 ms
b) 4 ms
c) 0.39 ms
d) 0.004 s
Answer:<\/strong> a) 3.9 ms
Explanation:<\/strong> s = 3.9 ms.<\/p>\n\n\n\n

91. Which one of the following devices uses ultrasound waves?<\/mark><\/strong>
a) Microphone
b) Loudspeaker
c) Sonar
d) Radio
Answer:<\/strong> c) Sonar
Explanation:<\/strong> Sonar uses ultrasound for underwater detection.<\/p>\n\n\n\n

92. The term used for the time interval between two successive compressions in a sound wave is:<\/mark><\/strong>
a) Frequency
b) Wavelength
c) Time period
d) Amplitude
Answer:<\/strong> c) Time period
Explanation:<\/strong> Time period is the duration of one cycle of a wave.<\/p>\n\n\n\n

93. The intensity of sound is maximum at:<\/mark><\/strong>
a) Nodes
b) Antinodes
c) Midpoints between nodes and antinodes
d) None of these
Answer:<\/strong> b) Antinodes
Explanation:<\/strong> Antinodes are points of maximum displacement and energy.<\/p>\n\n\n\n

94. What type of wave is sound?<\/mark><\/strong>
a) Transverse wave
b) Longitudinal wave
c) Electromagnetic wave
d) None of these
Answer:<\/strong> b) Longitudinal wave
Explanation:<\/strong> Sound waves consist of compressions and rarefactions, a characteristic of longitudinal waves.<\/p>\n\n\n\n

95. Which physical quantity is responsible for the loudness of sound?<\/mark><\/strong>
a) Frequency
b) Amplitude
c) Velocity
d) Wavelength
Answer:<\/strong> b) Amplitude
Explanation:<\/strong> Larger amplitude corresponds to greater loudness.<\/p>\n\n\n\n

96. When a sound wave moves from air to water, its frequency:<\/mark><\/strong>
a) Increases
b) Decreases
c) Remains same
d) Becomes zero
Answer:<\/strong> c) Remains same
Explanation:<\/strong> Frequency is determined by the source and remains constant across media.<\/p>\n\n\n\n

97. Which part of the ear amplifies sound?<\/mark><\/strong>
a) Cochlea
b) Ossicles
c) Eustachian tube
d) Auditory nerve
Answer:<\/strong> b) Ossicles
Explanation:<\/strong> Ossicles amplify vibrations from eardrum to cochlea.<\/p>\n\n\n\n

98. The speed of sound in air at 20\u00b0C is approximately:<\/mark><\/strong>
a) 331 m\/s
b) 343 m\/s
c) 300 m\/s
d) 350 m\/s
Answer:<\/strong> b) 343 m\/s
Explanation:<\/strong> Speed of sound at 20\u00b0C is about 343 m\/s.<\/p>\n\n\n\n

99. The number of vibrations per second is called:<\/mark><\/strong>
a) Amplitude
b) Frequency
c) Wavelength
d) Time period
Answer:<\/strong> b) Frequency
Explanation:<\/strong> Frequency is the number of cycles per second (Hz).<\/p>\n\n\n\n

100. The characteristic of sound that depends on frequency is called:<\/mark><\/strong>
a) Loudness
b) Pitch
c) Intensity
d) Quality
Answer:<\/strong> b) Pitch
Explanation:<\/strong> Pitch depends on frequency; higher frequency means higher pitch.<\/p>\n","protected":false},"excerpt":{"rendered":"

1. What is the nature of sound waves?a) Transverseb) Longitudinalc) Electromagneticd) None of the aboveAnswer: b) LongitudinalExplanation: Sound waves propagate by compressions and rarefactions in the medium, which is characteristic of longitudinal waves. 2. The speed of sound is maximum in which medium?a) Airb) Waterc) Steeld) VacuumAnswer: c) SteelExplanation: Sound travels fastest in solids because<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,8],"tags":[15520,15481,15512,15503,15509,15510,15515,15465,15518,15511,15516,15479,15474,15467,15483,15472,15456,15508,15513,15478,15507,15514,15521,15519,15517,15505,15506,15469,15504,15480],"class_list":{"0":"post-12433","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-blog","7":"category-physics","8":"tag-acoustics","9":"tag-competitive-exam-physics","10":"tag-doppler-effect","11":"tag-echo-and-reverberation","12":"tag-infrasound","13":"tag-longitudinal-waves","14":"tag-loudness-and-amplitude","15":"tag-mcqs-for-physics-exam","16":"tag-musical-sound","17":"tag-nature-of-sound","18":"tag-noise","19":"tag-physics-learning","20":"tag-physics-mcqs","21":"tag-physics-preparation-material","22":"tag-physics-questions-and-answers","23":"tag-physics-quiz","24":"tag-physics-study-material","25":"tag-pitch-and-frequency","26":"tag-properties-of-sound","27":"tag-psc-physics-mcqs","28":"tag-reflection-of-sound","29":"tag-resonance","30":"tag-sound-experiments","31":"tag-sound-formulas","32":"tag-sound-in-physics","33":"tag-sound-waves","34":"tag-speed-of-sound","35":"tag-ssc-physics-mcqs","36":"tag-ultrasound","37":"tag-upsc-physics-mcqs"},"_links":{"self":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/12433","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/comments?post=12433"}],"version-history":[{"count":9,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/12433\/revisions"}],"predecessor-version":[{"id":13039,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/posts\/12433\/revisions\/13039"}],"wp:attachment":[{"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/media?parent=12433"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/categories?post=12433"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mcqsadda.com\/index.php\/wp-json\/wp\/v2\/tags?post=12433"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}