Sound Insulation MCQ
1. What is the law in which sound levels falls inversely proportional to the square of the distance from the source?
Answer
Correct Answer:
Inverse Square Law
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2. What does the term "inverse square law" mean in acoustics?
Answer
Correct Answer:
The sound level falls inversely proportional to the square of the distance from the source.
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3. What is the purpose of soundproofing?
Answer
Correct Answer:
To make structures more impervious to sound transmission
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4. What is SPL?
Answer
Correct Answer:
SOUND PRESSURE LEVEL
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5. What is the unit of measurement for SPL?
Answer
Correct Answer:
Decibels (dB)
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6. SOUND PRESSURE is the difference between the _____ of a sound wave and the static atmospheric pressure.
Answer
Correct Answer:
Instantaneous pressure
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7. What is a sound level meter used for?
Answer
Correct Answer:
To measure sound levels or noises at different frequencies.
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8. What is a subjective measure of sound called?
Answer
Correct Answer:
Sound Level
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9. What is a sound barrier?
Answer
Correct Answer:
Any material or structure that impedes the transmission of noise beyond it
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10. What is the Sound Absorption Coefficient?
Answer
Correct Answer:
The amount of sound energy absorbed by a given material.
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11. What is the definition of sound absorption?
Answer
Correct Answer:
The property of materials such as air, walls or acoustic panels that changes sound wave energy into heat energy.
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12. What is the property of materials that changes sound wave energy into heat energy?
Answer
Correct Answer:
Sound absorption
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13. What is the average speed of sound at sea level and 20ºC?
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14. What does SINE WAVE stand for?
Answer
Correct Answer:
A continuous uniform (sound) wave having a constant amplitude and frequency.
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15. What does a higher signal to noise ratio mean?
Answer
Correct Answer:
The lower the background or unwanted noise interferes with the desired signal.
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16. What is a Septum?
Answer
Correct Answer:
A thin layer of material that helps prevent sound waves from passing through an absorptive material.
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17. What is the value of 1 metric Sabin?
Answer
Correct Answer:
1 square meter of 100% absorbing material
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18. What does SABIN stand for?
Answer
Correct Answer:
Sound Absorption of a room or acoustic material
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19. REVERBERATION TIME is commonly referred to as what?
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20. What is the name for the continuation of sound wave energy in an enclosed space after the original sound source has stopped?
Answer
Correct Answer:
Reverberation
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21. What is the definition of reverberation?
Answer
Correct Answer:
The perpetuation of sound wave energy in an enclosed space after the original sound source has stopped.
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22. What is the definition of a resonant frequency?
Answer
Correct Answer:
A frequency at which a resonance exists.
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23. What is a frequency at which a resonance exists called?
Answer
Correct Answer:
RESONANT FREQUENCY
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24. What is the frequency at which the entire partition or wall assembly resonates?
Answer
Correct Answer:
This frequency is dependent on cavity depth, insulation, mass, etc.
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25. What is the natural frequency of vibration of an object called?
Answer
Correct Answer:
Resonance frequency
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26. What is the definition of resonance?
Answer
Correct Answer:
The reinforcement of a partition vibrating at resonance.
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27. What is sound reflection?
Answer
Correct Answer:
Sound wave energy that strikes and bounces off a surface through which it cannot pass.
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28. What is the term for sound wave energy that strikes and bounces off a surface through which it cannot pass?
Answer
Correct Answer:
Reflection
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29. What is an open plenum used for in buildings?
Answer
Correct Answer:
Electrical and HVAC purposes
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30. What is the unit for sound frequency?
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31. What is 1 Phon equal to at a frequency of 1000 Hz?
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32. What is the unit measurement of perceived sound or loudness?
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33. What is the range for OITC?
Answer
Correct Answer:
80 Hz to 4000 Hz
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34. What does OITC stand for?
Answer
Correct Answer:
Outdoor Indoor Transmission Class
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35. What does 1/3 OCTAVE BANDS mean?
Answer
Correct Answer:
Each of the Octave Bands are split into three
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36. What is the interval between two discrete frequencies called?
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37. What does an NRC of 1 indicate?
Answer
Correct Answer:
Perfect absorption
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38. NR is used to determine the reduction of SPL caused by what?
Answer
Correct Answer:
An absorbent material
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39. What does NIC stand for?
Answer
Correct Answer:
Noise Isolation Class
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40. What does NC stand for in Noise Criteria?
Answer
Correct Answer:
Noise Criteria
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41. What is the definition of noise?
Answer
Correct Answer:
Any sound in the acoustic domain both wanted and unwanted
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42. What is noise described as in the acoustic domain?
Answer
Correct Answer:
Any sound in the acoustic domain, both wanted and unwanted.
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43. If you were to double the mass of an existing wall, the TL would improve by:
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44. If you were to add an additional sheet of drywall to an existing wall, what would be the effect on the sound transmission loss?
Answer
Correct Answer:
No effect
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45. For every doubling of mass, there is a _____ improvement of transmission loss.
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46. What is the transmission loss of a material?
Answer
Correct Answer:
The amount of sound that a material can stop
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47. What is the weight of a given material in a given volume?
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48. What is the most common type of masking?
Answer
Correct Answer:
"White noise" or "pink noise"
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49. What is the most common type of noise masking?
Answer
Correct Answer:
"White noise"
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50. What is the unit of measurement for loudness?
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51. What is loudness dependent on?
Answer
Correct Answer:
Sound pressure, intensity, and frequency
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52. What is the purpose of having a LIVE END / DEAD END in a performance space?
Answer
Correct Answer:
The DEAD END allows the performer to hear the purest sound produced.
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53. What is the DEAD END in an acoustical treatment plan?
Answer
Correct Answer:
The stage
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54. What is an example of an impact sound?
Answer
Correct Answer:
Footsteps
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55. What is the definition of "IMPACT SOUND"?
Answer
Correct Answer:
Sound generated by the collision of two solid objects and carried through a structure.
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56. What is the unit of frequency?
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57. How high can the highest frequency an average middle aged person hear be?
Answer
Correct Answer:
12,000-14,000 Hz
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58. What is the hearing range for human speech?
Answer
Correct Answer:
600 Hz to 4800 Hz
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59. What is hearing impairment?
Answer
Correct Answer:
Any degree, full or partial, of impairment of the ability to apprehend sound.
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60. Environments with what make it harder for those with hearing loss to understand conversation?
Answer
Correct Answer:
Longer reverberation times
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61. What is a sound composed of?
Answer
Correct Answer:
A sound is composed of multiple frequencies.
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62. What is the main purpose of frequency analysis?
Answer
Correct Answer:
To determine the volume of sounds at various frequencies that make up the overall sound’s spectrum.
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63. What is the unit used to measure acoustic frequency?
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64. What is the SI unit of frequency?
Answer
Correct Answer:
Hertz (Hz)
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65. What is meant by a "free field?"
Answer
Correct Answer:
A sound environment that is free from all bounding surfaces or obstructions.
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66. What is the full form of STC?
Answer
Correct Answer:
Sound Transmission Class
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67. Flanking noise is caused by _____________
Answer
Correct Answer:
Indirect path of sound transmission traveling around a partition or barrier
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68. What is the measure of sound pressure over the frequency spectrum represented by curves on a graph called?
Answer
Correct Answer:
Equal Loudness Contours
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69. How can echo flutters be controlled?
Answer
Correct Answer:
With diffusers and sound absorbing products.
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70. What is the minimum delay required for an echo to be heard?
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71. What is the definition of diffusion?
Answer
Correct Answer:
The scattering or random reflection of a sound wave from a surface.
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72. What is the definition of a "deflection"?
Answer
Correct Answer:
The distance an elastic body or spring moves when subjected to a static or dynamic force
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73. What is the threshold of pain for the human ear in decibels?
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74. What is a decibel?
Answer
Correct Answer:
A logarithmic unit used to express the difference or magnitude of the level or power of sound intensity.
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75. What does DAMPING refer to?
Answer
Correct Answer:
The process by which vibrations are converted into heat over time and distance.
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76. What is the unit of measure for cycles per second?
Answer
Correct Answer:
One second
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77. What is the definition of cycles per second?
Answer
Correct Answer:
The number of oscillations (cycles) that occur in the time frame of one second.
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78. What is the cycle in acoustics?
Answer
Correct Answer:
The complete oscillation of a sound wave's pressure above and below the atmospheric static pressure
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79. What is the full oscillation of a sound wave's pressure called?
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80. What are the constraining layers in CLD?
Answer
Correct Answer:
Rigid layers like drywall or plywood
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81. What are the two layers found in constrained layer damping?
Answer
Correct Answer:
Viscoelastic damping compound and stiff layers
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82. What is the name for the region where the speed of the wave is equal to the speed of sound in air?
Answer
Correct Answer:
Coincidence Region
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83. What is the cocktail party effect?
Answer
Correct Answer:
The ability to focus one’s listening attention on a single talker among a mixture of conversations and background noises
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84. What is a cloud?
Answer
Correct Answer:
An acoustical panel suspended in a horizontal position from a ceiling or roof structure.
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85. CLOUD refers to an acoustical panel suspended in a vertical position from a ceiling or roof structure.
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86. What does BOOMINESS refer to?
Answer
Correct Answer:
Low frequency reflections
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87. What is the range of frequencies that a bass trap can absorb?
Answer
Correct Answer:
Sound at low frequencies less that about 100 hertz (Hz)
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88. What is the main purpose of a bass trap?
Answer
Correct Answer:
To absorb sound at low frequencies
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89. What is the definition of BARRIER?
Answer
Correct Answer:
Anything physical or an environment that interferes with communication or listening
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90. What does BAFFLE stand for?
Answer
Correct Answer:
An acoustical sound absorbing unit.
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91. What is the purpose of a baffle?
Answer
Correct Answer:
To reduce reverberation and noise levels
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92. What is the sum total of all unwanted residual noise generated from all direct and reflected sound sources in a space called?
Answer
Correct Answer:
Background noise
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93. What is the main reason for the increase in efficiency of absorption?
Answer
Correct Answer:
More surface area on an acoustical panel
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94. Why does having acoustical materials spaced apart increase absorption?
Answer
Correct Answer:
More surface area on an acoustical panel, diffraction around the panels, and air space
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95. What does the ARTICULATION INDEX measure?
Answer
Correct Answer:
Intelligibility of the spoken word in a sentence from 0 to 100%.
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96. The ARTICULATION INDEX is a measure of which of the following?
Answer
Correct Answer:
Speech intelligibility
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97. What is the difference between AC and NIC?
Answer
Correct Answer:
AC values increase with increasing privacy, while NIC is based on hearing sensitivity.
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98. What does AC stand for?
Answer
Correct Answer:
Articulation Class
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99. What is the main purpose of Architectural Acoustics?
Answer
Correct Answer:
The control of noise in a building space
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100. AMPLITUDE is the nonnegative scaler measurement of what during a frequency cycle?
Answer
Correct Answer:
A sound wave's peak magnitude
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101. What is the AMPLITUDE?
Answer
Correct Answer:
The nonnegative scaler measurement of a sound wave’s peak magnitude during a frequency cycle or peak pressure variation.
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102. What are the two main types of noise?
Answer
Correct Answer:
Traffic and HVAC
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103. What is AIRBORNE SOUND?
Answer
Correct Answer:
Sound that reaches the point of interest by traveling through the air.
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104. What does the acoustical environment refer to?
Answer
Correct Answer:
The acoustical characteristics of a space or room
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105. What is an Acoustical Consultant?
Answer
Correct Answer:
A professional who is experienced in providing advice on acoustical requirements, and noise control in a variety of situations.
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106. What is the purpose of an acoustical analysis?
Answer
Correct Answer:
To determine the level of reverberation or reflected sound in a space
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107. What does the adjective form of acoustical mean?
Answer
Correct Answer:
The properties of a material to absorb or reflect sound
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108. What does the word "acoustical" mean?
Answer
Correct Answer:
The properties of a material to absorb or reflect sound (adjective)
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109. What does the study of acoustics involve?
Answer
Correct Answer:
The scientific study of sound, its production, transmission, and effects.
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110. What is the scientific study of sound called?
Answer
Correct Answer:
Acoustics
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Acoustical Engineering MCQs | Topic-wise