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Advanced Engineering Acoustics MCQ

1. What does any positive number of dB mean?

Less than the reference

Greater than the reference

Zero

The same as the reference

Answer

Correct Answer: Greater than the reference

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2. What does dB stand for?

Degree bounded

Decibel

Decibels above

Density body

Answer

Correct Answer: Decibel

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3. What does 0 dB mean?

Increased sound level

Decreased sound level

No sound

The same as the reference

Answer

Correct Answer: The same as the reference

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4. What is the relative sound pressure level (dB SPL)?

20 x log (px/20uPa)

20/log (px/20uPa)

2 x log (px/20uPa)

Log (px/20uPa)

Answer

Correct Answer: 20 x log (px/20uPa)

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5. What is the relative sound pressure level when the sound pressure is px = 60Pa?

126 dB

6 dB

36 dB

96 dB

Answer

Correct Answer: 126 dB

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6. What is the term for expressing the intensity of sound Relative to the smallest intensity we can hear?

Decibel

Sone

Relative sound intensity

Phon

Answer

Correct Answer: Relative sound intensity

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7. What is the biggest advantage of using a logarithmic scale to express sound intensity?

It expresses intensity on a scale from 0 to 10

It is more accurate

There is no advantage

It is easier to compare different intensities

Answer

Correct Answer: It is easier to compare different intensities

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8. Which of the following is true about the relationship between sound pressure level and intensity?

Intensity is proportional to sound pressure.

There is no relationship between sound pressure level and intensity.

Intensity is proportional to sound pressure squared.

Intensity is inversely proportional to sound pressure.

Answer

Correct Answer: Intensity is proportional to sound pressure squared.

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9. Under what conditions is the sound pressure level measured?

Reverberation room

Anechoic chamber

Standardized conditions

Open field test

Answer

Correct Answer: Standardized conditions

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10. What is the unit for sound pressure?

GPa

MPa

UPa

Answer

Correct Answer: Pa

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11. What is the absolute sound intensity?

The softest sound a person can hear

A factor of one trillion difference in intensity between the quietest audible sound and the loudest bearable sound

The loudest sound a person can hear

The decibel scale for sound

Answer

Correct Answer: A factor of one trillion difference in intensity between the quietest audible sound and the loudest bearable sound

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12. How big is the difference in intensity between the quietest and loudest audible sound?

A factor of ten

A factor of one billion

A factor of one million

A factor of one trillion

Answer

Correct Answer: A factor of one trillion

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13. What does intensity depend on?

The frequency and wavelength of the wave.

The speed and wavelength of the wave.

The area and the duration in which the wave propagates.

The height and width of the wave.

Answer

Correct Answer: The area and the duration in which the wave propagates.

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14. What is the formula for absolute sound intensity?

I = P * (4 * pi * r^2)

I = P * C

I = P / (4 * pi * r^2)

I = P / C

Answer

Correct Answer: I = P / (4 * pi * r^2)

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15. What is the logarithm of 100?

1/2

-2

Answer

Correct Answer: 2

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16. What is the value of cos(theta)?

Theta

Zero

-1

Answer

Correct Answer: Zero

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17. What is the value of pi to the nearest tenth?

3.2

3.3

3.1

3.4

Answer

Correct Answer: 3.1

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18. What is the circumference of a 3.14 radius pie?

3.14

9.42

2.72

7.06

Answer

Correct Answer: 9.42

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19. What is a sinusoid?

A sinusoid is a curve that oscillates between a maximum and a minimum value, or vice versa.

A sinusoid is a mathematical function.

A sinusoid is a curve that oscillates between two points.

Sinusoid is the name of a company.

Answer

Correct Answer: A sinusoid is a curve that oscillates between a maximum and a minimum value, or vice versa.

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20. What is the cycle completed when?

It goes 360 degrees.

In a square.

In a rectangle.

It goes 260 degrees.

Answer

Correct Answer: It goes 360 degrees.

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21. What is the pressure at -30 degrees?

Positive pressure

Negative pressure

Equal pressure

No pressure

Answer

Correct Answer: Negative pressure

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22. What is a negative pressure?

An increase in atmospheric pressure

Lower than average atmospheric pressure

A decrease in atmospheric pressure

Higher than average atmospheric pressure

Answer

Correct Answer: A decrease in atmospheric pressure

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23. What does the starting phase of a sine wave tell us?

The wavelength of the sine wave

The frequency of the sine wave

The amplitude of the sine wave

Where the beginning of the sine wave is in degrees.

Answer

Correct Answer: Where the beginning of the sine wave is in degrees.

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24. What is the unit of wavelength?

Kilometer

Centimeter

Mile

Meter

Answer

Correct Answer: Meter

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25. Wavelength is the unit of ___________?

Speed

Distance

Acceleration

Time

Answer

Correct Answer: Distance

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26. What determines the speed of sound wave propagation?

Direction of the wave

Characteristics of the medium

Frequency of the wave

Loudness of the noise

Answer

Correct Answer: Characteristics of the medium

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27. What is the wavelength formula?

Wavelength = propagation speed * frequency

Wavelength = frequency/propagation speed

Wavelength = speed/frequency

Wavelength = propagation speed/frequency

Answer

Correct Answer: Wavelength = propagation speed/frequency

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28. What is the distance from one peak of the wave to the next adjacent peak called?

Frequency

Speed of light

Wave-particle duality

Wavelength

Answer

Correct Answer: Wavelength

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29. What is the history of a single location?

The period

The culture

The land

The people

Answer

Correct Answer: The period

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30. What does a snapshot of a single time describe?

A moment in time

A group of people

A still image

Various locations

Answer

Correct Answer: Various locations

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31. Whats the unit of period?

Wavelength of wave

The reciprocal of frequency

Time the sine wave takes to repeat itself in a second of time.

Wave speed

Answer

Correct Answer: Time the sine wave takes to repeat itself in a second of time.

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32. The shorter the period, the _ the _?

Longer, frequency

Longer, wavelength

Shorter, wavelength

Shorter, frequency

Answer

Correct Answer: Shorter, frequency

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33. Inverse relationship between frequency and wavelength is known as?

Wavelength

Wave velocity

Frequency

Amplitude

Answer

Correct Answer: Wave velocity

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34. The longer the period, the _____ the frequency?

Longer

Equal

Shorter

Answer

Correct Answer: Longer

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35. What is the unit of period?

Meters

Minutes

Seconds

Kilograms

Answer

Correct Answer: Seconds

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36. What is the formula for frequency?

F=1/p

F=1+p

F=p/1

Answer

Correct Answer: F=1/p

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37. What is the equation for frequency?

F=1/p

F=p

F=v/p

Answer

Correct Answer: F=1/p

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38. Special unit name that is used for frequency?

K.F.

M.F.

A.F.

Answer

Correct Answer: Hz

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39. What is a period?

The distance between two successive crests of the wave

The time it takes for the wave to travel one wavelength

The distance between two successive troughs of the wave

The time to complete one cycle of the wave

Answer

Correct Answer: The time to complete one cycle of the wave

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40. What does frequency measure?

The number of seconds it takes to complete one cycle.

The number of cycles that are completed in one second.

The number of hours it takes to complete one cycle.

The number of minutes it takes to complete one cycle.

Answer

Correct Answer: The number of cycles that are completed in one second.

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41. How do sinusoids differ in 3 ways?

Frequency, wavelength, amplitude

Frequency, amplitude, density

Frequency, speed, wavelength

Frequency, amplitude, starting phase

Answer

Correct Answer: Frequency, amplitude, starting phase

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42. How do sinusoids differ in 2 ways?

Frequency, amplitude

Frequency, wavelength

Starting phase, ending phase

Amplitude, loudness

Answer

Correct Answer: Frequency, amplitude

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43. What is happening if you record at a single location?

Analyzing past conditions

Predicting future conditions

Monitoring current conditions

Recording history and what is happening as a function of time

Answer

Correct Answer: Recording history and what is happening as a function of time

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44. What makes up a waveform?

Shows variation of sound pressure as a function of time.

Wavelength and amplitude.

Amplitude and time.

Wavelength and time.

Answer

Correct Answer: Amplitude and time.

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45. What is the name for wave motion where the direction of vibration is parallel to the direction of wave propagation?

Projectile wave motion

Harmonic wave motion

Longitudinal wave motion

Dilatational wave motion

Answer

Correct Answer: Longitudinal wave motion

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46. What is a medium?

Somebody who is in the middle

A device that communicates

The way that energy is carried.

A bargaining chip

Answer

Correct Answer: The way that energy is carried.

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47. What is sound made up of?

Just a

A and b

C and d

Sound source and a medium

Answer

Correct Answer: Sound source and a medium

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48. What is energy?

The ability to think

The ability to move

The ability to feel

The capacity to do work.

Answer

Correct Answer: The capacity to do work.

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49. What is wave propagation?

Movement of energy

Light waves only

Just sound waves

Subatomic particles only

Answer

Correct Answer: Movement of energy

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50. Do air molecules travel to carry sound energy?

Wave propagates

Yes

Energy is being transmitted

Answer

Correct Answer: No

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51. What propagates energy?

Particles

Solids

Waves

Liquids

Answer

Correct Answer: Waves

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52. What is an acoustic signal?

A taste

A sound

A smell

A light

Answer

Correct Answer: A sound

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53. What is the definition of rarefaction?

High pressure; air molecules contract.

Low pressure; air molecules spread out.

Low pressure; air molecules contract.

High pressure; air molecules spread out

Answer

Correct Answer: Low pressure; air molecules spread out.

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54. What causes condensation?

No pressure

Equal pressure

Low pressure

High pressure

Answer

Correct Answer: High pressure

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55. What is sound?

Oscillation of air pressure.

A male given name

Creation of art

A type of energy

Answer

Correct Answer: Oscillation of air pressure.

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56. What is the name for random noise that contains equal noise energy in any fixed width frequency band?

White noise

Pink noise

Brown noise

Static noise

Answer

Correct Answer: White noise

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57. What is Reverberation Time?

The time it takes for sound to decay by 90 decibels after the sound is stopped in the room.

The time it takes for sound to decay by 30 decibels after the sound is stopped in the room.

The time it takes for sound to increase by 60 decibels after the sound is stopped in the room.

The time it takes for sound to decay by 60 decibels after the sound is stopped in the room.

Answer

Correct Answer: The time it takes for sound to decay by 60 decibels after the sound is stopped in the room.

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58. What is STC?

Sound Transmission Capacity

Sound Transmission Count

Sound Transmission Component

Sound Transmission Class

Answer

Correct Answer: Sound Transmission Class

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59. What is Pink Noise?

Random noise that contains equal noise energy in each octave band and each one-third octave band.

A feeling

A color

A type of rock music

Answer

Correct Answer: Random noise that contains equal noise energy in each octave band and each one-third octave band.

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60. What is the L90?

The decibel level that is exceeded 95% of the time.

The decibel level that is exceeded 90% of the time.

The decibel level that is exceeded 80% of the time.

The decibel level that is exceeded 99% of the time

Answer

Correct Answer: The decibel level that is exceeded 90% of the time.

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61. What is one-third octave band?

A band of frequencies that are one-third of an octave apart

A band of frequencies that are one octave apart

A band of frequencies that are two octaves apart

A band of frequencies that are one-half of an octave apart

Answer

Correct Answer: A band of frequencies that are one-third of an octave apart

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62. What is an octave band?

A frequency band that is one octave wide

The highest trombone note

A trombone slide position

A series of eight musical notes spanning an octave

Answer

Correct Answer: A frequency band that is one octave wide

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63. What is the term used for an area where noise interferes with the normal activities and uses of the area?

Restricted Use Area

Environmental Protection Area

Noise Sensitive Area

National Security Area

Answer

Correct Answer: Noise Sensitive Area

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64. What does a higher number in the noise reduction coefficient rating indicate?

No sound absorption

More sound absorption

Less sound absorption

Equal sound absorption

Answer

Correct Answer: More sound absorption

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65. What does NIC stand for?

Noise Insulation Class

Noise Isolation Class

Noise Inhalation Class

Noise Intoxication Class

Answer

Correct Answer: Noise Isolation Class

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66. What does NC stand for?

Natural Criterion

Noise Capacity

Noise Chart

Noise Criterion

Answer

Correct Answer: Noise Criterion

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67. What is the purpose of a noise barrier?

To amplify noise

To reduce noise

To create a soundproof barrier

To protect sensitive areas from unwanted noise

Answer

Correct Answer: To protect sensitive areas from unwanted noise

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68. What does NAC stand for?

Noise Abatement Committee

National Association of Counties

Noise Abatement Council

Noise Abatement Criteria

Answer

Correct Answer: Noise Abatement Criteria

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69. What is noise?

Any unwanted or undesirable sound

A measure of loudness

A type of waves

A unit of sound intensity

Answer

Correct Answer: Any unwanted or undesirable sound

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70. What does LEQ (night) stand for?

Level Effective Sounding Long

Nighttime Equivalent Sound Level

Low Equivalent Sounding

Loudness Equivalent Sound Level

Answer

Correct Answer: Nighttime Equivalent Sound Level

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71. What does NEPA stand for?

National Environmental Policy Act

National Energy Policy Act

North East Protective Agency

National Economic Planning Authority

Answer

Correct Answer: National Environmental Policy Act

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72. What does LMIN stand for?

Loudness Sound Level

Medium Sound Level

Maximum Sound Level

Minimum Sound Level

Answer

Correct Answer: Minimum Sound Level

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73. What does LMAX stand for?

Minimum Sound Level

Maximum Sound Level

Mean Sound Level

Maximum Speech Level

Answer

Correct Answer: Maximum Sound Level

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74. What is masking sound?

A sound that is natural

A sound that is wanted

A sound that is artificial

Sound that is introduced into an environment to cover up an unwanted sound

Answer

Correct Answer: Sound that is introduced into an environment to cover up an unwanted sound

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75. What is the Inverse Square Law?

The sound pressure varies inversely with the square of the distance from the source

The sound pressure decreases by 3 dB for each doubling of the distance from the source

Both of above

None of these

Answer

Correct Answer: The sound pressure varies inversely with the square of the distance from the source

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76. Reduction in sound level at a given location due to the insertion of a noise control device is known as ________?

Reduction in Noise

Insertion Loss

Noise Control

Noise Cancellation

Answer

Correct Answer: Insertion Loss

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77. What is the IIC?

Impact Insulator Class

Impulse Insulation Class

Impulse Insulator Class

Impact Insulation Class

Answer

Correct Answer: Impact Insulation Class

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78. What is the unit used to express the number of cycles per second of a periodic wave?

Seconds (s)

Hertz (Hz)

Joules (J)

Farads (F)

Answer

Correct Answer: Hertz (Hz)

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79. What does Hz stand for?

Hours

Henry

Hertz

Hectares

Answer

Correct Answer: Hertz

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80. What is a flanking path?

A direct sound transmission path that bypasses the primary wall or other barrier

The primary wall or other barrier itself

An indirect sound transmission path that bypasses the primary wall or other barrier

A structure borne path through the floor or ceiling

Answer

Correct Answer: An indirect sound transmission path that bypasses the primary wall or other barrier

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81. What does FSTC stand for?

Field Sound Transmission Class

Field Sound Transmission Classifier

Field Sound Transmission Code

Sound Transmission Class

Answer

Correct Answer: Field Sound Transmission Class

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82. What is FIIC?

Field Impact Insulation Class

Frequency Induced Insulation Class

Fast Impulse Insulation Class

Field Induced Insulation Class

Answer

Correct Answer: Field Impact Insulation Class

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83. What does FHWA stand for?

Federal Highway Agreement

Federal Highway Administration

Federal Highway Association

Federal Highway Act

Answer

Correct Answer: Federal Highway Administration

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84. What does HVAC stand for?

Heating, ventilation, and air conditioning

High velocity air conditioning

Horizontal venting and air conditioning

High voltage alternating current

Answer

Correct Answer: Heating, ventilation, and air conditioning

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85. What is a decibel?

A measure of loudness

A unit of sound measurement

The speed of sound

A logarithmic unit of sound measurement

Answer

Correct Answer: A logarithmic unit of sound measurement

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86. What is a "dead" room?

A room with a long reverberation time.

A room with many sound reflecting surfaces.

A room that is not very reverberant.

A room with few sound absorbing surfaces

Answer

Correct Answer: A room that is not very reverberant.

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87. What is the main characteristic of a "dead" room?

It has many sound absorbing surfaces

It is very reverberant

It has a long reverberation time

It has a short reverberation time

Answer

Correct Answer: It has a short reverberation time

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88. What is the acronym for Daytime Equivalent Sound Level?

DESL

DASL

Leq

ELSD

Answer

Correct Answer: Leq

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89. What is the unit of measurement for Daytime Equivalent Sound Level?

Pascal

Coulombs/meter3

Watts/meter2

Decibels (dB)

Answer

Correct Answer: Decibels (dB)

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90. What is the penalty for nighttime levels?

15 dB

5 dB

20 dB

10 dB

Answer

Correct Answer: 10 dB

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91. What is the characteristic of a mechanical system that gradually reduces the amplitude of vibration?

Damping

Friction

Inertia

Elasticity

Answer

Correct Answer: Damping

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92. What does the CNEL stand for?

Community Noise Exposure Level

Continuous Noise Equivalent Level

Community Noise Exposure Limit

Community Noise Equivalent Level

Answer

Correct Answer: Community Noise Equivalent Level

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93. What does CAC stand for?

Cannot Acquire Contract

Ceiling Attenuation Class

Continuous Airspace Control

Cookie Allergy Class

Answer

Correct Answer: Ceiling Attenuation Class

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94. What is the term for sounds from sources other than the sound source of interest?

Background sound

Reverberation

Sound shadowing

Sound diffraction

Answer

Correct Answer: Background sound

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95. What does the A in dBA stand for?

Average

Absolute

A-weighted

Amplitude

Answer

Correct Answer: A-weighted

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96. What does A-weighted Sound Level measure?

Broadband sound spectrum

Frequency of sound

Loudness of sound

Wavelength of sound

Answer

Correct Answer: Broadband sound spectrum

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97. What does ASTC stand for?

Audio Sound Transmission Class

Sound Transmission Class

Apparent Sound Transmission Rating

Apparent Sound Transmission Class

Answer

Correct Answer: Apparent Sound Transmission Class

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98. What is Ambient Sound?

Music composed for a particular film or video game

The sound of waterfalls

Include only the sound source of interest

All sounds that exist in a particular area, from near and far, including the sound source of interest

Answer

Correct Answer: All sounds that exist in a particular area, from near and far, including the sound source of interest

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99. What is airborne sound?

Transmission of sound through medium other than air

Sound that arrives at the point of interest by transmission through air.

Sound that arrives at the point of interest without being transmitted

Sound that arrives at the point of interest by transmission through solid objects

Answer

Correct Answer: Sound that arrives at the point of interest by transmission through air.

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100. What is the science of mechanical waves that deals with the generation, transmission, and effects of waves including vibration, sound and ultrasound called?

Mathematics

Acoustics

Chemistry

Science

Answer

Correct Answer: Acoustics

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101. What is an acoustic camera used for?

To measure sound

To take pictures

To identify and locate sound sources by visualizing the sound produced.

To listen to music

Answer

Correct Answer: To identify and locate sound sources by visualizing the sound produced.

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102. What does Absorption Coefficient (a) indicate?

How much sound is absorbed by the material

How loud the sound is

How much sound is transmitted by the material

How much sound is reflected by the material

Answer

Correct Answer: How much sound is absorbed by the material

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103. What is an accelerometer?

A device that measures acceleration

A transducer whose output is directly proportional to acceleration.

A device that produces electric current in response to acceleration

A unit of measurement for acceleration

Answer

Correct Answer: A transducer whose output is directly proportional to acceleration.

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