Measurement of Noise MCQs
Measurement of Noise MCQs
These Measurement of Noise multiple-choice questions and their answers will help you strengthen your grip on the subject of X. You can prepare for an upcoming exam or job interview with these Measurement of Noise MCQs.
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1: What is the term for frequency filters that adjust the amplitude of all parts of the frequency spectrum of the sound or vibration?
A. Frequency weightings
B. Frequency prediction
C. Frequency amplitudes
D. Frequency measurements
2: What does "A" weighting filter do?
A. There is no such thing as an
B. A weighting filter only applies to low levels of sound
C. A weighting filter is only used for environmental sounds
D. A weighting filter most closely matches how humans perceive sound
3: What is C-Weighting used for?
A. Evaluation of environmental sounds
B. Evaluation of equipment sounds
C. Evaluation of human sounds
D. Evaluation of animal sounds
4: What does flat weighting indicate?
A. The IEC 61672 standard was created.
B. No filter was applied, across a stated frequency range.
C. Z-weighting was used.
D. A filter was applied, across a stated frequency range.
5: What did flat weighting indicate?
A. That a filter was applied, not across a stated frequency range.
B. That no filter was applied, not across a stated frequency range.
C. That a filter was applied, across a stated frequency range.
D. That no filter was applied, across a stated frequency range.
6: What is absorption?
A. The changing of sound energy to heat.
B. The transmission of sound waves.
C. The refraction of sound waves.
D. The reflection of sound waves.
7: What is the absorption coefficient?
A. The fraction of sound energy that is absorbed at any surface.
B. The reflection of sound off a surface.
C. The transmission of sound through a medium.
D. The speed of sound in a medium.
8: What is the value of the absorption coefficient of a perfect absorber?
A. 0.5
B. 0
C. 1
D. 0.75
9: What is acoustics?
A. The study of the properties of matter
B. The study of light
C. The science of sound
D. The study of waves and oscillations
10: What is the study of sound waves called?
A. Radiology
B. Cardiology
C. Astrology
D. Acoustics
11: What is an acoustic calibrator?
A. A reference noise source used to calibrate and check the performance of a sound level meter.
B. A device that records sound waves.
C. A type of microphone
D. A machine that alters the pitch of sounds.
12: What is an acoustic fingerprint?
A. A system that allows for the equalization of audio recordings.
B. A system that allows for the enhancement of audio recordings.
C. A system that allows triggers to be set up to start and stop audio recordings and markers.
D. A system that allows for the removal of background noise in audio recordings.
13: What does an Acoustic Fingerprint do?
A. Tracks a person's movements through a building.
B. Monitors the decisions made by a company's board of directors.
C. Keeps track of how often a person visits a website.
D. Allows triggers to be set up to start and stop audio recordings and markers.
14: What is the main purpose of acoustic treatment?
A. To make a space more reverberant
B. To produce noise or vibration
C. To isolate noise or vibration and to correct acoustical faults in spaces
D. To create a soundproof room
15: Which of the following is NOT a unit used to measure ambient noise?
A. L95
B. DB(A)
C. L99
D. L90
16: The metric most often used in the United Kingdom to describe ambient noise is _____.
A. L50
B. L95
C. L60
D. L90
17: What is the main purpose of an anechoic chamber?
A. To increase the reverberation time
B. To measure the speed of sound
C. To measure sound absorption
D. To suppress internal sound reflections
18: What is an anechoic chamber used for?
A. Soundproofing a room
B. Acoustical measurements
C. Determining the speed of sound
D. Measuring the wavelength of a sound wave
19: Which organization sets USA standards?
A. International Electrotechnical Commission
B. United States Standards Institute
C. American Standards Association
D. American National Standards Institute
20: What does the word "attenuate" mean?
A. To reduce the level of an acoustical signal
B. To make an acoustical signal higher-pitched
C. To make an acoustical signal softer
D. To make an acoustical signal louder
21: For Health and Safety work, what is the spectrum of interest usually quoted?
A. 15Hz to 25kHz
B. 20Hz to 20kHz
C. 30Hz to 7kHz
D. 31,5Hz to 8kHz
22: What is the conventionally accepted audio spectrum perceived by the human ear?
A. 20Hz to 18kHz
B. 20Hz to 20kHz
C. 5Hz to 20kHz
D. 15Hz to 25kHz
23: What are the components of the human hearing system?
A. Inner ear
B. The external ear, the middle ear, the inner ear, the nerve pathways and the brain.
C. Middle ear
D. External ear
24: What does the term "Bass" refer to in music?
A. The middle range of audible frequencies
B. Higher range of audible frequencies
C. The range of frequencies inaudible to the human ear
D. Lower range of audible frequencies
25: What is the term for the lower range of audible frequencies?
A. Alto
B. Treble
C. Middle
D. Bass
26: What does the bel unit express?
A. The ratio of the powers
B. The logarithm to the base 10 of the ratio of the powers
C. The logarithm to the base 2 of the ratio of the powers
D. The relative magnitudes of two powers
27: What is the term for noise measurements which include all the audible noise?
A. DB(A)
B. Audible noise
C. Broadband
D. DB(C)
28: What does broadband refer to in noise measurements?
A. The lowest frequency in a range
B. A range of frequencies
C. Noise measurements using parameters which include all the audible noise such as dB(A) and dB(C)
D. The highest frequency in a range
29: What does LCeq-LAeq refer to?
A. The frequency of sound waves.
B. The LCeq-LAeq value over a measurement period.
C. The required level of hearing protection.
D. The machine used to measure the LCeq-LAeq value.
30: What is the LCeq-LAeq value?
A. The LCeq-LAeq value is the average noise level over a measurement period.
B. The LCeq-LAeq value is the noise level over a measurement period.
C. The LCeq-LAeq value is the loudest noise level over a measurement period.
D. The LCeq-LAeq value is the sound level over a measurement period.
31: What is the process of measuring to determine the accuracy of your measurement chain called?
A. Measuring
B. Determining
C. Calibration
D. Noise
32: What is the process of Calibration?
A. The process of owning a sound meter
B. The process of measuring to determine the accuracy of your measurement chain.
C. The process of fixing your noise meter
D. The process of setting your dosemeter
33: What is the difference between the expected calibration level set in the instrument and the level measured by the instrument during calibration?
A. The difference is called the calibration offset.
B. The difference is called the calibration error.
C. The difference is unimportant.
D. There is no difference.
34: What is the condition for a coincidence to occur?
A. When the amplitude of the incident sound wave projected onto a surface matches the bending amplitude of that surface.
B. When the wavelength of the incident sound wave projected onto a surface matches the bending wavelength of that surface.
C. When the wavelength of the incident light wave projected onto a surface matches the bending wavelength of that surface.
D. When the frequency of the incident sound wave projected onto a surface matches the bending frequency of that surface.
35: Which of the following is NOT a performance category of a sound level meter?
A. Class 1
B. Type 2
C. Type 1
D. Class 2
36: IEC 61672 divides sound level meters into which classes?
A. 2 classes
B. 5 classes
C. 7 classes
D. 3 classes
37: What does critical frequency refer to?
A. Highest frequency when coincidence occurs.
B. Lowest frequency when coincidence occurs.
C. Frequency that produces the least sound.
D. Frequency that produces the loudest sound.
38: What is critical frequency?
A. Highest frequency when beats occur
B. Lowest frequency when beats occur
C. Lowest frequency when coincidence occurs
D. None of the above
39: What is the maximum Leq sound level allowed over an 8 hour time period which corresponds to the 100% dose in the UK?
A. 85dB
B. 86dB
C. 88dB
D. 84dB
40: What is the Criterion Time?
A. The lowest permissible exposure to noise
B. The maximum permissible exposure to noise
C. The time over which noise meters calculate exposure and dose values.
D. The recommended exposure to noise
41: What is the definition of cycle?
A. The sequence of changes which takes place during the period of a fixed quantity.
B. The sequence of changes which takes place during the period of a non-recurring variable quantity.
C. The sequence of changes which takes place during the period of a quantity.
D. The sequence of changes which takes place during the period of a recurring variable quantity.
42: What is the "metric" that a sound level meter gives when on A-frequency-weighting network?
A. DB(C)
B. DB(F)
C. DB(A)
D. DB(Z)
43: What is the process whereby the amplitude of an oscillation of a system is diminished due to thermodynamically or other irreversible processes called?
A. Resonance
B. Damping
C. Amplification
D. Oscillation
44: What is the 8 hour average level of noise exposure calculated from the percentage dose written as?
A. Percentage dose
B. LEP,8h
C. LEP,d or LEX,8h
D. LEX,8h
45: What does LEP,d represent?
A. Level of Exposure to Noise
B. Daily Personal Noise Exposure
C. Light Exposure Protection
D. Loudness Exposure Percentage
46: Decibel and Bel are which of the following?
A. Imperial units
B. Not units
C. SI units
D. Wraps
47: What is the symbol for decibel?
A. DBP
B. DB
C. DBA
D. DBm
48: What is a diaphragm?
A. A measure of the loudness of sound
B. Any surface that vibrates in response to sound or is vibrated to emit sound
C. The study of sound and its propagation
D. A device used to clean water
49: What is the ability of a sound wave to pass round a screen or barrier called?
A. Diffusion
B. Reflection
C. Refraction
D. Diffraction
50: What is the definition of Diffusion?
A. The movement of particles from an area of high concentration to an area of low concentration.
B. The absorption of sound waves by a surface.
C. The reflection of sound waves off a surface.
D. When reflecting surface or surfaces cause a dispersion of sound in a room, with no directionality of sound waves.
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