Noise Control MCQs (Acoustical Engineering)
Noise Control MCQs (Acoustical Engineering)
Try to answer these Noise Control MCQs and check your understanding of the Noise Control subject.
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1: What does absorption do to sound energy?
A. Destroys sound energy
B. Produces sound energy
C. Reduces the amount of sound energy reflected
D. Increases the amount of sound energy reflected
2: What is the science of sound called?
A. Acoustics
B. Logarithms
C. Amplitude
D. Sine
3: What does the term "acoustic trauma" usually imply?
A. A single traumatic event
B. Long-term exposure to loud noise
C. Gradual hearing loss caused by aging
D. Hearing loss caused by disease
4: What is AIRBORNE SOUND?
A. Sound that is too loud
B. Sound that reaches the point of interest by propagation through air.
C. Quiet sound
D. Sound that is not directional
5: What is the total of all noise in the environment called?
A. Noise Abatement
B. Ambient Noise
C. Soundproofing
D. International Noise
6: What is the main purpose of an anechoic room?
A. To create free field conditions
B. To create Echo
C. To reflect sound
D. To absorb sound
7: What does ANSI stand for?
A. American National Society of Interpreters
B. American Nurses Syndicate International
C. American National Standards Institute
D. Association of National Stenographers and Interpreters
8: What does the acronym "ANSI" stand for?
A. American Native Species Initiative
B. American National Security Initiative
C. The American National Standards Institute
D. American National Society of Interpreters
9: What is the range of the articulation index?
A. 1.0 to 6.0
B. 0 to 1.0
C. -1.0 to 1.0
D. 0 to 10
10: What is the range of the AI?
A. Between 0 and 1.0
B. -1 to 1
C. 1-10
D. 0-100
11: What is the total of all noise in a system or situation, independent of the presence of the desired signal called?
A. Electrical noise
B. Source of interest
C. Noise in the environment
D. Background noise
12: What is the meaning of the term "background noise"?
A. The total of all noise in a system or situation, independent of the presence of the desired signal.
B. The noise in the environment, other than the noise from the source of interest.
C. The total of all noise in the environment.
D. The noise in the measurement system.
13: What does BAND stand for?
A. Balanced Audio Network Design
B. Berlin Area Network of Devices
C. Broadcast Audio Newscast Digital
D. Any segment of the frequency spectrum.
14: What is the lower cutoff frequency of a band pass filter?
A. Less than zero
B. Greater than zero
C. Finite upper cutoff frequency
D. Equal to zero
15: What is BROADBAND NOISE?
A. A device that broadens the bandwidth of a signal
B. Noise with components over a wide range of frequencies
C. A term used in electrical engineering
D. Noise with components over a narrow range of frequencies
16: What is a calibrator?
A. A device which muffles sound.
B. A device which produces a known sound pressure on the microphone of a sound level measurement system.
C. A device which amplifies sound.
D. A device which creates sound.
17: What is the cochlea?
A. The capital of Belgium
B. A river in Africa
C. An island in Greece
D. A spirally coiled organ located within the inner ear which contains the receptor organs essential to hearing.
18: What are the frequencies that mark the ends of a band called?
A. Crossover frequencies
B. Limit frequencies
C. Break frequencies
D. Cutoff frequencies
19: What is the definition of 'cycle'?
A. The complete sequence of values of a periodic quantity that occurs during one period.
B. A combination of two or more things that create a reinforcing effect
C. The path of an object around a point, especially a planet or star
D. A series of events that happens again and again in the same order
20: What does CYCLES PER SECOND measure?
A. Wavelength
B. Speed
C. Frequency
D. Amplitude
21: What is the SI unit of frequency?
A. Hertz
B. Faradays
C. Seconds
D. Joules
22: What are the surfaces of constant phase in a cylindrical wave?
A. Intersecting planes
B. Perpendicular planes
C. Parallel planes
D. Coaxial cylinders
23: What is a cylindrical wave?
A. A wave in which the surfaces of constant phase are diverging spheres.
B. A wave in which the surfaces of constant phase are converging spheres.
C. A wave in which the surfaces of constant phase are parallel planes.
D. A wave in which the surfaces of constant phase are coaxial cylinders.
24: What is the meaning of "damping"?
A. The addition of sound-dissipative materials
B. The attenuation of sound in a structure
C. The dissipation of energy with time or distance
D. The amplification of sound in a structure
25: What is the term used for the attenuation of sound in a structure?
A. Damping
B. Scattering
C. Reflection
D. Diffraction
26: What does the abbreviation "dB" stand for?
A. Data Byte
B. Density Bonus
C. Decimal Byte
D. Decibel
27: What is diffraction?
A. A modification which soundwaves undergo in passing by the edges of solid bodies.
B. The study of how sound waves interact with their environment.
C. The process of making sound waves
D. A device used to measure sound waves
28: What is the space-average sound pressure level of a given source?
A. The sound pressure level produced by the source in a given direction measured at the same distance
B. The average of the sound pressure levels produced by the source in all directions
C. The sound pressure level produced by the source in a given direction
29: Apparent downward shift in frequency of a sound is called ________.
A. FREQUENCY SHIFT
B. DOPPLER SHIFT
C. DOPPER EFFECT
D. PITCH SHIFT
30: What does the acronym "ECHO" stand for?
A. Elephant Call Heard Overseas
B. Every Cat Has an Outer lining
C. Easy Cycling for Healthier Oceans
D. Electronic Countermeasures and Homing Operations
31: What does "Leq" stand for?
A. Lowest energy quotient
B. Equivalent A-weighted sound level
C. Loudness equivalent proposal
D. Level of energy noise
32: What is the "inverse-square law"?
A. The sound pressure level decreases 12 dB with each doubling of distance from the source
B. The sound pressure level decreases 6 dB with each doubling of distance from the source
C. The sound pressure level increases 6 dB with each doubling of distance from the source
D. The sound pressure level is halved with each doubling of distance from the source.
33: What is the main purpose of a Filter?
A. To separate components of a signal on the basis of their frequency
B. To allow components in one or more frequency bands to pass relatively unattenuated
C. To attenuate components in other frequency bands
34: What is the definition of a free sound field?
A. A sound field in which the effects of obstacles or boundaries on sound propagated in that field are not negligible.
B. A sound field in which the effects of obstacles or boundaries on sound propagated in that field are nonexistent.
C. A sound field in which the effects of obstacles or boundaries on sound propagated in that field are minimal.
D. A sound field in which the effects of obstacles or boundaries on sound propagated in that field are negligible.
35: What is a sound field in which the effects of obstacles or boundaries on sound propagated in that field are negligible called?
A. Open Sound Field
B. Free Sound Field
C. Reflection Sound Field
D. Echo Sound Field
36: What is the function of hair cells?
A. Interneurons in the cochlea which transform the mechanical energy of sound into nerve impulses.
B. Motor neurons in the cochlea which transform the mechanical energy of sound into nerve impulses.
C. Sensory cells in the cochlea which transform the mechanical energy of sound into nerve impulses.
D. Sensory cells in the cochlea which transform the electrical energy of sound into nerve impulses.
37: What is the second harmonic called?
A. A sinusoidal component whose frequency is triple the fundamental frequency.
B. A sinusoidal component whose frequency is half the fundamental frequency.
C. A sinusoidal component whose frequency is the same as the fundamental frequency.
D. A sinusoidal component whose frequency is double the fundamental frequency.
38: What is a harmonic?
A. A sinusoidal component whose frequency is double that of the fundamental frequency of the wave
B. A sinusoidal component whose frequency is double that of the fundamental frequency of the wave
C. A sinusoidal component whose frequency is a whole-number multiple of the fundamental frequency of the wave
D. A sinusoidal component whose frequency is not a whole-number multiple of the fundamental frequency of the wave
39: What is hearing?
A. The study of acoustics
B. The subjective human response to sound
C. The study of ears
D. A physical response to sound
40: Hearing level is measured in what?
A. Seconds
B. Decibels
C. Intensity
D. Time
41: What is hearing loss?
A. A sensor-neural loss originating in the cochlea
B. An impairment of auditory acuity
C. A decibel loss of hearing at specified frequencies
D. A loss of hearing due to noise
42: What is the term denoting an impairment of auditory acuity?
A. Cochlear hearing loss
B. Articulation disorder
C. Sensorineural hearing loss
D. Hearing loss
43: The HTL is the ____?
A. The least amount of decibels needed to hear a sound.
B. Amount by which an individual's threshold of audibility differs from a standard audiometric threshold.
C. The highest amount of decibels needed to hear a sound.
D. The average amount of decibels needed to hear a sound.
44: The HTL is the amount in decibels by which an individual's threshold of audibility differs from what?
A. A standard audiometric threshold.
B. The sound of a pin drop
C. Their loudest volume
D. The average person's threshold
45: What does the acronym "Hz" stand for?
A. Henry
B. Histoire
C. Hertz
D. High
46: What is the impact sound insulating capabilities of floor-ceiling assemblies?
A. Wiccopee International
B. IMPACT INSULATION CLASS (IC)
C. Institute of Noise Control Engineering
D. International Organization for Standardization
47: What does a single-figure rating in the IMPACT INSULATION CLASS measure?
A. The weight of the floor-ceiling assemblies
B. The impact sound insulating capabilities of floor-ceiling assemblies
C. The ability of the floor-ceiling assemblies to resist impact
D. The size of the floor-ceiling assemblies
48: What is the sound produced by the collision of two solid objects called?
A. Noise
B. Reverb
C. Echo
D. Impact sound
49: What is the significance of 20 hertz?
A. It is the lowest frequency that humans can hear.
B. Sounds of a frequency lower than 20 hertz are infrasonic.
C. The speed of sound in air is approximately 343 m/s.
D. INFRASONIC is an acronym for the National Fillers Refuse Society.
50: What is the name for sounds of a frequency lower than 20 hertz?
A. Infrasonic
B. Supersonic
C. Ultrasonic
D. Hypersonic
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