Noise Control MCQ
What is TINNITUS?
Answer
Correct Answer:
Ringing in the ear or noise sensed in the head
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TINNITUS may indicate a lesion of which system?
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What is an attribute of auditory sensation that allows a subject to judge that two sounds similarly presented are dissimilar?
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What is the customarily expressed unit for the amount of threshold shift?
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How is the amount of threshold shift customarily expressed?
Answer
Correct Answer:
In decibels
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The minimum sound pressure level of a sound outside the ear that will produce a transition from discomfort to definite pain is known as?
Answer
Correct Answer:
Threshold of Pain
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The minimum sound pressure level at which a person can hear a specified frequency of sound is known as?
Answer
Correct Answer:
Threshold of Audibility
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What is the ratio of the cutoff frequencies of a third-octave band?
Answer
Correct Answer:
2 to the one-third power
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What is TTS?
Answer
Correct Answer:
A temporary impairment of hearing acuity as indicated by a change in the threshold of audibility.
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What is an oscillation in pressure called?
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What is the main cause of SOCIOCUSIS?
Answer
Correct Answer:
Loss of hearing caused by noise exposures that are part of the social environment
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What is the unit of measurement for loudness?
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What is the loudness of a sound whose loudness level is 40 phons?
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What is the definition of "shielding"?
Answer
Correct Answer:
The attenuation of a sound, achieved by placing barriers between a sound source and the receiver
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What does SABIN measure?
Answer
Correct Answer:
The sound absorption of a surface
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What is a resonator?
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Correct Answer:
A device that resounds or vibrates in sympathy with a source of sound or vibration.
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What is a device that resounds or vibrates in sympathy with a source of sound or vibration called?
Answer
Correct Answer:
Resonator
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What is the "natural frequency of vibration" of an object?
Answer
Correct Answer:
The frequency at which the object vibrates most energetically
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What is REFRACTION?
Answer
Correct Answer:
The bending of a sound wave from its original path
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What is the return of a sound wave from a surface called?
Answer
Correct Answer:
Reflection
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What is the mathematical term for a noise whose instantaneous magnitude is not specified for any given instant of time?
Answer
Correct Answer:
Random noise
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RANDOM NOISE can be described statistically by what?
Answer
Correct Answer:
Probability distribution functions
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What is random noise?
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Correct Answer:
An oscillation whose instantaneous magnitude is not specified for any given instant of time.
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What attribute of auditory sensation orders sounds on a scale from low to high?
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What is the primary factor that determines pitch?
Answer
Correct Answer:
Frequency
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What does PINK NOISE mean?
Answer
Correct Answer:
Noise with constant energy per octave band width
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What is the unit of measurement for loudness level?
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What does PHON stand for?
Answer
Correct Answer:
The unit of measurement for loudness level
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PTS stands for __________.
Answer
Correct Answer:
Permanent Threshold Shift
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What does PERIOD mean?
Answer
Correct Answer:
The duration of time it takes for a periodic wave form to repeat itself.
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What does PERIOD refer to?
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Correct Answer:
The duration of time it takes for a periodic wave form to repeat itself
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What is the peak sound pressure?
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Correct Answer:
The maximum absolute value of the instantaneous sound pressure in a specific time interval
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What is the maximum absolute value of the instantaneous sound pressure in a specific time interval called?
Answer
Correct Answer:
Peak sound pressure
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What does OSHA stand for?
Answer
Correct Answer:
Occupational Safety and Health Administration
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What is OSCILLATION?
Answer
Correct Answer:
The variation with time, alternately increasing and decreasing, of a feature of a sound or a solid object.
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What is the integrated sound pressure level of only those sine-wave components in a specified octave band called?
Answer
Correct Answer:
OCTAVE BAND LEVEL
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What is an octave band level?
Answer
Correct Answer:
The integrated sound pressure level of only those sine-wave components in a specified octave band.
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What is an octave band?
Answer
Correct Answer:
A segment of the frequency spectrum separated by an octave.
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What does an octave band separate?
Answer
Correct Answer:
A segment of the frequency spectrum
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What is the interval between two sounds having a frequency ratio of two called?
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There are _____ octaves on the keyboard of a standard piano.
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What is the NR?
Answer
Correct Answer:
The numerical difference, in decibels, of the average sound pressure levels in two areas or rooms.
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What is the numerical difference, in decibels, of the average sound pressure levels in two areas or rooms called?
Answer
Correct Answer:
Noise Reduction
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What does A-weighted sound level refer to?
Answer
Correct Answer:
Airborne sound
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What is the full form of "NIC"?
Answer
Correct Answer:
Noise Isolation Class
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What is the definition of noise?
Answer
Correct Answer:
Unwanted sound
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What does NIOSH stand for?
Answer
Correct Answer:
National Institute for Occupational Safety and Health
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What is the sound field very near to a source called?
Answer
Correct Answer:
Near Field
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What is a medium?
Answer
Correct Answer:
A substance carrying a sound wave.
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What does the term "masking noise" refer to?
Answer
Correct Answer:
A noise that is intense enough to render inaudible or unintelligible another sound that is also present.
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What is the process by which the threshold of audibility for a sound is raised by the presence of another (masking) sound?
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LOUDNESS LEVEL is measured in what?
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LOUDNESS LEVEL is numerically equal to the median sound pressure level of what?
Answer
Correct Answer:
A free progressive 1000 Hz wave
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Over much of the frequency range, how much increase in sound pressure is required to produce a doubling of loudness?
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What is the definition of a logarithm?
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Correct Answer:
The exponent that indicates the power to which a number must be raised to produce a given number.
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What is the number that indicates the power to which a number must be raised to produce a given number called?
Answer
Correct Answer:
Logarithm
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What is a level?
Answer
Correct Answer:
The logarithm of the ratio of a quantity to a reference quantity of the same kind.
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What is the logarithm of the ratio of a quantity to a reference quantity of the same kind called?
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What does ISO stand for?
Answer
Correct Answer:
International Organization for Standardization
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What is the correct term for the acoustic wave behavior described in the INVERSE SQUARE LAW?
Answer
Correct Answer:
The mean-square pressure varies inversely with the square of the distance from the source.
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What is intensity?
Answer
Correct Answer:
The sound energy flow through a unit area in a unit time.
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What is the name for sounds of a frequency lower than 20 hertz?
Answer
Correct Answer:
Infrasonic
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What is the significance of 20 hertz?
Answer
Correct Answer:
It is the lowest frequency that humans can hear.
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What is the sound produced by the collision of two solid objects called?
Answer
Correct Answer:
Impact sound
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What does a single-figure rating in the IMPACT INSULATION CLASS measure?
Answer
Correct Answer:
The impact sound insulating capabilities of floor-ceiling assemblies
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What is the impact sound insulating capabilities of floor-ceiling assemblies?
Answer
Correct Answer:
IMPACT INSULATION CLASS (IC)
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What does the acronym "Hz" stand for?
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The HTL is the amount in decibels by which an individual's threshold of audibility differs from what?
Answer
Correct Answer:
A standard audiometric threshold.
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The HTL is the ____?
Answer
Correct Answer:
Amount by which an individual's threshold of audibility differs from a standard audiometric threshold.
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What is the term denoting an impairment of auditory acuity?
Answer
Correct Answer:
Hearing loss
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What is hearing loss?
Answer
Correct Answer:
An impairment of auditory acuity
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Hearing level is measured in what?
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What is hearing?
Answer
Correct Answer:
The subjective human response to sound
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What is a harmonic?
Answer
Correct Answer:
A sinusoidal component whose frequency is a whole-number multiple of the fundamental frequency of the wave
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What is the second harmonic called?
Answer
Correct Answer:
A sinusoidal component whose frequency is double the fundamental frequency.
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What is the function of hair cells?
Answer
Correct Answer:
Sensory cells in the cochlea which transform the mechanical energy of sound into nerve impulses.
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What is a sound field in which the effects of obstacles or boundaries on sound propagated in that field are negligible called?
Answer
Correct Answer:
Free Sound Field
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What is the definition of a free sound field?
Answer
Correct Answer:
A sound field in which the effects of obstacles or boundaries on sound propagated in that field are negligible.
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What is the main purpose of a Filter?
Answer
Correct Answer:
To separate components of a signal on the basis of their frequency
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What is the "inverse-square law"?
Answer
Correct Answer:
The sound pressure level decreases 6 dB with each doubling of distance from the source
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What does "Leq" stand for?
Answer
Correct Answer:
Equivalent A-weighted sound level
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What does the acronym "ECHO" stand for?
Answer
Correct Answer:
Electronic Countermeasures and Homing Operations
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Apparent downward shift in frequency of a sound is called ________.
Answer
Correct Answer:
DOPPLER SHIFT
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What is the space-average sound pressure level of a given source?
Answer
Correct Answer:
The average of the sound pressure levels produced by the source in all directions
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What is diffraction?
Answer
Correct Answer:
A modification which soundwaves undergo in passing by the edges of solid bodies.
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What does the abbreviation "dB" stand for?
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What is the term used for the attenuation of sound in a structure?
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What is the meaning of "damping"?
Answer
Correct Answer:
The dissipation of energy with time or distance
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What is a cylindrical wave?
Answer
Correct Answer:
A wave in which the surfaces of constant phase are coaxial cylinders.
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What are the surfaces of constant phase in a cylindrical wave?
Answer
Correct Answer:
Coaxial cylinders
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What is the SI unit of frequency?
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What does CYCLES PER SECOND measure?
Answer
Correct Answer:
Frequency
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What is the definition of 'cycle'?
Answer
Correct Answer:
The complete sequence of values of a periodic quantity that occurs during one period.
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What are the frequencies that mark the ends of a band called?
Answer
Correct Answer:
Cutoff frequencies
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What is the cochlea?
Answer
Correct Answer:
A spirally coiled organ located within the inner ear which contains the receptor organs essential to hearing.
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What is a calibrator?
Answer
Correct Answer:
A device which produces a known sound pressure on the microphone of a sound level measurement system.
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What is BROADBAND NOISE?
Answer
Correct Answer:
Noise with components over a wide range of frequencies
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What is the lower cutoff frequency of a band pass filter?
Answer
Correct Answer:
Greater than zero
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What does BAND stand for?
Answer
Correct Answer:
Any segment of the frequency spectrum.
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What is the meaning of the term "background noise"?
Answer
Correct Answer:
The total of all noise in a system or situation, independent of the presence of the desired signal.
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What is the total of all noise in a system or situation, independent of the presence of the desired signal called?
Answer
Correct Answer:
Background noise
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What is the range of the AI?
Answer
Correct Answer:
Between 0 and 1.0
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What is the range of the articulation index?
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What does the acronym "ANSI" stand for?
Answer
Correct Answer:
The American National Standards Institute
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What does ANSI stand for?
Answer
Correct Answer:
American National Standards Institute
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What is the main purpose of an anechoic room?
Answer
Correct Answer:
To create free field conditions
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What is the total of all noise in the environment called?
Answer
Correct Answer:
Ambient Noise
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What is AIRBORNE SOUND?
Answer
Correct Answer:
Sound that reaches the point of interest by propagation through air.
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What does the term "acoustic trauma" usually imply?
Answer
Correct Answer:
A single traumatic event
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What is the science of sound called?
Answer
Correct Answer:
Acoustics
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What does absorption do to sound energy?
Answer
Correct Answer:
Reduces the amount of sound energy reflected
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