Noise Control MCQ

What is TINNITUS?

Answer

Correct Answer: Ringing in the ear or noise sensed in the head

Note: This Question is unanswered, help us to find answer for this one

TINNITUS may indicate a lesion of which system?

Answer

Correct Answer: Auditory

Note: This Question is unanswered, help us to find answer for this one

What is an attribute of auditory sensation that allows a subject to judge that two sounds similarly presented are dissimilar?

Answer

Correct Answer: Timbre

Note: This Question is unanswered, help us to find answer for this one

What is the customarily expressed unit for the amount of threshold shift?

Answer

Correct Answer: Decibels

Note: This Question is unanswered, help us to find answer for this one

How is the amount of threshold shift customarily expressed?

Answer

Correct Answer: In decibels

Note: This Question is unanswered, help us to find answer for this one

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

Note: This Question is unanswered, help us to find answer for this one

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

Note: This Question is unanswered, help us to find answer for this one

What is the ratio of the cutoff frequencies of a third-octave band?

Answer

Correct Answer: 2 to the one-third power

Note: This Question is unanswered, help us to find answer for this one

What is TTS?

Answer

Correct Answer: A temporary impairment of hearing acuity as indicated by a change in the threshold of audibility.

Note: This Question is unanswered, help us to find answer for this one

What is an oscillation in pressure called?

Answer

Correct Answer: Sound

Note: This Question is unanswered, help us to find answer for this one

What is the main cause of SOCIOCUSIS?

Answer

Correct Answer: Loss of hearing caused by noise exposures that are part of the social environment

Note: This Question is unanswered, help us to find answer for this one

What is the unit of measurement for loudness?

Answer

Correct Answer: SONE

Note: This Question is unanswered, help us to find answer for this one

What is the loudness of a sound whose loudness level is 40 phons?

Answer

Correct Answer: One sone

Note: This Question is unanswered, help us to find answer for this one

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

Note: This Question is unanswered, help us to find answer for this one

What does SABIN measure?

Answer

Correct Answer: The sound absorption of a surface

Note: This Question is unanswered, help us to find answer for this one

What is a resonator?

Answer

Correct Answer: A device that resounds or vibrates in sympathy with a source of sound or vibration.

Note: This Question is unanswered, help us to find answer for this one

What is a device that resounds or vibrates in sympathy with a source of sound or vibration called?

Answer

Correct Answer: Resonator

Note: This Question is unanswered, help us to find answer for this one

What is the "natural frequency of vibration" of an object?

Answer

Correct Answer: The frequency at which the object vibrates most energetically

Note: This Question is unanswered, help us to find answer for this one

What is REFRACTION?

Answer

Correct Answer: The bending of a sound wave from its original path

Note: This Question is unanswered, help us to find answer for this one

What is the return of a sound wave from a surface called?

Answer

Correct Answer: Reflection

Note: This Question is unanswered, help us to find answer for this one

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

Note: This Question is unanswered, help us to find answer for this one

RANDOM NOISE can be described statistically by what?

Answer

Correct Answer: Probability distribution functions

Note: This Question is unanswered, help us to find answer for this one

What is random noise?

Answer

Correct Answer: An oscillation whose instantaneous magnitude is not specified for any given instant of time.

Note: This Question is unanswered, help us to find answer for this one

What attribute of auditory sensation orders sounds on a scale from low to high?

Answer

Correct Answer: Pitch

Note: This Question is unanswered, help us to find answer for this one

What is the primary factor that determines pitch?

Answer

Correct Answer: Frequency

Note: This Question is unanswered, help us to find answer for this one

What does PINK NOISE mean?

Answer

Correct Answer: Noise with constant energy per octave band width

Note: This Question is unanswered, help us to find answer for this one

What is the unit of measurement for loudness level?

Answer

Correct Answer: PHON

Note: This Question is unanswered, help us to find answer for this one

What does PHON stand for?

Answer

Correct Answer: The unit of measurement for loudness level

Note: This Question is unanswered, help us to find answer for this one

PTS stands for __________.

Answer

Correct Answer: Permanent Threshold Shift

Note: This Question is unanswered, help us to find answer for this one

What does PERIOD mean?

Answer

Correct Answer: The duration of time it takes for a periodic wave form to repeat itself.

Note: This Question is unanswered, help us to find answer for this one

What does PERIOD refer to?

Answer

Correct Answer: The duration of time it takes for a periodic wave form to repeat itself

Note: This Question is unanswered, help us to find answer for this one

What is the peak sound pressure?

Answer

Correct Answer: The maximum absolute value of the instantaneous sound pressure in a specific time interval

Note: This Question is unanswered, help us to find answer for this one

What is the maximum absolute value of the instantaneous sound pressure in a specific time interval called?

Answer

Correct Answer: Peak sound pressure

Note: This Question is unanswered, help us to find answer for this one

What does OSHA stand for?

Answer

Correct Answer: Occupational Safety and Health Administration

Note: This Question is unanswered, help us to find answer for this one

What is OSCILLATION?

Answer

Correct Answer: The variation with time, alternately increasing and decreasing, of a feature of a sound or a solid object.

Note: This Question is unanswered, help us to find answer for this one

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

Note: This Question is unanswered, help us to find answer for this one

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.

Note: This Question is unanswered, help us to find answer for this one

What is an octave band?

Answer

Correct Answer: A segment of the frequency spectrum separated by an octave.

Note: This Question is unanswered, help us to find answer for this one

What does an octave band separate?

Answer

Correct Answer: A segment of the frequency spectrum

Note: This Question is unanswered, help us to find answer for this one

What is the interval between two sounds having a frequency ratio of two called?

Answer

Correct Answer: Octave

Note: This Question is unanswered, help us to find answer for this one

There are _____ octaves on the keyboard of a standard piano.

Answer

Correct Answer: 8

Note: This Question is unanswered, help us to find answer for this one

What is the NR?

Answer

Correct Answer: The numerical difference, in decibels, of the average sound pressure levels in two areas or rooms.

Note: This Question is unanswered, help us to find answer for this one

What is the numerical difference, in decibels, of the average sound pressure levels in two areas or rooms called?

Answer

Correct Answer: Noise Reduction

Note: This Question is unanswered, help us to find answer for this one

What does A-weighted sound level refer to?

Answer

Correct Answer: Airborne sound

Note: This Question is unanswered, help us to find answer for this one

What is the full form of "NIC"?

Answer

Correct Answer: Noise Isolation Class

Note: This Question is unanswered, help us to find answer for this one

What is the definition of noise?

Answer

Correct Answer: Unwanted sound

Note: This Question is unanswered, help us to find answer for this one

What does NIOSH stand for?

Answer

Correct Answer: National Institute for Occupational Safety and Health

Note: This Question is unanswered, help us to find answer for this one

What is the sound field very near to a source called?

Answer

Correct Answer: Near Field

Note: This Question is unanswered, help us to find answer for this one

What is a medium?

Answer

Correct Answer: A substance carrying a sound wave.

Note: This Question is unanswered, help us to find answer for this one

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.

Note: This Question is unanswered, help us to find answer for this one

What is the process by which the threshold of audibility for a sound is raised by the presence of another (masking) sound?

Answer

Correct Answer: MASKING

Note: This Question is unanswered, help us to find answer for this one

LOUDNESS LEVEL is measured in what?

Answer

Correct Answer: Phons

Note: This Question is unanswered, help us to find answer for this one

LOUDNESS LEVEL is numerically equal to the median sound pressure level of what?

Answer

Correct Answer: A free progressive 1000 Hz wave

Note: This Question is unanswered, help us to find answer for this one

Over much of the frequency range, how much increase in sound pressure is required to produce a doubling of loudness?

Answer

Correct Answer: 10 dB

Note: This Question is unanswered, help us to find answer for this one

What is the definition of a logarithm?

Answer

Correct Answer: The exponent that indicates the power to which a number must be raised to produce a given number.

Note: This Question is unanswered, help us to find answer for this one

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

Note: This Question is unanswered, help us to find answer for this one

What is a level?

Answer

Correct Answer: The logarithm of the ratio of a quantity to a reference quantity of the same kind.

Note: This Question is unanswered, help us to find answer for this one

What is the logarithm of the ratio of a quantity to a reference quantity of the same kind called?

Answer

Correct Answer: Level

Note: This Question is unanswered, help us to find answer for this one

What does ISO stand for?

Answer

Correct Answer: International Organization for Standardization

Note: This Question is unanswered, help us to find answer for this one

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.

Note: This Question is unanswered, help us to find answer for this one

What is intensity?

Answer

Correct Answer: The sound energy flow through a unit area in a unit time.

Note: This Question is unanswered, help us to find answer for this one

What is the name for sounds of a frequency lower than 20 hertz?

Answer

Correct Answer: Infrasonic

Note: This Question is unanswered, help us to find answer for this one

What is the significance of 20 hertz?

Answer

Correct Answer: It is the lowest frequency that humans can hear.

Note: This Question is unanswered, help us to find answer for this one

What is the sound produced by the collision of two solid objects called?

Answer

Correct Answer: Impact sound

Note: This Question is unanswered, help us to find answer for this one

What does a single-figure rating in the IMPACT INSULATION CLASS measure?

Answer

Correct Answer: The impact sound insulating capabilities of floor-ceiling assemblies

Note: This Question is unanswered, help us to find answer for this one

What is the impact sound insulating capabilities of floor-ceiling assemblies?

Answer

Correct Answer: IMPACT INSULATION CLASS (IC)

Note: This Question is unanswered, help us to find answer for this one

What does the acronym "Hz" stand for?

Answer

Correct Answer: Hertz

Note: This Question is unanswered, help us to find answer for this one

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.

Note: This Question is unanswered, help us to find answer for this one

The HTL is the ____?

Answer

Correct Answer: Amount by which an individual's threshold of audibility differs from a standard audiometric threshold.

Note: This Question is unanswered, help us to find answer for this one

What is the term denoting an impairment of auditory acuity?

Answer

Correct Answer: Hearing loss

Note: This Question is unanswered, help us to find answer for this one

What is hearing loss?

Answer

Correct Answer: An impairment of auditory acuity

Note: This Question is unanswered, help us to find answer for this one

Hearing level is measured in what?

Answer

Correct Answer: Decibels

Note: This Question is unanswered, help us to find answer for this one

What is hearing?

Answer

Correct Answer: The subjective human response to sound

Note: This Question is unanswered, help us to find answer for this one

What is a harmonic?

Answer

Correct Answer: A sinusoidal component whose frequency is a whole-number multiple of the fundamental frequency of the wave

Note: This Question is unanswered, help us to find answer for this one

What is the second harmonic called?

Answer

Correct Answer: A sinusoidal component whose frequency is double the fundamental frequency.

Note: This Question is unanswered, help us to find answer for this one

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.

Note: This Question is unanswered, help us to find answer for this one

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

Note: This Question is unanswered, help us to find answer for this one

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.

Note: This Question is unanswered, help us to find answer for this one

What is the main purpose of a Filter?

Answer

Correct Answer: To separate components of a signal on the basis of their frequency

Note: This Question is unanswered, help us to find answer for this one

What is the "inverse-square law"?

Answer

Correct Answer: The sound pressure level decreases 6 dB with each doubling of distance from the source

Note: This Question is unanswered, help us to find answer for this one

What does "Leq" stand for?

Answer

Correct Answer: Equivalent A-weighted sound level

Note: This Question is unanswered, help us to find answer for this one

What does the acronym "ECHO" stand for?

Answer

Correct Answer: Electronic Countermeasures and Homing Operations

Note: This Question is unanswered, help us to find answer for this one

Apparent downward shift in frequency of a sound is called ________.

Answer

Correct Answer: DOPPLER SHIFT

Note: This Question is unanswered, help us to find answer for this one

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

Note: This Question is unanswered, help us to find answer for this one

What is diffraction?

Answer

Correct Answer: A modification which soundwaves undergo in passing by the edges of solid bodies.

Note: This Question is unanswered, help us to find answer for this one

What does the abbreviation "dB" stand for?

Answer

Correct Answer: Decibel

Note: This Question is unanswered, help us to find answer for this one

What is the term used for the attenuation of sound in a structure?

Answer

Correct Answer: Damping

Note: This Question is unanswered, help us to find answer for this one

What is the meaning of "damping"?

Answer

Correct Answer: The dissipation of energy with time or distance

Note: This Question is unanswered, help us to find answer for this one

What is a cylindrical wave?

Answer

Correct Answer: A wave in which the surfaces of constant phase are coaxial cylinders.

Note: This Question is unanswered, help us to find answer for this one

What are the surfaces of constant phase in a cylindrical wave?

Answer

Correct Answer: Coaxial cylinders

Note: This Question is unanswered, help us to find answer for this one

What is the SI unit of frequency?

Answer

Correct Answer: Hertz

Note: This Question is unanswered, help us to find answer for this one

What does CYCLES PER SECOND measure?

Answer

Correct Answer: Frequency

Note: This Question is unanswered, help us to find answer for this one

What is the definition of 'cycle'?

Answer

Correct Answer: The complete sequence of values of a periodic quantity that occurs during one period.

Note: This Question is unanswered, help us to find answer for this one

What are the frequencies that mark the ends of a band called?

Answer

Correct Answer: Cutoff frequencies

Note: This Question is unanswered, help us to find answer for this one

What is the cochlea?

Answer

Correct Answer: A spirally coiled organ located within the inner ear which contains the receptor organs essential to hearing.

Note: This Question is unanswered, help us to find answer for this one

What is a calibrator?

Answer

Correct Answer: A device which produces a known sound pressure on the microphone of a sound level measurement system.

Note: This Question is unanswered, help us to find answer for this one

What is BROADBAND NOISE?

Answer

Correct Answer: Noise with components over a wide range of frequencies

Note: This Question is unanswered, help us to find answer for this one

What is the lower cutoff frequency of a band pass filter?

Answer

Correct Answer: Greater than zero

Note: This Question is unanswered, help us to find answer for this one

What does BAND stand for?

Answer

Correct Answer: Any segment of the frequency spectrum.

Note: This Question is unanswered, help us to find answer for this one

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.

Note: This Question is unanswered, help us to find answer for this one

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

Note: This Question is unanswered, help us to find answer for this one

What is the range of the AI?

Answer

Correct Answer: Between 0 and 1.0

Note: This Question is unanswered, help us to find answer for this one

What is the range of the articulation index?

Answer

Correct Answer: 0 to 1.0

Note: This Question is unanswered, help us to find answer for this one

What does the acronym "ANSI" stand for?

Answer

Correct Answer: The American National Standards Institute

Note: This Question is unanswered, help us to find answer for this one

What does ANSI stand for?

Answer

Correct Answer: American National Standards Institute

Note: This Question is unanswered, help us to find answer for this one

What is the main purpose of an anechoic room?

Answer

Correct Answer: To create free field conditions

Note: This Question is unanswered, help us to find answer for this one

What is the total of all noise in the environment called?

Answer

Correct Answer: Ambient Noise

Note: This Question is unanswered, help us to find answer for this one

What is AIRBORNE SOUND?

Answer

Correct Answer: Sound that reaches the point of interest by propagation through air.

Note: This Question is unanswered, help us to find answer for this one

What does the term "acoustic trauma" usually imply?

Answer

Correct Answer: A single traumatic event

Note: This Question is unanswered, help us to find answer for this one

What is the science of sound called?

Answer

Correct Answer: Acoustics

Note: This Question is unanswered, help us to find answer for this one

What does absorption do to sound energy?

Answer

Correct Answer: Reduces the amount of sound energy reflected

Note: This Question is unanswered, help us to find answer for this one