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Unit of measurement for frequency (pitch) - ANSWER-Hertz (Hz)
Unit of measurement for intensity (loudness) - ANSWER-Decibel (dB)
Risk of damage from noise - ANSWER-How loud (intensity) and how long
(duration)
Steady-state or continuous noise, e.g. generator - ANSWER-Lasts 1 second or
longer
Impulse or Impact noise, e.g. gunfire or nail gun - ANSWER-Lasts less than one
second
Parts of the outer ear - ANSWER-Pinna and external auditory canal
Parts of the middle ear - ANSWER-Tympanic membrane, ossicles, eustachian
tube
Eustachian tube (auditory tube) - ANSWER-Tube connecting the middle ear to the
pharynx and equalizes middle ear space with atmospheric pressure
Conductive HL occurs here - ANSWER-Outer or middle ear
, Sensorineural hearing loss - ANSWER-Hearing loss resulting from damage to the
inner ear (cochlea) or the auditory nerve
Noise-induced hearing loss (NIHL) - ANSWER-Condition caused by the
destruction of hair cells, the organs responsible for hearing, as a result of sounds
that are "too long, too loud, or too close"; a sensorineural hearing loss
Mixed hearing loss - ANSWER-Combination of conductive and sensorineural types
in the same ear
Middle ear bones (ossicles) - ANSWER-Malleus (hammer), incus (anvil), stapes
(stirrup)
Possible early symptoms/signs of noise induced hearing loss - ANSWER-Tinnitus;
difficulty understanding in presence of background noise; read visual cues
Auditory effects of noise - ANSWER-NIHL; tinnitus; hyperacusis
Non-auditory effects of noise - ANSWER-annoyance
sleep disturbance
attention
motivation
stress reactions
cardiovascular problems
endocrine problems
3 foot rule - ANSWER-Good rule of thumb to recognize hazardous noise exposure
levels/situations: the rule is: if you have to shout at arms length (~3ft), in order to
be understood over the background noise, then you're likely exposed to hazardous
noise levels & should be wearing hearing protection to prevent NIHL
OSHA (Occupational Safety and Health Administration) versus National institute of
Occupational Safety and Heath (NIOSH) - ANSWER-OSHA enforces regulation
and NIOSH recommends best practice based on science and research
Sound pressure level (SPL) versus hearing level (HL) - ANSWER-SPL describes
noise measurements taken with a sound level meter or dosimeter; HL describes
Threshold levels obtained with an audiometer; 0 dB HL is not equal to 0 dB SPL
Noise Dosimeter - ANSWER-A sound measurement device used to record the
amount of sound exposure over an extended period of
time (usually a work day)
Personal vs. Area
Answers Latest Update | CAOHC
EXAM QUESTIONS WITH CORRECT
ANSWERS LATEST UPDATED |
CAOHC Exam Study Guide –
Questions With 100% Correct
Answers & CAOHC Final Exam Prep
Questions with 100% correct Answers
Latest Updated
Unit of measurement for frequency (pitch) - ANSWER-Hertz (Hz)
Unit of measurement for intensity (loudness) - ANSWER-Decibel (dB)
Risk of damage from noise - ANSWER-How loud (intensity) and how long
(duration)
Steady-state or continuous noise, e.g. generator - ANSWER-Lasts 1 second or
longer
Impulse or Impact noise, e.g. gunfire or nail gun - ANSWER-Lasts less than one
second
Parts of the outer ear - ANSWER-Pinna and external auditory canal
Parts of the middle ear - ANSWER-Tympanic membrane, ossicles, eustachian
tube
Eustachian tube (auditory tube) - ANSWER-Tube connecting the middle ear to the
pharynx and equalizes middle ear space with atmospheric pressure
Conductive HL occurs here - ANSWER-Outer or middle ear
, Sensorineural hearing loss - ANSWER-Hearing loss resulting from damage to the
inner ear (cochlea) or the auditory nerve
Noise-induced hearing loss (NIHL) - ANSWER-Condition caused by the
destruction of hair cells, the organs responsible for hearing, as a result of sounds
that are "too long, too loud, or too close"; a sensorineural hearing loss
Mixed hearing loss - ANSWER-Combination of conductive and sensorineural types
in the same ear
Middle ear bones (ossicles) - ANSWER-Malleus (hammer), incus (anvil), stapes
(stirrup)
Possible early symptoms/signs of noise induced hearing loss - ANSWER-Tinnitus;
difficulty understanding in presence of background noise; read visual cues
Auditory effects of noise - ANSWER-NIHL; tinnitus; hyperacusis
Non-auditory effects of noise - ANSWER-annoyance
sleep disturbance
attention
motivation
stress reactions
cardiovascular problems
endocrine problems
3 foot rule - ANSWER-Good rule of thumb to recognize hazardous noise exposure
levels/situations: the rule is: if you have to shout at arms length (~3ft), in order to
be understood over the background noise, then you're likely exposed to hazardous
noise levels & should be wearing hearing protection to prevent NIHL
OSHA (Occupational Safety and Health Administration) versus National institute of
Occupational Safety and Heath (NIOSH) - ANSWER-OSHA enforces regulation
and NIOSH recommends best practice based on science and research
Sound pressure level (SPL) versus hearing level (HL) - ANSWER-SPL describes
noise measurements taken with a sound level meter or dosimeter; HL describes
Threshold levels obtained with an audiometer; 0 dB HL is not equal to 0 dB SPL
Noise Dosimeter - ANSWER-A sound measurement device used to record the
amount of sound exposure over an extended period of
time (usually a work day)
Personal vs. Area
