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CAOHC EXAM QUESTIONS AND ANSWERS
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CAOHC EXAM QUESTIONS AND ANSWERS
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CAOHC EXAM QUESTIONS AND ANSWERSUnit of measurement for frequency (pitch) - Answers- Hertz (Hz)
Unit of measurement for intensity (loudness) - Answers- Decibel (dB)
Risk of damage from noise - Answers- How loud (intensity) and how long (duration)
Steady-state or continuous noise, e.g. generator - Answers- Lasts 1 second or longer
Impulse or Impact noise, e.g. gunfire or nail gun - Answers- Lasts less than one second
Parts of the outer ear - Answers- Pinna and external auditory canal
Parts of the middle ear - Answers- Tympanic membrane, ossicles, eustachian tube
Eustachian tube (auditory tube) - Answers- Tube connecting the middle ear to the
pharynx and equalizes middle ear space with atmospheric pressure
Conductive HL occurs here - Answers- Outer or middle ear
Sensorineural hearing loss - Answers- Hearing loss resulting from damage to the inner
ear (cochlea) or the auditory nerve
Noise-induced hearing loss (NIHL) - Answers- 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 - Answers- Combination of conductive and sensorineural types in
the same ear
Middle ear bones (ossicles) - Answers- Malleus (hammer), incus (anvil), stapes (stirrup)
Possible early symptoms/signs of noise induced hearing loss - Answers- Tinnitus;
difficulty understanding in presence of background noise; read visual cues
Auditory effects of noise - Answers- NIHL; tinnitus; hyperacusis
Non-auditory effects of noise - Answers- annoyance
sleep disturbance
attention
motivation
stress reactions
cardiovascular problems
endocrine problems
, 3 foot rule - Answers- 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) - Answers- OSHA enforces regulation and
NIOSH recommends best practice based on science and research
Sound pressure level (SPL) versus hearing level (HL) - Answers- 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
Sound Level Meter A-weighted Scale - Answers- OSHA requires this scale as it
resembles how the human ear responds to sound (humans hear best from 500 Hz to
4000 Hz
Human Frequency Response at Birth - Answers- 20 Hz to 20,000 Hz (20 kHz)
Human speech frequency range - Answers- 250 Hz to 4000 Hz
Elements of a Hearing Conservation Program - Answers- Noise hazard assessment;
engineering/administrative controls; annual hearing monitoring; annual
training/education; hearing protection; recordkeeping
OSHA Noise Amendment - Answers- 29 CFR 1910.95
Hughson-Westlake Procedure - Answers- Common procedure for obtaining threshold;
the audiologist decreases stimulus intensity by 10 dB with a (+) response and increases
by 5 dB with a (-) response
Hearing threshold level - Answers- Lowest intensity level responded to at least 50% of
the time
Excessive noise levels will impact these test frequencies during a hearing exam -
Answers- Low frequencies e.g. 500 Hz
First frequency always tested on an occupational hearing exam - Answers- 1000 Hz
1000 Hz retest - Answers- Done as a validity check on first ear tested; thresholds
should be within 5dB or should reinstruct patient and start test over
Presbycusis - Answers- A gradual loss of sensorineural hearing that occurs as the body
ages
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