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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 ANSWERSWhat does CAOHC stand for - Answers- Council for Accreditation in Occupational
Hearing Conservation
CAOHC Mission - Answers- To advance best practice in occupational hearing
conservation worldwide, through credentialing, education and advocacy
Air conduction testing - Answers- Assesses outer ear, middle ear, and inner function
Parts of the ear - Answers- outer, middle, inner
Outer ear - Answers- pinna and auditory canal
Middle ear - Answers- the chamber between the eardrum and cochlea containing three
tiny bones (hammer, anvil, and stirrup) that concentrate the vibrations of the eardrum on
the cochlea's oval window
inner ear - Answers- the innermost part of the ear, containing the cochlea, semicircular
canals, and vestibular sacs
purpose of the outer ear - Answers- collect sound waves
Purpose of middle ear - Answers- amplify sound
purpose of inner ear - Answers- process/interpret
bone conduction testing - Answers- Testing the inner ear
Pressure Equalization tube - Answers- small tube placed in the tympanic membrane to
"vent" the middle ear and prevent negative pressure build up. Is NOT for drainage of
fluid.
What is the frequency range at birth for the cochlea? - Answers- 20-20,000 Hz
Where is the primary site of damage from noise exposure in the ear? - Answers-
Cochlea
What is the frequency that causes noise exposure in the cochlea? - Answers- 3,4,6 Hz
What frequency is noise induce hearing loss start at? - Answers- 3000- 6000
Hearing loss due to age, medical, illness starts at what frequency? - Answers- High
Non-auditory effects of hearing loss - Answers- Depression, isolation, frustration, anger,
tinnitus, and stress
, Hyperacusis - Answers- excessively sensitive hearing
Phonophobia - Answers- abnormal sensitivity to noise commonly associated with
migraines
Misophonia - Answers- sensitivity to specific sounds
What is the rate of hearing loss growth is greatest in first ________ years - Answers-
10 years of exposure
HLPP - Answers- Hearing Loss Prevention Program
Components of HLPP - Answers- Noise measurement, abatement, hearing protection,
audiometric testing, hearing conservation training, recordkeeping
Requirements for sound - Answers- source, path, and receiver
Components of sound - Answers- frequency and amplitude/intensity
frequency - Answers- the number of complete wavelengths that pass a point in a given
time
Frequency is measured in - Answers- Hertz (Hz)
Amplitude - Answers- Height of a wave
What is the frequency of the human ear at birth? - Answers- 20 hz- 20,000 hz
What is the frequency of speech for the human ear? - Answers- 250 hz-4000 hz
Frequently pitch arm _____ - Answers- hertz
What is the threshold of softest level the ear can hear 50% of the time - Answers- 0 hz
Types of sound/noise - Answers- continuous, variable, impulsive
Continuous/steady state - Answers- < 115 dBA
Example of variable/intermittent sounds - Answers- constructions, forklift, music
impulsive/impact - Answers- < 140 dB SPL
Examples of impulsive sounds - Answers- fireworks, gun shot
dBA - Answers- Most likely how human ear responds to sound
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