CAOHC EXAM 2 2026 OCCUPATIONAL
HEARING CONSERVATION TEST PAPER
QUESTIONS AND SOLUTIONS GRADED A+
◉ 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 in the inner ear, 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
HEARING CONSERVATION TEST PAPER
QUESTIONS AND SOLUTIONS GRADED A+
◉ 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 in the inner ear, 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
