Hearing Aid Dispenser Written Exam
UPDATED ACTUAL Questions and
CORRECT Answers
db loss of a perforation of TM - CORRECT ANSWER- 10-15db loss
procedure done to fix perforation - CORRECT ANSWER- tympanoplasty or myringoplasty
monomeric spots - CORRECT ANSWER- looks like a hole in TM, but reflects light like a
mirror. holes that have healed. aka "mirror membranes"
average dimentions of an adult eardrum - CORRECT ANSWER- 2.3-2.9cm in length, .7cm
in diameters
pars tensa - CORRECT ANSWER- lower 4/5 of TM and tight
pars flaccida - CORRECT ANSWER- upper 1/5 of TM and flaccid
otis externa - CORRECT ANSWER- "swimmers ear" - inflammation of the walls of the
EAM. will not cause loss unless swelling blocks canal. treat: warm salt water, drying it, topical
antibiotics
polyps - CORRECT ANSWER- masses of tissue that grow outward from a surface
cholesteatoma - CORRECT ANSWER- non-cancerous tumor in the middle ear. oderous
discharge. sometimes perforates upper TM. invasions of skin into the middle ear - sac of
concentric rings of protein. causes conductive loss. most dangerous pathology.
,enlarged canal - CORRECT ANSWER- result of ear surgery. often have no ear drum or
ossicular chain. need approval of physician before fitting
tympanosclerosis - CORRECT ANSWER- white, chalky calcium deposits caused by
degeneration of tissue on eardrum, thicking and scarring from peforations and infections
epitympanic cavity - CORRECT ANSWER- attic of middle ear. allows air into mastoid cells
of temporal bone. branches several nerves
incudotapedial junction - CORRECT ANSWER- top of incus to head of stapes
annular ligament - CORRECT ANSWER- footplate of stapes that is held in the oval window
speed of sound - CORRECT ANSWER- 700mph or 340 m/s (4x as fast through water, 14x
as fast through steel)
reflection - CORRECT ANSWER- is an echo or a reverberation
reverberation - CORRECT ANSWER- often in a small room, 17m or less, reverbs can mask
high frequencies
echo - CORRECT ANSWER- heard and perceived later than original sound (more than
1/10s after)
absorption - CORRECT ANSWER- aborbs sound. can improve environments w/ reflection
or reverb. better in warmth and moist
diffraction - CORRECT ANSWER- sharpness in the change in direction of sound, bending.
high diffraction=bigger wavelengths (low freq)
, refraction - CORRECT ANSWER- sound passes through one medium to another, change in
speed and wavelength
infrasound - CORRECT ANSWER- below audible range of 20 Hz
ultrasound - CORRECT ANSWER- above audible range of 20K Hz
octave - CORRECT ANSWER- anytime the frequency doubles. f(2) = on octave; f(3)= two
octaves
faintest sound a human can hear - CORRECT ANSWER- 10 ^ -16 watts/cm^2 and pressure
of .0002 dynes/cm^2
threshold of pain - CORRECT ANSWER- 1000 dynes/cm^2
when SPL levels double how many db levels increase? - CORRECT ANSWER- 6 db
db HL expresses: - CORRECT ANSWER- threshold levels
db SPL expresses: - CORRECT ANSWER- voices or environmental sounds
pinna function: - CORRECT ANSWER- gather sound, aid in localization, enahnce high freq
bw 2k-5k hz
aperture - CORRECT ANSWER- entrance to canal, first bend
isthmus - CORRECT ANSWER- narrowing of canal
UPDATED ACTUAL Questions and
CORRECT Answers
db loss of a perforation of TM - CORRECT ANSWER- 10-15db loss
procedure done to fix perforation - CORRECT ANSWER- tympanoplasty or myringoplasty
monomeric spots - CORRECT ANSWER- looks like a hole in TM, but reflects light like a
mirror. holes that have healed. aka "mirror membranes"
average dimentions of an adult eardrum - CORRECT ANSWER- 2.3-2.9cm in length, .7cm
in diameters
pars tensa - CORRECT ANSWER- lower 4/5 of TM and tight
pars flaccida - CORRECT ANSWER- upper 1/5 of TM and flaccid
otis externa - CORRECT ANSWER- "swimmers ear" - inflammation of the walls of the
EAM. will not cause loss unless swelling blocks canal. treat: warm salt water, drying it, topical
antibiotics
polyps - CORRECT ANSWER- masses of tissue that grow outward from a surface
cholesteatoma - CORRECT ANSWER- non-cancerous tumor in the middle ear. oderous
discharge. sometimes perforates upper TM. invasions of skin into the middle ear - sac of
concentric rings of protein. causes conductive loss. most dangerous pathology.
,enlarged canal - CORRECT ANSWER- result of ear surgery. often have no ear drum or
ossicular chain. need approval of physician before fitting
tympanosclerosis - CORRECT ANSWER- white, chalky calcium deposits caused by
degeneration of tissue on eardrum, thicking and scarring from peforations and infections
epitympanic cavity - CORRECT ANSWER- attic of middle ear. allows air into mastoid cells
of temporal bone. branches several nerves
incudotapedial junction - CORRECT ANSWER- top of incus to head of stapes
annular ligament - CORRECT ANSWER- footplate of stapes that is held in the oval window
speed of sound - CORRECT ANSWER- 700mph or 340 m/s (4x as fast through water, 14x
as fast through steel)
reflection - CORRECT ANSWER- is an echo or a reverberation
reverberation - CORRECT ANSWER- often in a small room, 17m or less, reverbs can mask
high frequencies
echo - CORRECT ANSWER- heard and perceived later than original sound (more than
1/10s after)
absorption - CORRECT ANSWER- aborbs sound. can improve environments w/ reflection
or reverb. better in warmth and moist
diffraction - CORRECT ANSWER- sharpness in the change in direction of sound, bending.
high diffraction=bigger wavelengths (low freq)
, refraction - CORRECT ANSWER- sound passes through one medium to another, change in
speed and wavelength
infrasound - CORRECT ANSWER- below audible range of 20 Hz
ultrasound - CORRECT ANSWER- above audible range of 20K Hz
octave - CORRECT ANSWER- anytime the frequency doubles. f(2) = on octave; f(3)= two
octaves
faintest sound a human can hear - CORRECT ANSWER- 10 ^ -16 watts/cm^2 and pressure
of .0002 dynes/cm^2
threshold of pain - CORRECT ANSWER- 1000 dynes/cm^2
when SPL levels double how many db levels increase? - CORRECT ANSWER- 6 db
db HL expresses: - CORRECT ANSWER- threshold levels
db SPL expresses: - CORRECT ANSWER- voices or environmental sounds
pinna function: - CORRECT ANSWER- gather sound, aid in localization, enahnce high freq
bw 2k-5k hz
aperture - CORRECT ANSWER- entrance to canal, first bend
isthmus - CORRECT ANSWER- narrowing of canal
