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Caohc Exam Questions And Correct AnswersLatest Update
2024/2025
What does CAOHC stand for? - CORRECT ANSWER Council for
Accreditation in What is the most common occupational illness and second
most self reported occupational
illness for American workers? - CORRECT ANSWER Noise induced hearing loss
(NIHL)
What occupation has the highest percentage of noise induced hearing loss? -
CORRECT ANSWER Manufacturing
Approximately how many people are exposed to hazardous noise in the
workplace? - CORRECT ANSWER 30 million people
What occupation has the highest prevalence of exposure to noise? - CORRECT
ANSWER Mining
What are the two parts of the outer ear? - CORRECT ANSWER 1. Auricle (pinna)
2. External auditory meatus (Ear canal)
What are the names of the three bones in the middle ear? - CORRECT ANSWER
1. Malleus (hammer)
2. Incus (anvil)
3. Stapes (stirrup)
What are the smallest bones in the human body? - CORRECT ANSWER Ossicles
What are the two primary structures in the inner ear? - CORRECT ANSWER 1.
Cochlea (hearing)
2. Vestibular System (balance)
What is the vestibular system attached to? - CORRECT ANSWER
The ear What are the three types of hearing loss? - CORRECT
ANSWER 1. Conductive
2. Sensorineural
3. Mixed
Where does conductive hearing loss occur? - CORRECT ANSWER The outer or
middle ear
,Caohc Exam Questions And Correct AnswersLatest Update
2024/2025
Is conductive hearing loss treatable? - CORRECT ANSWER Yes
Where does sensorineural hearing loss occur? - CORRECT ANSWER
The inner ear Is sensorineural hearing loss treatable? - CORRECT
ANSWER No
What is mixed hearing loss? - CORRECT ANSWER A combination of
conductive and sensorineural hearing loss
What is an example of an outer ear problem? - CORRECT ANSWER 1.
Cerumen impaction (excessive earwax)
2. Otitis Externa (outer ear
infection) (Conductive hearing
loss)
What is an example of a middle ear problem? - CORRECT ANSWER 1. Otitis
Media (middle ear infection)
2. Perforated tympanic
membrane (Conductive
hearing loss)
What are some examples of inner ear problems? - CORRECT ANSWER 1. Noise
induced hearing loss (NIHL)
2. Prebycusis (Age related hearing loss)
3. Ototoxicity (Chemical induced)
4. Disease
5. Sudden idiopathic sensorineural hearing loss (wake up and just
can't hear) (Permanent hearing loss)
Electrical signals from hair cells are transmitted to . - CORRECT
ANSWER Auditory nerves
,Caohc Exam Questions And Correct AnswersLatest Update
2024/2025
, Caohc Exam Questions And Correct AnswersLatest Update
2024/2025
3. Asphyxiants (carbon monoxide)
4. Medication (chemotherapeutics)
What is the working definition of sound? - CORRECT ANSWER Any pressure
change in air, water, or other medium, which the human ear can detect
What is necessary for sound? - CORRECT ANSWER 1. Source of Energy
2. Vibrating body
3. Medium
4. Receiver
What are the properties of sound? - CORRECT ANSWER 1. Frequency (pitch)
2. Intensity (loudness)
3. Duration (time)
Define frequency - CORRECT ANSWER The number of cycles per second
What is the unit of measurement for frequency? - CORRECT ANSWER Hertz (Hz)
What is the range of frequency for human hearing? - CORRECT ANSWER 20 -
20,000 Hz What is the range of frequency for human speech? - CORRECT
ANSWER 250 - 4,000 Hz
What is the BEST range of frequency for human hearing? - CORRECT
ANSWER 500 - 4,000Hz
Define intensity - CORRECT ANSWER Amplitude of sound wave
If pressure is increased then amplitude is ? - CORRECT ANSWER
Increased What is the range of human hearing amplitude (level) - CORRECT
ANSWER 0 - 140 dB SPL
What does SPL stand for and what is it measured in? - CORRECT ANSWER
Sound pressure levels
Measured in decibels (db)
100 dB + 100 dB = ?? - CORRECT ANSWER 103 dB
What are the two types of duration? - CORRECT ANSWER 1. Steady state noise
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