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CAOHC EXAM QUESTIONS AND CORRECT ANSWERS|ACCURATE ACTUAL EXAM WITH FREQUENTLY TESTED QUESTIONS AND STUDY GUIDE| GUARANTEED PASS|ALREADY GRADED A+|LATEST UPDATE 2024/2025.$24.49
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CAOHC EXAM QUESTIONS AND CORRECT ANSWERS|ACCURATE ACTUAL EXAM WITH FREQUENTLY TESTED QUESTIONS AND STUDY GUIDE| GUARANTEED PASS|ALREADY GRADED A+|LATEST UPDATE 2024/2025.
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Course
CAOHC
Institution
CAOHC
CAOHC EXAM QUESTIONS AND CORRECT ANSWERS|ACCURATE
ACTUAL EXAM WITH FREQUENTLY TESTED QUESTIONS AND STUDY
GUIDE| GUARANTEED PASS|ALREADY GRADED A+|LATEST UPDATE
2024/2025.
CAOHC EXAM QUESTIONS AND CORRECT ANSWERS|ACCURATE
ACTUAL EXAM WITH FREQUENTLY TESTED QUESTIONS AND STUDY
GUIDE| GUARANTEED PASS|ALREADY GRADED A+|LATEST 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
,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
Ototoxins cause _________________ hearing loss - CORRECT ANSWER Sensorineural
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
2. Impulse/impact noise
When is steady state noise considered hazardous? - CORRECT ANSWER 85dBA or greater
, Harmful steady state noise must last ________________ - CORRECT ANSWER Longer than
one second
In what measurement are steady state noise levels in hearing conservation almost always
expressed? - CORRECT ANSWER dBA
When are impulse/impact noise considered hazardous? - CORRECT ANSWER 140 dBP
Harmful impulse/impact noise must last _______________ - CORRECT ANSWER Less than
one second
At what frequencies is the human ear most sensitive? - CORRECT ANSWER 500 - 4,000 Hz
________________ is used to filter and measured sound to capture sounds considered to be
hazardous to hearing. - CORRECT ANSWER A-weighting
________________ correlates well with risk of noise induced hearing loss - CORRECT
ANSWER A-weighting
What weighting scale is used for regulatory compliance in hearing conservation? - CORRECT
ANSWER dBA
What weighting scale is used for impact/impulse? - CORRECT ANSWER Linear - dBP or dB
SPL
What are the two components of noise exposure? - CORRECT ANSWER 1. Level (dBA)
2. Duration (time)
What reflects the relationship between allowable exposure times and specific noise levels? -
CORRECT ANSWER Exchange rate
What is the exchange rate for OSHA and MSHA? - CORRECT ANSWER 5dB
What is the exchange rate for NIOSH, HCGIH, European Union, DOD, EPA, and best practice?
- CORRECT ANSWER 3dB
What is the constant A-weighted sound level that can have potentially the same damage over an
8-hour period as the actual work day noise exposure? - CORRECT ANSWER TWA
What regulatory body regulates most of the US manufacturing industry? - CORRECT
ANSWER OSHA
What agencies regulate occupational exposure? - CORRECT ANSWER 1. OSHA
2. MSHA
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