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CAOHC STUDY QUESTIONS AND ANSWERS
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CAOHC STUDY QUESTIONS AND ANSWERS
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CAOHC STUDY QUESTIONS AND ANSWERSManufacturing - Answers- Which occupational sector accounts for the highest incidence
of noise-induced hearing loss?
Tinnitus - Answers- A buzzing or ringing in the ears is known as
Three - Answers- Noise exposures are considered likely to be harmful if shouting is
required in order to communicate to a person __________ feet away
Painless, Progressive, Permanent, Preventable - Answers- What are the four P's of
Noise-Induced Hearing Loss
140 dBP - Answers- Impulse noise becomes hazardous at
Frequency - Answers- Hertz (Hz) is used to measure
Pitch - Answers- The frequency of sound is perceived as
Decibels (dB) - Answers- The amplitude/intensity of a sound is measured in
Exchange rate - Answers- What reflects the relationship between the allowable
exposure time and the noise intensity level?
90/85 - Answers- OSHA prescribes a permissible exposure limit (PEL) of __________
dBA TWA and the DoD prescribes a PEL of __________
A - Answers- Workplace hazard surveys are completed using the __________
weighting scale
85/85 - Answers- OSHA prescribes an action level of __________ dBA TWA and DoD
prescribes an action level of __________
engineering - Answers- Adding a muffler to noisy equipment to reduce noise exposure
is an example of what kind of control?
250-4000 Hz - Answers- Human speech is located in this range of hearing
malleus, incus, stapes - Answers- What are the three bones of the middle ear?
8 - Answers- Time Weighted Average is based on an __________ hour exposure
use and use correctly - Answers- The best hearing protection is the one that you
__________
Presbycusis - Answers- Aging related hearing loss is known as
, NIOSH - Answers- The organization responsible for conducting research and making
recommendations for best/recommended practices
preventable - Answers- NIHL is
Daily - Answers- Biological calibration checks must be performed how often?
Sensorineural - Answers- A noise notch found in audiogram results is indicative of what
type of hearing loss?
Conductive - Answers- Impacted cerumen can cause this type of hearing loss
Inner ear - Answers- Sensorineural hearing loss affects what part of the ear?
5 - Answers- OHCs must be recertified every __________ years
3/5 - Answers- The DoD uses a __________ dB time-intensity exchange rate where
OSHA prescribes a __________ dB time-intensity exchange rate
500 - Answers- Excessive background noise in the test area generally affects the
threshold at __________ Hertz (Hz) the most
50% - Answers- The hearing threshold level is defined as the point where the subject
hears the tone __________ of the time
2217 - Answers- The daily calibration check is documented on the DD
Inner ear - Answers- The area of the ear most affected by noise damage
Noise Reduction Rating (NRR) - Answers- What term does hearing protector packaging
use to indicate noise attenuation?
Cochlear hair cell damage - Answers- Hearing loss from noise exposure is usually due
to
middle ear - Answers- Which part of the ear mechanically amplifies sound?
4000 Hz - Answers- Someone with a classic noise-induced hearing loss will likely have
their worst hearing thresholds at
sloped/notched - Answers- The audiometric configuration most consistent with noise
induced hearing loss is
two - Answers- A threshold is determined when the test subject hears the tone at the
same volume level __________ out of three times ascending
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