CAOHC CORE EXAM SET 2026/2027 QUESTIONS AND
SOLUTIONS RATED A+
✔✔Sensorineural - ✔✔A noise notch found in audiogram results is indicative of what
type of hearing loss?
✔✔Conductive - ✔✔Impacted cerumen can cause this type of hearing loss
✔✔Inner ear - ✔✔Sensorineural hearing loss affects what part of the ear?
✔✔5 - ✔✔OHCs must be recertified every __________ years
✔✔3/5 - ✔✔The DoD uses a __________ dB time-intensity exchange rate where OSHA
prescribes a __________ dB time-intensity exchange rate
✔✔500 - ✔✔Excessive background noise in the test area generally affects the threshold
at __________ Hertz (Hz) the most
✔✔50% - ✔✔The hearing threshold level is defined as the point where the subject
hears the tone __________ of the time
✔✔2217 - ✔✔The daily calibration check is documented on the DD
✔✔Inner ear - ✔✔The area of the ear most affected by noise damage
✔✔Noise Reduction Rating (NRR) - ✔✔What term does hearing protector packaging
use to indicate noise attenuation?
✔✔Cochlear hair cell damage - ✔✔Hearing loss from noise exposure is usually due to
✔✔middle ear - ✔✔Which part of the ear mechanically amplifies sound?
✔✔4000 Hz - ✔✔Someone with a classic noise-induced hearing loss will likely have
their worst hearing thresholds at
✔✔sloped/notched - ✔✔The audiometric configuration most consistent with noise
induced hearing loss is
✔✔two - ✔✔A threshold is determined when the test subject hears the tone at the same
volume level __________ out of three times ascending
✔✔85 dBA TWA - ✔✔Single hearing protection is required when the steady state noise
level exceeds
, ✔✔140 dBP - ✔✔Single hearing protection is required when the impulse noise exceeds
✔✔ototoxic exposure - ✔✔Causes of hearing loss include disease, injury, age,
genetics, and
✔✔loneliness, fatigue, high blood pressure, increased stress hormone levels, raised
heart rate, disruption of healthy sleep patterns - ✔✔What are three non-auditory effects
of hearing loss?
✔✔tinnitus, hyperacusis, difficulty understanding speech - ✔✔Auditory effects of
hearing loss include
✔✔1-2 - ✔✔All audiometer tones should be presented for ____________ seconds
✔✔500Hz, 1000Hz, 2000Hz, 3000 Hz, 4000Hz, 6000Hz - ✔✔The test frequencies
required by ANSI S3.21 are
✔✔DD 2215 - ✔✔Which form is used to document the baseline audiogram?
✔✔annually - ✔✔Electroacoustic calibrations are required
✔✔name - ✔✔Noise-exposed personnel must be identified by __________
✔✔21 - ✔✔A worker with an OSHA-recordable hearing loss must be notifed in writing
within __________ days
✔✔Significant threshold shift (standard threshold shift for OSHA) - ✔✔A change in
hearing threshold (+ or -), relative to the baseline audiogram, of an average of 10 dB or
more, at 2000, 3000, and 4000 Hz, in one or both ears is called?
✔✔25 - ✔✔For an STS to be considered recordable, it must be work-related and result
in average hearing thresholds greater than or equal to __________ dB average at 2000,
3000, and 4000 Hz in the effected ear
✔✔diagnose - ✔✔A Certified Occupation Hearing Conservationist (COHC) cannot
__________ patients
✔✔Occlusion effect - ✔✔The effect that makes the user's voice sound deeper
✔✔resistance - ✔✔When checking your HPD for the proper fit, you should feel
_____________ when you tug or try to remove the HPD
SOLUTIONS RATED A+
✔✔Sensorineural - ✔✔A noise notch found in audiogram results is indicative of what
type of hearing loss?
✔✔Conductive - ✔✔Impacted cerumen can cause this type of hearing loss
✔✔Inner ear - ✔✔Sensorineural hearing loss affects what part of the ear?
✔✔5 - ✔✔OHCs must be recertified every __________ years
✔✔3/5 - ✔✔The DoD uses a __________ dB time-intensity exchange rate where OSHA
prescribes a __________ dB time-intensity exchange rate
✔✔500 - ✔✔Excessive background noise in the test area generally affects the threshold
at __________ Hertz (Hz) the most
✔✔50% - ✔✔The hearing threshold level is defined as the point where the subject
hears the tone __________ of the time
✔✔2217 - ✔✔The daily calibration check is documented on the DD
✔✔Inner ear - ✔✔The area of the ear most affected by noise damage
✔✔Noise Reduction Rating (NRR) - ✔✔What term does hearing protector packaging
use to indicate noise attenuation?
✔✔Cochlear hair cell damage - ✔✔Hearing loss from noise exposure is usually due to
✔✔middle ear - ✔✔Which part of the ear mechanically amplifies sound?
✔✔4000 Hz - ✔✔Someone with a classic noise-induced hearing loss will likely have
their worst hearing thresholds at
✔✔sloped/notched - ✔✔The audiometric configuration most consistent with noise
induced hearing loss is
✔✔two - ✔✔A threshold is determined when the test subject hears the tone at the same
volume level __________ out of three times ascending
✔✔85 dBA TWA - ✔✔Single hearing protection is required when the steady state noise
level exceeds
, ✔✔140 dBP - ✔✔Single hearing protection is required when the impulse noise exceeds
✔✔ototoxic exposure - ✔✔Causes of hearing loss include disease, injury, age,
genetics, and
✔✔loneliness, fatigue, high blood pressure, increased stress hormone levels, raised
heart rate, disruption of healthy sleep patterns - ✔✔What are three non-auditory effects
of hearing loss?
✔✔tinnitus, hyperacusis, difficulty understanding speech - ✔✔Auditory effects of
hearing loss include
✔✔1-2 - ✔✔All audiometer tones should be presented for ____________ seconds
✔✔500Hz, 1000Hz, 2000Hz, 3000 Hz, 4000Hz, 6000Hz - ✔✔The test frequencies
required by ANSI S3.21 are
✔✔DD 2215 - ✔✔Which form is used to document the baseline audiogram?
✔✔annually - ✔✔Electroacoustic calibrations are required
✔✔name - ✔✔Noise-exposed personnel must be identified by __________
✔✔21 - ✔✔A worker with an OSHA-recordable hearing loss must be notifed in writing
within __________ days
✔✔Significant threshold shift (standard threshold shift for OSHA) - ✔✔A change in
hearing threshold (+ or -), relative to the baseline audiogram, of an average of 10 dB or
more, at 2000, 3000, and 4000 Hz, in one or both ears is called?
✔✔25 - ✔✔For an STS to be considered recordable, it must be work-related and result
in average hearing thresholds greater than or equal to __________ dB average at 2000,
3000, and 4000 Hz in the effected ear
✔✔diagnose - ✔✔A Certified Occupation Hearing Conservationist (COHC) cannot
__________ patients
✔✔Occlusion effect - ✔✔The effect that makes the user's voice sound deeper
✔✔resistance - ✔✔When checking your HPD for the proper fit, you should feel
_____________ when you tug or try to remove the HPD
