CAOHC Exam Study CAOHC test Latest Update 2024-2025 700 Questions and 100% Verified Correct Answers Guaranteed A+ At First Attempt
0 dB HL does not mean what? - CORRECT ANSWER: It does not mean that there is no
sound at that level
0-25dB HL represents what? - CORRECT ANSWER: Normal hearing range
90 dB HL represents what? - CORRECT ANSWER: Typically the highest output level
on a pure tone air conduction screening audiometer
A laboratory value assigned to the individual porduct and not a reflection of what kind of
attenuation the worker will ultimately recieve is called? - CORRECT ANSWER: NRR
Acoustic calibrations must be done? - CORRECT ANSWER: Yearly
Acoustic transformer, impedance matching system, provides pressue equalization, and protects the inner ear is the function of what part of the ear? - CORRECT ANSWER: Middle ear
An early stage indication of noise induced hearing loss is identified typically at which
frequencies on an audiogram? - CORRECT ANSWER: 3-6 kHz
Background noise can affect what? - CORRECT ANSWER: Low frequencies 500 Hz
and below.
Collects sound waves, localizes sounds waves, protects middle ear components and provides resonate amplication is the function of what part of the ear? - CORRECT
ANSWER: Outer ear
Conductive disorders are typical to which site of lesion, in contrast to NIHL? -
CORRECT ANSWER: Outer and middle ear
Confirmation of an STS must take place within? - CORRECT ANSWER: 21 days
dB (A) is used for? - CORRECT ANSWER: OSHA, MSHA, FRA, DoD compliance in
hearing conservation.
Frequency is subjectively interpreted as? - CORRECT ANSWER: Pitch and the number of cycles per second
Functionaly and biological checks are part of what? - CORRECT ANSWER: Daily
calibration 1 / 4
How many workers are exposed to hazardous noise on the job? - CORRECT
ANSWER: 22 million plus
Low/high intesity (dB) is subjectively interpreted as? - CORRECT ANSWER: Low/ High loudness (intensity corresponds to loudness)
low/high requency Hz is subjectively interpreted as what? - CORRECT ANSWER: Low
and high pitch
Mixed hearing loss is a combination of what? - CORRECT ANSWER: Conductive and
sensorineural components
Peripheral functions are those associated with the? - CORRECT ANSWER: Cochlea
Permissible exposure level is at what dB? - CORRECT ANSWER: 90 DB
Provides intensity, frequency and temporal coding that is relayed via the auditory nerve for further processing is the function of what part of the ear? - CORRECT ANSWER: Inner ear
Serial audiogram configurations typically shows: - CORRECT ANSWER: Numerical
State and local requirements must what? - CORRECT ANSWER: Meet or exceed
federally mandated HC requirements. (be equal or more strict)
The Action level is at what dB? (requires HCO implementation i.e. hearing testin,
program inclusion, hpd) - CORRECT ANSWER: 85 dB
The highest amount of noise suuposedly an employee may be exposed to without
incurring the risk of adverse health effects is known as the? - CORRECT ANSWER:
Time weighted average (TWA)
What are examples of auditory effects on hearing and damage risks? - CORRECT
ANSWER: Tinnitus and hearing loss
What are indications for manual audiometry? - CORRECT ANSWER:
Slow/inappropriate responses, no response, unilateral hearing loss, and functional hearing loss.
What are non auditory effects on hearing and damage risks? - CORRECT ANSWER:
Stress, high blood pressure
What are potential sources of hazardous noise in non occupational work settings? -
CORRECT ANSWER: Motorcycles, sporting guns, carpentry equipment, lawn
equipment, personal listening devices 2 / 4
What are potential sources of hazardous noise in occupational work settings? -
CORRECT ANSWER: Machinery, constructino, railoroads and equipment, mining,
manufacturing, farming, professional musician
What are some of the lasting effects of noise induced hearing loss? - CORRECT
ANSWER: Social withdrawal, frustration, anger, and effects on private life
What are the "do's" of an OHC (hearing tech)? - CORRECT ANSWER: Education, fitting hearing protection, hearing test, and counciling
What are the don'ts of an OHC (hearing tech)? - CORRECT ANSWER: Diagnose,
supervise
What are the NIOSH recommendations for exchange rates associated with with TWAs?
- CORRECT ANSWER: 3 dB
What are the OSHA regulations for exchange rates associated with TWAs? -
CORRECT ANSWER: 5 dB
What HL (hearing level) scale is constructed to represent the average softest sound a
young adult can hear at each test frequency. - CORRECT ANSWER: 0 dB HL
What is a general rule of conductive hearing loss? - CORRECT ANSWER: Flat and
often worse at low frequencies
What is a symptom of conductive hearing loss? - CORRECT ANSWER: Fullness,
pressure, muffled hearing and clarify when sound is loud enough
What is a symptom of sensorineural hearing loss? - CORRECT ANSWER: Difficulty
discriminating speech or tinnitus
What is an advantage of using a microprocessor versus a manual audiometer? -
CORRECT ANSWER: The ability to test multiple people at one time
What is an example of an impact noise? - CORRECT ANSWER: Hammer to nail
What is an example of an impulse noise? - CORRECT ANSWER: Gunshot
What is an indication for a special testing situation? - CORRECT ANSWER:
Claustrophobia
What is the audible frequency range at birth? - CORRECT ANSWER: 20-20,000 Hz
What is the concept of intermittent noise? - CORRECT ANSWER: Noise that comes
and goes and is sometimes cyclical (i.e vehichle warning backup noise or hydraulic lift) 3 / 4
What is the concept of steady state noise? - CORRECT ANSWER: Long duration (>.5) i.e engine noise
What is the difference between the requiremtns of OSHA and the recommendations of
NIOSH? - CORRECT ANSWER: NIOSH refers to research and recoomendations.
OSHA regulates and implements.
What is the pace at which pure tones should be presented? - CORRECT ANSWER:
between 1-2 seconds
What is the purpose of the OHC? - CORRECT ANSWER: Providing resources and
guidance to facilitate the practice of hearing loss prevention through standardized training and credentialing
What is the quiet peroid baseline before testing? - CORRECT ANSWER: 14 hrs
What is the speech range for most communication? - CORRECT ANSWER: 250- 4,000
Hz
What occupational population is most at risk for noise induced hearing loss which
highest amount of claims? - CORRECT ANSWER: Manufacturing accounts for
approximately 14% of U.S workforce but accounts for approximately 80% of incidence of NIHL.
What serves as the basis for all other U.S hearing conservation regulations and thus is
the basis for the OHC course instruction. - CORRECT ANSWER: OSHA Amendment
(29 CFR 1910.95)
What should one wear double hpd? - CORRECT ANSWER: 104-108dB
What would be an indication of an advanced stage noise induced hearing loss? -
CORRECT ANSWER: A notch configuration progressing to a high-frequency slope
When trouble shooting an audiometric booth, or isolating noise sources who or whom
should one turn to? - CORRECT ANSWER: Acoustical engineer
Who can be Professional Supervisors? - CORRECT ANSWER: Audiologists and
physicians
#Days to notify individual of an STS in writing - CORRECT ANSWER: 21 days
3 foot rule - CORRECT ANSWER: Good rule of thumb to recognize hazardous noise
exposure levels/situations: the rule is: if you have to shout at arms length (~3ft), in order to be understood over the background noise, then you're likely exposed to hazardous noise levels & should be wearing hearing protection to prevent NIHL
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