CAOHC TEST QUESTIONS AND CORRECT VERIFIED ANSWERS 2025

CAOHC TEST QUESTIONS AND CORRECT VERIFIED ANSWERS 2025 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 are non auditory effects on hearing and damage risks? - Correct Answer Stress, high blood pressure" "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 potential sources of hazardous noise in non occupational work settings? - Correct Answer Motorcycles, sporting guns, carpentry equipment, lawn equipment, personal listening devices" "Peripheral functions are those associated with the? - Correct Answer Cochlea" "Conductive disorders are typical to which site of lesion, in contrast to NIHL? - Correct Answer Outer and middle ear" "Serial audiogram configurations typically shows: - Correct Answer Numerical" "What is the audible frequency range at birth? - Correct Answer 20-20,000 Hz" "low/high requency Hz is subjectively interpreted as what? - Correct Answer Low and high pitch" "Frequency is subjectively interpreted as? - Correct Answer Pitch and the number of cycles per second" "What is the speech range for most communication? - Correct Answer 250- 4,000 Hz" "Low/high intesity (dB) is subjectively interpreted as? - Correct Answer Low/ High loudness (intensity corresponds to loudness)" "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 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 are examples of auditory effects on hearing and damage risks? - Correct Answer Tinnitus and hearing loss" "What are the don'ts of an OHC (hearing tech)? - Correct Answer Diagnose, supervise" "Who can be Professional Supervisors? - Correct Answer Audiologists and physicians" "How many workers are exposed to hazardous noise on the job? - Correct Answer 22 million plus" "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." "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" "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" "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" "An early stage indication of noise induced hearing loss is identified typically at which frequencies on an audiogram? - Correct Answer 3-6 kHz" "What is a general rule of conductive hearing loss? - Correct Answer Flat and often worse at low frequencies" "What would be an indication of an advanced stage noise induced hearing loss? - Correct Answer A notch configuration progressing to a high-frequency slope" "Mixed hearing loss is a combination of what? - Correct Answer Conductive and sensorineural components" "What is a symptom of sensorineural hearing loss? - Correct Answer Difficulty discriminating speech or tinnitus" "What is a symptom of conductive hearing loss? - Correct Answer Fullness, pressure, muffled hearing and clarify when sound is loud enough" "The Action level is at what dB? (requires HCO implementation i.e. hearing testin, program inclusion, hpd) - Correct Answer 85 dB" "Permissible exposure level is at what dB? - Correct Answer 90 DB" "What is the concept of steady state noise? - Correct Answer Long duration (>.5) i.e engine noise" "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)" "What is an example of an impact noise? - Correct Answer Hammer to nail" "What is an example of an impulse noise? - Correct Answer Gunshot" "dB (A) is used for? - Correct Answer OSHA, MSHA, FRA, DoD compliance in hearing conservation." "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 should one wear double hpd? - Correct Answer 104-108dB" "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" "What are the OSHA regulations for exchange rates associated with TWAs? - Correct Answer 5 dB" "What are the NIOSH recommendations for exchange rates associated with with TWAs? - Correct Answer 3 dB" "Confirmation of an STS must take place within? - Correct Answer 21 days" "0 dB HL does not mean what? - Correct Answer It does not mean that there is no sound at that level" "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" "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" "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 are indications for manual audiometry? - Correct Answer Slow/inappropriate responses, no response, unilateral hearing loss, and functional hearing loss." "What is the pace at which pure tones should be presented? - Correct Answer between 1-2 seconds" "State and local requirements must what? - Correct Answer Meet or exceed federally mandated HC requirements. (be equal or more strict)" "Background noise can affect what? - Correct Answer Low frequencies 500 Hz and below." "What is an indication for a special testing situation? - Correct Answer Claustrophobia" "Acoustic calibrations must be done? - Correct Answer Yearly" "Functionaly and biological checks are part of what? - Correct Answer Daily calibration" "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 the quiet peroid baseline before testing? - Correct Answer 14 hrs" "When trouble shooting an audiometric booth, or isolating noise sources who or whom should one turn to? - Correct Answer Acoustical engineer"