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CAOHC exam Questions and Correct
Answers
Unprotected exposure to hazardous noise causes: Ans: —
Temporary and/or permanent hearing loss
Temporary and/or permanent tinnitus (ringing, buzzing in ears)
Occupational noise sources Ans: — Agriculture, mining, railroads
• Manufacturing - largest hazardous noise-exposed population
• Machinery, weapons, vehicles, tools, equipment
Noise-Induced Illness: Ans: — hearing loss and tinnitus
Occurs gradually, over time, from repeated exposures
Noise-Induced Injury: Ans: — hearing loss and tinnitus
Occurs from one significant exposure or event
Recreational noise sources Ans: — Lawn care, power tools,
equipment, firearms, music, motorcycles
AUDITORY EFFECTS OF NOISE EXPOSURE Ans: — Loss of hearing
sensitivity
• Tinnitus
• Missing parts of conversation
• Slower, inaccurate localization
• Increased errors, safety mishaps
Non-auditory effects of noise exposure Ans: — Raise blood
pressure
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• Raise heart rate
• Increase stress hormone levels
• Disrupt healthy sleep patterns
• Result in possible reassignment to a different job
• Result in embarrassment, frustration, and social withdrawal
4 P'S OF NOISE-INDUCED HEARING LOSS (NIHL) Ans: — 1)Painless
2) Progressive
3) Permanent
4) Preventable
Purpose of hearing conservation program Ans: — • Prevent
occupation-related NIHL
• Job retention
• Reduce costs of hearing loss: > $240 million per year
• Promote healthy hearing and quality of life
HCP major elements Ans: — - noise hazard assesment
- noise controls
- audiometric monitoring
-hearing protection devices
-hearing conversation education
-recordkeeping
-program evaluation
CAOHC MISSION Ans: — Advancing best practices in occupational
hearing conservation worldwide, through credentialing, standards,
education, and advocacy.
CAOHC VISION Ans: — A world without occupational hearing loss
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engineering controls Ans: — primary means to reduce or control
noise, dampen, enclose, or isolate noise
- use HOD obly after engeneering controls prove unfeasible
administrative controls Ans: — policies and procedures
implemented to reduce noise exposure
-standard operating proceedures (shift rotation, time in noise
limitations)
VA COHC scope of practice Ans: — In accordance with VHA
DIRECTIVE 1170.02
Checks and calibration of audiometric instrumentation
• Otoscopic screening and pure-tone air conduction threshold
testing, for the purpose of a hearing conservation program •
Otoscopy and pure-tone air conduction threshold testing without
interpretation for established patients
• Proper fitting and training of various personal hearing
protection devices
• Basic counseling of employees concerning hearing conservation
test results and employee referral
sound Ans: — any pressure change or vibration tht is propagated
in a medium
vibration Ans: — sound source causes alternating presssure
chances in the air molecules
sound wave Ans: — compressoin+rarefraction
compression Ans: — molecules are forced together causing areas
of high pressure, mediums become compressed
rarefaction Ans: — molecules separate from each other causing
areas of low negative pressure, medium becomes more spread out
© 2025 All rights reserved
CAOHC exam Questions and Correct
Answers
Unprotected exposure to hazardous noise causes: Ans: —
Temporary and/or permanent hearing loss
Temporary and/or permanent tinnitus (ringing, buzzing in ears)
Occupational noise sources Ans: — Agriculture, mining, railroads
• Manufacturing - largest hazardous noise-exposed population
• Machinery, weapons, vehicles, tools, equipment
Noise-Induced Illness: Ans: — hearing loss and tinnitus
Occurs gradually, over time, from repeated exposures
Noise-Induced Injury: Ans: — hearing loss and tinnitus
Occurs from one significant exposure or event
Recreational noise sources Ans: — Lawn care, power tools,
equipment, firearms, music, motorcycles
AUDITORY EFFECTS OF NOISE EXPOSURE Ans: — Loss of hearing
sensitivity
• Tinnitus
• Missing parts of conversation
• Slower, inaccurate localization
• Increased errors, safety mishaps
Non-auditory effects of noise exposure Ans: — Raise blood
pressure
© 2025 All rights reserved
, 2 | Page
• Raise heart rate
• Increase stress hormone levels
• Disrupt healthy sleep patterns
• Result in possible reassignment to a different job
• Result in embarrassment, frustration, and social withdrawal
4 P'S OF NOISE-INDUCED HEARING LOSS (NIHL) Ans: — 1)Painless
2) Progressive
3) Permanent
4) Preventable
Purpose of hearing conservation program Ans: — • Prevent
occupation-related NIHL
• Job retention
• Reduce costs of hearing loss: > $240 million per year
• Promote healthy hearing and quality of life
HCP major elements Ans: — - noise hazard assesment
- noise controls
- audiometric monitoring
-hearing protection devices
-hearing conversation education
-recordkeeping
-program evaluation
CAOHC MISSION Ans: — Advancing best practices in occupational
hearing conservation worldwide, through credentialing, standards,
education, and advocacy.
CAOHC VISION Ans: — A world without occupational hearing loss
© 2025 All rights reserved
, 3 | Page
engineering controls Ans: — primary means to reduce or control
noise, dampen, enclose, or isolate noise
- use HOD obly after engeneering controls prove unfeasible
administrative controls Ans: — policies and procedures
implemented to reduce noise exposure
-standard operating proceedures (shift rotation, time in noise
limitations)
VA COHC scope of practice Ans: — In accordance with VHA
DIRECTIVE 1170.02
Checks and calibration of audiometric instrumentation
• Otoscopic screening and pure-tone air conduction threshold
testing, for the purpose of a hearing conservation program •
Otoscopy and pure-tone air conduction threshold testing without
interpretation for established patients
• Proper fitting and training of various personal hearing
protection devices
• Basic counseling of employees concerning hearing conservation
test results and employee referral
sound Ans: — any pressure change or vibration tht is propagated
in a medium
vibration Ans: — sound source causes alternating presssure
chances in the air molecules
sound wave Ans: — compressoin+rarefraction
compression Ans: — molecules are forced together causing areas
of high pressure, mediums become compressed
rarefaction Ans: — molecules separate from each other causing
areas of low negative pressure, medium becomes more spread out
© 2025 All rights reserved
