CAOHC Occupational Hearing Conservationist Certification Exam — Questions and Answers

Question 1: Who is responsible for ensuring hearing conservation training reaches all affected employees?

The audiometric testing provider exclusively
OSHA directly provides all required training
The employer, through the hearing conservation program administrator (Correct answer)
Individual employees are solely responsible

Correct answer: The employer, through the hearing conservation program administrator

The employer bears the responsibility for ensuring all employees in the HCP receive required training.

Question 2: Which of the following is a valid reason for an OHC to make an immediate physician referral, independent of audiometric threshold findings?

Worker has worked in noise-exposed areas for fewer than 6 months
Worker's thresholds show a minor improvement at 4000 Hz
Worker reports that hearing protection feels uncomfortable
Worker presents with visible ear drainage, ear pain, or signs of infection (Correct answer)

Correct answer: Worker presents with visible ear drainage, ear pain, or signs of infection

Physical symptoms such as ear drainage, pain, or signs of infection indicate a medical condition requiring physician evaluation regardless of audiometric results.

Question 3: How is occupational hearing loss distinguished from other causes for workers compensation purposes?

Any hearing loss in a noise-exposed worker is automatically occupational
Through audiometric pattern analysis, noise exposure history, medical history review, and comparison with age norms (Correct answer)
Workers compensation claims do not require distinguishing causes
Only a genetic test can determine if loss is occupational

Correct answer: Through audiometric pattern analysis, noise exposure history, medical history review, and comparison with age norms

Determining work-relatedness requires evaluating audiometric configuration, exposure history, medical history, and comparison with age-corrected norms.

Question 4: An occupational hearing conservationist is measuring noise levels in a manufacturing plant. To best assess the potential risk for noise-induced hearing loss for employees, which sound level meter weighting scale should be used?

B-Weighting
C-Weighting
Z-Weighting (Flat)
A-Weighting (Correct answer)

Correct answer: A-Weighting

A-weighting (dBA) is the standard for occupational noise measurements because it mimics the frequency response of the human ear and has been shown to correlate well with the risk of noise-induced hearing loss. C-weighting is less sensitive to low frequencies and is often used for measuring peak sound pressure levels or entertainment noise. Z-weighting has a flat response and does not account for the ear's varying sensitivity to different frequencies.

Question 5: What is the purpose of noise contour mapping in a workplace?

To determine the frequency content of machinery noise
To measure each individual worker personal noise exposure
To create a visual representation of noise levels across the facility for identifying high-exposure areas (Correct answer)
To calculate the building acoustic insulation rating

Correct answer: To create a visual representation of noise levels across the facility for identifying high-exposure areas

Noise contour maps show spatial distribution of noise levels, helping identify areas where workers need protection.

Question 6: According to OSHA regulations (29 CFR 1910.95), a Standard Threshold Shift (STS) is defined as a change in hearing threshold, relative to the baseline audiogram, of an average of:

15 dB or more at 500, 1000, and 2000 Hz in both ears.
10 dB or more at 1000, 2000, and 3000 Hz in either ear.
15 dB or more at 2000, 3000, and 4000 Hz in either ear.
10 dB or more at 2000, 3000, and 4000 Hz in either ear. (Correct answer)

Correct answer: 10 dB or more at 2000, 3000, and 4000 Hz in either ear.

OSHA's definition of a Standard Threshold Shift is very specific. It is a change in hearing threshold of an average of 10 decibels (dB) or more at the frequencies of 2000, 3000, and 4000 Hz in either ear when comparing the current audiogram to the baseline audiogram.

Question 7: Which of the following is NOT a required element of OSHA's hearing conservation program?

Hearing protection devices
Noise monitoring
Employer-purchased custom hearing aids for all workers (Correct answer)
Audiometric testing program

Correct answer: Employer-purchased custom hearing aids for all workers

OSHA requires employers to provide HPDs for prevention, not to purchase custom hearing aids, which are a medical treatment.

Question 8: How often must OSHA-mandated audiometric testing be performed for workers in a hearing conservation program?

Only at hire and termination
Every 2 years
Every 6 months
Annually (Correct answer)

Correct answer: Annually

OSHA requires annual audiometric testing for all workers included in the hearing conservation program to monitor for changes in hearing thresholds.

Question 9: What are the non-auditory health effects of chronic noise exposure?

Noise exclusively affects the auditory system
Noise only causes headaches that resolve immediately
Cardiovascular stress, sleep disturbance, elevated cortisol, hypertension, and reduced cognitive performance (Correct answer)
There are no effects other than hearing loss

Correct answer: Cardiovascular stress, sleep disturbance, elevated cortisol, hypertension, and reduced cognitive performance

Chronic noise produces cardiovascular stress, elevated blood pressure, sleep disruption, hormonal changes, and impaired cognitive function.

Question 10: What is the most important takeaway about communication strategies for CAOHC-certified OHCs?

OHCs should focus exclusively on audiometric testing and leave communication issues to others
Effective communication is a critical safety issue, and the OHC must be both a skilled communicator and an advocate for communication accessibility (Correct answer)
Communication strategies are a minor topic with no real impact on hearing conservation
Technology has solved all workplace communication problems for hearing-impaired workers

Correct answer: Effective communication is a critical safety issue, and the OHC must be both a skilled communicator and an advocate for communication accessibility

The CAOHC-certified OHC must understand that communication is fundamental to workplace safety and quality of life. Being a skilled communicator themselves and advocating for communication accessibility throughout the workplace are essential professional competencies.

Question 11: Which of the following actions is an example of an administrative control for reducing noise exposure?

Building a sound-proof barrier between a noisy machine and the operator's workstation.
Changing work schedules to limit the amount of time any single employee spends in a high-noise environment. (Correct answer)
Providing employees with a selection of high-NRR hearing protectors.
Implementing a 'Buy Quiet' policy for all new equipment purchases.

Correct answer: Changing work schedules to limit the amount of time any single employee spends in a high-noise environment.

Administrative controls involve changes to work practices or procedures to reduce exposure. Limiting the time an employee spends in a noisy area through job rotation or altered schedules is a classic example of an administrative control. [8, 9] Building a barrier is an engineering control, providing hearing protectors is PPE, and a 'Buy Quiet' policy is a form of substitution or elimination.

Question 12: What does OSHA require employers to provide regarding hearing protectors for employees at or above the action level?

Hearing protectors only after an STS has been confirmed
Hearing protectors only if the employee requests them
A variety of suitable hearing protectors at no cost (Correct answer)
Only one type of hearing protector approved by OSHA

Correct answer: A variety of suitable hearing protectors at no cost

OSHA requires employers to make hearing protectors available at no cost and provide a selection of suitable types.

Question 13: What is the most common cause of occupational hearing loss?

Overuse of earplugs
Poor nutrition
Prolonged exposure to high levels of noise (Correct answer)
Lack of sleep

Correct answer: Prolonged exposure to high levels of noise

Occupational hearing loss is predominantly caused by repeated or prolonged exposure to excessive noise levels in the workplace. High-intensity sound damages the delicate hair cells in the inner ear, leading to permanent hearing impairment. This makes noise control and hearing conservation programs vital for worker safety.

Question 14: What is the recommended frequency for conducting comprehensive noise surveys?

Every 10 years as specified by OSHA
Whenever there are changes in production, processes, equipment, or controls, and periodically to confirm conditions (Correct answer)
Only when an employee files a noise complaint
Once when the program is first established, then never again

Correct answer: Whenever there are changes in production, processes, equipment, or controls, and periodically to confirm conditions

Noise surveys should be repeated whenever significant changes could alter exposure levels.

Question 15: An employee consistently fails their annual hearing test, showing a persistent Standard Threshold Shift (STS). They state they are using their issued foam earplugs correctly. During a fitting assessment, you observe them pushing the earplug straight into the ear canal without any other steps. What is the MOST critical initial step to correct their fitting technique?

Telling them to insert the earplug deeper into the ear canal.
Recommending they try a different type of hearing protection device immediately.
Instructing them to roll the earplug into a tight, crease-free cylinder.
Advising them to pull the outer ear (pinna) up and back before insertion. (Correct answer)

Correct answer: Advising them to pull the outer ear (pinna) up and back before insertion.

To ensure a proper fit for an earplug, the ear canal must be straightened. The most effective way to do this is by reaching over the head with the opposite hand and pulling the pinna (outer ear) up and back. This action opens the ear canal, allowing for deeper and more effective insertion of the earplug. While rolling the plug is also a crucial step, straightening the canal is paramount for overcoming the natural bends that can otherwise block the plug from being inserted correctly.

Question 16: What is a 'sentinel event' in the context of ototoxic exposure monitoring within a hearing conservation program?

An unexpected threshold shift in a worker that signals potential ototoxic exposure to the wider workforce (Correct answer)
The first audiogram ever conducted at a facility
A scheduled calibration check of the audiometer
A routine annual hearing test with no abnormal findings

Correct answer: An unexpected threshold shift in a worker that signals potential ototoxic exposure to the wider workforce

A sentinel event is an unexpected audiometric finding in one worker that may indicate a broader ototoxic exposure problem affecting others in the same work area. It triggers investigation of workplace chemical exposure conditions.

Question 17: What advantage do custom-molded earplugs offer over disposable foam plugs?

They always provide higher NRR than any foam plug
Consistent fit and attenuation due to being shaped to the individual ear canal (Correct answer)
They are required by OSHA for all noise-exposed workers
They never need replacement or cleaning

Correct answer: Consistent fit and attenuation due to being shaped to the individual ear canal

Custom-molded earplugs provide a personalized and consistent fit that can reduce variability in real-world attenuation.

Question 18: An audiometric testing program uses three different audiometers. What calibration practice ensures data consistency across all three instruments?

All three audiometers must be calibrated to the same ANSI reference standards using traceable calibration equipment (Correct answer)
Each audiometer can use its own reference levels
Rotating workers between audiometers eliminates the need for consistent calibration
Only the most expensive audiometer needs calibration

Correct answer: All three audiometers must be calibrated to the same ANSI reference standards using traceable calibration equipment

All audiometers must be calibrated to the same ANSI S3.6 reference standards using equipment with traceable calibration to the National Institute of Standards and Technology. This ensures that a threshold measured on one instrument matches the result on any other.

Question 19: How should the OHC address communication challenges during noisy shift changes when critical information is being exchanged?

Use radio communication only during shift changes
Schedule hearing-impaired workers for shifts that do not have change-over overlap
Shift changes are too noisy for any communication to be effective
Recommend written shift-change reports, face-to-face briefings in quieter areas, and visual task boards for hearing-impaired workers (Correct answer)

Correct answer: Recommend written shift-change reports, face-to-face briefings in quieter areas, and visual task boards for hearing-impaired workers

Shift changes often involve critical safety and operational information exchanged in noisy conditions. Written shift reports, briefings in designated quiet areas, and visual task boards ensure hearing-impaired workers receive all essential information during these transitions.

Question 20: Why is noise-induced hearing loss considered a preventable occupational disease?

Because it is not a real disease
Because it can be cured with medication if detected early
Because it only occurs in workers who refuse to wear protectors
Because the cause is known and effective controls, protectors, and monitoring programs can prevent it (Correct answer)

Correct answer: Because the cause is known and effective controls, protectors, and monitoring programs can prevent it

NIHL is entirely preventable because the causative agent is identifiable, measurable, and effective prevention strategies exist.

Question 21: The Federal Railroad Administration (FRA) Noise Exposure regulation (49 CFR Part 227) requires that hearing conservation programs be implemented for certain railroad employees. What is the continuous noise exposure action level that triggers this requirement?

An 8-hour TWA of 90 dBA (Correct answer)
An 8-hour TWA of 85 dBA
A 12-hour TWA of 85 dBA
A 12-hour TWA of 90 dBA

Correct answer: An 8-hour TWA of 90 dBA

Unlike OSHA's general industry standard which has an action level of 85 dBA, the FRA's action level for implementing a hearing conservation program, as stated in 49 CFR 227, is an 8-hour TWA of 90 dBA. This is a key distinction between the two regulations.

Question 22: A miner's full-shift noise exposure is measured at a 106 dBA TWA. Under the MSHA noise regulation (30 CFR Part 62), what specific hearing protection action is required that is not explicitly mandated by the general industry OSHA standard at this level?

The miner must wear dual hearing protection (e.g., earplugs and earmuffs). (Correct answer)
The miner must be offered a variety of hearing protectors.
The miner must be enrolled in a hearing conservation program.
The miner must undergo audiometric testing within 6 months.

Correct answer: The miner must wear dual hearing protection (e.g., earplugs and earmuffs).

MSHA's regulation at 30 CFR 62.140 establishes a "dual hearing protection level" at a TWA of 105 dBA. For exposures exceeding this level, miners must wear both an earplug and an earmuff type protector. OSHA's general industry standard does not have a specific TWA level that automatically mandates dual protection, although it may be necessary to achieve adequate attenuation.

Question 23: Which engineering control technique reduces noise by preventing vibration transmission between machinery and structures?

Acoustic absorption panels on walls
Vibration isolation using resilient mounts or pads (Correct answer)
Administrative rotation of workers
Increasing the distance between workers and equipment

Correct answer: Vibration isolation using resilient mounts or pads

Vibration isolation mounts prevent mechanical vibrations from machinery from being transmitted to structures that can radiate noise.

Question 24: What is the value of benchmarking a hearing conservation program against NIOSH criteria for an 'effective' program?

NIOSH criteria only apply to government workplaces
NIOSH criteria provide evidence-based standards that identify specific areas where a program exceeds or falls short of best practice (Correct answer)
NIOSH criteria are outdated and no longer relevant
Only OSHA compliance matters, not NIOSH recommendations

Correct answer: NIOSH criteria provide evidence-based standards that identify specific areas where a program exceeds or falls short of best practice

NIOSH provides evidence-based criteria for effective hearing conservation programs that often exceed minimum OSHA requirements. Benchmarking against these criteria helps programs identify areas where they can improve beyond basic compliance toward optimal worker protection.

Question 25: How long must employers retain employee audiometric test records under OSHA's HCP standard?

5 years
10 years
For the duration of employment only
For the duration of employment plus 30 years (Correct answer)

Correct answer: For the duration of employment plus 30 years

OSHA requires audiometric records to be retained for the duration of employment plus 30 years due to the latency of noise-induced hearing loss.

Question 26: What is the function of the Eustachian tube?

To transmit sound vibrations from outer to inner ear
To equalize air pressure between the middle ear cavity and atmospheric pressure (Correct answer)
To produce cerebrospinal fluid for the inner ear
To protect the cochlea from excessive noise

Correct answer: To equalize air pressure between the middle ear cavity and atmospheric pressure

The Eustachian tube connects the middle ear to the nasopharynx and opens during swallowing and yawning to equalize pressure.

Question 27: How often must audiometers used in occupational hearing conservation programs receive exhaustive calibration?

At least annually (Correct answer)
Every 5 years
Only when purchased new
Monthly

Correct answer: At least annually

OSHA requires exhaustive (electroacoustic) calibration of audiometers at least annually. This comprehensive calibration verifies that the audiometer's output meets ANSI specifications across all frequencies and intensity levels.

Question 28: What does a flat audiometric configuration across all frequencies most likely indicate?

Noise-induced hearing loss from impulse noise
Normal hearing with equipment calibration error
Conductive hearing loss or a middle ear disorder (Correct answer)
Ototoxic medication exposure

Correct answer: Conductive hearing loss or a middle ear disorder

A flat audiometric pattern with roughly equal loss across frequencies is more characteristic of conductive hearing loss or middle ear pathology rather than noise-induced hearing loss.

Question 29: A manufacturing facility has a work area with a consistent noise level of 95 dBA. According to the OSHA standard, which uses a 5-dB exchange rate, what is the maximum permissible exposure time for a worker in this area during a single day?

8 hours
1 hour
2 hours
4 hours (Correct answer)

Correct answer: 4 hours

The OSHA Permissible Exposure Limit (PEL) is 90 dBA for an 8-hour TWA. The standard uses a 5-dB exchange rate, meaning that for every 5 dB increase in noise, the permissible exposure time is halved. [1, 5] Since 95 dBA is 5 dB above the 90 dBA PEL, the allowed time is cut in half from 8 hours to 4 hours. [17]

Question 30: What is the significance of testing at 8000 Hz in occupational audiometry?

OSHA does not require testing at 8000 Hz
It detects hearing loss caused exclusively by ototoxic chemicals
It helps distinguish noise-induced hearing loss from presbycusis by showing recovery from the 4000 Hz notch (Correct answer)
It is the primary frequency used for STS calculation

Correct answer: It helps distinguish noise-induced hearing loss from presbycusis by showing recovery from the 4000 Hz notch

Testing at 8000 Hz is valuable because noise-induced hearing loss typically shows partial recovery at 8000 Hz after the characteristic notch at 4000 Hz, while presbycusis continues to decline.

Question 31: What is the decibel scale and why is it used to measure sound?

A binary scale indicating whether sound is safe or hazardous
A logarithmic scale that compresses the enormous range of human hearing into manageable numbers (Correct answer)
A frequency-based scale measuring pitch
A linear scale that directly measures air pressure in Pascals

Correct answer: A logarithmic scale that compresses the enormous range of human hearing into manageable numbers

The decibel compresses the vast range of human hearing (from 20 micropascals to 200 Pascals) into a practical 0-140 dB scale.

Question 32: Which part of the ear is responsible for converting mechanical sound vibrations into electrical signals that are sent to the brain?

Ossicles
Tympanic Membrane (Eardrum)
Organ of Corti (Correct answer)
Eustachian Tube

Correct answer: Organ of Corti

The Organ of Corti, located in the cochlea of the inner ear, contains hair cells that are the sensory receptors for hearing. These cells transduce the mechanical energy of sound vibrations into electrical nerve impulses. The tympanic membrane vibrates in response to sound waves, the ossicles amplify these vibrations, and the Eustachian tube equalizes pressure.

Question 33: What is the primary mechanism of noise-induced hearing loss at the cellular level?

Destruction of cochlear hair cell stereocilia through mechanical damage and metabolic stress (Correct answer)
Perforation of the tympanic membrane from loud sounds
Dissolution of the ossicles in the middle ear
Swelling of the auditory nerve from overstimulation

Correct answer: Destruction of cochlear hair cell stereocilia through mechanical damage and metabolic stress

Noise-induced hearing loss primarily results from damage to the stereocilia on the outer and inner hair cells of the cochlea.

Question 34: Which combination of elements is required for a complete OSHA-compliant hearing conservation program?

Only audiometric testing and HPD distribution
Only noise monitoring and recordkeeping
Noise monitoring, audiometric testing, HPDs, training, and recordkeeping (Correct answer)
Medical surveillance and workers' compensation administration

Correct answer: Noise monitoring, audiometric testing, HPDs, training, and recordkeeping

OSHA's HCP standard requires all five elements: noise monitoring, audiometric testing, HPDs, training, and recordkeeping.

Question 35: What term describes the number of complete cycles a sound wave completes per second?

Intensity
Amplitude
Phase
Frequency (Correct answer)

Correct answer: Frequency

Frequency, measured in Hertz (Hz), is defined as the number of complete wave cycles occurring per second. Frequency determines the pitch of a sound — higher frequency corresponds to a higher perceived pitch. It is distinct from amplitude, which relates to loudness.

Question 36: What is the difference between NRR and NRR(SF) ratings?

NRR is a US metric while SNR is used only in Asia
NRR is for earplugs only and SNR is for earmuffs only
NRR uses trained subjects for testing; NRR(SF) uses naive subjects for more realistic estimates (Correct answer)
They are identical ratings from different manufacturers

Correct answer: NRR uses trained subjects for testing; NRR(SF) uses naive subjects for more realistic estimates

The NRR uses trained, supervised subjects and tends to overestimate. The NRR(SF) uses naive, unsupervised subjects for more realistic values.

Question 37: An employee's annual audiogram reveals an average threshold shift of 15 dB at 2000, 3000, and 4000 Hz in their right ear when compared to their baseline. What is the immediate next step for the Occupational Hearing Conservationist (OHC)?

Fit the employee with new, higher-rated hearing protection.
Immediately refer the employee to a physician for a medical evaluation.
Record the shift as a permanent work-related injury on the OSHA 300 log.
Schedule a retest within 30 days to determine if the shift is persistent. (Correct answer)

Correct answer: Schedule a retest within 30 days to determine if the shift is persistent.

OSHA defines a Standard Threshold Shift (STS) as an average change from baseline of 10 dB or more at 2000, 3000, and 4000 Hz. When an STS is identified, the recommended procedure is to retest within 30 days to confirm if the shift is temporary or persistent before taking further action like referral or recordkeeping.

Question 38: Which metric is most commonly used to assess the overall effectiveness of a hearing conservation program?

Standard Threshold Shift (STS) rate among enrolled workers (Correct answer)
Number of hearing protectors distributed
Annual training attendance rate
Cost per audiometric test

Correct answer: Standard Threshold Shift (STS) rate among enrolled workers

The STS rate — the percentage of enrolled workers experiencing a standard threshold shift — is the most direct measure of program effectiveness. A low and declining STS rate indicates the program is successfully preventing hearing loss.

Question 39: Which calibration check specifically verifies that the audiometer's output increases by the correct amount with each step of the dial?

Rise/fall time check
Attenuator linearity check (Correct answer)
Frequency accuracy check
Harmonic distortion check

Correct answer: Attenuator linearity check

The attenuator linearity check verifies that each step of the intensity control produces the correct change in output. Each 5 dB step on the attenuator must produce exactly 5 dB of change in the acoustic output across the entire intensity range.

Question 40: A Certified Occupational Hearing Conservationist (COHC) identifies an audiogram with a potential STS and significant differences between ears. Which of the following is the most appropriate next step for the COHC?

Refer the problem audiogram to the Professional Supervisor for review. (Correct answer)
Inform the employee they have permanent work-related hearing loss.
Independently diagnose the cause of the hearing loss.
Immediately revise the employee's baseline audiogram.

Correct answer: Refer the problem audiogram to the Professional Supervisor for review.

The scope of practice for a COHC includes identifying problem audiograms, but the review and determination of next steps, such as the need for further evaluation or diagnosis, must be done by a Professional Supervisor (an audiologist, otolaryngologist, or other physician).

Question 41: What OSHA recordkeeping requirement applies to noise exposure measurement records?

Measurements must be retained for at least 2 years (Correct answer)
Measurements must be retained for the duration of employment
Measurements must be retained for 30 years
No retention period is specified

Correct answer: Measurements must be retained for at least 2 years

OSHA requires that noise exposure measurement records be retained for at least 2 years. This retention period allows for reference during subsequent monitoring comparisons and OSHA inspections.

Question 42: What is the Noise Reduction Rating (NRR)?

A measure of how well employees can hear instructions
The decibel level at which hearing protection becomes necessary
A measure of the total noise level in the environment
A rating that indicates the effectiveness of a hearing protection device in reducing noise (Correct answer)

Correct answer: A rating that indicates the effectiveness of a hearing protection device in reducing noise

The Noise Reduction Rating (NRR) is a standardized measure used to indicate the potential effectiveness of a hearing protection device in reducing noise exposure. It is expressed in decibels (dB) and represents the amount of noise reduction an average user can expect when the device is worn correctly. A higher NRR signifies greater noise attenuation.

Question 43: What is 'clear speech' in the context of communicating with hearing-impaired workers?

Whispering to reduce noise competition
A speaking style that uses slightly slower rate, precise articulation, and natural pauses without shouting (Correct answer)
Speaking extremely slowly and loudly
Using only single-word commands

Correct answer: A speaking style that uses slightly slower rate, precise articulation, and natural pauses without shouting

Clear speech involves speaking at a slightly slower rate with precise articulation, strategic pauses between phrases, and a naturally raised (but not shouted) voice. Research shows this approach improves speech understanding by 15-20% for hearing-impaired listeners.

Question 44: What is the correct placement of color-coded audiometric headset earphones on the test subject?

Either color on either ear based on preference
Red on the left ear, blue on the right ear
Red on the right ear, blue on the left ear (Correct answer)
Yellow over both ears simultaneously

Correct answer: Red on the right ear, blue on the left ear

Standard audiometric protocol places the red earphone on the right ear and the blue on the left, following universal color coding.

Question 45: What is the significance of the '14-hour noise-free period' requirement before a baseline audiogram and how does it relate to booth considerations?

It means the booth must be unused for 14 hours before each test
It allows temporary threshold shifts to recover; the booth ensures testing conditions are quiet enough for valid measurement (Correct answer)
It is the time needed for the booth to cool down
It refers to the audiometer warm-up time

Correct answer: It allows temporary threshold shifts to recover; the booth ensures testing conditions are quiet enough for valid measurement

The 14-hour quiet period allows any temporary threshold shift from noise exposure to recover before baseline testing. The audiometric booth then provides the quiet environment needed to accurately measure the worker's recovered baseline hearing levels.

Question 46: What is the importance of management commitment in an HCP?

Management need only sign the policy document
Management support ensures adequate funding, enforcement, and priority, which correlates with program effectiveness (Correct answer)
Management commitment only matters in large programs
Management involvement is optional

Correct answer: Management support ensures adequate funding, enforcement, and priority, which correlates with program effectiveness

Research shows management commitment is the single strongest predictor of hearing conservation program effectiveness.

Question 47: How does doubling the distance from a point noise source affect the sound level in a free field?

Sound level decreases by approximately 3 dB
Sound level decreases by approximately 6 dB (Correct answer)
Sound level decreases by approximately 10 dB
Sound level remains unchanged

Correct answer: Sound level decreases by approximately 6 dB

In a free field, doubling the distance from a point source results in a 6 dB reduction in sound pressure level per the inverse square law.

Question 48: What is the purpose of tone rise and fall time specifications in audiometer calibration?

To determine how fast the audiometer processes data
To prevent audible clicks or transient sounds that could cue the listener when tones start and stop (Correct answer)
To measure the speed of the audiometer's cooling fan
To set the timing for automatic test sequences

Correct answer: To prevent audible clicks or transient sounds that could cue the listener when tones start and stop

Tone rise and fall times specify how quickly the test tone ramps up and down when presented and terminated. Times that are too short produce audible clicks, while times that are too long make it difficult for the listener to detect tone onset.

Question 49: What role does noise monitoring play in a hearing conservation program?

It tracks the number of employees in the workplace
It records communication patterns among workers
It measures the levels of noise exposure to determine risk and necessary protections (Correct answer)
It enhances the company’s public image

Correct answer: It measures the levels of noise exposure to determine risk and necessary protections

Noise monitoring is foundational to a hearing conservation program as it involves systematically measuring and documenting noise levels in the workplace. This data is crucial for identifying areas and tasks with hazardous noise, assessing employee exposure, and determining what engineering controls, administrative controls, or personal hearing protection devices are necessary. This ensures compliance with regulations and effectively protects workers' hearing.

Question 50: When is dual hearing protection (earplugs plus earmuffs) recommended?

When a single protector achieves an NRR above 30
Only during audiometric testing
When workplace noise exceeds 100 dBA TWA (Correct answer)
For all employees regardless of noise level

Correct answer: When workplace noise exceeds 100 dBA TWA

Dual protection is recommended when noise levels exceed 100 dBA TWA, as single protectors may not provide sufficient attenuation.

Question 51: Which of the following is NOT a required core element of an OSHA-compliant Hearing Conservation Program (HCP) under 29 CFR 1910.95?

Providing a selection of suitable hearing protectors.
Audiometric testing for all exposed employees.
Noise monitoring and exposure assessment.
Mandatory job rotation for all employees exposed above the PEL. (Correct answer)

Correct answer: Mandatory job rotation for all employees exposed above the PEL.

The required elements of an HCP are noise monitoring, audiometric testing, hearing protection, employee training, and recordkeeping. While job rotation can be an administrative control for noise, it is not a universally mandated component of every HCP under the standard.

Question 52: Under OSHA's Hearing Conservation Amendment (29 CFR 1910.95), which finding most clearly requires referral to a physician or audiologist?

A 5 dB shift at any single frequency from baseline
Any audiogram showing thresholds above 15 dB HL
A worker complaint of ringing in the ears after a single shift
A confirmed Standard Threshold Shift (STS) of 10 dB average at 2000, 3000, and 4000 Hz (Correct answer)

Correct answer: A confirmed Standard Threshold Shift (STS) of 10 dB average at 2000, 3000, and 4000 Hz

OSHA defines STS as a 10 dB or greater average shift at 2000, 3000, and 4000 Hz, and a confirmed STS triggers the mandatory referral requirement.

Question 53: What is the OSHA provision regarding workers who are temporarily absent from the hearing conservation program?

Workers on leave are permanently removed from the program
No re-entry procedures are required regardless of absence duration
Workers must complete an entirely new baseline audiogram after any absence
Workers returning from absence must receive a new annual audiogram and updated training before resuming noise-exposed duties (Correct answer)

Correct answer: Workers returning from absence must receive a new annual audiogram and updated training before resuming noise-exposed duties

Workers returning from extended absence should receive an updated annual audiogram and training. While OSHA does not specify exact re-entry procedures, best practice ensures returning workers have current audiometric records and training before noise exposure resumes.

CAOHC Occupational Hearing Conservationist Certification Exam

The CAOHC OHC certification exam validates competency in occupational hearing conservation, covering audiometric testing, noise measurement, hearing protection, and program administration under OSHA standards.

Questions

75 min

Time Limit

70%

To Pass

Checking for saved progress...

Exam Rules

You can skip questions and return to them later
Flag questions for review before submitting
No feedback shown until you submit the entire exam
Unanswered questions count as wrong — answer everything
10 pretest questions are mixed in and don't affect your score
Timer auto-submits when time runs out
Your progress is auto-saved every 30 seconds

These practice questions were written with AI tools. They are not real exam questions. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy

Sources & references

Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy

caohc.org — Test delivery, score validity, exam format, passing score, retake fee, retake policy, score release, time limit, renewal, eligibility · verified Oct 2026