Exposition al Ruido Occupational

Occupational Noise Exposure and Audiogram - MCQs

Which of the following is the primary goal of occupational noise exposure monitoring?
- To identify workers at risk of noise-induced hearing loss
- To determine the exact cause of a worker’s hearing loss
- To ensure compliance with OSHA regulations
- To provide data for engineering noise controls
An audiogram is a graphical representation of:
- The intensity of sound in a workplace
- A person's hearing thresholds at different frequencies
- The duration of noise exposure
- The effectiveness of hearing protection devices
Which regulatory body sets permissible exposure limits (PELs) for noise in the workplace in the United States?
- Environmental Protection Agency (EPA)
- National Institute for Occupational Safety and Health (NIOSH)
- Occupational Safety and Health Administration (OSHA)
- American Conference of Governmental Industrial Hygienists (ACGIH)
Time Weighted Average (TWA) is a measure of:
- The peak noise level during a workday
- The average noise level over an 8-hour workday, taking into account duration of exposure
- The total noise dose received in a year
- The noise reduction provided by hearing protection
Which of the following frequencies is typically tested in a standard audiogram?
- 100 Hz
- 500 Hz
- 10000 Hz
- 20000 Hz
A standard threshold shift (STS) on an audiogram is defined by OSHA as:
- An average shift of 10 dB at 2000, 3000, and 4000 Hz in one or both ears
- An average shift of 5 dB at any frequency in one ear
- A shift of 20 dB at 6000 Hz in both ears
- Any change in hearing thresholds compared to baseline
What type of hearing loss is most commonly associated with occupational noise exposure?
- Conductive hearing loss
- Sensorineural hearing loss
- Mixed hearing loss
- Auditory processing disorder
Hearing protection devices (HPDs) are most effective when:
- They are used only when noise levels exceed 100 dB
- They are properly fitted and consistently worn
- They are worn only by workers with existing hearing loss
- They are the most expensive models available
The purpose of a baseline audiogram is to:
- Determine if a worker has pre-existing hearing loss before starting a noisy job
- Track changes in hearing over time
- Evaluate the effectiveness of hearing protection
- All of the above
In a hearing conservation program, what action should be taken when a worker shows a standard threshold shift (STS)?
- The worker should be immediately terminated
- The worker should be refitted with hearing protection and receive training
- The worker should be transferred to a quieter work area
- Both B and C
Octave band analysis is used to:
- Measure the overall noise level
- Determine the frequency distribution of noise
- Calculate the TWA
- Assess the effectiveness of hearing protection
Which of the following is an engineering control measure to reduce noise exposure?
- Providing hearing protection to employees
- Rotating employees to different work areas
- Enclosing noisy equipment
- Conducting annual audiometric testing
The exchange rate in noise exposure calculations refers to:
- The rate at which hearing loss progresses
- The increase in noise level that halves the allowable exposure time
- The cost of hearing protection devices
- The frequency of audiometric testing
A temporary threshold shift (TTS) is:
- A permanent hearing loss caused by a single loud noise event
- A temporary reduction in hearing sensitivity after noise exposure
- A type of conductive hearing loss
- A shift in hearing thresholds that requires immediate medical attention
What is the most important factor in preventing occupational noise-induced hearing loss?
- Providing annual audiograms
- Using the loudest hearing protection available
- Implementing a comprehensive hearing conservation program
- Replacing old equipment with new equipment
If a worker's audiogram shows a significant decline at higher frequencies (e.g., 4000 Hz and 6000 Hz), it is most likely indicative of:
- Conductive hearing loss due to earwax buildup
- Noise-induced hearing loss
- Age-related hearing loss (presbycusis)
- Ototoxicity from medication
Which component of a hearing conservation program focuses on educating employees about the hazards of noise and the importance of hearing protection?
- Noise monitoring
- Audiometric testing
- Training
- Engineering controls
A worker exposed to 85 dBA for 8 hours is at:
- No risk of hearing loss
- Exceeding the OSHA action level, requiring hearing protection
- Exceeding the OSHA permissible exposure limit (PEL)
- Required to undergo immediate medical evaluation
The term "presbycusis" refers to:
- Noise-induced hearing loss
- Age-related hearing loss
- Hearing loss due to medication
- Hearing loss due to a ruptured eardrum
Acoustic trauma results from:
- Prolonged exposure to moderate noise levels
- A single, extremely loud noise event
- Gradual deterioration of hearing with age
- Exposure to certain chemicals
What is the purpose of a sound level meter in occupational noise assessment?
- Measure air pressure
- Measure workers' hearing thresholds
- Measure the intensity of sound
- Analyze the frequency of sound
An employee's initial audiogram done shortly after starting work is called:
- Annual audiogram
- Diagnostic test
- Baseline audiogram
- Threshold test
What should a company do if noise levels cannot be reduced to acceptable levels using engineering or administrative controls?
- Ignore the problem
- Provide hearing protection
- Transfer workers to different areas
- Reduce work hours
Audiometric testing should be performed:
- In a quiet environment
- In a noisy environment to simulate work conditions
- Immediately after noise exposure
- Only if the employee complains of hearing loss
A hearing protector's Noise Reduction Rating (NRR) indicates:
- The amount of noise blocked in a real-world setting.
- The theoretical maximum noise reduction achieved in a laboratory.
- The overall comfort of the hearing protector.
- The price of the hearing protector.
What administrative control can be used to reduce noise exposure?
- Providing earplugs.
- Engineering solutions to reduce noise.
- Scheduling workers to limit their time in high-noise areas.
- Regular audiometric testing.
What frequencies are most critical for understanding human speech?
- Low frequencies (125-250 Hz).
- Mid frequencies (500-4000 Hz).
- High frequencies (6000-8000 Hz).
- All frequencies are equally important.
How often should audiometric tests be performed for workers exposed to noise levels at or above the action level?
- Every 5 years.
- Annually.
- Every 6 months.
- Only when the worker reports a problem.
What does AL stand for with regards to noise exposure?
- Action Limit
- Audible Level
- Average Loudness
- Administrative Limit
What does PEL stand for with regards to noise exposure?
- Permissible Exposure Limit
- Potential Exposure Limit
- Personal Exposure Limit
- Provisional Exposure Limit