Hearing Loss Hearing Loss Prevention Test 1 — Questions and Answers
Question 1: According to OSHA regulations, employers are required to implement a hearing conservation program when employee noise exposure reaches:
- 75 dBA as an 8-hour time-weighted average
- 85 dBA as an 8-hour time-weighted average (Correct answer)
- 95 dBA as an 8-hour time-weighted average
- 100 dBA as an 8-hour time-weighted average
Correct answer: 85 dBA as an 8-hour time-weighted average
OSHA's Hearing Conservation Standard (29 CFR 1910.95) requires a hearing conservation program for workers exposed to noise at or above 85 dBA as an 8-hour TWA (the action level).
Question 2: The noise reduction rating (NRR) on hearing protection devices represents:
- The maximum noise level the device can block completely
- An estimate of the noise reduction the device provides in decibels under ideal conditions (Correct answer)
- The number of hours the device can be worn safely
- The cost rating of the device
Correct answer: An estimate of the noise reduction the device provides in decibels under ideal conditions
The NRR is a measure of the noise reduction provided by a hearing protection device under ideal laboratory conditions; real-world protection is typically lower.
Question 3: Which type of hearing protection generally provides the highest NRR?
- Earmuffs
- Foam earplugs (Correct answer)
- Reusable pre-molded earplugs
- Semi-insert earplugs
Correct answer: Foam earplugs
Foam earplugs, when properly inserted, typically provide the highest NRR (often 29–33 dB) because they conform to the ear canal and seal out sound effectively.
Question 4: The safe listening time at 100 dB exposure according to WHO guidelines is approximately:
- 8 hours
- 4 hours
- 15 minutes (Correct answer)
- 1 hour
Correct answer: 15 minutes
At 100 dB, safe listening time is approximately 15 minutes per day according to WHO guidelines, as louder sounds require exponentially shorter exposure times.
Question 5: Which ototoxic medication class is commonly known to cause hearing loss and should be monitored audiologically?
- Antihistamines
- Aminoglycoside antibiotics (Correct answer)
- ACE inhibitors
- Beta blockers
Correct answer: Aminoglycoside antibiotics
Aminoglycoside antibiotics (such as gentamicin, tobramycin, and streptomycin) are well-known ototoxic medications that can damage cochlear hair cells, causing sensorineural hearing loss.
Question 6: Newborn hearing screening programs in the US are designed to identify hearing loss by:
- Age 5 before school entry
- 1 month of age with diagnosis by 3 months and intervention by 6 months (1-3-6 model) (Correct answer)
- Age 2 during well-child checkups
- Only when parents report communication concerns
Correct answer: 1 month of age with diagnosis by 3 months and intervention by 6 months (1-3-6 model)
The US Early Hearing Detection and Intervention (EHDI) program follows the 1-3-6 model: screen by 1 month, diagnose by 3 months, and enroll in early intervention by 6 months.
Hearing Loss Hearing Loss Prevention Test 1
According to OSHA regulations, employers are required to implement a hearing conservation program when employee noise exposure reaches: