Enlisted Expeditionary Warfare Specialist (EXW) Practice Test

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What is the minimum noise level that requires hearing protection?

84 dBa
74 dBa
22 F
140 dBa

The correct answer is: 84 dBa

The minimum noise level that requires hearing protection is 84 dBa. This standard is based on guidelines set by organizations like the Occupational Safety and Health Administration (OSHA), which state that exposure to noise levels at or above 85 dBa for an eight-hour work shift can lead to hearing damage. Therefore, the threshold for when hearing protection is necessary is set at 84 dBa, a level where prolonged exposure could start to pose a risk to hearing health. Other options, such as 74 dBa, are below this threshold, meaning they do not typically require hearing protection in most work environments. Meanwhile, 140 dBa represents an extremely loud noise level that could cause immediate harm, but it is above the minimum requirement for protection and assumes the need for protective measures far beyond standard hearing protection. The reference to 22 F is unrelated to noise levels and does not pertain to hearing protection guidelines at all.