Oklahoma Electrical Practice Exam

Which of the following is NOT an acceptable form of hearing protection?

1. Ear muffs

2. Foam earplugs

3. Cotton inserted into the ear

4. Plastic ear covers

The correct answer is: Cotton inserted into the ear

Hearing protection is critical for preventing noise-induced hearing loss, especially in environments with high decibel levels. Ear muffs and foam earplugs are specifically designed and tested to provide a measurable level of sound attenuation, effectively reducing the sound pressure that reaches the eardrum. They are made from materials that absorb sound and fit snugly in or over the ear to create a seal. Cotton inserted into the ear does not provide a reliable or effective barrier against harmful noise levels. While it may appear to offer some protection, cotton lacks the necessary density and fit to reduce noise exposure sufficiently. Furthermore, it can become dislodged or allow sound to leak around it, contrary to the purpose of proper hearing protection. Plastic ear covers, like ear muffs, also serve the function of protecting the ears from loud sounds, typically through a covering that creates a noisy barrier around the ears. They are designed for safety and comfort while being effective against noise pollution. Overall, only specifically designed hearing protection devices should be relied upon to ensure adequate protection in noisy environments.