Exam Preview for 32733: Prevention of Noise-Induced Hearing Loss fr

Prevention of Noise-Induced Hearing Loss from Recreational Firearms, presented in partnership with Seminars in Hearing

Please note: exam questions are subject to change.

1. Which of the following statements is correct? Adult females own more recreational firearms than adult males. The number of adult females who shoot recreational firearms has increased in recent years. The number of individuals who shoot recreational firearms is equally distributed across geographical regions of the U.S. Youth who hunt, start using firearms at age 15 years or older.
2. Outdoors, in a nonreverberant environment, the duration of a gunshot from a recreational firearm is extremely short, typically: Less than 10 ms More than 20 ms Less than 2 ms More than 100 ms
3. The use of a commercial sound level meter for firearm impulse noise measurements may underestimate auditory hazard for impulse noise levels at or above: ~120 dB peak SPL ~150 dB peak SPL ~140 dB peak SPL ~160 dB peak SPL
4. When measured at the left ear of the recreational shooter and compared to rifles, pistols have: Lower peak sound pressure levels than a rifle because the firearm is smaller. Lower peak sound pressure levels than a rifle because the projectiles do not break the speed of sound. Higher peak sound pressure levels than a rifle because the projectiles have more gunpowder. Higher peak sound pressure levels than a rifle because the muzzle is in closer proximity to the ear.
5. Quantifying the risk to the auditory system based on the acoustic characteristics of impulse noise are called: Waveform Criteria Cochlear Risk Criteria Damage Risk Criteria Auditory Damage Criteria
6. The peak sound pressure level limit recommendations from the World Health Organization are: 140 dB for children and 120 dB for adults. 140 dB for adults and children. 120 dB for adults and children. 120 dB for children and 140 dB for adults.
7. Which of the following is the most common reason for hunters to reject the use of passive (non-electronic) hearing protection? Cost of the device Loss of audibility Need to carry it with them in the field Not available in camouflage
8. The attenuation of impulse sounds greater than 150 dB peak sound pressure level by electronic hearing protectors is determined by which of the following? The passive attenuation characteristics of the electronic protector (e.g. electronics turned off). The attack time (speed) of the electronic circuitry. The peak clipping setting on the device. The battery supply.
9. Which of the following statements is INCORRECT? Muzzle brakes (ports) provide venting that increases the sound pressure level at the ear of the recreational shooter. There is no longer a need to use hearing protection when firing a firearm with a suppressor attached. The more unprotected shots that are fired, the greater the risk of hearing loss. Shooting in an enclosed, reflective, reverberant environment such as indoor shooting ranges or hunting blinds, increases the hazard to hearing.
10. A passive (non-electronic) earplug designed with a small-orifice filter does which of the following? Amplifies low level sounds and attenuates high level impulse sounds. Attenuates both low level and high impulse level sounds. Maintains audibility of low sound pressure levels and attenuates at high peak sound pressure levels for impulse sounds. Adequately protects the ear at all peak sound pressure levels up to 180 dB.