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World Health Organization "Make Listening Safe" Initiative

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1.  According to WHO (2015) how many young people are at risk for hearing loss from unsafe listening practices?
  1. 110 million
  2. 1.1 billion
  3. 10 million
  4. 10 billion
2.  How many people aged 12-35 years have a "disabling" degree of hearing loss, worldwide?
  1. 43 million
  2. 4.3 million
  3. 4.3 billion
  4. 430,000
3.  What are current occupational noise exposure limits in most industrialized nations?
  1. 90 dBA for an 8-hour LAeq
  2. 85 dBA for a 24-hour LAeq
  3. 85 dBA for an 8-hour LAeq
  4. 90 dBA for a 24-hour LAeq
4.  How many people are considered at risk for material hearing impairment if exposed to 85 dBA for an 8-hour LAeq?
  1. 8%
  2. 25%
  3. 1-3%
  4. <1%
5.  What 24-hr LAeq is expected to result in <1% of exposed individuals having a hearing loss greater than predicted by age alone?
  1. 95 dBA
  2. 105 dBA
  3. 80 dBA
  4. 75 dBA
6.  What is the difference in sound level, as a function of frequency, between sound measured outside the ear vs. at the eardrum?
  1. Real Ear Insertion Gain
  2. Transfer Function of the Open Ear
  3. Real Ear Insertion Loss
  4. Input-Output function
7.  What two factors determine the sound level presented to a headphone users ear?
  1. Current and earphone sensitivity
  2. Current and capacitance
  3. Voltage and earphone sensitivity
  4. Pizza and beer
8.  For which individuals might the most restrictive noise exposure limit be appropriate?
  1. People with pre-existing hearing loss
  2. Children and other individuals not capable of making informed health decisions
  3. Stage performers
  4. A & B
9.  In personal audio systems, why is dosimetry superior to volume control level limits?
  1. Because hearing loss risk is determined by the level-over-time, rather than instantaneous sound level
  2. Because dosimetry is easier to measure than instantaneous sound level
  3. Because dosimetry can only be determined in Bluetooth enabled devices
  4. Because volume control limits have never been implemented in personal audio systems
10.  What are challenges to manufacturers implementing dosimetry into personal audio devices?
  1. Accurate prediction of the free-field equivalent sound level in an individual's ear
  2. Cost associated with developing dosimetry, without clear evidence this feature can be up-charged
  3. Knock-off devices that are rampant in some countries
  4. All of the above