Z4B051 VOL 3 EC3 Practice Test

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  • 1 . (446) The 95th percentile exposure estimates
    a value above which about 5 percent of exposures occur
  • 2 . 95. (447) Why would you develop a histogram when analyzing environmental health data?
    Develop a time series plot. velop a scatter plot
  • 3 . (428) What item must be field checked but cannot be calibrated?
    Hand-held sampling pump
  • 4 . (416) You perform heterotrophic plate counts for swimming pools to
    measure changes in the swimming pool treatment process
  • 5 . (412) When sterilizing a water tap, what is the percentage of chlorine solution you should use and how long should the tap be immersed in the solution?
    1 percent chlorine solution; 0.5 minutes
  • 6 . (407) What is the definition of quality control?
    the steps to be taken to determine validity of sampling and analytical procedures
  • 7 . (428) When calibrating a Photo Ionization Detector/Flame Ionization Detector (PID/FID), how many Tedlar sample bags need to be filled?
    Three
  • 8 . (428) Why is a single “blank” run sufficient as an operational check for the HAPSITE?
    The HAPSITE contains internal gas standards
  • 9 . (403) A 15-minute time weighted average (TWA) short-term exposure limit is known as a
    Short-term Exposure Limit (STEL)
  • 10 . (412) When collecting potable water samples for bacteriological analysis, you should adhere to all of the following guidelines except which one?
    Always flush out the bottle before taking the sample.