Select the correct answer from the drop down box which follows each question. 
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1. The objective of disinfecting drinking water is to kill disease causing organisms.
   
   a. True b. False
    

2. There are several methods for disinfecting water, which of the following are most widely used in
   drinking water applications.
   
   a. Ozonation and Iodine b. Chlorine and Bromine c. Ultraviolet and Potassium Permanganate d. Overliming and Copper Sulfate
    

3. Chlorine gas will have an amber color when exposed to the air.
   
   a. True b. False
    

4. The recommended location for the exhaust fan suction point in a chlorine room is close to the floor.
   
   a. True b. False
    

5. Chlorine gas is 2.5 times heavier than air.
   
   a. True b. False
    

6. Combined chlorine residuals are the most effective at controlling disease causing bacteria.
   
   a. True b. False
    

7. Which of the following elements will create chloramines when chlorine is added to the water.
   
   a. Ferrous iron b. Ammonia c. Hydrogen sulfide d. Manganese
    

8. If you are receiving complaints on chlorine smell in the drinking water you would typically
   
   a. Turn the chlorine down to lower the residual b. Turn the chlorine up to reach break point chlorination c. Flush hydrants d. Backwash filters
    

9. The pH of most natural waters is 6.5 -- 7.5, chlorine is most effective at a higher pH
   
   a. True b. False
    

10. Gas chlorine cylinders should be located directly in front of heaters to prevent cylinders from freezing up.
    
    a. True b. False
     

11. The fusible plug on 150 pound cylinders is designed to melt out and relieve pressure in cylinder
    to prevent rupture at this temperature.
    
    a. 100 - 130 Fahrenheit d. 210 - 212 Fahrenheit b. 136 - 155 Fahrenheit c. 158 - 165 Fahrenheit
     

12. When mixing solutions of acid and water together, for liquid chlorine or fluoride you should always mix the
    
    a. Water to the acid b. Acid to the water c. Never mix together d. Any order
     

13. When replacing gas chlorine cylinders proper care should be taken to check for leaks using this method.
    
    a. Vinegar vapor b. Sense of smell c. Soap bubbles d. Ammonia vapor
     

14. Chlorine residuals in a distribution system should be taken at the furthest locations from the well or treatment plant
    
    a. True b. False
     

15. The desired amount of chlorine residual in a distribution system is
    
    a. 1.0 - 2.0 parts per million free residual b. 0.2 - 0.5 parts per million total residual c. 0.2 - 0.5 parts per million free residual d. 0.5 - 1.0 parts per million total residual
     

16. If you have a minimum free chlorine residual throughout your distribution system you have:
    
    a. Proper chloramine residual b. Overfed chlorine c. Breakpoint chlorination d. Monochloramine compound
     

17. Chlorine is safe if it is handled properly.
    
    a. True b. False
    
    
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