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1. Which of the following statements is NOT a concern relating to turbidity (or cloudiness) of drinking water?
   
   a. Turbidity in drinking water makes it less appealing to people. b. Organic chemicals causing turbidity can interact with chlorine which can result in potentially harmful chemicals. c. Turbidity is difficult and expensive to detect with regular laboratory testing d. Turbidity in the water may protect bacteria from disinfection chemicals.
    

2. Which of the following is a TRUE statement regarding pH and drinking water?
   
   a. pH is measured on a scale of 1 to 10. b. The normal pH range for drinking water is between 7.0 and 9.5. c. Water that is above the pH of 7.0 is considered to be acidic d. pH is the measure of water's hydrogen ion concentration.
    

3. Hardness in water is caused by significant amounts of calcium or manganese components.
   
   a. True b. False
    

4. There are two classifications of hardness:  "carbonate" or "non-carbonate".
   
   a. True b. False
    

5. The system operator should choose the chemical to remove water hardness based on whether or
   not the hardness is mostly carbonate or non-carbonate.
   
   a. True b. False
    

6. In selecting the type of chemical to use when treating water hardness, if the carbonate hardness is high,
   lime would be the chemical chosen to remove the hardness.
   
   
   a. True b. False
   
    

7. Which of the following statements is TRUE?
   
   a. Protozoans are multi-celled organisms that are only found in freshwater lakes. b. If ingested, all kinds of bacteria will cause negative health effects in humans. c. Viruses are the smallest living organisms capable of producing infection and causing disease in humans. d. Sulfur bacteria are directly associated with contamination from animal or human wastes.
   
   
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