| # | Mud, silt, clay and other suspended matter in water that cause it to appear murky is called | cloudiness | turbulence | hardness | turbidity | none of the above | 4
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| 1 | The purpose for floridating municipal water supplies is to | disinfect the water | help prevent dental decay | remove iron | help improve the taste of the water | decrease the corrosive action of the water in pipes | 2 |
| 2 | The pH scale runs from | 0 - 14 | 0 - 15 | 1 - 14 | 1 - 15 | 7 - 14 | 1 |
| 3 | A pH value of 7.0 is considered to be | acidic | alkaline | basic | neutral | none of the above | 4 |
| 4 | The chemical most used to raise pH is | chlorine | alum | lime | calgon | carbon | 3 |
| 5 | Activated carbon is used to reduce | alkalinity | taste and odors | hardness | pH | coliform bacteria | 2 |
| 6 | Hardness in water is caused mainly by the pressence of | calcium and magnesium compounds | lime and soda ash | iron and manganese compounds | turbidity and suspended solids | excess chlorine | 1
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