Q. If the water is brown in colour it indicates the presence of which of these?

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Q. How is Iron removed?

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Q. What is the safe limit for iron in the water?

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Q. What is the safe limit for manganese in water?

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Q. What is the method used to delay the precipitation of oxidized manganese and iron?

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Q. What is the concentration of dissolved oxygen required to oxidize 1 ppm of iron?

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Q. What is the concentration of dissolved oxygen required to oxidize 1 ppm of manganese?

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Q. Which of these methods is not used for the removal of arsenic?

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Q. Considering the total cost which of these is the most expensive method to remove arsenic?

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Q. Which of these is the most efficient method to remove arsenic?

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Q. Which is the common indicator organism used in the evaluation of drinking water?

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Q. Which is the common indicator organism used in the evaluation of wastewater?

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Q. Surface water contains approximately 1,000 times more indicator organisms than domestic wastewater.

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Q. Which year was the Safe Drinking Water Act passed?

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Q. The solution to pollution is _______

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Q. ________ means the deactivation or killing of pathogens.

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Q. Sterilization is a process related to disinfection.

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Q. Which of the following is not a chemical disinfectant?

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Q. Which of the following is not a physical disinfection means?

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Q. ________ is the process where all the living micro-organisms, including bacterial spores are killed.

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