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DFCCIL_CE _Quiz 33

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Question 1

What is the maximum permissible limit of fluoride in drinking water?

Question 2

Which of the following do not represent direct health threat?

Question 3

Temporary hardness in water is caused by

Question 4

Decomposition of protein in waste water cause the presence of

Question 5

The waste water of a certain large colony contains 10–5.6 mmol/l of OH– ions at 25 ºC.
The pH of this sample is

Question 6

Consider the following statements regarding removal of impurities from water:
1) Settleable solids are removed by filtration.
2) Volatile solids are removed through sedimentation.
3) Dissolved solids are removed through reverse osmosis.
4) Colloidal solids are removed by coagulation.
Which of the above statements are correct?
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