Which of the following is a way to use water economically?

Which of the following inhibits the seepage of rainwater into ground?

Which of the following rivers is called the world’s most polluted river?

Which of the following are the primary causes of water pollution?

Which of the following is mainly responsible for the causes of water pollution?

Which of the following salts are the main causes of temporary hardness?

According to the Geological survey, water with less than 1000 ml/litre of total dissolved solids is __________.

In most freshwater lakes, the algal productivity is limited by the availability of which of the following inorganic ions?

Which of the following is a waterborne disease?

What is the health effects of excess fluoride in drinking water?

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