water pollution mcqs

Q. According to the Geological survey, water with less than 1000 ml/litre of total dissolved solids is __________ Brine water Freshwater Slightly saline Moderately saline Answer: Freshwater

Q. Which of the following statements is true about the composition of Calcium Carbonate (CaCo3) in soft water? 0 to 30 milligrams of CaCO3 per litre 30 to 60 milligrams of CaCO3 per litre 60 to 90 milligrams of CaCO3 per litre 90 to 120 milligrams of CaCO3 per litre Answer: 30 to 60 milligrams

Q. Which of the following units is used for measuring the turbidity of water? EAU Formazin Attenuation Units FNU- Formazin Nephelometric Unit NTU – Nephelometric Turbidity Units All of the above Answer: All of the above.

Q. Which of the following salts are the main causes of temporary hardness? Calcium sulphate Magnesium sulphate Magnesium chloride Magnesium carbonate Answer: Magnesium carbonate.

Q. In most freshwater lakes, the algal productivity is limited by the availability of which of the following inorganic ions? Carbon Nitrogen Phosphorus All of the above Answer: Phosphorus.

Q. Which of the following techniques is used to determine the concentration of odour compounds in the given water sample? Settling Flushing Stripping Chlorination Answer: Stripping.

Q. Which of the following is a waterborne disease? Typhoid Cholera Diarrhoea All of the above Answer: All of the above

Q. What is the health effects of excess fluoride in drinking water? Fluorosis Toothaches Lung disease Intestinal infection Answer: Fluorosis.

Q. Which of the following techniques is used to remove fluorides from the water bodies? Osmosis Ion exchange Lime softening Both 2 and 3 Answer: Both 2 and 3

Q. Which of the following is mainly responsible for the causes of water pollution? Afforestation Oil refineries Paper factories Both 2 and 3 Answer: Both 2 and 3