Q. According to the Geological survey, water with less than 1000 ml/litre of total dissolved solids is __________ Brine waterFreshwaterSlightly salineModerately 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 litre30 to 60 milligrams of CaCO3 per litre60 to 90 milligrams of CaCO3 per litre90 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 UnitsFNU- Formazin Nephelometric UnitNTU – Nephelometric Turbidity UnitsAll of the above Answer: All of the above.

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

Q. In most freshwater lakes, the algal productivity is limited by the availability of which of the following inorganic ions? CarbonNitrogenPhosphorusAll 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? SettlingFlushingStrippingChlorination Answer: Stripping.

Q. Which of the following is a waterborne disease? TyphoidCholeraDiarrhoeaAll of the above Answer: All of the above

Q. What is the health effects of excess fluoride in drinking water? FluorosisToothachesLung diseaseIntestinal infection Answer: Fluorosis.

Q. Which of the following techniques is used to remove fluorides from the water bodies? OsmosisIon exchangeLime softeningBoth 2 and 3 Answer: Both 2 and 3

Q. Which of the following is mainly responsible for the causes of water pollution? AfforestationOil refineriesPaper factoriesBoth 2 and 3 Answer: Both 2 and 3

Q. Chlorofluorocarbon are nonflammable chemicals mainly used in _________. PerfumesRefrigeratorsAir conditionersAll of the above Answer: All of the above.

Q. Which of the following salts is the main cause of permanent hardness of water? Magnesium sulphateMagnesium bicarbonateMagnesium carbonateNone of the above Answer: Magnesium sulphate.