Q. __ is used to check water pollution caused by industrial affluents Water Hyacinth Parthenium Elephant Grass All of these Answer: Water Hyacinth

Q. The amount of dissolved solids passing through the filters in the process of filtration is called __________. Independent of suspended solids Sum of total solids and suspended solids Difference between total solids and suspended solids All of the above Answer: Difference between total solids and suspended solids.

Q. Which of the following is not a waterborne disease? Measles Typhoid Cholera Hepatitis Answer: Measles.

Q. Which of the following diseases or infections is caused due to poor water hygiene? Leprosy Trachoma Conjunctivitis All of the above Answer: All of the above.

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.