Q. According to The United States Geological Survey, water having less than 1000 ml/litre of total dissolved solids is Fresh waterSlightly salineModerately salineBrine water Answer: Fresh water

Q. In filtration, the amount of dissolved solids passing through the filters is Difference between total solids and suspended solidsSum of total solids and suspended solidsIndependent of suspended solidsNone of the above Answer: Difference between total solids and suspended solids

Q. Step of sewage water treatment in which there is some aeration and organic material is converted to inorganic materials is called Primary sewage treatmentSecondary sewage treatmentActivated sludge treatmentChlorination Answer: Secondary sewage treatment

Q. What is second step of raw water treatment? SedimentationCoagulationFiltrationChlorination Answer: Coagulation

Q. What is first step of raw water treatment? ChlorinationFiltrationCoagulationSedimentation Answer: Sedimentation

Q. A technique used to determine the concentration of odour compounds in a sample is known as ChlorinationFlushingSettlingStripping Answer: Stripping

Q. The water temperature should preferably be less than __ degree Celsius 10152530 Answer: 25

Q. Monitoring systems can be carried out by using __________ MotorsAutomatic sensorsAutomatic motorsTurbines Answer: Automatic motors

Q. ____________ comes under the chemical monitoring of the lake. DetergentsPathogensTurbidityConductivity Answer: Detergents

Q. Pollution enters into the water system in ___________ ways. 4321 Answer: 4