Environmental Engineering Cleaning is done by (i) Scraping and removal in filters slow sand (ii) Back washing in slow sand filters (iii) Scraping and removal in filters rapid sand (iv) Back washing in rapid sand filters The correct answer is (i) and (iv) (ii) and (iii) (i) and (ii) (ii) and (iv) (i) and (iv) (ii) and (iii) (i) and (ii) (ii) and (iv) ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering Composting and lagooning are the methods of Filtration Sedimentation Sludge disposal Sludge digestion Filtration Sedimentation Sludge disposal Sludge digestion ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering Ground water is usually free from Dissolved impurities Suspended impurities Both suspended and dissolved impurities None of these Dissolved impurities Suspended impurities Both suspended and dissolved impurities None of these ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering Activated carbon is used for Removing hardness Removing odours Disinfection Removing corrosiveness Removing hardness Removing odours Disinfection Removing corrosiveness ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is 1 100 Infinite Zero 1 100 Infinite Zero ANSWER DOWNLOAD EXAMIANS APP
Environmental Engineering Facultative bacteria are able to work in Presence as well as in absence of oxygen Presence of water Absence of oxygen only Presence of oxygen only Presence as well as in absence of oxygen Presence of water Absence of oxygen only Presence of oxygen only ANSWER DOWNLOAD EXAMIANS APP
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