1) Which of the following is low cost onsite sewage disposal systems a) Composting pit b) chemical toilets c) Septic tank d) All of them 2) The water obtained after removal of sludge and floating solids is called a) Clear water b) clarified water c) Sewage Water d) both a and b 3) To treat water from impurities ----------- are added to dirty water . a) Water tablets  b) Chlorine tablets c) clear water bubble d) None of them 4) Identify the process of sewage disposal by using worms given below a) vermicomposting b) vermicast c) humus d) both a&c 5) Dust,grit and pebbles deposit in this huge tank is called a) grit chamber b) sedimentation tank c) clarifier d) None of them 6) A network of big and smaller pipes connected to dispose waste water from houses is known as  a) Sewerage  b) sludge c) sump d) Sewers 7) The condition arises due to accumulation of excess nitrogen in water is known as a) Trade water b) Agricultural water  c) Eutrophication d) Sludge 8) The type of bacteria that helps in decomposing organic matter in water is a) Anaerobic bacteria b) Aerobic bacteria c) myco bacteria d) fungus 9) Polythene bags ,sticks and cans are removed from the sedimentation tank using a) Filters b) Vertical bar screens c) sedimentation process d) Grit chamber 10) what is the organic waste that is acted upon by bacteria called ? a) Vegetables b) Oil c) Sludge d) Fruits

WASTE MANAGEMENT

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