Chapter 13 to 18 - National Council Of Educational ...

1 MULTIPLE CHOICE of the following is waste water?(a)Water trickling from a damaged tap.(b)Water coming out of a shower.(c)Water flowing in a river.(d)Water coming out of a is mainly a(a)liquid waste.(b)solid waste.(c)gaseous waste.(d)mixture of solid and of the following is/are products of wastewatertreatment?(a)Biogas(b)Sludge(c )Both biogas and sludge(d) drain system is a breeding place for which of thefollowing.(a)Flies(b)Mosquitoes(c)Org anisms which cause diseases(d)All of polluted by various human activities causes a numberof water borne diseases. Which of the following is not a waterborne disease?(a)Cholera(b)Typhoid(c)Asthma(d) Dysentry18 Wastewater Story12/04/201894 EXEMPLAR from the following one chemical used to disinfect water.(a)Chlorine(b)Washing soda(c)Silica(d) system of a network of pipes used for taking awaywastewater from homes or public buildings to the treatmentplant is known as(a)sewers.(b)sewerage.

2 (c)transport system.(d)treatment of the following is a part of inorganic impurities of thesewage?(a)Pesticides(b)Urea(c)Phospha tes(d)Vegetable a filtration plant water is filtered using layers of(a)sand and clay.(b)clay and fine gravel.(c)sand and fine gravel.(d)sand, fine gravel and medium of the following is not a source of waste water?(a)Sewers(b)Homes(c)Industries(d)H ospitalsVERY SHORT ANSWER are open drains a concern? whether the following statements are True or False. Incase a statement is false, write the correct statement.(a)Sewage is a solid waste which causes water pollutionand soil (b)Used water is wastewater.(c)Wastewater could be reused.(d)Where underground sewerage systems and refusedisposal systems are not available, the high cost on-sitesanitation system can be are open drains harmful for human health?SHORT ANSWER two inorganic impurities present in waste, oil and urea are some of the organic impuritiespresent in sewage.

3 Name two more organic impurities presentin two alternative arrangements for sewage disposal wherethere is no sewerage man travelling in a train threw an empty packet of food onthe platfrom. Do you think this is a proper waste disposalmethod? should we not throw(a)used tea leaves into sink?(b)cooking oil and fats down the drain? the items of Column I with the items of Column II withreference to STORY12/04/201896 EXEMPLAR below is a jumbled sequence of the processes involved ina wastewater treatment plant. Arrange them in their correctsequence.(a)Sludge is scraped out and skimmer removes the floatinggrease.(b)Water is made to settle in a large tank with a slope in themiddle.(c)Large objects like plastic bags are removed by passingwastewater through bar screens.(d)Sand, grit and pebbles are made to settle by decreasingthe speed of incoming wastewater.(e)Wastewater enters a grit and sand removal statements are provided here which define the terms (a) sludge (b) sewage and (c) wastewater.

4 Pick out the correctdefinition for each of these terms.(a)The settled solids that are removed in wastewatertreatment with a scraper.(b)Water from kitchen used for washing dishes.(c)Wastewater released from homes, industries, hospitalsand other public mixture (x) in water contains suspended solids, organicimpurities, inorganic impurities (a), nutrients (b), diseasecausing bacteria and other microbes. Give names for (x), (a)and (b)?LONG ANSWER are the different types of inorganic and organic impuritiesgenerally present in sewage? terms sewage, sewers and sewerage are interlinked witheach other. Can you explain, how?12/04/201897 WASTEWATER in the blanks in the following statements using words givenin the , handpumps, cholera, water, large, groundA very _____ number of our people defecate in the open. Itmay cause _____ pollution and soil pollution. Both thesurface water and _____ water get polluted. _____ wateris the source for wells, tubewells and _____.

5 Thus itbecomes the most common route for _____ borne diseaseslike _____, dysentery, various steps of cleaning wastewater in a wastewatertreatment and suggest some ways to minimise waste and pollutantsat their source, taking your home as an