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Environmental engineering
1-Dont try to cram or spend more time here just read it fast and cover syllabus then practice MCQ's cheptor of same topic to check your progress. . |
2-Wrong options are also given but dont concentrate there, Right answer is in bold format. |
Q41 ⇒ Methane is Odourless [other wrong options] [Discuss in forum] Heavier than air Soluble in water All of these |
Q42 ⇒ The most commonly used sewer under culverts is circular brick sewer [other wrong options] [Discuss in forum] circular cast iron sewer semi-elliptical sewer horse-shoe type sewer |
Q43 ⇒ The type of sewer which is suitable for both combined and separate system is egg shaped sewer [other wrong options] [Discuss in forum] circular sewer horse-shoe type sewer semi-elliptical sewer |
Q44 ⇒ The characteristics of fresh and septic sewage respectively are alkaline and acidic [other wrong options] [Discuss in forum] acidic and alkaline both acidic both alkaline |
Q45 ⇒ The pathogens can be killed by chlorination [other wrong options] [Discuss in forum] nitrification oxidation none of the above |
Q46 ⇒ Which of the following retards the self purification of stream ? none of the above [other wrong options] [Discuss in forum] higher temperature sunlight satisfying oxygen demand |
Q47 ⇒ Sewage treatment units are normally designed for 15-20 years [other wrong options] [Discuss in forum] 5-10 years 30-40 years 40-50 years |
Q48 ⇒ Settling velocity increases with depth of tank [other wrong options] [Discuss in forum] specific gravity of solid particles size of particles temperature of liquid |
Q49 ⇒ Standard BOD is measured at 20°C - 5day [other wrong options] [Discuss in forum] 20°C - 1day 25°C- 3day 30°C- 5day |
Q50 ⇒ Select the correct statement. 5 day BOD is less than 4 day BOD keeping other conditions same. [other wrong options] [Discuss in forum] 5 day BOD is the ultimate BOD. 5 day BOD is greater than 4 day BOD keeping other conditions same. BOD does nof depend on time. |
Q51 ⇒ If Biochemical oxygen demand (BOD) of a town is 20000 kg/day and BOD per capita per day is 0.05 kg, then population equivalent of town is 400000 [other wrong options] [Discuss in forum] 1000 4000 100000 |
Q52 ⇒ The rate of BOD exerted at any time is directly proportional to BOD remain-ing , [other wrong options] [Discuss in forum] directly proportional to BOD satisfied inversely proportional to BOD satisfied inversely proportional to BOD re-maining |
Q53 ⇒ The ratio of 5 day BOD to ultimate BOD is about 2/3 [other wrong options] [Discuss in forum] 1/3 3/4 1.0 |
Q54 ⇒ The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is 4 ppm [other wrong options] [Discuss in forum] 1 ppm 10 ppm 40 ppm |
Q55 ⇒ The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is 100 [other wrong options] [Discuss in forum] 1 infinite zero |
Q56 ⇒ Dissolved oxygen in streams is maximum at noon [other wrong options] [Discuss in forum] minimum at noon maximum at midnight same throughout the day |
Q57 ⇒ Facultative bacteria are able to work in presence as well as in absence of oxygen [other wrong options] [Discuss in forum] presence of oxygen only absence of oxygen only presence of water |
Q58 ⇒ The means of access for inspection and cleaning of sewer line is known as manhole [other wrong options] [Discuss in forum] inlet drop manhole catch basin |
Q59 ⇒ Sewerage system is designed for maximum and minimum flow [other wrong options] [Discuss in forum] maximum flow only minimum flow only average flow only |
Q60 ⇒ Sewage treatment units are designed for average flow only [other wrong options] [Discuss in forum] maximum flow only minimum flow only maximum and minimum flow |
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