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MCQs 1: The means of access for inspection and cleaning of sewer line is known as_______________?

inlet manhole drop manhole catch basin
Answer Explanation

MCQs 2: Dissolved oxygen in streams is______________?

maximum at noon minimum at noon maximum at midnight same throughout the day
Answer Explanation

MCQs 3: The minimum dissolved oxygen which should always be present in water in order to save the aquatic life is______________?

1 ppm 4 ppm 10 ppm 40 ppm
Answer Explanation

MCQs 4: The ratio of 5 day BOD to ultimate BOD is about_______________?

1/3 2/3 3/4 1.0
Answer Explanation

MCQs 5: The correct relation between theoretical oxygen demand (TOD), Biochemical oxygen demand (BOD) and Chemical oxygen demand (COD) is given by_______________?

TOD>BOD>COD TOD>COD>BOD BOD>COD>TOD COD>BOD>TOD
Answer Explanation

MCQs 6: Settling velocity increases with_______________?

specific gravity of solid particles size of particles depth of tank temperature of liquid
Answer Explanation

MCQs 7: Which of the following retards the self purification of stream ?

higher temperature sunlight satisfying oxygen demand none of the above
Answer Explanation

MCQs 8: The characteristics of fresh and septic sewage respectively are____________________?

acidic and alkaline alkaline and acidic both acidic both alkaline
Answer Explanation

MCQs 9: The most commonly used sewer under culverts is_______________?

circular brick sewer circular cast iron sewer semi-elliptical sewer horse-shoe type sewer
Answer Explanation

MCQs 10: An egg shaped section of sewer________________?

is economical than circular section provides self cleansing velocity at low discharges is more stable than circular section is easy to construct
Answer Explanation

MCQs 11: The main disadvantage of cement concrete sewers is________________?

less strength difficulty in construction difficulty in transportation due to heavy weight less life
Answer Explanation

MCQs 12: The design discharge for the combined sewer system shall be taken as________________?

equal to rainfall rainfall + DWF rainfall + 2 DWF rainfall + 6 DWF
Answer Explanation

MCQs 13: The slope of sewer shall be__________________?

given in the direction of natural slope of ground given in the direction opposite to natural slope of ground zero steeper than 1 in 20
Answer Explanation

MCQs 14: The specific gravity of sewage is_______________?

much greater than 1 slightly less than 1 equal to 1 slightly greater than 1
Answer Explanation

MCQs 15: If the time of concentration is 9 minutes, then the intensity of rainfall according to British Ministry of Health formula will be__________________?

4 mm/hr 10mm/hr 20 mm/hr 40 mm/hr
Answer Explanation

MCQs 16: The suitable system of sanitation for area of distributed rainfall throughout the year with less intensity is_________________?

separate system combined system partially separate system partially combined system
Answer Explanation

MCQs 17: Sewerage system is usually designed for_________________?

10 years 25 years 50 years 75 years
Answer Explanation

MCQs 18: The hydraulic mean depth (HMD. for an egg-shaped sewer flowing two-third full is_______________?

equal to HMD when flowing full less than HMD when flowing full greater than HMD when flowing full none of the above
Answer Explanation

MCQs 19: 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_________________?

1000 4000 100000 400000
Answer Explanation

MCQs 20: For a country like India, where rainfall is mainly confined to one season, the suitable sewerage system will be________________?

separate system combined system partially combined system partially separate system
Answer Explanation

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