Waste water Engineering Mock test – 4 || Civil Engineering Mock tests




Welcome to your Waste water Engineering Mock test - 4
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You have only 20 mins to complete the test (25 Questions)
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1. In primary sedimentation, the 0.2 mm inorganic solids get separated if specific gravity is
2. The small sewers are cleaned by
3. Aerobic activity is maximum
4. The sewage discharge in a detritus tank of a treatment plant is 576 litres/sec with flow velocity of  0.2 m/sec. If the ratio of width to depth is 2, the depth is
5. Rate of flow of sewage is generally assumed
6. Drop manholes at the junctions of sewer lines, are provided if
7. The sewerage system originates from
8. To test chemical oxygen demand (C.O.D.) of sewage, organic matter is oxidised by potassium dichromate in the presence of
9. Sewer pipes need be checked for
10. In sewage, the solids in mg per litre is
11. hydraulically equivalent, the relationship which holds good, is
12. The ratio of minimum hourly flow to the average flow of sewage is
13. In olden days the type of section adopted in trunk and out fall sewers was
14. Fresh sewage may become stale in
15. In 1000 kg of sewage, the total solids approximate
16. House connections to the laterals is generally made by
17. If a paper moistened with lead acetate for five minutes when placed in manhole turns black. The sewer certainly contains
18. For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed
19. Removal of oil and grease from sewage, is known
20. In septic tanks, decomposition of organic bacteria, is done by
21. The standard B.O.D. of water is taken for
22. The coagulant widely used for sewage treatment, is
23. In R.C. sewer pipes, the percentage longitudinal reinforcement to the cross-sectional area of  concrete is kept
24. If the diameter of a sewer is 100 mm, the gradient required for generating self cleansing velocity is
25. The sewer which transports the sewage to the point of treatment, is called







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