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