Water Supply and Sanitary

41) De-chlorination of water is achieved by adding

Discuss in Comment

sodium thiosulphate

42) If present in water, chlorination of water does not reduce the

Discuss in Comment

dissolved oxygen content

43) The efficiency of a sedimentation tank does not depend upon

Discuss in Comment

depth of the tank

44) Sewage sickness relates to

Discuss in Comment

clogging of pores in soil due to excessive application of sewage to land, obstructing aeration and leading to septic conditions

45) For the combined sewerage system, egg-shaped sewers are preferred because

Discuss in Comment

they offer good flow velocity during

46) Traps are used in household drainage systems to

Discuss in Comment

prevent entry of foul gases in the house

47) Area method of land filling is most suitable when

Discuss in Comment

adequate depth of cover material is available at the site

48) In transition of sewers from smaller diameter sewers to larger diameter sewers, the continuity of sewers is maintained at the

Discuss in Comment

crowns of the sewers

49) Which one of the following would contain water with the maximum amount of turbidity?

Discuss in Comment

rivers

50) The waste stabilization ponds can be

Discuss in Comment

any of the above

Subject Notes

Objective Box

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