Civil Engineering MCQs

Page No. 176

Laying of sewers is usually done with the help of________________?


aa theodolite

✖


ba compass

✖


csight rails and boning rods

✓


da plane table

✖



Sewerage system is designed for_______________?


amaximum flow only

✖


bminimum flow only

✖


caverage flow only

✖


dmaximum and minimum flow

✓



Facultative bacteria are able to work in________________?


apresence of oxygen only

✖


babsence of oxygen only

✖


cpresence as well as in absence of oxygen

✓


dpresence of water

✖



The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is______________?The relative stability of a sewage sample, whose dissolved oxygen is same as the total oxygen required to satisfy BOD, is______________?


a 1

✖


b100

✓


cinfinite

✖


dzero

✖


View Answer 100

In a BOD test, 1.0 ml of raw sewage was diluted to 100 ml and the dissolved oxygen concentration of diluted sample at the beginning was 6 ppm and it was 4 ppm at the end of 5 day incubation at 20°C. The BOD of raw sewage will be___________?


a100 ppm

✖


b200 ppm

✓


c300 ppm

✖


d400 ppm

✖


View Answer 200 ppm

The rate of BOD exerted at any time is_____________?


a directly proportional to BOD satisfied

✖


bdirectly proportional to BOD remain-ing

✓


cinversely proportional to BOD satisfied

✖


d inversely proportional to BOD re-maining

✖



Standard BOD is measured at________________?


a20°C – 1day

✖


b 25°C- 3day

✖


c 20°C – 5day

✓


d30°C- 5day

✖


View Answer 20°C – 5day

Sewage treatment units are normally designed for______________?


a5-10 years

✖


b15-20 years

✓


c 30-40 years

✖


d40-50 years

✖


View Answer 15-20 years

The pathogens can be killed by_______________?


anitrification

✖


bchlorination

✓


coxidation

✖


dnone of the above

✖


View Answer chlorination

The type of sewer which is suitable for both combined and separate system is_____________?


acircular sewer

✖


begg shaped sewer

✓


chorse-shoe type sewer

✖


dsemi-elliptical sewer

✖


View Answer egg shaped sewer

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