Water Supply and Sanitary

251) For health, presence of traces of the following elements is a must in drinking water

Discuss in Comment

fluorides and iodine

252) Besides Ca and Mg, the other metallic ions responsible for hardness are

Discuss in Comment

Fe and Mn

253) An advantage of COD test over BOD test is

Discuss in Comment

it is relatively a quick process

254) BOD test is not well suited to industrial wastes because

Discuss in Comment

toxic chemicals produce wrong results

255) BOD represents

Discuss in Comment

pollutional strength of bio-degradable organic fraction of wastes

256) The effluent of a biological treatment unit should have a BOD less than

Discuss in Comment

30 mg/l

257) BOD test is standardised at

Discuss in Comment

20°C and 5 day

258) For any waste

Discuss in Comment

COD is always greater than BOD

259) Time taken for COD test is about

Discuss in Comment

3 hrs

260) Result of COD is generally higher than that of BOD because

Discuss in Comment

the strong oxidising conditions in the test

Subject Notes

→ Hydraulics → Structural Design-RCC → Irrigation Engineering → Highway Engineering → Engineering Survey → Water supply & sanitary → Soil Mechanics → Mechanics and structure → Construction Management → Building Construction → Estimating and Costing → Engineering Drawing → Building Material → Airport Engineering

Objective Box

→ Airport Engineering → Building Construction → Construction Management → Construction Materials → Engineering Drawing → Engineering Survey → Estimating and Costing → Highway Engineering → Fluid & Hydraulics → Soil Mechanics → Structural Design - RCC → Water Supply and Sanitary → Irrigation Engineering → Mechanics and Structure → Civil MCQ Set 1 → Civil MCQ Set 2 → Civil MCQ Set 3 → Civil MCQ Set 4

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