- (A) at street corners to control the flow of water
- (B) at every depression and dead ends to drain out the waste water that may collect there
- (C) at the foot of rising main along the slope to prevent back running of water
- (D) at every summit of rising mains
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- (A) presence of oxygen only
- (B) absence of oxygen only
- (C) presence as well as in absence of oxygen
- (D) presence of water
- (A) 1
- (B) 100
- (C) infinite
- (D) zero
- (A) 100 ppm
- (B) 200 ppm
- (C) 300 ppm
- (D) 400 ppm
- (A) directly proportional to BOD satisfied
- (B) directly proportional to BOD remain-ing
- (C) inversely proportional to BO
- (D) satisfied
- (A) 20°C – 1day
- (B) 25°C- 3day
- (C) 20°C – 5day
- (D) 30°C- 5day
- (A) 5-10 years
- (B) 15-20 years
- (C) 30-40 years
- (D) 40-50 years
- (A) nitrification
- (B) chlorination
- (C) oxidation
- (D) none of the above
- (A) circular sewer
- (B) egg shaped sewer
- (C) horse-shoe type sewer
- (D) semi-elliptical sewer
- (A) to decrease it
- (B) to increase it
- (C) fluctuating
- (D) nil
