COMPUTER BASIC INFORMATION QUIZ

At every summit of rising mains

At street corners to control the flow of water

At every depression and dead ends to drain out the waste water that may collect there

At the foot of rising main along the slope to prevent back running of water

100 ppm

400 ppm

300 ppm

200 ppm

6.5 to 8.0

10.5 to 12.0

8.5 to 10.0

4.5 to 6.0

Horseshoe type sewer

Semi-elliptical sewer

Egg shaped sewer

Circular sewer

Only (iii)

(i) and (iii)

Only (i)

(i) and (ii)

Algae only

Dual action of aerobic bacteria and anaerobic bacteria

Sedimentation

Aerobic bacteria only

Less than HMD when flowing full

Greater than HMD when flowing full

None of these

Equal to HMD when flowing full

Lime

Sulphuric acid

Copper sulphate

Sodium permanganate

0.5 to 1.0 ppm

0.01 to 0.05 ppm

1.0 to 5.0 ppm

0.05 to 0.5 ppm

2 × DWF

3 × DWF

Equal to dry weather flow (DWF)

6 × DWF