Correct answer
C. 5 day BOD is less than 4 day BOD keeping other conditions same
Explanation
The correct answer is 5 day BOD is less than 4 day BOD keeping other conditions same.
Select the correct relationship between porosity (N), specific yield (y) and specific retention (R)________?
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________?
If the water content of a fully saturated soil mass is 100%, then the voids ratio of the sample is________?
The drainage area of a town is 12 hectares. Its 40% area is hard pavement ( K = 0.85), the 40% area is unpaved streets (K = 0.20) and the remaining is wooded areas (K = 0.15). Assuming the time of concentration for the areas as 30 minutes and using the formula Ps = 900/(t + 60) the maximum run off is________?
The ratio of the thickness of web to that of flange of steel rolled structural beams and channels is________?
The rainfall at any place may be determined by________?