Correct answer
D. any duration
Explanation
The correct answer is any duration.
For the COD test of sewage, organic matter is oxidised by K2Cr2O7 in the presence of________?
The effect of increasing diameter of sewer on the self cleansing velocity is________?
In the quadrantal bearing system, a whole circle bearing of 293° 30′ can be expressed as________?
The minimum depth of foundation in clayey soils is________?
The aggregates required for one kilometer length of water bound macadam road per meter width and for 10 mm thickness is________?
In a cavity wall, both leaves of which are load bearing, the effective thickness is taken as________?