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PSC Civil Engg: Environmental Quiz 10
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Question 1
The waste water of a certain large colony contains 10–5.6 mmol/l of OH– ions at 25 ºC.
The pH of this sample is
The pH of this sample is
Question 2
A sewer has a diameter of 300 mm and slope of 1 in 400. While running full it has a mean velocity of 0.7 m/s. if both the diameter and slope are doubled (to respectively be 600 mm and 1 in 200), what well be the changed mean velocity when running half-full? Use Manning’s formula.
Question 3
10 MLD water is to be chlorinated in a clear water reservoir (CWR) with 0.8 mg/l chlorine dose with providing contact time of 40 minutes. The required CWR capacity is nearly
Question 4
The concentration of chloride ions in a water sample is estimated by titration with
Question 5
What is the equivalent calcium carbonate concentration of 110 mg/L of CaCl2?
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May 17ESE & GATE CE
