The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found
to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to
high concentration of :
02Easy92×since 2004Q1082
A water sample has ppm level concentration of the following metals : Fe = 0.2; Mn = 5.0; Cu = 3.0; Zn = 5.0. The metal that makes the water sample unsuitable for drinking is :
03Easy92×since 2004Q1083
Which of the following conditions in drinking water causes methemoglobinemia?
04Easy92×since 2004Q1084
Water filled in two glasses A and B have BOD values of 10 and 20, respectively. The correct statement regarding them, is :
05Easy92×since 2004Q1085
The concentration of dissolved oxygen (DO) in cold water can go upto :
06Easy92×since 2004Q1086
Water samples with BOD values of 4 ppm and 18 ppm, respectively are :
07Easy92×since 2004Q1087
The maximum prescribed concentration of
copper in drinking water is :
08Easy92×since 2004Q1088
Biochemical Oxygen Demand (BOD) is the
amount of oxygen required (in ppm) :
09Easy92×since 2004Q1089
The presence of soluble fluoride ion upto
1 ppm concentration in drinking water, is :
10Medium92×since 2004Q1090
Given below are two statements :
Statement I : The value of the parameter "Biochemical Oxygen Demand (BOD)" is important for survival of aquatic life.
Statement II : The optimum value of BOD is 6.5 ppm.
In the light of the above statements, choose the most appropriate answer from the options given below :