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Quality Control of Water

Environmental Engineering

Previous Years Questions

Marks 1

The hardness of a ground water sample was found to be 420 mg/L as $$CaCO_3$$. A softener containing ion exchange resins ...
GATE CE 2016 Set 2
A groundwater sample was found to contain 500 mg/L total dissolved solids (TDS). TDS (in %) present in the sample is ___...
GATE CE 2015 Set 2
Some of the nontoxic metals normally found in natural water are
GATE CE 2014 Set 1
The alkalinity and the hardness of a water sample are 250 mg/L and 350 mg/L as $$CaCo_3$$, respectively. The water has
GATE CE 2007
The presence of hardness in excess of permissible limit causes
GATE CE 2007
1 TCU is equivalent to color produced by
GATE CE 2005
Most of the turbidity meters work on the scattering principle. The turbidity value obtained is expressed in
GATE CE 2004
In natural water, hardness is mainly caused by
GATE CE 2002
Temporary hardness in water is caused by the presence of
GATE CE 1999
The microbial quality of treated piped water supplies is monitored by
GATE CE 1998
MPN index is measure of one of the following:
GATE CE 1997
Alkalinity of water can be defined correctly in one of the following ways
GATE CE 1997

Marks 2

The analysis of a water sample produces the following results: The total hardness (in mg/L as $${\mathrm{CaCO}}_3$$) of...
GATE CE 2017 Set 2
A sample of water has been analyzed for common ions and results are presented in the form of a bar diagram as shown. Th...
GATE CE 2016 Set 2
Effluent from an industry 'A' has a pH of 4.2. The effluent from another industry 'B' has double the hydroxyl (OH-) ion ...
GATE CE 2016 Set 1
For a sample of water with the ionic composition shown in the figure below, the carbonate and noncarbonate hardness conc...
GATE CE 2014 Set 1
A water sample has a pH of 9.25. The concentration of hydroxyl ions in the water sample is
GATE CE 2012
Ion concentrations obtained for a groundwater sample (having pH=8.1) are given below. .tg {border-collapse:collapse;bo...
GATE CE 2010
Ion concentrations obtained for a groundwater sample (having pH=8.1) are given below. .tg {border-collapse:collapse;bo...
GATE CE 2010
A wastewater sample contains $$10^{-5.6}$$ mol/l of OH- ions at $$25^o$$ C. The pH of this sample is
GATE CE 2008
If tomato juice is having a pH of 4.1, the hydrogen ion concentration will be
GATE CE 2005
Two Samples of Water A and B have pH values of a 4.4 and 6.4 respectively. How many times more acidic sample A is than s...
GATE CE 2000

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Class 12