GATE CE
Environmental Engineering
Quality Control of Water
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 was installed to reduce the to...
A groundwater sample was found to contain 500 mg/L total dissolved solids (TDS). TDS (in %) present in the sample is ________.
Some of the nontoxic metals normally found in natural water are
The presence of hardness in excess of permissible limit causes
The alkalinity and the hardness of a water sample are 250 mg/L and 350 mg/L as $$CaCo_3$$, respectively. The water has
1 TCU is equivalent to color produced by
Most of the turbidity meters work on the scattering principle. The turbidity value obtained is expressed in
In natural water, hardness is mainly caused by
Temporary hardness in water is caused by the presence of
The microbial quality of treated piped water supplies is monitored by
Alkalinity of water can be defined correctly in one of the following ways
MPN index is measure of one of the following:

## Marks 2

The analysis of a water sample produces the following results: The total hardness (in mg/L as $${\mathrm{CaCO}}_3$$) of the water sample is ______....
A sample of water has been analyzed for common ions and results are presented in the form of a bar diagram as shown. The non-carbonate hardness (expr...
Effluent from an industry 'A' has a pH of 4.2. The effluent from another industry 'B' has double the hydroxyl (OH-) ion concentration than the effluen...
For a sample of water with the ionic composition shown in the figure below, the carbonate and noncarbonate hardness concentrations (in mg/l as $${\mat... A water sample has a pH of 9.25. The concentration of hydroxyl ions in the water sample is Ion concentrations obtained for a groundwater sample (having pH=8.1) are given below. .tg {border-collapse:collapse;border-spacing:0;display:inline-... Ion concentrations obtained for a groundwater sample (having pH=8.1) are given below. .tg {border-collapse:collapse;border-spacing:0;overflow:auto;d... A wastewater sample contains$$10^{-5.6}$$mol/l of OH- ions at$$25^o C. The pH of this sample is
If tomato juice is having a pH of 4.1, the hydrogen ion concentration will be
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 sample B
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