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GATE CE 2022: Environmental Engineering Quiz #3

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Question 1

The safe water does not contain any:

Question 2

A 250 ml water sample initially has a pH of 10. 25 ml of 0.02 N is required to reduce the pH of the sample to 4.5. The total alkalinity of water as in mg/l is (nearest integer)

Question 3

Arrange the following water quality parameters in the increasing order of allowable quantity in treated water.

1) Suspended solids

2) Sodium

3) Alkalinity

4) Iron

Question 4

Match the class of the type of disease causing organisms in the first column with the dieses caused in second column.

P. Bacteria - 1) Amoebic dysentery

Q. Virus - 2) Cholera

R. Protozoa - 3) Echinococcosis

S. Helminth - 4) Polio

Question 5

Consider the following statements:

1) Excess of sodium metal in drinking water supply may cause cardiac and kidney problem.

2) Excess of copper metal in drinking water supply may affect respiratory organs of human body.

3) During water supply temperature should be maintained between 20-35°C otherwise chemical and biological parameters of water may get affected.

Which of the following statements are correct?

Question 6

A mixture is formed by mixing the following two solutions:
Solution P : Volume = 400 ml; pH = 6
Solution Q : Volume = 600 ml; pH = 4
The pOH of mixture (correct to two decimal places) is
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