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Envt- Quality Parameters- Quiz (App update required to attempt this test)

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Question 1

The measured pH values of incoming and outgoing water at a water treatment plant are 7.3 and 8.5 respectively. What is the average pH of water, assuming linear variation of pH with time?

Question 2

A 25 ml sample was diluted to 250 ml with odourless distilled water so that the odour of the sample no longer perceivable. What was the Threshold odour number?

Question 3

On which scale the turbidity is measured?

Question 4

Results of a water sample analysis are as follows.

Hardness of the water sample in mg/L as CaCO₃ is

Question 5

Nitrates more than 45 mg/l in water lead to disease called :

Question 6

Which of the following do not represent direct health threat?

Question 7

Jackson’s turbidimeter is used when turbidity is

Question 8

Re-oxygenation curve of a polluted stream

Question 9

The hardness of a ground water sample was found to be

A softener containing ion exchange resins was installed to reduce the total hardness to 75 mg/L as

before supplying to 4 households. Each household gets treated water at a rate of 540 L/day. If the efficiency of the softener is 100%, the bypass flow rate (expressed in L/day) is _____________.

Question 10

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?

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ESE & GATE CE Environmental Engineering

Feb 2ESE & GATE CE