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Envt- Sewage Treatment-1-quiz (App update required to attempt this test)

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Question 1

Match list-I with list-II and select the correct answer using the codes given below the lists:

Question 2

Consider the following statements:

a. Presence of nitrogen in a waste sample is due to the decomposition of proteins and carbohydrates.

b. When BOD/COD =0, waste water is toxic.

Which of the above statements are correct?

Question 3

Which of the following statement in relation to peaking factor for wastewater flow rates is correct

Question 4

Design parameters for rapid mixing units are

Question 5

A rectangular tank 18 m x 8 m x 4m of water depth treats 4 million litres of water per day. The detention time for tank will be ____hours.

Question 6

Which of the following chemical parameters are associated with the organic content of water?

1) Biological Oxygen Demand (BOD)

2) Chemical Oxygen Demand (COD)

3) Total Organic Carbon (TOC) and Total Oxygen Demand (TOD)

Question 7

Statement (I): Digestion of sludge is not required when secondary treatment of sewage is done in oxidation ditches.

Statement (II): Oxidation ditch admits an extended aeration process.

Question 8

A combined sewerage system is more appropriate for developed areas where

Question 9

In extended aeration process, the system works in which phase?

Question 10

Connecting pipe in mm for septic tank should not be less than:

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Feb 1ESE & GATE CE