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Test: Quality & Characteristics of Sewage - 1


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10 Questions MCQ Test GATE Civil Engineering (CE) 2023 Mock Test Series | Test: Quality & Characteristics of Sewage - 1

Test: Quality & Characteristics of Sewage - 1 for Civil Engineering (CE) 2022 is part of GATE Civil Engineering (CE) 2023 Mock Test Series preparation. The Test: Quality & Characteristics of Sewage - 1 questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Quality & Characteristics of Sewage - 1 MCQs are made for Civil Engineering (CE) 2022 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Quality & Characteristics of Sewage - 1 below.
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Test: Quality & Characteristics of Sewage - 1 - Question 1

The specific gravity of sewage is

Test: Quality & Characteristics of Sewage - 1 - Question 2

Pickup the incorrect statement

Test: Quality & Characteristics of Sewage - 1 - Question 3

Gases, which are generally evolved during aerobic decomposition of sewage, are:

Detailed Solution for Test: Quality & Characteristics of Sewage - 1 - Question 3

Test: Quality & Characteristics of Sewage - 1 - Question 4

Imhoff cone is used to measure, in sewage:

Detailed Solution for Test: Quality & Characteristics of Sewage - 1 - Question 4

The quantity of settleable solids (Ss) can be determined easily with the help of a specially designed conical glass vessel called Imhoff cone. The capacity of the cone is 1 litre, and it is graduated up to about 50 ml.

Test: Quality & Characteristics of Sewage - 1 - Question 5

The pH of fresh sewage is usually

Detailed Solution for Test: Quality & Characteristics of Sewage - 1 - Question 5

Fresh sewage is generally alkaline in nature (with pH more than 7); but as time passes, its pH tends to fall due to production of acids by bacterial action in anaerobic or nitrification processes. The pH however, rises upon treatment of sewage.

Test: Quality & Characteristics of Sewage - 1 - Question 6

pH = 3, when compared to pH = 5, will be more acidic by

Detailed Solution for Test: Quality & Characteristics of Sewage - 1 - Question 6

pH = -log H+
⇒ pH = 3
⇒ H+ = 10-3
⇒ pH = 3
⇒ H+ = 10-5

= 102 times more acidic

Test: Quality & Characteristics of Sewage - 1 - Question 7

Chemical oxygen Demand (COD) of sewage is the

Detailed Solution for Test: Quality & Characteristics of Sewage - 1 - Question 7

COD is the oxygen required to oxidise the total organic matter present in waste water. COD is determined by oxidising a known quantity of waste water with known quantity of strong oxidising agent like K2Cr2O7 or KMnO4. BOD gives only the total biologically active organic matter present in the sewage.

Test: Quality & Characteristics of Sewage - 1 - Question 8

Minimum D.O. prescribed for a river stream, to avoid fish kills, is

Detailed Solution for Test: Quality & Characteristics of Sewage - 1 - Question 8

To ensure 4 ppm of D.O. in sewage to be disposed in river D.O. content is determined by Winkler’s method

Test: Quality & Characteristics of Sewage - 1 - Question 9

BOD5 represents 5 days-biochemical oxygen demand at a temperature of

Test: Quality & Characteristics of Sewage - 1 - Question 10

Standard 5 day BOD at 20°C, when compared to ultimate BOD, is about

Detailed Solution for Test: Quality & Characteristics of Sewage - 1 - Question 10

The BOD of water during 5 days at 20° generally taken as the standard demand, and is about 68% of the total demand. A 10 day BOD is about 90% of the total.

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