JEE Main 2020 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 9 January 2020, Shift 2, Chemistry Q38

Question 38 of 75 in this shift, Chemistry question 13 of 25, Section A.

Biochemical Oxygen Demand (BOD) is the amount of oxygen required (in ppm) :

(1)for sustaining life in a water body.
(2)for the photochemical breakdown of waste present in 1 m $^3$ volume of a water body.
(3)by bacteria to break-down organic waste in a certain volume of a water sample.Official answer
(4)by anaerobic bacteria to breakdown inorganic waste present in a water body.

Official answer

Option 3

NTA final key (Jan 2020).

Chapter: Environmental Chemistry
Topic: Environmental Chemistry
Idea tested: Water Quality BOD and COD

Same idea in other shifts

Asked 5× in all

11 Apr 2023, Shift 1 · Q71Given below are two statements: Statement I: If BOD is 4 ppm and dissolved oxygen is 8 ppm, then it is a good quality water. Statement II:…MediumTwo statements
25 Jun 2022, Shift 2 · Q72Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R. Assertion A: Polluted water may have…MediumAssertion–reason
26 Jun 2022, Shift 2 · Q70The measured BOD values for four different water samples (A-D) are as follows: A = 3 ppm; B=18 ppm; C=21 ppm; D=4 ppm. The water samples…EasySingle correct
24 Feb 2021, Shift 2 · Q41Given below are two statements : $\textbf{Statement I :}$ The value of the parameter “Biochemical Oxygen Demand (BOD)” is important for…EasyTwo statements

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.