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1
JEE Main 2022 (Online) 25th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R.

Assertion A : Polluted water may have a value of BOD of the order of 17 ppm.

Reason R : BOD is a measure of oxygen required to oxidise both the bio-degradable an non-biodegradable organic material in water.

In the light of the above statements, choose the most appropriate answer from the options given below.

A
Both A and R are correct and R is the correct explanation of A.
B
Both A and R are correct but R is NOT the correct explanation of A.
C
A is correct but R is not correct.
D
A is not correct but R is correct.
2
JEE Main 2022 (Online) 25th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The eutrophication of water body results in :

A
loss of Biodiversity.
B
breakdown of organic matter.
C
increase in biodiversity.
D
decrease in BOD.
3
JEE Main 2022 (Online) 24th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not cause it.

A
CH4
B
O3
C
H2O
D
N2
4
JEE Main 2021 (Online) 1st September Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Water sample is called cleanest on the basis of which one of the BOD values given below :
A
11 ppm
B
15 ppm
C
3 ppm
D
21 ppm
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