1
JEE Main 2022 (Online) 25th June Morning Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

The eutrophication of water body results in :

A
loss of Biodiversity.
B
breakdown of organic matter.
C
increase in biodiversity.
D
decrease in BOD.
2
JEE Main 2022 (Online) 24th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
Change Language

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
3
JEE Main 2021 (Online) 1st September Evening Shift
MCQ (Single Correct Answer)
+4
-1
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
4
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
BOD values (in ppm) for clean water (A) and polluted water (B) are expected respectively :
A
A > 50, B < 27
B
A > 25, B < 17
C
A < 5, B > 17
D
A > 15, B > 47
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