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1
JEE Main 2020 (Online) 5th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The condition that indicates a polluted environment is :
A
BOD value of 5 ppm
B
eutrophication
C
0.03% of CO2 in the atmosphere
D
pH of rain water to be 5.6
2
JEE Main 2020 (Online) 4th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The processes of calcination and roasting in metallurgical industries, respectively, can Iead to :
A
Global warming and photochemical smog
B
Photochemical smog and ozone layer depletion
C
Photochemical smog and global warming
D
Global warming and acid rain
3
JEE Main 2020 (Online) 3rd September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The incorrect statement(s) among (a) – (d) regarding acid rain is (are) :

(a) It can corrode water pipes.
(b) It can damage structures made up of stone.
(c) It cannot cause respiratory ailments in animals.
(d) It is not harmful for trees
A
(c) and (d)
B
(a), (b) and (d)
C
(c) only
D
(a), (c) and (d)
4
JEE Main 2020 (Online) 3rd September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
Thermal power plants can lead to :
A
Ozone layer depletion
B
Blue baby syndrome
C
Eutrophication
D
Acid rain
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