This chapter is currently out of syllabus
1
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)
2
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
3
JEE Main 2020 (Online) 2nd September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The statement that is not true about ozone is :
A
In the stratosphere, CFCs release chlorine free radicals (Cl) which reacts with O3 to give chlorine dioxide radicals
B
It is a toxic gas and its reaction with NO gives NO2.
C
In the atmosphere, it is depleted by CFCs
D
In the stratosphere, it forms a protective shield against UV radiation
4
JEE Main 2020 (Online) 9th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Biochemical Oxygen Demand (BOD) is the amount of oxygen required (in ppm) :
A
for sustaining life in a water body.
B
by anaerobic bacteria to breakdown inorganic waste present in a water body.
C
for the photochemical breakdown of waste present in 1 m3 volume of a water body.
D
by bacteria to break-down organic waste in a certain volume of a water sample.
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