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1
JEE Main 2021 (Online) 25th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Given below are two statements :

Statement I : Chlorofluoro breakdown by radiation in the visible energy region and release chlorine gas in the atmosphere which then reacts with stratospheric ozone.

Statement II : Atmospheric ozone reacts with nitric oxide to give nitrogen and oxygen gases, which add to the atmosphere.

For the above statements choose the correct answer from the options given below :
A
Statement I is incorrect but Statement II is true
B
Both Statement I and II are false
C
Statement I is correct but Statement II is false
D
Both Statement I and II are correct
2
JEE Main 2021 (Online) 20th July Evening Shift
MCQ (Single Correct Answer)
+4
-1
Which one of the following gases is reported to retard photosynthesis?
A
CO
B
CFCs
C
CO2
D
NO2
3
JEE Main 2021 (Online) 18th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
The statements that are TRUE :

(A) Methane leads to both global warming and photochemical smog

(B) Methane is generated from paddy fields

(C) Methane is a stronger global warming gas than CO2

(D) Methane is a part of reducing smog

Choose the most appropriate answer from the options given below :
A
(A), (B), (C) only
B
(A) and (B) only
C
(B), (C), (D) only
D
(A), (B), (D) only
4
JEE Main 2021 (Online) 17th March Evening Shift
MCQ (Single Correct Answer)
+4
-1
Which of the following statement(s) is (are) incorrect reason for eutrophication?

(A) excess usage of fertilisers

(B) excess usage of detergents

(C) dense plant population in water bodies

(D) lack of nutrients in water bodies that prevent plant growth

Choose the most appropriate answer from the options given below :
A
(A) Only
B
(B) and (D) only
C
(C) only
D
(D) only
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