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1
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
2
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
3
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
4
JEE Main 2021 (Online) 17th March Morning Shift
MCQ (Single Correct Answer)
+4
-1
Reducing smog is a mixture of :
A
Smoke, fog and O3
B
Smoke, fog and N2O3
C
Smoke, fog and CH2 = CH $$-$$ CHO
D
Smoke, fog and SO2
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