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1
JEE Main 2022 (Online) 24th June Evening Shift
MCQ (Single Correct Answer)
+4
-1
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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
2
JEE Main 2021 (Online) 1st September Evening Shift
MCQ (Single Correct Answer)
+4
-1
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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
3
JEE Main 2021 (Online) 31st August Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The deposition of X and Y on ground surfaces is referred as wet and dry depositions, respectively. X and Y are :
A
X = Ammonium salts, Y = CO2
B
X = SO2, Y = Ammonium salts
C
X = Ammonium salts, Y = SO2
D
X = CO2, Y = SO2
4
JEE Main 2021 (Online) 31st August Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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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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