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1
JEE Main 2019 (Online) 12th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Water samples with BOD values of 4 ppm and 18 ppm, respectively are :
A
Clean and Highly polluted
B
Highly polluted and Clean
C
Highly polluted and Highly polluted
D
Clean and Clean
2
JEE Main 2019 (Online) 11th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Taj Mahal is being slowly disfigured and discoloured. This is primarily due to :
A
acid rain
B
soil pollution
C
global warming
D
water pollution
3
JEE Main 2019 (Online) 11th January Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The higher concentration of which gas in air can cause stiffness of flower buds?
A
CO2
B
SO2
C
NO2
D
CO
4
JEE Main 2019 (Online) 11th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Peroxyacetyl nitrate (PAN), an eye irritant is produced by :
A
classical smog
B
acid rain
C
photochemical smog
D
organic waste

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