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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)
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-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
3
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
4
JEE Main 2019 (Online) 11th January Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The concentration of dissolved oxygen (DO) in cold water can go upto :
A
14 ppm
B
16 ppm
C
8 ppm
D
10 ppm
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