This chapter is currently out of syllabus
1
JEE Main 2019 (Online) 9th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The layer of atmosphere between 10 km to 50 km above the sea level is called as :
A
mesosphere
B
thermosphere
C
troposphere
D
stratosphere
2
JEE Main 2019 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Excessive release of CO2 into the atomosphere results in :
A
depletion of ozone
B
polar vortex
C
global warming
D
formation of smog
3
JEE Main 2019 (Online) 8th April Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
The maximum prescribed concentration of copper in drinking water is :
A
3 ppm
B
5 ppm
C
0.5 ppm
D
0.05 ppm
4
JEE Main 2019 (Online) 8th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Assertion : Ozone is destroyed by CFCs in the upper stratosphere.

Reason : Ozone holes increase the amount of UV radiation the earth.
A
Assertion and reason are both correct, and the reason is the correct explanation for the assertion.
B
Assertion and reason are incorrect.
C
Assertion and reason are correct but, the reason is not the explanation for the assertion
D
Assertion is false, but the reason is correct.
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