Air-Composition and Structure-II
There are 5 Multiple Choice based Questions below. You are required to enter your Name, Section and Roll number at the beginning and then go for attempting the questions. All the questions are designed to enhance your knowledge so try to attempt them sincerely.  
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Enter your Name, Section, and Roll no. *
1. Ozone layer protect us from the ________________ of the Sun. *
1 point
2. The atmosphere extends to over _____ Kms above the surface of the Earth. *
1 point
3. _________________ is the lowest layer of the atmosphere. *
1 point
4. The total mass of the air surrounding our planet is called _________________. *
1 point
5. The two main gases in our atmosphere are: *
1 point
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