Question : Ultra violet radiations of the Sun do not reach the earth because, earth's atmosphere is surrounded by:
Option 1: Carbon dioxide
Option 2: Ammonia
Option 3: Chlorine
Option 4: Ozone
Correct Answer: Ozone
Solution : The correct answer is ozone.
Ozone layer present in stratosphere protects the earth from the harmful ultraviolet radiations of the sun. It majorly absorbs the UV b and UV c radiations which is the most severe. Although it is transparent to UV A radiations. Its thickness is measured in Dobson Units. Ozone present in stratosphere is good ozone, while the ozone present in the troposphere is a pollutant. Chlorine, chlorofluorocarbons etc. are ozone depleting substance.
Related Questions
Know More about
Staff Selection Commission Combined Grad ...
Result | Eligibility | Application | Selection Process | Preparation Tips | Admit Card | Answer Key
Get Updates Brochure
Your Staff Selection Commission Combined Graduate Level Exam brochure has been successfully mailed to your registered email id “”.
Upcoming Exams
Trending Articles around SSC CGL
