CFCs
CFCs is a Environment concept from the MPSC syllabus, tested in 2 past MPSC questions (2014, 2023). Below are those real questions with their correct answers and explanations, plus the concepts worth being comfortable with first.
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ओझोन संदर्भात खालील कोणती विधाने बरोबर आहेत ? In relation to Ozone which statements are true ?
(a)अ. ओझोनला पृथ्वीचे रक्षण कवच म्हणतात. / A. Ozone is called protection shield of the Earth.
(b)ब. 1985 मध्ये ओझोन थराला छिद्र पडल्याचे स्पष्ट झाले. / B. In 1985 it was clear that Ozone layer has holes.
(c)क. 16 सप्टेंबर हा जागतिक ओझोन दिवस म्हणून साजरा केला जातो. / C. 16th September is celebrated as World Ozone Day.
(d)ड. 1989 मध्ये ओझोन क्षयास कारणीभूत रसायन वापरावर बंदी घालण्यात आली. / D. In 1989 chemicals responsible for Ozone depletion are banned to utilize.
All the given statements are correct: Ozone is the earth's protective shield, the ozone hole was discovered in 1985, World Ozone Day is September 16, and the Montreal Protocol (1989) restricted ozone-depleting substances.
कोणत्या वायूमुळे मुख्यत्वे ओझोन थराचा हास होतो ? / The main gas responsible for ozone depletion is :
Chlorofluorocarbons (CFCs) release chlorine atoms upon UV exposure, which actively break down ozone molecules in the stratosphere, causing depletion.