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State PCS PYQPrelims 2021

UPPCS · प्रश्न 43

'World Ozone Day' is celebrated on:

  1. 25th December
  2. 21st April
  3. 16th September
  4. 30th January
उत्तर देखें और व्याख्या

उत्तर: (C) 16th September

व्याख्या

16 September marks the signing of the Montreal Protocol (1987).