NextMockपरीक्षा शोधा, उदा. SSC CGL, UPPSC, Lekhpal
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 दाखवा आणि स्पष्टीकरण

उत्तर: (C) 16th September

स्पष्टीकरण

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