NextMockપરીક્ષાઓ શોધો, દા.ત. SSC CGL, UPPSC, Lekhpal
State PCS PYQPrelims 2021

UPPCS · પ્રશ્ન 43

'World Ozone Day' is celebrated on:

  1. 25th December
  2. 21st April
  3. 16th September
  4. 30th January
જવાબ બતાવો અને સમજૂતી

જવાબ: (C) 16th September

સમજૂતી

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