Upto about 50 km from the surface of earth the atmosphere consists of approximately

  1. 78% oxygen and 21% nitrogen
  2. 21% oxygen and 78% nitrogen
  3. 68% oxygen and 32% nitrogen
  4. 33% oxygen and 66% oxygen

Previous Post
Next Post

Related Posts

    Categories

    Tags

    Contact us

    Privacy Policy


    PakMCQs.PK Copyright 2024 

    Become a Member