2. Questions Bank
  3. 8th Class
  4. Science
  5. Pollution of Air and Water

8th Class Science Pollution of Air and Water Question Bank Pollution of Air and Water

  • question_answer
    Gas present in air in about 78% by volume is:

    A) Oxygen            

    B) Nitrogen

    C) Carbon dioxide

    D)        Argon

    E) None of these

    Correct Answer: B

You need to login to perform this action.
You will be redirected in 3 sec spinner