2. Sample Papers
  3. 6th Class
  4. Science

6th Class Science Sample Paper Science Olympiad Model Test Paper-3

  • question_answer
    Nitrogen and oxygen together constitutes about ______of air by volume.

    A) 78%     

    B) 21%

    C) 99%

    D) 1%

    E) None of these

    Correct Answer: C

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