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  3. 2nd Class
  4. Social Science

2nd Class Social Science Sample Paper Social Studies - Sample Test Paper-5

  • question_answer
    Air is a mixture of gases. The main gas present in air is:

    A) Oxygen

    B)        Nitrogen

    C) Hydrogen                      

    D) Carbon-di-oxide

    E) None of these

    Correct Answer: B

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