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9th Class Science Sample Paper Science Olympiad Model Test Paper-20

  • question_answer
    What is the number of water molecules contained in a drop of water weighing 0.09 g?

    A) \[4.72\times {{10}^{21}}\]

    B) \[2.021\times {{10}^{20}}\]

    C) \[3.011\times {{10}^{21}}\]

    D) \[3.001\times {{10}^{23}}\]

    E) None of these

    Correct Answer: C

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