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  3. 9th Class
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9th Class Science Sample Paper Science Olympiad Model Test Paper-12

  • question_answer
    Which one of the following subatomic particles has mass equal to that of a hydrogen atom and carrying one unit positive charge?

    A) Electron

    B) Proton

    C) Neutron

    D) All of these

    E) None of these

    Correct Answer: B

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