2. Sample Papers
  3. 9th Class
  4. Science

9th Class Science Sample Paper Science Olympiad Model Test Paper-4

  • question_answer
    The number of neutron in an atom having atomic number 11 and mass number 23 is:

    A) 11

    B) 10

    C) 13

    D) 12

    E) None of these

    Correct Answer: D

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