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7th Class Science Physical and Chemical Changes Question Bank Physical and Chemical Changes

  • question_answer
    When an iron bar of length 12 cm is magnetized, its length was found to have increased. What happens to its mass?

    A)  It increases.

    B)  It decreases.

    C)  It remains the same.

    D)  It cannot be explained.

    Correct Answer: C

    Solution :

    Magnetization makes the molecules in the iron bar regroup themselves in an orderly alignment. It does not involve any increase in mass.


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