JEE Main & Advanced Chemistry Some Basic Concepts of Chemistry Question Bank Significant figures Units for measurement

  • question_answer Given \[P=0.0030m\], \[Q=2.40m\], \[R=3000m\], Significant figures in \[P,\,Q\] and \[R\] are respectively           [Pb. CET 2002]

    A)                 2, 2, 1    

    B)                 2, 3, 4

    C)                 4, 2, 1    

    D)                 4, 2, 3

    Correct Answer: B

    Solution :

                    Given\[P=0.0030m\], \[Q=2.40m\] & \[R=3000m\] in \[P(0.0030)\] initial zeros after the decimal point are not significant. Therefore, significant figures in \[P(0.0030)\] are 2. Similarly in \[Q(2.40)\] significant figures are 3 as in this case final zero is significant. In \[R=(3000)\] all the zeroes are significant hence, in \[R\] significant figures are 4.


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