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

  • question_answer In the final answer of the expression \[\frac{(29.2-20.2)\,(1.79\times {{10}^{5}})}{1.37}\]. The number of significant figures is                     [CBSE PMT 1994]

    A)                 1             

    B)                 2

    C)                 3             

    D)                 4

    Correct Answer: B

    Solution :

               \[\frac{(29.2-20.2)\ (1.79\times {{10}^{5}})}{1.37}\]\[=\frac{9.0\times 1.79\times {{10}^{5}}}{1.37}\]                 Least precise terms i.e., 9.0 has only two significant figures. Hence, final answer will have two significant figures.

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