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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2008

  • question_answer
    If \[{{\log }_{10}}7=0.8451,\]then the position of the first significant figure of \[{{7}^{-20}}\]is

    A)  \[16\]                                  

    B)  \[17\]

    C)  \[20\]                                  

    D)  \[15\]

    Correct Answer: B

    Solution :

    Let \[x={{7}^{-20}}\] \[{{\log }_{10}}x=-20\,{{\log }_{10}}7\]                 \[=-20(0.8451)\]                 \[=-16.902\] Hence, the first significant figure is 17.


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