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Which of the following is the most precise instrument for measuring length?

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Which of the following is the most precise instrument for measuring length?
A. Meter rod of least count `0.1 cm`
B. Vernier callipers of least count `0.01 cm`
C. Screw gauge of least count `0.001 cm`
D. Data is not sufficient to decide
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Correct Answer - C
Screw gauge has minimum least count of `0.001 cm`, hence , it is the most precise intrument .
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