JEE Main & Advanced Physics Mathematical Tools, Units & Dimensions JEE PYQ - Mathematical Tools Units and Dimensions

  • question_answer
    If the screw on a screw-gauge is given six rotations, it moves by 3 mm on the main scale. If there are 50 divisions on the circular scale the least count of the screw gauge is: [JEE MAIN Held on 09-01-2020 Morning]

    A) 0.01 cm

    B) 0.001 mm

    C) 0.001 cm

    D) 0.02 mm

    Correct Answer: C

    Solution :

    [c] Pitch \[=\frac{3mm}{6}=0.5mm\]
                \[\Rightarrow L.C.=\frac{0.5}{50}mm\]
                \[=\frac{1}{100}mm\]
                \[={{10}^{-3}}cm\]


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