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NEET Physics Mathematical Tools, Units & Dimensions NEET PYQ-Mathematical Tools, Units and Dimensions

  • question_answer
    A student measured the diameter of a small steel ball using a screw gauge of least count 0.001 cm. The main scale reading is 5 mm and zero of circular scale division coincides with 25 divisions above the reference level. If screw gauge has a zero error of -0.004 cm, the correct diameter of the ball is                                 [NEET - 2018]

    A) 0.053 cm

    B) 0.525 cm

    C) 0.521 cm

    D) 0.529 cm

    Correct Answer: D

    Solution :

    [d] Diameter of the ball
    \[\text{=MSR+CSR }\!\!\times\!\!\text{ (Least count)--Zero error}\]
    \[\text{=0}\text{.5 cm+25 }\!\!\times\!\!\text{ 0}\text{.001--(--0}\text{.004)}\]
    \[=0.5+0.025+0.004\]
    \[\text{=0}\text{.529 cm}\]


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