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JEE Main & Advanced AIEEE Solved Paper-2008

  • question_answer
    Two full turns of the circular scale of a screw gauge cover a distance of 1 mm on its main scale. The total number of divisions on circular scale is 50. Further, it is found that screw gauge has a zero error of - 0.03mm. While measuring the diameter of a thin wire, a student notes the main scale reading of 3mm and the number of circular scale divisions in line with the main scale as 35. The diameter of wire is       AIEEE  Solved  Paper-2007

    A) 3.67 mm

    B) 3.38 mm              

    C) 3.32 mm              

    D) 3.73 mm

    Correct Answer: B

    Solution :

    Least count \[=\frac{0.5\,mm}{50}=0.01mm\] Zero error = ? 0.03 mm Measured diameter = 3 mm + 35 \[\times \]  0.01 mm = 3.35 mm Corrected diameter = 3.35 mm ? (? 0.03mm) = 3.38 mm


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