While measuring diameter of wire using screw gauge the following readings were noted. Main scale reading is 1 mm and circular scale reading

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🧑‍🏫 Author: Aditya Bhatt Sir   |   🕒 Last Updated: July 13, 2025

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📘Question

While measuring diameter of wire using screw gauge the following readings were noted. Main scale reading is 1 mm and circular scale reading is equal to 42 divisions. Pitch of screw gauge is 1 mm and it has 100 divisions on circular scale. The diameter of the wire is x/50 mm . The value of x is :
(1) 142           (2) 71
(3) 42             (4) 21                              (JEE-2024)  

✅ Answer

Ans. (2) 

While measuring diameter of wire using screw gauge the following readings were noted. Main scale reading is 1 mm and circular scale reading is equal to 42 divisions. Pitch of screw gauge is 1 mm and it has 100 divisions on circular scale. The diameter of the wire is x/50 mm . The value of x is : (1) 142            (2) 71 (3) 42               (4) 21

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