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 mm 50 The value of x is : 

(1) 142

(2) 71

(3) 42

(4) 21                                                          JEE-2024

Solution:                
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 mm 50 The value of x is : (1) 142 (2) 71 (3) 42 (4) 21 JEE-2024

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