NEET Physics Screw Gauge MCQ Question
A screw gauge has a pitch of 1 mm and 100 divisions on its circular scale. If the linear scale reading is 5 mm and the circular scale reading is 25 divisions, what is the measured diameter of the object in mm?
5.25
5.50
6.00
5.75
Correct Answer
Detailed Explanation
The least count of the screw gauge is calculated as pitch divided by number of divisions on the circular scale, which is 0.01 mm. The measured diameter is given by the formula: M + n × L.C., where M = 5 mm, n = 25, and L.C. = 0.01 mm. Thus, the diameter is 5 + (25 × 0.01) = 5.25 mm.
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