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A screw gauge gives the following reading when used to measure the diameter of a wire. Main scale reading: 0 mm Circular scale reading: 52 divisions Given that 1 mm on main scale corresponds to 100 divisions of the circular scale. The diameter of wire from the above data is
- 0.052 cm
- 0.026 cm
- 0.005 cm
- 0.52 cm
Correct answer: 0.052 cm
Solution
The diameter of the wire is calculated by combining the main scale reading and the circular scale reading. The main scale reading is 0 mm, and the circular scale reading of 52 divisions corresponds to 0.52 mm (since 1 mm equals 100 divisions, 52 divisions equal 0.52 mm). Converting this to centimeters gives 0.052 cm.
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