Question Detail
Question
What is the correct reading from a micrometer screw gauge where the main scale reads 5.5 mm and the thimble scale aligns with the 28th division (least count 0.01 mm)?
Correct Answer
Option B is the correct answer.
Detailed Explanation
The total reading for a micrometer is the main scale reading plus the thimble scale reading. Here, the main scale reading is 5.5 mm. The thimble scale reading is 28 divisions × 0.01 mm/division = 0.28 mm. Adding them gives 5.5 mm + 0.28 mm = 5.78 mm.
Hint
Multiply the thimble division by the least count and add it to the main scale reading.