Mixed ConceptsEasyQuestion 5047
Question
A micrometer screw gauge has pitch 1 mm and 100 circular divisions. What is its least count in metres?
- A10⁻³ m
- B10⁻⁴ m
- C10⁻⁵ mCorrect
- D10⁻⁶ m
Correct answer
10⁻⁵ m
Explanation
Least count = 1 mm / 100 = 0.01 mm. Since 1 mm = 10⁻³ m, this is 10⁻⁵ m. Resolution alone does not establish measurement accuracy.