Question 167General Subjects - QMED

The correct answer is A) 40 threads per inch. A micrometer screw has a pitch of 40 threads per inch, which means the distance between each adjacent thread is 1/40th of an inch. This is a standard pitch for a micrometer screw, as it provides a high level of precision for measurement. The other options are incorrect because they do not match the typical pitch of a micrometer screw. 50, 75, and 100 threads per inch would result in finer and more detailed measurements, which are not the standard for a typical micrometer used in Coast Guard examinations.