28) A micrometer has a negative error of 0.03 mm. What is the correct reading when the micrometer measures 40.53 mm ?

29) Zero error of a 50-75 mm outside micrometer can be checked with

30) The value of the smallest division on sleeve of a metric outside micrometer is

31) The value of one division on bevel edge of the thimble of a metric outside micrometer is

32) If the zero graduation of the thimble division of an outside micrometer is below the datum line, when the measuring faces of the micrometer are in contact, the error is