GENERAL KNOWLEDGE

Detailed explanation-1: -The least count of an instrument is the smallest measurement that can be taken accurately with it. For example, if an ammeter has 5 divisions between the marks 0 and 1A, then its least count is 1/5 = 0.2 A or it can measure current up to the value 0.2 accurately.

Detailed explanation-2: -Hint: Least Count of an instrument is the smallest change or value of a physical parameter an instrument can measure or detect. So, the screw gauge has minimum least count.

Detailed explanation-3: -The “least count” of an instrument is the smallest division that is marked on the scale. This is the smallest quantity that can be read directly without estimating fractions of a division. Even at the limit of an instrument’s precision, however, accidental errors-which cannot be eliminated-still occur.

Detailed explanation-4: -Least count of a measuring instrument is the smallest measurement that can be made accurately with the given measuring instrument. A metre scale normally has graduations at 1 mm (or 0.1 cm) spacing, as the smallest division on its scale.