Physics - Error Question with Solution | TestHub

Absolute error ($\Delta x$) has the same dimensions as the measured quantity (x). Relative error ($\Delta x/x$) is a ratio of two quantities with the same dimensions, hence it is dimensionless. Percentage error is ($\Delta x/x\times 100\%$) and is also dimensionless. Least count is the smallest value an instrument can measure, so it has the same dimensions as the measured quantity.