A metre scale is graduated at every millimetre. How many significant digits can be present in a length measurement made with this scale?

Step-by-step solution

The least count of a metre scale graduated at every millimetre is 1 mm. The measurements made with this scale can range from 1 mm to 1000 mm. If the measured length is between 1 mm and 9 mm, the number of significant digits is 1 . If the measured length is between 10 mm and 99 mm, the number of significant digits is 2 . If the measured length is between 100 mm and 999 mm, the number of significant digits is 3 . If the measured length is exactly 1000 mm (or 1.000 m), the number of significant digits is 4 . Thus, the