Question

Which of the following measurements is least percise,and how many significant digits does it have?50.25cm,12.5cm,101cm

Answer 1

101 cm is the least precise. This is because there are no decimals, while the other two have decimals. There are 3 sig figs.

Answer 2

50.25 cm = Four significant digits

12.5 cm= Three significant digits

101 cm = Three significant digits

Measuring , 50.25 is least precise , because measuring decimal upto two places accurately, requires Instruments other than Ruler , that is Screwgauge , which makes work more difficult.

While other two measurement, 12.5 cm and 101 cm can be measured with the help of ruler.