Question

if you measure a 5cm line with a ruler that is marked off in 0.1 cms, how many digits should the measurement have?

Answer 1

3 digits .

Step-by-step explanation:

The least count of the ruler that is being used is 0.1 cm , hence it can measure upto one decimal point of cm . One more decimal point can be inferred .

So the measurement of 5 cm will look like

5 .00 cm or it will have 3 significant figure . The last figure of the measurement suffers from error as it has been inferred or guessed.