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

How many significant digits are there in 0.008?

How many significant digits are there in 0.06900?

How many significant digits are there in 7521.05890 ?

The Richter scale measure

A metal scale is graduated at 0^@C . What would be the true length of an object which when measured with this scale at 25^@C , reads 50 cm? alpha for metal = 18 xx 10^(-6)//^@C .

Metre scales are madeup of alloy:

What is the reliability of measurement of length using a metre scale ?