Use of decimals in measures of lengths

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

Which one of the following intruments is not used for the measurement of length?

Which is the correct way to measure length using a ruler ?

Find the greatest possible length of the rope which can be used to measure two sticks of lengths 24 m and 18 m.

A steel tape is correctly calibrated at 20^(@)C and is used to measure the length of a table at 30^(@)C . Find the percentage error in the measurement of length. [alpha_(steel) = 11 xx 10^(-5)//.^(@)C]

A steel tape is correctly calibrated at 20^(@)C and is used to measure the length of a table at 30^(@)C . Find the percentage error in the measurement of length. [alpha_(steel) = 11 xx 10^(-5)//.^(@)C]