$1.$The lenght between each graduation on the ruler at your lab bench is$?$

a$)10$cm

b$)1$cm

c$)0\mathrm{.}1$cm

d$)0\mathrm{.}01$cm

$2.$When using the ruler to make a measuremnt, the estimated digit is:$?$

a$)$tense place $10$cm

b$)$once place $1$cm

c$)$tenth place $0\mathrm{.}1$cm

d$)$hundreths place $0\mathrm{.}01$cm