Question $(1)$:

a$-$ In a Density Measurement experiment the diameter of the cylinder and its length are measured using the instrument shown below. The values shown by

Diameter

Length $=(,)$

i$)$ The name of the instrument used is $q,$

ii$)$ Find the density of the cylinder in $\frac{g}{c}{m}^3$ if its mass is $13\mathrm{.}5$ g $?$