(a(i))[2]
On Fig. 4.1, indicate and label: 1 the external diameter $d$ of the beaker, 2 the internal depth $h$ of the beaker, 3 the thickness $t$ of the glass.
(a(ii))[2]
Use measurements taken from Fig. 4.1 to determine $d$, $h$ and $t$. State your answers to the nearest millimetre.
(a(iii))[2]
An approximate value of the volume $V$ of the glass used in the beaker is given by $V = \pi d t \left(h + \frac{d}{4}\right)$. Using the values from a(ii), calculate $V$. Show your working and give your answer to 2 significant figures.
(b)[1]
Suggest appropriate instruments for measuring $t$ and $h$ accurately on a real beaker.