Answer
(a) Strong
(b) Weak
(c) Strong
(d) Weak
(e) Weak
(f) Weak
(g) Strong
(h) Weak
(i) Weak
Work Step by Step
There are only a few strong acids:
$HI, HBr, HClO_4, HCl, HClO_3, H_2SO_4$ and $HNO_3$.
This can only be determined experimentally, therefore, there is no rule; you will need to know each of them.
Any acid that doesn't belong to this list is a weak acid.