(a) State one danger associated with each of the following practices:
(i)Leaving a gap between the work rest and the wheel of an off hand grinder;
(ii)Pouring molten metal without using leather apron;
(iii)Using bare hand to clear swarf;
(iv)Drilling a piece of material which is being held by the hand.

(b) (i) State two properties of copper

(ii)List three uses of copper.