Step 1: Plaster of Paris Properties.
Plaster of Paris exhibits rapid hardening upon contact with water. This characteristic facilitates its application in quick repairs, molding, and casting processes.
Step 2: Evaluation of Alternatives.
- (1) Water-resistant: This is inaccurate, as set Plaster of Paris lacks water resistance.
- (2) Rapid setting with water: This is accurate, representing its key utility in swift repair tasks.
- (3) Transparent: This is inaccurate; Plaster of Paris is opaque.
- (4) Flexible: This is inaccurate, as Plaster of Paris solidifies into a hard, brittle state.
Step 3: Determination.
Consequently, option (2) "Quick setting when mixed with water" is identified as the correct choice.