Q. Which Material is used for smart film?

Correct Answer: c) Indium tin oxide

Explanation:
“Smart film” (switchable privacy film) typically uses a PDLC (polymer-dispersed liquid crystal) layer sandwiched between two PET layers that are coated with a transparent conductive material. Indium tin oxide (ITO) is the standard transparent conductor used for these films. It allows an electric field to be applied across the PDLC, switching the film between opaque and transparent states while remaining optically clear.

The other options (zinc chloride, calcium carbonate, silica) are not transparent conductive materials and are not used as the electrode layer in smart films.