71st B.P.S.C. (Pre) 2025
Which material is used for smart film?
aIndium tin oxide✓ Correct
bCalcium carbonate
cZinc chloride
dSilica
Explanation
Smart film or switchable smart film is generally a PDLC (Polymer Dispersed Liquid Crystal) film. For the transparent conductive layer of smart film, indium tin oxide (ITO)-coated PET or glass is commonly used. Calcium carbonate (CaCO3) is mainly used in cement, lime making, and as a filler; zinc chloride (ZnCl2) is used in chemical reactions, dry cells, flux, etc.; and silica (SiO2) is used as a structural material for ordinary glass, etc.
general-science