The main ingredient in dental plaster in_______________? A. Calcium sulphate hemihydrate B. Calcium phosphate C. Calcium anhydrate D. Calcium sulphate dihydrate

Die is________________? A. Impression of single tooth B. Impression of whole teethC. Replica of single tooth D. Replica of whole teeth

Plaster of paris is mixed in________________? A. Plastic bowlB. Rubber bowl C. Glass bowl D. Metal bowl

Water of reaction needed to react completely with 100 g of calcium sulphate hemihydrates to convert it to calcium sulphate dihydrate______________? A. 18.6ml B. 22.2ml C. 30.4ml D. 45.3ml

Green strength with reference to plaster means_____________? A. Dry strength B. Compressive strength C. Strength of dental stone due to green colourD. The wet strength

Water powder ratio of dental stone and plaster is respectively_________________? A. 0.28 and 0.6 B. 0.6 and 0.28 C. 0.6 and 3.2 D. 0.28 and 0.98

Model plaster (white) used to cast study models before mixing with water, is largely composed of____________? A. CaO B. CaCO3C. (CaSO4)2-½H2O D. CaSO4-2H2O