California RDA Written Practice Exam 2025 – Full Prep Guide

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The water/powder ratio of plaster for pouring a model is

100/30

100/40

100/50

The water/powder ratio of plaster for pouring a model is important because it affects the consistency and setting time of the plaster. A ratio that is too high, like A or B, will create a thinner mixture which can lead to weaker and more fragile casts. Similarly, a ratio that is too low, like D, will create a thicker mixture that may take longer to set and can result in a rougher surface texture on the cast. A 100/50 ratio, as in option C, is generally considered the standard for pouring a model. This creates a creamy mixture that pours easily and produces a smooth and strong cast.

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100/60

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