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2- Crystallinity in plastics create a-higher transparency b-lower strength and lower density c-lower density and lower transparency d-higher strength and higher density 3- Ductility is measured by a-The yield strain b-The ultimate strain c% elongation at fracture d-The area under the stress strain curve 4- What is the approximate cooling rate required for a eutectoid carbon steel to transform completely into martensite? Assume the initial temperature is 800 a-at least 35 degrees C/s b-at least 10 degrees C/s c-at lease 140 Degrees C/s d-the eutectoid steel cannot form martinsite