7. What is the special \'\'smart\'\' property that a zinc coating on steel has?

Question

7. What is the special ''smart'' property that a zinc coating on steel has? a. becomes thicker over time b. is self - healing if scratched c. becomes thinner over time d. doesn't change color over time 8. Thermosetting plastics are not good for recycling because they cannot be softened for reprocessing. T (true) F (false) 9. What does ''organic'' refer to in the SPI definition of plastics? a. it has oxygen in it b. it has carbon in it c. it is made organically 10. Glass that was rapidly cooled while in the plastic state to place the surface in compression and the core in tension is a. Annealed glass b. Tempered glass c. Soft glass d. Chemically toughened glass 11. Most often the structure of which of the following materials s amorphous? a. Diamond b. Cement c. Ceramic d. Glass

Explanation / Answer

7. The special "smart" property of Zn coating on steel is,

a. becomes thicker over time

8. Thermosetting plastics cannot be recycled because they cannot be softened for reprocessing,

T(True)

9. The meaning of organic in SPI is,

a. It has oxygen in it.

10. Glass that was rapidly cooled is,

b. Tempered glass

11. The structure of the follwoig is mostly amorphous,

d. glass

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