| I. Plastic was invented in 1960 |
| II. They are the products of polymer chemistry produced from the by- products of petroleum refining |
| III. They are characterized into thermoplastics and thermosetting plastic |
A) I & II
B) II & III
C) Only III
D) All the above
Correct Answer: D
Solution :
Plastics have become an indispensable part of our daily lives. Invented in 1935, they are wonderful products of polymer chemistry produced from the by- products of petroleum refining. They are classified as into two main categories
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