Question

1. Optical fibers are made from
(a) fine sand
(b) purified natural quartz
(c) dry ice and sand
(d) polyethene

2. PVC is a
(a) thermoplastic (b) thermosetting plastic
(c) plastic
(d) all of the above​

Answer 1

Answer:

1. An optical fiber is a flexible, transparent fiber made by drawing glass (silica) or plastic to a diameter slightly thicker than that of a human hair.
2. thermoplastic