Question

III. Tick (✓) the correct and cross (X) the wrong statement:
1. Animal textiles are commonly made from hair or fur
2. There are numerous polymers inside the human body
3. Potassic fertilisers should be added in the later stages of plant growth.
4. Soaps form insoluble scum of calcium and magnesium ions with hard water.
5. Glass fibres cannot be used in the production of spacesuits.
MCQ
1. optical fibre are made from
(a) fine sand
(b) purified natural quartz
(c) dry ice and sand
(d) polyethene​

Answer 1

Correct

Incorrect

Incorrect

Correct

Incorrect

purified natural quarts

Answer 2

Answer:

1) true

2)true

3)false

4)_

5)true

Explanation:

optical fiber is a flexible, transparent fiber made by drawing glass. It consists of a core surrounded by a cladding layer. ... Since the diameter of thin glass fibers is about a half of the typical human hair, fiber cores are made from very high purity optical glass materials.

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