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
Answers
Answer:
Animal fibers are natural fibers that consist largely of certain proteins. Examples include silk, hair/fur (including wool) and feathers. The animal fibers used most commonly both in the manufacturing world as well as by the hand spinners are wool from domestic sheep and silk. Also very popular are alpaca fiber and mohair from Angora goats. Unusual fibers such as Angora wool from rabbits and Chiengora from dogs also exist, but are rarely used for mass production.
Not all animal fibers have the same properties, and even within a species the fiber is not consistent. Merino is a very soft, fine wool, while Cotswold is coarser, and yet both Merino and Cotswold are types of sheep. This comparison can be continued on the microscopic level, comparing the diameter and structure of the fiber. With animal fibers, and natural fibers in general, the individual fibers look different, whereas all synthetic fibers look the same. This provides an easy way to differentiate between natural and synthetic fibers under a microscope.
Explanation:
Materials. A glass optical fiber is a flexible, transparent fiber made by drawing glass. It consists of a core surrounded by a cladding layer.
Answer:
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