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

(True or False):-

1. True

2. True

3. False

4. True

5. True

MCQ :-

1. (b) Purified natural quartz