NCERT Class 8 Science Chapter 3 Synthetic Fibres and Plastics Solutions
NCERT Class 8 Science Chapter 3 Synthetic Fibres and Plastics Solutions NCERT TEXT BOOK EXERCISES Q. 1. Explain why some fibres are called synthetic. Ans. Some fibres are called synthetic because they do not occur naturally and are made by man using petrochemicals. Q. 2. Mark (✓) the correct answer: Rayon is different from synthetic fibre because: (i) it has a silk like appearance. (ii) it is obtained from wood pulp. (iii) its fibres can also be woven like those of natural fibres. Ans. (ii) it is obtained from wood pulp. Q. 3. Fill in the blank with appropriate words: (i) Synthetic fibres are also called _________ or __________ fibres. Ans. man-made or artifical fibres. (ii) Synthetic fibres are synthesized from raw material called __________. Ans. petrochemicals. (iii) Like synthetic fibres, plastic is also a __________. Ans. polymer. Q. 4. Give examples which indicate that nylon fibres are very strong. Ans. Examples: (i) They are used for making parachutes and ropes ...