(C) PVC pipe Answer: (c) Like synthetic fibres, plastic is also a ………… We must not throw plastic in the water bodies or on the roads. It was prepared from coal, water and air. (c) polymer , The arrangement of units in a plastic can be linear or cross-linked. Question 2. Rayon is obtained by the chemical treatment of wood pulp or cellulose. C. bakelite Answer: Out of the following materials: It is flexible, resistant to moth, oil and chemicals. Fill in the blanks with appropriate words. They melt on heating. Question 50. (B) Nekamine Explain why, the disposal of plastic wastes is a major problem. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. A. wool Is it thermoplastic or thermosetting plastic? give reasons for your choice? Plastic is non-biodegradable. Question 58. (d) PVC (Polyvinyl chloride) is used for making wire insulation. (d) which material is used as a substitute for glass? Answer: Give two reasons only. Nylon is the first fully synthetic fibre. D. acrylic (c) which material is used as a substitute for wool? B. melamine NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. It was made in 1931, without the use of any natural raw material from plants or animals. What are synthetic fibres? Due to its excellent insulating properties it is used for making switches and other electrical appliances. It is used to make floor tiles, kitchenware and fire resistant fabrics. A combination of two different initiators is often used to give a uniform rate of polymerization. (e) Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. Question 6. Rayon is obtained by the chemical treatment of wood pulp or cellulose causing deforestation. Question 11. It is used to make electrical switches and handles of utensils. (d) Which fibre (A, B or C) contains the same type of groups as those in a PET jar? These units are made of chemical substances. Arrange the following fibres in the order of increasing strength (keeping the fibre of least strength first): Nylon, Cotton, Wool, Polyester, Silk Answer: This is can be reduced by use paper or jute bag. Polyester is the synthetic fibre which is made up of repeating units of a chemical called an ester. Rayon is obtained by the chemical treatment of wood pulp or cellulose. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. If the clothes made of synthetic fibres catch fire, it can be very dangerous. Coming from Engineering cum Human Resource Development background, has over 10 years experience in content developmet and management. Thus, the handle is made of plastic while the bristles are made of nylon. Terylene is a kind of a polyester. C. rayon (A) Nylon It is the man-made fibre which is regarded as artificial silk. Frying pan handles are made with thermosetting plastics which are resistant to fire and can tolerate heat better than other plastics. (d) for making insulation of electric wires? Question 67. Thermoplastic materials are made of polymers which are linked by intermolecular forces, forming linear or branched structures. PVC is a thermoplastic. D. polyester Therefore, we must avoid the use of plastic as much as possible. The arrangement of units in a plastic can be linear or cross-linked. (iii) Rayon Question 72. Answer: Question 49. B. melamine It remains crisp and easy to wash. C. rayon Give one use each of bakelite, nylon and acrylic. Bakelite was used for many things when it first came to light. The full form of PVC is polyvinyl chloride. Name a popular polyester. (D) Ashtray Question 9. Question 26. The plastics which cannot be softened by heating, when moulded once are called thermosetting plastics. Polythene bag and PVC pipe are the thermoplastics which can be recycled. Answer: (a) Terylene and PET are polyesters. Rayon is obtained by the chemical treatment of wood pulp or cellulose. State the characteristics of synthetic fibres. Answer: (b) Teflon is used for giving non-stick coating on frying pans. Question 66. It takes several years for plastic to decompose and it is not environment friendly. Uses of Bakelite. Question 27. Name the natural polymer from which cotton is made. It requires the cutting of a lot of trees which leads to deforestation. Question 24. Such small units combine to form a large single unit called a polymer. (d) PET is a material used as a substitute for glass. (C) Polythene It was prepared from coal, water and air. Answer: Bakelite is used for making plugs and switches. For example, cotton is a natural polymer which is made from the cellulose. It takes several years for plastic to decompose and it is not environment-friendly. Name the man-made fibre which is regarded as artificial silk. Polyester is the synthetic fibre which contains the organic group similar-to those which give fruits their sweet smell. Answer: It is also used for making parachutes and ropes for rock climbing. The synthetic fibre A is chemically a polyamide whereas the synthetic fibre B contains a large number of ester groups. Plastics are poor conductors of heat and electricity and can be used for making handles of frying pans. What are plastics? It is used for making bottles and utensils which is replacing materials like glass. Answer: Based on the arrangement of monomers, plastics are of the following types: Question 30. Polythene and poly vinyl chloride are thermoplastics. Rayon is different from truly synthetic fibres because: D. B and D Polyester is the synthetic fibre which is made up of repeating units of a chemical called an ester. It is flexible, resistant to moth, oil and chemicals. D. Acrylic, Silk, Wool. 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