A. View Answer. Polymers also occur in nature. It is the man-made fibre which is regarded as artificial silk. Thermosetting plastics: The plastics which when moulded once, cannot be softened by heating are called thermosetting plastics. PET is a very familiar form of polyester. Wrangle unruly cords by sliding them through a piece of PVC conduit to clean … (b) Polymer D is Cellulose. B. melamine Acrylic is a synthetic fibre which appears to resemble wool. Now coming to the uses of Bakelite, since this element has a low electrical conductivity and high heat resistance it can be used in manufacturing electrical switches and machine parts of electrical systems. Polyester is the synthetic fibre which contains the organic group similar-to those which give fruits their sweet smell. C. A and C Nylon is used in textile industry to produce clothes. Question 5. Question 10. PET is a very familiar form of polyester. A combination of two different initiators is often used to give a uniform rate of polymerization. Bakelite is thermosetting plastic. C. terylene Why are thermoplastics not used for making frying pan handles? Polythene is a thermoplastic. The materials which gets decomposed through natural processes, such as by the action of microorganisms are called biodegradable materials. For example, we must use a steel lunch box or steel containers instead of plastic ones. Cellulose is made up of a large number of glucose units. Its polymer chains are joined together by cross-links, so they cannot slide past each other easily. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. In case of thermoplastics, the shape hardens when it is cooled, but can be reshaped when heated up again. Question 64. In order to achieve this, we must not throw plastic in the water bodies or on the roads. Give two reasons only. For example, peels of vegetables and fruits, cotton clothes, wood and paper are biodegradable substances. B. melamine Explain why, plastic containers are preferred for storing food. Write the uses of acrylic fibres. (b) Plastic bags thrown in the garbage can be swallowed by the animals such as cows. Answer: A. The disposal of plastic wastes is a major problem because of the following reasons: Question 47. Which plastic is used: A. nylon Polymers also occur in nature. Question 14. For example, we must use a steel lunch box or steel containers instead of plastic ones. C. rayon C. nylon The British children's construction toy Bayko, launched in 1933, originally used Bakelite for many of its parts, and took its name from the material. Give two examples of each type of plastics. B and C For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. D. Teflon B. acrylic Question 39. Question 37. PVC was originally developed to replace the rubber and glass that was historically used to make flexible tubing and containers. Question 9. Which of the two is a thermosetting plastic: PVC or bakelite? Plastic articles are available in all possible shapes and sizes. The disposal of plastic wastes is a major problem. Nylon fibres is very strong, elastic and light. Question 26. B. Bakelite requires two monomers- phenol and formaldehyde. Polyester is the synthetic fibre which contains the organic group similar-to those which give fruits their sweet smell. It is used to make electrical switches and handles of utensils. Explain how, the use of plastics has a bad effect on the environment. Give reasons for your Answer:. Which of the following has cross-linked polymer chains? Hence, it became very popular for making clothes. PVC is used extensively across a broad range of applications (used in building, transport, packaging, electrical etc. We must take a cotton carry bag or a jute bag while shopping. We must try to minimize the use of plastic materials. B and C Polyvinyl Chloride for Prototype Development on CNC Machines, 3D Printers, & Injection Molding Machines: There are two main issues working with PVC that make it fairly problematic and not generally recommended for use by non-professionals. View Answer. (i) terylene could be the synthetic fibre B which contains a large number of ester groups. (c) Bakelite is used for making handles of frying pans. (iii) Nylon could be the fibre A which is chemically a polyamide is nylon. Making electric fittings such as electric switches, Making plugs and sockets. Question 72. Rayon is the man-made fibre prepared from the natural materials. It is used to make floor tiles, kitchenware and fire resistant fabrics. The plastics which when moulded once, cannot be softened by heating are called thermosetting plastics. Question 22. Question 78. It can be recycled, reused, coloured, melted and can be rolled into sheets or made into wires. It can result in choking their respiratory system and can be fatal. A and B The plastics which when moulded once, cannot be softened by heating are called thermosetting plastics. A. it has a silk-like appearance Modern healthcare would not be possible without the use of plastic materials. B. nylon Explain why, the disposal of plastic wastes is a major problem. B. flax A. both are non-biodegradable Presented here are the properties and other uses of Bakelite you should know about. It causes environmental pollution. It is the man-made fibre which is regarded as artificial silk. Question 44. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ … Bakelite is a thermosetting plastic. C. acrylic It is used to make floor tiles, kitchenware and fire resistant fabrics. What are synthetic fibres? What is Bakelite Plastic? Answer: If the clothes made of synthetic fibres catch fire, it can be very dangerous. D. B and D Answer: D. rayon A. bakelite We must take a cotton carry bag or a jute bag while shopping. It does not get completely burnt easily. Question 31. Acrylic is used as a substitute of natural wool for knitting sweaters, blankets etc. (adsbygoogle = window.adsbygoogle || []).push({}); Copyright © 2010-2018 Difference Between. "The Material of a Thousand Uses" Bakelite's properties make it suitable for several uses including a molding compound, binding agent, varnish, and protective coating. It is also used for making parachutes and ropes for rock climbing. A material which is not easily decomposed by natural processes is termed as non-biodegradable. Teflon is used for nonstick coating on cookware. The manufacture of one of the following artificial fibres contributes to deforestation this fibre is : It is lustrous and easy to wash. Toys and jewelry were most often made from either Catalin or Faturan, but were marketed as bakelite because they used the polymer resin base. Plastic is non-biodegradable. It was prepared from coal, water and air. It is used for making bottles and utensils which is replacing materials like glass. Polycot, poly wool and terry cot are popular polyesters. Answer: Teflon is used for nonstick coating on cookware. A synthetic fibre is made of small units which are joined together. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. It does not react with water and air. It is used to make electrical switches and handles of utensils. Therefore, we must avoid the use of plastic as much as possible. Rayon is obtained by the chemical treatment of wood pulp or cellulose. It is one of the most widely used polymers in the world. Is it possible to add recycled plastic to bakelite? It is used for making parachutes and rock climbing ropes. These are used in the manufacturing of toys, combs and different types of containers. A nylon thread is actually very strong than steel wire. The plastic which is coated on the uniforms of firemen to make them fire-resistant is: Which of the two is a thermosetting plastic: PVC or bakelite? It remains crisp and easy to wash. Silk is the strongest fibre whereas wool is the weakest in terms of strength. Nylon has the ability to show variation of luster. We must develop the habits which are environment friendly. D. polyester If the clothes made of synthetic fibres catch fire, it can be very dangerous. (c) Used to make non- stick cookware Nylon is the first fully synthetic fibre. The arrangement of units in a plastic can be linear or cross-linked. Following are the uses of nylon: Question 20. Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. Question 53 A. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. C. polyester Temperature and sunlight may also play roles in the decomposition of biodegradable plastics and other materials. Rayon is obtained by the chemical treatment of wood pulp or cellulose. (iv) Nylon (c) Acrylic is used as a substitute for wool. For example, polythene and PVC are thermoplastics. (C) Terylene B. rayon Answer: Acrylic is the synthetic fibre feels like wool and used as a substitute for wool. It causes environmental pollution. The reaction involved is condensation reaction in the presence of either a basic or acidic catalyst. This is can be reduced by use paper or jute bag. Answer: Question 65. It also discourages the growth of bacteria and does not cause any skin allergies. Question 24. (b) Name the polymer D. Rayon is obtained by the chemical treatment of wood pulp or cellulose. Answer: Question 42. Question 32. Answer: The handle and bristles of a toothbrush should be made of different type of plastic material. Thermoplastics gets deformed easily on heating and can also be bent easily. What is rayon? Question 56. The clothes made from acrylic are relatively cheap and are available in a variety of colours. View Answer. State the important properties of nylon. Rayon is different from truly synthetic fibres because: It releases lots of poisonous fumes into the atmosphere when burned and causes air pollution. Plastics are used in the packaging of tablets, syringes, doctor’s gloves and a number of medical instruments. Question 1: Write the names and structures of the monomers of the following polymers: (i) Nylon-6,6 (ii) Bakelite (iii) Polystyrene Answer: Question 2: Write the names and structures of the monomers of the following polymers: (i) Glyptal (ii) Teflon (iii)Nylon-6 Answer: Question 3: Write the name and structures of the monomers of the following polymers: (i) Buna-S (ii) Glyptal (iii) Polyvinyl chloride Answer: Question 4: Write the names and structures of the monomers of the following polymers: (i) Nylon-6 (ii) Novolac (iii)B… The full form of PVC is polyvinyl chloride. Question 2. View Answer. (ii) It is used in making bristles for brushes, ropes. Answer: Question 17. (ii) Teflon – (c) Used to make non- stick cookware Ans: The full form of PVC is ‘ Polyvinyl chloride’ PVC is a thermoplastic. We should buy cotton shirts to wear in summers. It is a special plastic on which oil and water do not stick. B. silk (a) Plastic is non-biodegradable. (c) Fibre C is prepared from a natural raw material. Which of the following articles made of plastics ‘can be recycled’ and which cannot be recycled’ ? D. Acrylic, Silk, Wool. Hence, a polymer is made of many repeating units. Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. CH2O)n. Its chemical name is “polyoxybenzylmethylenglycolanhydride”. Based on the arrangement of monomers, plastics are of the following types: Question 30. (d) paper or jute bag Disposal of plastic is a major problem. C. Teflon Answer: Frying pan handles are made with thermosetting plastics which are resistant to fire and can tolerate heat better than other plastics. Answer: Question 74. (a) which materials are polyesters? Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. D. rayon Answer: products), and this can be attributed to its highly versatile nature. (C) PVC pipe Question 73. Phenolic resins are the result of a condensation reaction of phenol and formaldehyde. It is used to make floor tiles, kitchenware and fire resistant fabrics. Centuries later the Iron Age introduced iron as the material of choice. A synthetic fibre is made of small units which are joined together. D. polyester Fill in the following blanks with suitable words: Teflon is a special plastic on which oil and water do not stick. It can also be dyed in a variety of colours. PET is used for making bottles, utensils, films and wires. Bakelite was used for many things when it first came to light. D. Bakelite Answer: During World War II, Bakelite was used in a variety of wartime equipment including pilot's goggles and field telephones. B. (D) Bakelite Question 23. Following are the biodegradable materials: Woollen clothes, paper, peels of vegetables and fruits, Cotton cloth and Jute bag. Polythene is a thermoplastic polymer. It is obtained by the chemical treatment of wood pulp or cellulose. Answer: Column B The properties of Bakelite are studied to get information regarding its commercial usage. (b) Synthetic fibres are made from raw materials called…………. This is because cotton absorbs sweat from our body and allows it to evaporate into the air. The arrangement of units in a plastic can be linear or cross-linked. 14. For example, polythene and PVC are thermoplastics. Create custom Assignments. Answer: Frying pan handles are made with thermosetting plastics which are resistant to fire and can tolerate heat better than other plastics. Question 29. Due to its excellent insulating properties it is used for making switches and other electrical appliances. Answer: Question 76. 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