If the clothes catch fire, it can be disastrous. 4) Recover: We can recover or restore the resources into their original state, wherever possible. The term polymer means large molecules with higher molecular mass. This preview shows page 1 - 2 out of 2 pages. b) Rayon. After reading NCERT Books, you have just to go through these questions to prepare the entire chapter for exams. Class 8 Science Chapter 3 Important Questions of Synthetic Fibres and Fabric. Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. Each small unit is actually a chemical substance. The plastic material chokes the respiratory system of these animals, or forms a lining in their stomachs and can be the cause of their death. These fibres are made from petrochemicals. The formation process of these two types of plastics also differs. Polymerization in the simplest form can be described as a chemical process that results in the formation of polymers. Such as plastic. Generally, people love to wearing polyester shirts and other dresses. 3) Melamine is used for making floor tiles and kitchenware. Bakelite is a man-made (synthetic) material while Melamine occurs naturally (is organic). What do you mean by “thermoplastic” and “thermosetting plastic”? ii) Buy products without a little plastic packaging. For example, polyethene and polyvinyl chloride. It remains crisp and is easy to wash. When we add hot water to a plastic bottle, it gets deformed. A material which gets decomposed through natural processes, such as action by bacteria, is called biodegradable. d) Silk 10 The coating on modern non- stick cookware and electric iron is of. Bakelite Structure. These are prepared from a type of synthetic fibre, called acrylic. A synthetic fibre is also a chain of small units joined together. 2) The burning of plastic waste gives out harmful gases which pollute the air. The term Bakelite is sometimes used in the resale market to indicate various types of early plastics, including Catalin and Faturan, which may be brightly colored, as well as items made of Bakelite material. Write down their some features. Bakelite definition, a brand name for any of a series of thermosetting plastics prepared by heating phenol or cresol with formaldehyde and ammonia under pressure: used for radio cabinets, telephone receivers, electric insulators, and molded plastic ware. The chemical formula of bakelite can be written as (C 6 H 6 O-CH 2 OH) n. What are the Desirable Properties of Bakelite? Such fibre was obtained by chemical treatment of wood pulp. Towards the end of the nineteenth century, scientists were successful in obtaining a fibre having properties similar to that of silk. There are some plastic articles which can bend easily while some break when forced to bend. Question 7. “Avoid the use of plastic as for as possible”. Why do people always prefer to choose plastic instead of using metals? It is used for making floor tiles, kitchenware and fabrics which resist fire. Why? Should we not think twice before doing so? Ask your doubts related to NIOS or CBSE Board and share your knowledge with your friends and other users through Discussion Forum. “Despite being very useful, it is advised to restrict the use of plastic”. That is why electrical wires have plastic covering, and handles of screw drivers are made of plastic. In the process it releases lots of poisonous fumes into the atmosphere causing air pollution. v) Do not throw plastic waste in the street on the pavement or in drains. Plastics are poor conductors of heat and electricity. We should use of bags made of cotton or jute instead of plastic bags when we go for shopping. iii) Use bags made of cotton or jute or recycled paper, when you go for shopping. Which type of plastic is used for non-stick coating on cook-wares? Bataan Peninsula State University in Balanga, Bataan Peninsula State University in Balanga • BSME 101, Cracking the Sat Biology E_M Su - The Princeton Review.pdf, Bataan Peninsula State University in Balanga • CEA 0223, Bataan Peninsula State University in Balanga • BSAR 13-00215, Bataan Peninsula State University in Balanga • BSME 5C, Bataan Peninsula State University in Balanga • NURSING 103, Bataan Peninsula State University in Balanga • CHEM MISC. Teflon is a special plastic on which oil and water do not stick. Bakelite is a poor conductor of heat and electricity. Nylon is another man-made fibre. Plastic takes several years to decompose; it is not environment friendly. Which type of fibre is used in his sweater? Fabric made from this fibre does not get wrinkled easily. After studying the NCERT Books, important Questions provide a proper revision of the chapter for exams. Manufacturing Synthetic Fibres is Actually Helping Conservation of Forests, NCERT Solutions for Class 6 Social Science, NCERT Solutions for Class 7 Social Science, NCERT Solutions for Class 8 Social Science, NCERT Solutions for Class 9 Social Science, NCERT Solutions for Class 10 Social Science, NCERT Solutions for Class 11 Business Studies, NCERT Solutions for Class 11 Physical Education, NCERT Solutions for Class 12 Business Studies, NCERT Solutions for Class 12 Physical Education, CBSE Sample Papers for Class 10 Session 2020-2021, CBSE Sample Papers for Class 12 Session 2020-2021, Class 8 Science Chapter 4 Important Questions, Useful Tips To Score Good Marks On Programming Assignments, Top Essay Writing Service with Tons of Pros. c) Nylon. Class 8 Science Chapter 3 Extra Questions are prepared for academic session 2020-21 and it provides the complete revision of NCERT Book of Class 8 Science Chapter 3. It can be drawn into very fine fibres that can be woven like any other yarn. Answer: (a) 9. Today if we think of storing a food item, water, milk, pickles, dry food, etc., plastic containers seem most convenient. A material which is not easily decomposed by natural processes is termed as non-biodegradable. Check the below NCERT MCQ Questions for Class 12 Chemistry Chapter 15 Polymers with Answers Pdf free download. Can you write a name of a “Natural polymer”? Hence, “manufacturing synthetic fibres is actually helping conservation of forests”. Answer. Although synthetic fibre catches fire easily, it is interesting to know that the uniforms of firemen have coating of “melamine plastic” to make them flame resistant. Examples – Bakelite, melamine, etc. Bakelite and Melamine are the example of thermosetting plastic. Question 8. Important Questions and Extra questions are prepared to revise the chapter 3 of Class 8 Science. This fibre was called rayon or artificial silk. Bakelite and Melamine are the example of thermosetting plastic. Question 13. Orientation of monomer units in a polymer molecule A. Tacticity B. Graft C. Linear D. Monomer arrangement 11. Besides, the burning process in the synthetic material is quite slow and it does not get completely burnt easily. Example : Polyethene, Polyvinyl chloride (PVC) etc. Can you guess why? There are some of the steps which contribute towards the reducing the use of plastic materials by us. Polyvinyl chloride has heavy metals such as cadmium and lead which are toxic and harmful to our health. It contributes sturdy structure to the plants. iii)Synthetic fibres are less expensive and readily available in the market. (adsbygoogle = window.adsbygoogle || []).push({}); Copyright 2021 by Tiwari Academy – A step towards Free Education, NCERT Solutions for Class 8 Science Chapter 3, Class 8 Science Chapter 3 Important Questions. 2) Bakelite is a poor conductor of heat and electricity so, it is used for making electric switches and handles of the utensils. Polythene and PVC are some of the examples of thermoplastics. They are also referred to as macromolecules. This is because of their light weight, lower price, good strength and easy handling. iv) Synthetic fibres are extremely fine and shiny. How is plastic made? Write down their some features. Cotton is a natural polymer, called cellulose. Instead we can reuse them. “In every year, Boojho likes to wear a sweater which appear to resemble like wool”. b) Rayon. Burning of plastics and synthetic fabrics produces lots of poisonous gases causing air pollution. use a steel lunch box instead of a plastic one. ii) Synthetic fibres are light, wrinkled free and easy to maintain. It is further classified into, Homopolymers:Polymers formed by the polymerisation of a single monomeric species. All organic compound comes to this category. But plastics do not react with water and air. These are called synthetic fibres. All organic compound comes to this category. Give example to show that plastics are non-corrosive in nature. Answer: Plastics are non-reactive, so they can be used for storing chemicals. Write down some characteristics of synthetic fibre. Some examples are natural gas or even corn, wheat, or rice. b) Silk. Why do people always prefer to choose plastic instead of using metals? Therefore, this fibre is referred as artificial silk or man-made fibre. Synthetic fibres are more durable and affordable which makes them more popular than natural fibres. Melamine is a versatile material. So, a polymer is made of many repeating units. These cannot be re-melted. Generally, shirt, trousers, bed sheets, blankets, curtains, table-cloths, towels and dusters are made from different kinds of fibres. The list is endless if we start counting articles like slippers, furniture and decoration pieces, etc. Such plastic which gets deformed easily on heating and can be bent easily are known as thermoplastics. Course Hero is not sponsored or endorsed by any college or university. Plastics find extensive use in the health-care industry. Although, polyester (Poly+ester) is actually made up of the repeating units of a chemical called an ester. 1) Reduce: We must reduce the use of resources as possible and save them for the future generation. Boojho wants to know that which type of plastic is used for the coating of uniforms of fireman? The first human-made plastics were actually made using cellulose from plants. Synthetic fibres are man-made fibres. A. Bakelite B. Melamine C. Branched D. Poly-vinyl chloride 9. Such as animals, trees, cotton, jute. Question 14. Reducing the usage is a method of conservation of resources. Bakelite and melamine are some examples of thermoplastics Answer: False Correct statement: Bakelite and and melamine are some examples of thermosettingplastic. Why is it so? Plastics are often made from petrochemicals like crude oil but can also be made from other materials. These monomers add together to form a long chain to form a product with spe… These are called thermosetting plastics. Answer: Thermosetting – bakelite, melamine Thermoplastics – combs, toys. v) Synthetic fibres absorb very little water. Therefore, people always prefer to choose plastic instead of using metals. For example, Bakelite, and Melamine formaldehyde. It is used for making electrical switches, handles of various utensils, etc. In 1927 the Bakelite patent expired. iv) Collect and dispose of biodegradable and nonbiodegradable waste separately. a) Terrycot. Acrylic blankets are cheap, light in weight, more durable and are available in variety of colours and designs. i)Synthetic fibres are very strong and durable. The fabric melts and sticks to the body of the person wearing it. Jammu & Kashmir has banned the use of plastic bags. A material which is not easily decomposed by natural processes is termed as non-biodegradable. She preferred to buy an acrylic blanket”. 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