Long Q&A: Q1: “Minimise use of plastics for healthy environment”, comment on this advice. Raw materials for preparation of synthetic fibres are (a) coal (b) petroleum (c) natural gas (d) all of these. Cotton is a soft, fluffy staple fibre that grows in a boll, or protective capsule, around the seeds of cotton plants. The amide molecules are obtained from petroleum products by complex chemical process. acrylic. Cotton cloth absorbs water efficiently and burns at a moderate speed. 4. Toothbrush. A. Lycra. another synthetic fibre C is made of a polymer D which consists of a number of glucose units joined one after the other. This list may not reflect recent changes (). Synthetic fibers are made from different chemicals, having their own properties. You can refer to NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams. 25. Which of the following is not made up off nylon. View Answer. Give examples which indicate that nylon fibres are very strong. so it is not synthetic. Also write the false statements in their correct form. Question 3. Q14. Which one of the following is not a synthetic fiber. Jute) and pericyclic fibres (e.g. III. B. Rayon. Explain why some fibres are called synthetic. Plant fibres include epidermal trichomes, such as cotton, and other fibrous tissues of plants, such as phloem fibres (e.g. Page No 32: Question 9: Fibres are made from melted plastic by passing it through fine holes in a _____ Answer: Fibres are made from melted plastic by passing it through fine holes in a spinneret. (a)polyester (b)nylon (c)acrylic (d)silk 2 See answers nitya67 nitya67 Silk is not a synthetic fibre mariospartan mariospartan Answer: Silk is not a synthetic fiber. ( Inme se Kya nylon se bna hua nhi hota.) (i) The fabric terywool is obtained by mixing terylene and wool. Question 14. Chapter 3 Synthetic Fibre Objective Questions . Which synthetic fibre is called artificial silk? Sling manufacturers may use as many turns as they need and may use as many pieces as they like by using a simple join, often made with a basic … Synthetic fibers are more in length and are long lasting. (i) Natural fibres — Cotton (ii) Man-made or synthetic fibres — Nylon (iii) Mixed fibres — Terycot 3. (a) Nylon (b) Cotton (c) Silk (d) Wood. Additionally it is wrinkle and mildew resistant – properties that most common natural fibres do not have. 3. Wool is a natural fibre obtained from the body of many animals. The nylon fibers are elastic, strong and water resistant. None of the answers are correct; there's no real difference between synthetic and natural fibers. (a) Plastic (b) Wood (c) Cement (d) Nylon. Question 1. Synthetic fibers are made of polymers that do not occur naturally, and are produced entirely in the laboratory, most generally from petroleum byproducts. 9.No dust or impuritites contain in synthetic fiber. (a) Acrylic (b) Nylon (c) Polyester (d) Rayon. Wool. Polyester and nylon are the examples of synthetic fibre. Thousands of monomers are coupled together by poly-addition (e.g. Which of the following groups contain only synthetic fibres? Multiple Choice Questions (MCQs) Which of the following is not a man-made material? On the down side, however, along the petrochemical origin, polyester fabrics have a “plastic” handle. Cotton. Cellulose acetate. Explain why plastic containers are favoured for storing food. This fiber was created as a wool substitute and is soft, warm, resilient and great for making lightweight blankets? 4. A. nylon B. flax C. acrylic D. polyester Answer: B. flax Flax is a blue-flowered herbaceous plant that is cultivated for its seed and for textile fiber made from its stalks. ‘Manufacturing synthetic fibres is actually helping conservation of forests’. (a) Cotton (b) Nylon (c) Jute (d) Wool Soln: Answer is (b) Nylon ... False- Synthetic fibres do not melt on heating. Nylon is an example of polyamide polymers. This includes the following fibres-Protein fibers like (wool and silk) Cellulose fibers (like cotton and linen). Explain the difference between thermoplastic and thermosetting plastics. That is why they are known as synthetic fibres. answer choices . 10.It is easy to change in fiber structure. 2. It is a superior type of synthetic fiber, which is truly artificial, as it does not use any natural fiber as its raw material. View Answer Q2: Increasing application of synthetic fibres is actually helping in conservation of forests. It has a linear arrangement of monomer units. Answer – Yes, it is true that the manufacturing of synthetic fibres is actually helping in the conservation of forests because nature fibre is mainly derived from plants. The new Australian Standard AS4497:2018 requires that there are at least 11 turns of yarn. Page No 32: Question 1: Why do we wear clothes? nylon . (Inme se konsa Synthetic fibre hei?) NCERT Solutions for Class 8 Science Chapter 3 – 5 Mark Questions and Answers. Answer: (b) Polymers can be both natural and synthetic. Rayon. Answer: Synthetic fibres dry up soon, are durable, less expensive, readily available and easy to maintain. 25. Rayon and acetate are both artificial fibers, but not truly synthetic, being made from wood. Which of the following is synthetic fibre? The synthetic fibre A is chemically a polyamide whereas the synthetic fibre B contains a large number of ester groups. It is prepared by the polymerization of amide molecules. Indicate whether the following statements are True or False. It is a man-made product. 12.Crimp is applied on filament after passing spinneret : 13.Most of the fibers are hydrophilic in nature. Synthetic fibres are not suitable for hot and humid weather as they do not absorb sweat whereas cotton clothes do. Cotton is used in the manufacturing of bedsheets and usually used in summers as it keeps us ventilated. As a result, fibers are also prone to static. Polyester synthetic fibre is durable and resistant to shrinkage and stretch. Synthetic fibres do not absorb water and as a result, they dry faster than cotton or wool. Socks. Terylene is an example of polyester polymers. answer choices . (a) Which fibre could be … The following properties pertain to which fiber: high elongation,affected by sunlight, low absorbency, and high elastic recovery. Which of the following is a bad conductor of electricity? 11.It grows with its natural color. The core consists of a continuous monofilament synthetic fibre yarn. plant fiber from the flax plant; fibers are longer, somewhat brittle. animal fiber coming most often from sheep, but may be goat (mohair), rabbit (angora), camel, alpaca, llama . A synthetic fiber is shiny and silky, while natural fibers are always dull and rough. Synthetic fibers are formed by polymerization process of one or more than one monomer. Synthetic fibers have very low levels of absorbency. The synthetic fibre A is chemically a polyamide whereas the synthetic fibre B contains a large asked Jun 20 in Chemistry by BhratJha ( 44.3k points) synthetic fibers and plastics Answer the following questions in short: 1. Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers. It is used for making goods like toys, combs, containers, etc. A blend of wool and kevlar, the synthetic fibre widely used in body armour, was lighter, cheaper and worked better in damp conditions than kevlar alone. Write the importance of synthetic polymers in our life. This means cutting a lot of trees, which leads to deforestation. Yak, sheep, camel, goat are the common animals which produce fur on their body which can be obtained and used in the production of wool. Flax and Hemp). A. cellulose that is chemically altered to create an entirely new compound not found in nature. Much of the international literature refers to SMF as 'Man Made Mineral Fibres' (MMMF). Natural fibres may be of plant or animal origin. Synthetic fibres are made of polymers that do not occur naturally but instead are produced entirely in the chemical plant or laboratory, almost always from by-products of petroleum or natural gas. Synthetic Fibres & Plastics. Nylon and terylene are produced through condensation polymerisation. polyester) process. kindly match the query from below description- Synthetic fibres are those fibres which have been made artificially, using chemicals. Silk. Polyamides and polyesters are two groups of synthetic fibres with high strength, not easily stretched and used as textile. 1. This is helpful in the manufacturing of mats or carpets that are used at home for decoration. (a) Polymers cannot form fibres (b) Polymers can be both natural and synthetic (c) Polymer is a natural substance (d) Polymer is a synthetic substance. Wool and silk. Free Question Bank for 8th Class Science Synthetic Fibers and Plastics Synthetic Fibres and Plastics Synthetic fibers. 11.Colors are added in the solution bath as required. Pick the synthetic fibre out of the following? 12.It contains natural crimp. Thus, the correct answer is option A. Question 4. Mineral fiber (like asbestos). One of the first synthetic fibers created was rayon in 1910, made by processing and spinning a sticky cellulose or wood pulp solution into a silk-like fiber. iii) True because synthetic clotes melts on exposure to heat iv) False- Plastics are non-biodegradable 26. Car seat belts. 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