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Question 1. Do Not Burn Plastic and Synthetic Fabrics. Therefore, this fibre is referred as artificial silk or man-made fibre. This fabric also drapes well. Hence, it is also known as Artificial Silk. View Answer Generally, people love to wearing polyester shirts and other dresses. 3. 2)Viscose is forced to pass through the tiny holes of metal cylinder into a solution of sulphuric acid when a silk like thread of rayon is formed. A material which gets decomposed through natural processes, such as action by bacteria, is called biodegradable. Different types of synthetic fibres like, Rayon fibres, Nylon fibres, Polyester fibres and Acrylic fibres have been explained. 5)It is used in tyre industry for the manufacture of tyre cod. 5. It absorbs more moisture than cotton. It is known as rayon fibre in United States of America. Viscose is the most common form of Rayon. Rayon filaments are available in three densities: 1.5, 3.0 and 4.5 Action of Heat and Light At 300 deg F or more, VR loses its strength and begins to decompose at 350-400 deg F. Prolonged exposure to sunlight also weakens the fibre due to moisture and ultraviolet light of the sunlight. Key Words: fibers, strength, flaws, fabrics . How would you contribute towards the reducing the use of plastic materials? Therefore, people always prefer to choose plastic instead of using metals. [15] : 8,64,236 DuPont's invention of nylon spanned an eleven-year period, ranging from the initial research program in polymers in 1927 to its announcement in 1938, shortly before the opening of the 1939 New York World's Fair . The tenacity of rayon weakens in diluted acids at high temperatures as well as in concentrated acids at cold temperatures, and it would soften. Due to the deficiencies of both cotton and rayon tensile members, experimentation was carried on with Nylon fibers, however these never gained wide acceptance because of operational problems and today, polyester, fiberglass and aramid fibers are the predominant tensile members on all high capacity V-belts. • It is e asy to dye in a wide range of colours and drapes well. So, a polymer is made of many repeating units. Towards the end of the nineteenth century, scientists were successful in obtaining a fibre having properties similar to that of silk. In 1939, the DuPont company first manufactured NYLON – it was the first synthetic fiber made in the United States. Rayon is recognized by the name viscose rayon and art silk in the textile industry. Rayon is produced from naturally occurring polymers; it may be a really artificial fiber or completely a natural fiber….. Rayon is a semi-synthetic or artificial fiber. Explain why plastic containers are favored for storing food. A. Rayon. Evaluation packet 8 . • It is highly absorbent, soft and comfortable. (c) its fibres can also be woven like those of natural fibres. Types of Synthetic Fibers Rayon: 3.3: Characteristics of Synthetic Fibers: 3.4: Plastics: 3.5: Plastics as Materials of Choice: 3.6: Plastics and the Environment: Synthetic Fibres and Plastics Class 8 Science NCERT Textbook Questions. I. “Generally, we see in a garbage dump where animals eating garbage”. Synthetic Fibres and Plastics Class 8 Science NCERT Textbook Questions. You have read in Class VII that silk fibre obtained from silkworm was discovered in China and was kept as a closely guarded secret for a long time. After studying the NCERT Books, important Questions provide a proper revision of the chapter for exams. Plastic takes several years to decompose; it is not environment friendly. Notes HOTS Questions MCQ NCERT Solutions Sample Questions Test . After reading NCERT Books, you have just to go through these questions to prepare the entire chapter for exams. A synthetic fibre is also a chain of small units joined together. (This is drawback while using for underwear clothing). Synthetic Fibres and Plastics G8 10 Videos 00:40 Hours Share We have already learnt about the natural fibres in our previous classes. It can be drawn into very fine fibres that can be woven like any other yarn. The lesson also covers Plastic- Its types and its advantages and disadvantages. Strength testing machine—if no testing machine is available, please see the attachment for a simple testing machine that can be built by the instructor or by students as a special project. CBSE Class 8 Science Notes , Question Answers provided for NCERT Science Textbook for Class 8. 1)Rayon is used in textile industry for making clothing like sarees, blouses, dresses, socks. Synthetic fibres are cheaper than natural fibre. It is advised to restrict the use of plastic because of the following reasons: 1) The articles made of plastics are non-biodegradable. She preferred to buy an acrylic blanket”. Different types of synthetic fibres like, Rayon fibres, Nylon fibres, Polyester fibres and Acrylic fibres have been explained. Some examples of synthetic fibres are polyester, nylon and acrylic. Rayon is similar to silk but is cheaper than silk. NCERT Solutions for Class 8 Science Chapter 3 – 5 Mark Questions and Answers. Rayon can be dyed in various colours. Plastics are poor conductors of heat and electricity. Although, polyester (Poly+ester) is actually made up of the repeating units of a chemical called an ester. The principle of preshrinking cotton and rayon fabrics is shown in Fig. Rayon cannot be called a natural fibre as it is man-made. It may be attacked by silverfish a… These are called synthetic fibres. View Answer. Why do people choose this type of sweaters? A narrow stream of radiant energy, especially visible light, traveling in a straight or nearly straight line. Rayon is a man-made redeveloped cellulose fiber. Write down their some features. Although rayon is obtained from a natural source, wood pulp, yet it is a man-made fibre. On the other hand, there are some plastics which when moulded once, cannot be softened by heating. Examples of synthetic fibres are rayon, nylon, polyester, acrylic, etc. Type of Module: Lab experiments . (b) it is obtained from wood pulp. There are some of the steps which contribute towards the reducing the use of plastic materials by us. Rayon is a man-made fibre prepared from a natural raw material called cellulose by chemical treatment.The cellulose required for making rayon is obtained from wood pulp.Rayon is obtained by the chemical treatment of wood pulp. Science - Class 8 / Grade 8 (Chapter 01 - 10) Chapter 3 - Synthetic Fibres and Plastics – 3 NCERT Solutions for Class 8 Science PDF free download, NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics, to Study online or download free in PDF form. Characteristics of Synthetic Fibers. Viscose comes from trees, but it is not as environmentally as other types of rayon, such as modal, because the production process uses high concentrations of chemicals. Fibers in this pH range are considered to be “skin-friendly”. Question 2 Name the man-made fibre which is regarded as artificial silk and why? A narrow stream of particles such as protons traveling in a straight or nearly straight line. Explain. vi)Synthetic fibre are not attacked by moths easily. vi) Try to minimise the use of plastic materials e.g. This is because of their light weight, lower price, good strength and easy handling. “Avoid the use of plastic as for as possible”. 16.A Explain effects of processing and manufacturing variations on material 2 properties . Viscose is extremely airy, which makes it nice for blouses and summer dresses. 1)Wood pulp is dissolved in an alkaline solution to form sticky liquid called viscose. For example, we can hear the musical instruments like tabla, flute, a guitar due to vibration. About 8 billion pounds of nylon are produced each year in the U.S. Nylon is an artificial fiber. ... the chapter elucidates the different types of synthetic fibers present that we use in our daily lives like Rayon, Nylon and more. 5 Characteristics of Rayon. Class 8 Science Chapter 3 Important Questions are given below updated for new academic session 2020-21. Crop Production and Management Microorganisms Synthetic Fibres and Plastics Materials: Metals and Non- Metals Coal and Petroleum Combustion and Flame Conservation of Plants Cell - Structure And Functions Reproduction in Animals Reaching the Age of Adolescence Force And Pressure Friction Sound Chemical Effects of Electric Current Some Natural Phenomena Light … Other than that, the students will learn about the characteristics of synthetic fiber for a better understanding of these fabrics. Rayon is a natural-based material that is made from the cellulose of wood pulp or cotton. The wool obtained from natural sources is quite expensive, whereas clothes made from acrylic are relatively cheap. 1) They are stronger than nylon fibres. ii) Synthetic fibres are light, wrinkled free and easy to maintain. Such as animals, trees, cotton, jute. The polybags carelessly thrown here and there are responsible for clogging the drains, too. Polythene and PVC are some of the examples of thermoplastics. They are not corroded easily. Some examples of their use are the packaging of tablets, many bottles, threads used for stitching wounds, syringes, doctors’ gloves and a number of medical instruments and so on. v) Synthetic fibres absorb very little water. Rayon fibre is chemically identical to cotton but it has shine like silk.Since rayon resembles silk in appearance therefore rayon is also called artificial silk. Soft and smooth. So, it is not advisable to burn plastic and synthetic fabrics. Cleanroom Class 100 – 100,000. Due to the deficiencies of both cotton and rayon tensile members, experimentation was carried on with Nylon fibers, however these never gained wide acceptance because of operational problems and today, polyester, fiberglass and aramid fibers are the EU Grade A-D. ValuClean ® Plus . The word ‘polymer’ comes from two Greek words; “poly” meaning “many” and “mer” meaning “part/unit”. Discuss. It is a man-made fibre and cheaper than silk. ... Q12: State the characteristics of synthetic fibre because of which it is used as dress materials. Access all educational video only on Edubull. Drapey. A. Rayon. Rayon has a smooth, comfortable texture that feels soft to the touch, similar in comfort to natural fibers like cotton and linen. CBSE Class 8 Science, CBSE- Synthetic Fibres and Plastics. Class 8 Science Chapter 3 Important Questions of Synthetic Fibres and Fabric. ii) Buy products without a little plastic packaging. CBSE Class 8 Science Chapter 3 Revision Notes PDF Download is available here. Nylon is made of polymers known as polyamid… Why is it so? (adsbygoogle = window.adsbygoogle || []).push({}); Copyright 2020 by Tiwari Academy – A step towards Free Education, NCERT Solutions for Class 8 Science Chapter 3, Class 8 Science Chapter 3 Important Questions. Viscose is additionally weaker than cotton and its strength is reduced to 40-70% once wet. Bamboo fiber is part of the bast family of fibers, which includes such fibers as hemp and flax. These fibres are made from petrochemicals. “Despite being very useful, it is advised to restrict the use of plastic”. 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. Question 1. Rayon is formulated from natural resources like wood pulp, but still it is regarded as synthetic or man-made fibre having characteristics similar to silk. However, rayon fiber is also prone to wrinkles, creases and tears just like natural fibers. Polyester is another synthetic fibre. The shopkeeper showed her blankets made up of acrylic fibres as well as made up of wool. RAYON Fiber – Uses and Properties. Most of the thermoplastics can be recycled. Explain the statement. ... the students will learn about the characteristics of synthetic fiber for a better understanding of these fabrics. 30 Days Study Plan for IBPS RRB Officer Scale 1 and Office Assistant Prelims. Plastics as Materials of Choice. Filed Under: Class 8, Synthetic fibres and Plastics Tagged With: artificial silk, rayon, semi-synthetic fibre, uses of rayon, viscose. 2)It is used to make furnishing such as bed-sheets, curtains, blankets etc. NCERT Class 8 Science book: Chapter 4 - Materials: Metals and Non-Metals. We should use of bags made of cotton or jute instead of plastic bags when we go for shopping. Hence, rayon is also called ‘poor man’s silk’. Rayon has properties similar to those of silk. Plastics. 4) Recover: We can recover or restore the resources into their original state, wherever possible. Normally cellulose from wood is used to make the fibres for fabris but sometimes cellulose from short cotton fibres named linters can also be used. So, basically sound helps us to communicate with the other person. What do you mean by “thermoplastic” and “thermosetting plastic”? Why rayon is referred as “artificial silk” or “man-made fibre”? Many such small units combine to form a large single unit called a polymer. 6) Microfibre or Ultrasuede was invented over 20 years ago in Japan. Acrylic blankets are cheap, light in weight, more durable and are available in variety of colours and designs. Rayon is described as a regenerated fibre because the cellulose, obtained from soft woods or Polymer: The term polymer id derived from two greek words POLY meaning many and MER meaning units.Therefore polymer refers to combination of repeating units. Shiny. Bakelite is a poor conductor of heat and electricity. A thick endless blanket passes around a rotating roller R of comparatively small diameter. Characteristics of Synthetic Fibres. A material which is not easily decomposed by natural processes is termed as non-biodegradable. Synthetic Fibres and Plastics . Some of the examples of synthetic fibres are rayon, … Synthetic Fibres and Plastics G8 Read More » Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. Notes on Synthetic Fibres and Plastics. Characteristics of Sound. The NCERT Solutions for Class 8 science chapter 3 contains all the information about NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and plastics. The sound that we hear around us is the type of energy made by the vibration that travels through the air or any other medium and can be heard when it reaches a person’s ear. CBSE NCERT Solutions for Class 8 Science Chapter 3 . Write down four characteristics of an Ideal fuel. ... the chapter elucidates the different types of synthetic fibers present that we use in our daily lives like Rayon, Nylon and more. Class 8 Science Synthetic Fibres and Plastics Chapter 3 (3/9) Types of Synthetic Fibres Explanation in Hindi, Imp Questions and Answers. Important Questions and Extra questions are prepared to revise the chapter 3 of Class 8 Science. The lesson covers the complete explanation of class 8 Chapter 3 Synthetic Fibres and Plastics. It was made by chemical treatment of wood pulp and was the first synthetic fibre. Tutorial for Learning C Programming: Is It Possible to Learn the Programming Language Online? 3) They are strong,wrinkle resistant,easy to wash and dry,not attacked by moths,has high abrasion resistance,suitable for making dress material. CBSE Sample Paper Class 8 Science SA1 Set 1 (c) Both 27. ... Chapter 3 of NCERT Class 8 science book describes the synthetic fibres and its type (rayon, nylon, polyester and acrylic). It was used in nylon stockings during wartime, but even after the war became preferred over silk, and quickly replaced silk in most hosiery. Class 8 Chapter 3 Synthetic Fibres and Plastics includes different topics like synthetic fibres meaning, types of synthetic fibres, their characteristics, plastics, benefits of plastics, use of plastic as a choice, hazards of plastic on the environment, and exposure to many fibres like nylon, rayon… Rayon, was the first man-made fiber created in 1910 and it was called ‘artificial silk’. This moisture absorbance and softness of the fabric make it ideal for summer wear. We use many articles made from nylon, such as socks, ropes, tents, toothbrushes, car seat belts, sleeping bags, curtains etc. it is 100 times finer than a human hair. Chapter 3 of Class 8 Science deals with different types of synthetic fibres with their importance in our daily life. Synthetic fibres are cheaper than natural fibre. Can you suggest some methods to limit its consumption? Rayon is known for having a sheen, ranging from a low sheen to a very shiny texture. Rayon is soft, breathable, comfortable and moisture absorbent. What is […] Organic solvent: Viscose rayon fiber has enough ability to protest the action of organic solvents. 5 Characteristics of Rayon. The major characteristics or properties of synthetic fiber have listed in the following: Compared to the rayon, synthetic fiber is 2-3 times stronger. In the process of eating the food waste from dump of garbage – “they swallow materials like polythene bags and wrappers of food”. “In every year, Boojho likes to wear a sweater which appear to resemble like wool”. If the clothes catch fire, it can be disastrous. NCERT Class 8 Science Books: National Council of Educational Research and Training publishes NCERT Books for the students of Class 8 Science under the guidance of CBSE. Cotton is a natural polymer known as cellulose which is composed of large number of glucose units. Q3: What are the advantages of artificial silk over natural silk? 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