8.Plastics arrangement is _____ (a)Linear (b)Cross linked (c)Linear as well as cross linked (d)None of these. [10] MAINTENANCE. Plastics are also polymers.They consist of very long molecules made by joining many small molecules together. Question 9 Write 2 characteristics of melamine? Since materials have these properties it makes the materials useful and purposeful to use. The plastics posses excellent electric insulating properties. Melamine plastic is used in the uniforms of firemen which make them flame resistant. Your email address will not be published. 10.Name the plastic, which deformed easily on heating and can be bent easily. Special plastic cookware made of melamine is used in microwave ovens for cooking food. Short Q&A: Q1: Differentiate between natural and artificial fibres. ... NCERT Solutions for Class 8 Science Chapter 3 – 5 Mark Questions and Answers. This strong and transparent plastic is a popular choice for light fixtures, beverage dispensers, and dishes. Plastics may be amorphous solids, crystalline solids, or semicrystalline solids (crystallites) or any other form of solids. Characteristics properties of plastics. (a)Polyster (b)Plastics (c)Both of these (d) None of these. They can be made transperent or color. See other topics from Chapter 3 Synthetic Fibres and Plastics, Biodegradable and Non-biodegradable material, Steps to save environment from plastic waste, NCERT Solutions for Class 10 हिन्दी – क्षितिज – Chapter 5 – उत्साह और अट नहीं रही है, NCERT Solutions for Class 10 हिन्दी – क्षितिज – Chapter 4 – आत्मकथ्य, NCERT Solutions for Class 10 हिन्दी – क्षितिज – Chapter 3 – सवैया, कवित्त – देव, NCERT Solutions for Class 10 हिन्दी – क्षितिज – Chapter 2 – राम लक्ष्मण परशुराम संवाद, NCERT Solutions for Class 10 हिन्दी – क्षितिज – Chapter 1 – पद. For chemically resistant plastic, view our Chemical Resistance of Plastics chart. Synthetic Fibres and Plastics. Durability. In general different properties of materials are enlisted below. Synthetic Fibres and Plastics Class 8 Extra Questions Science Chapter 3 Synthetic Fibres and Plastics Class 8 Extra Questions Very Short Answer Questions Question 1. Oil and Water do not stick on a plastic called Teflon,So Teflon coating is used in utensils FireProof Melamine Plastics do not catch fire easily So they are used to make uniform of fireman which makes them flame resistant Disadvantages of Using Plastics Plastics are Non Biodegradable They do not get easily decomposed by natural processes Chemical Properties of Plastic. Synthetic Fibres and Plastics - Chapter Wise CBSE Solved Question and Answer Based On NCERT. The plastics that act as insulators mostly have a high dielectric strength. Plastics can be bolted, drilled, glued, clamped or simply push fitted in position. Plastics are also polymers.They consist of very long molecules made by joining many small molecules together. The plastics, have low specific gravity, the average being 1.3 to 1.40. 16.6 Can a Visually Challenged Persons Read and Write? Plastics come from polymers, hence all plastics are polymers, but not all polymers are plastic. *Question 2* List three steps you can take to reduce the danger that plastic pose to the environment? 5. Different types of synthetic fibres like, Rayon fibres, Nylon fibres, Polyester fibres and Acrylic fibres have been explained. explains properties like plastic is nonreactive, plastic is light strong & durable, etc for CBSE Class 8 Science. 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. Question 10 Write 1 characteristics of teflon? ... We can modify the chemistry of the material to provide specific beneficial properties for its end use, including the option to make it softer, harder, malleable, or durable. PLASTIC 1. NCERT Book for Class 8 Science Chapter 3 Synthetic Fibers and Plastics is available for reading or download on this page. Synthetic Fibres and Plastics Class 8 Science Chapter 3 as per NCERT Book used in CBSE and other Schools. Hurry! Polyethylene Terephthalate (PET or PETE or Polyester) PET is also known as a wrinkle-free fiber. She has started this educational website with the mindset of spreading Free Education to everyone. Professionals, Teachers, Students and Kids Trivia Quizzes to test your knowledge on the subject. Also, you may want to use our Plastic Material Selection Guide or Interactive Thermoplastics Triangle to assist with the material selection process based on your application requirements. Acrylic plastic is a polymer material that contains acrylic acid. Your email address will not be published. Prepared by :- MOHAMMAD SIDDIQ SALIM III SEM - II YR B-arch POORNIMA UNIVERSITY, jaipur 2. It is used for making floor tiles,unbreakable kitchenware,ashtray and fire resistant fabric. Last Updated on September 29, 2020 By Mrs Shilpi Nagpal 3 Comments. Painting and polishing is not necessary. 2. 1. Materials are most of all the objects and therefore materials have its own properties. Answer: Cotton Question 2. 9. For Ex:Polythene,Polyvinyl chloride,Bakelite,Melamine,teflon etc. Answer: Nylon, terylene, PET, acrylic, teflon, etc. A) It is non-reactive. Depending on physical properties, plastics are divided into two types: Thermoplastic and thermosetting. Properties of Plastics or Polymers: Properties of plastics or polymers play a vital role in the field of Mechanical Engineering. What properties of plastics make it useful for many things ? The plastics industry is a significant contributor to the global economy. Synthetic fibres possess following unique characteristics: They are durable and inexpensive. 9._____ can be recycled, reused, melted and rolled into sheets. 6. For that, in this article, I am exploring the necessary properties of polymers in a detailed manner. CBSE Science Class 8. Required fields are marked *. Question 8 Write 2 characteristics of bakelite? A plastic is a synthetic material which can be moulded or set into desired shape when soft and then hardened to produce a durable article. There is no maintenance cost for plastic articles i.e., they do not need painting and polishing. Dismiss, 1.1 Agricultural Practices and Cropping Pattern, 1.01 Agricultural Practices and Cropping Pattern, 1.06 Protection from Weeds and Harvesting, 1.07 Storage of Foodgrains and Food From Animals, Chapter 1 Crop Production and Management - Test, 2.1 Microorganisms: Classification and Habitat, 2.01 Microorganisms: Classification and Habitat, 2.04 Food Preservation and Food Poisoning, 2.05 Nitrogen Fixation and Nitrogen Cycle, Chapter 2 Microorganisms Friend and Foe - Test, 3.1 Synthetic Fibres and their properties, 3.01 Synthetic fibres and their properties, Chapter 3 Synthetic Fibres and Plastics - Test, 7.01 Physical Properties of Metals and Nonmetals, 4.01 Physical Properties of Metals and Nonmetals, 7.02 Chemical Properties of Metals and nonmetals: Reaction with Oxygen and Water, 4.02 Chemical Properties of Metals and Nonmetals: Reaction with Oxygen and Water, 7.03 Chemical Properties of Metals and Nonmetals: Reaction with Acids and Bases, and Displacement Reaction, 4.03 Chemical Properties of Metals and Nonmetals: Reaction with Acids and Bases, and Displacement Reaction, Chapter 4 Materials: Metals and Nonmetals - Test, 10.2 Types of Combustion Reaction, Ignition Temperature and Fire Control, 6.02 Types of Combustion Reaction, Ignition Temperature and Fire Control, 6.3 Conservation of Forest and Wildlife: Wildlife Sanctuary and Biosphere Reserve, 7.03 Conservation of Forest and Wildlife: Wildlife Sanctuary and Biosphere Reserve, 6.4 Conservation of Forest and Wildlife: National Park, 7.04 Conservation of Forest and Wildlife: National Park, 7.05 Recycling of Paper and Reforestation, Chapter 7 Conservation of Plants and Animals - Test, 11.2 Variety in Cell Number, Shape and Size, 8.02 Variety in Cell Number, Shape and Size, 10.01 Structure, Function and Parts of Cell: Basic Components, 8.03 Structure, Function and Parts of Cell: Basic Components, 10.02 Structure, Function and Parts of Cell: Other Components and Comparison of Plant and Animal cells, 8.04 Structure, Function and Parts of Cell: Other Components and Comparison of Plant and Animal cells, Chapter 8 Cell - Structure and Functions - Test, 12.2 Sexual Reproduction: Reproductive System, 9.02 Sexual Reproduction: Reproductive System, 13.1 Adolescence, Puberty and Reproductive Phase of Life, 10.01 Adolescence, Puberty and Reproductive Phase of Life, Chapter 10 Reaching The Age Of Adolescence - Test, 3.05 Pressure exerted by Gases and Atmospheric Pressure, 11.07 Pressure exerted by Gases and Atmospheric Pressure, 8.3 Increasing and Decreasing the Friction, 12.03 Increasing And Decreasing The Friction, 9.4 Amplitude, Time Period And Frequency of Vibration, 13.04 Amplitude, Time Period And Frequency of Vibration, 14.02 Chemical Effect of Electric Current, Chapter 14 Chemical Effects of Electric Current - Test, 15.1 Electric Charge: Nature, Types and Transfer, 15.01 Electric Charge: Nature, Types and Transfer, 16.3 Multiple Images, Kaleidoscope and Dispersion, 16.03 Multiple Images, Kaleidoscope and Dispersion. NCERT Solutions Class 8 Science; Plastics. Synthetic fibres are those which are man-made and are obtained by the combination of different types of chemical substance and raw materials such as petrochemicals. It is used for making the handles of various cooking utensils(fry pans,pressure cooker) because, 2)It does not become soft on getting heated, It is used for making electric switches,plugs and sockets because. Plastic is a synthetic material made from a wide range of organic polymers such as polyethylene, PVC, nylon, etc., that can be moulded into shape while soft, and then set into a rigid or slightly elastic form. Question 8. Students who are in Class 8 or preparing for any exam which is based on Class 8 Science can refer NCERT Science Book for their preparation. A plastic is a synthetic material which can be moulded or set into desired shape when soft and then hardened to produce a durable article. Which of the following properties of plastic makes it most convenient for use? Plastics are an affordable material. They are cheap compared to metals. The challenge can be used flexibly as part of the formal science and design and technology curriculum in the UK, […] Plastic has light weight, lower price, good strength and easy handling. Give one use of plastics linked to each of these properties? Types of Plastics. 8. All operations like drilling ,sawing, punching can be done on plastics. (a)Thermoplastics (b)Thermosetting Properties of plastics vary depending on the chemical composition, arrangements and the processing method of its subunits. There are two primary forms of plastic: thermoplastic and thermoset plastics, the use of which is dependent on the application. 11. The main physical difference between the two is that one can be reused time and again, and the other cannot. *Class:- 8 *Sub:- Science *Question 1* List and explain four properties of plastics? Synthetic Fibres and Plastics class 8 Notes Science in PDF are available for free download in myCBSEguide mobile app. To understand the properties of material explore the article! Filed Under: Class 8, Synthetic fibres and Plastics Tagged With: bakelite, melamine, plastics, polythene, polyvinyl chloride, teflon. 9. 16.06 Can a Visually Challenged Persons Read and Write? Polythene:It is a plastic obtained by the polymerisation of a chemical compound known as ethene.It is tough and durable.It is used in making polythene bags,waterproof plastic sheets, bottles,buckets,dustbins. Characteristic properties of plastics: 1. 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. Class 8 Science Plastics Notes and Important Points Plastics Any Synthetic material which can be easily moulded into any desired shape on heating is called plastic.Plastic is also a polymer like the synthetic fibres.There are two types of arrangement in plastics linear and cross linked. 4. Bakelite:It is a very hard and tough plastic.It is a poor conductor of heat and electricity. With its properties, acetal plastics are present in various industrial applications, and it comes in different colors and grades. Chapter 17 Stars and The Solar System - Test, 8.03 Global Warming and Greenhouse Effect, 18.03 The Biogeochemical Cycles - Carbon Cycle and Greenhouse Effect, 18.4 The Oxygen cycle and The Ozone Layer, 18.04 The Oxygen Cycle and The Ozone Layer, 18.8 Pollution of Ganga River: A Case Study, 18.08 Pollution of Ganga River: A Case Study, 18.9 Purification of water and ways to reduce water pollution, 18.09 Purification of water and ways to reduce water pollution, Chapter 18 Pollution of Air and Water - Test. Plastic is strong, light and durable. It is used for making soles of electric irons,giving non-stick coating on cookwares. Pupils investigate the properties of plastics then find solutions to problems caused by plastic waste globally An exciting challenge for pupils aged 8-14 years to develop solutions to the problems caused by plastic waste globally. When you want to apply any type of load on a particular member, you need to know its material properties, density, etc. Plastic uses in various fields. 8. [8] DUCTILITY. The lesson covers the complete explanation of class 8 Chapter 3 Synthetic Fibres and Plastics.Topics covered are Introduction to fibres, kinds of fibres. Characteristics of Synthetic Fibres. 3. They are light weight, smooth and soft than any other fibre. 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. The best app for CBSE students now provides Synthetic Fibres and Plastics class 8 Notes Science latest chapter wise notes for quick preparation of CBSE exams and school-based annual examinations. Use our interactive properties table below to explore by property group, sort, or compare two or more plastic materials. The lesson covers the complete explanation of class 8 Chapter 4 Metals and Non Metals.Topics covered are Introduction to metals, physical and chemical properties of metals. Being lighter as compared to metals, plastics are used in cars, aircrafts and spacecrafts, too. They are poor conductors of heat and electricity. Characteristics of synthetic fibres. 7. Question 4 Give few use of polyvinyl chloride? Name the basic component of animal fibres. Apply coupon WELCOME21 at checkout and avail 21% discount on your order. Synthetic fibres are cheaper than natural fibre. Plastics generally possess sufficient durability, provided they offer sufficient surface … Name some artificial fibres. Question 2 Give few examples of plastics? These solutions for Synthetic Fibres And Plastics are extremely popular among Class 8 students for Science Synthetic Fibres And Plastics Solutions come handy for quickly completing your homework and preparing for exams. TYPES OF PLASTIC. Name a natural fibre. 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