Plastic is a very generalized term for polymers that can mean either a thermosetting or a thermoplastic Plastic. (f) Polyester fibres like dacron and terene are made from petroleum products. Bakelite is a very poor conductor of heat and electricity and it is used for making electrical switches. (b) Thermoplastics are not used for making saucepan handles. Polythene, polystyrene, PVC, melamine and formica are plastics. Bakelite is a thermosetting plastic, it cannot be molded again whereas Melamine, being a thermoplastic, can be molded any number of times adn reshaped. Students are advised to practice the NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download is available here. The correct statement should be: The material similar to silk in appearance is (a) Nylon (b) Rayon (c) Polyester (d) Terylene. Thermosetting plastics become soft only the first time; when they are reheated, they become hard (take firm shape). Polycot, a blended fibre is made from Thermosetting Plastic: Some plastics do not get deformed on heating, and cannot be re-molded into a new shape. Example: Bakelite, melamine, etc. All questions and answers from the Active Science Book of Class 8 Science Chapter 3 are provided here for you for free. (a) the process by which glass is cooled and made tougher (d) True It is used to make electrical switches and handles of utensils. (b) gas given off when PVC is burnt (e) False 3. ​Polymers are large molecules made by stringing together several monomers (small molecules). (c) large molecules made by joining many small molecules together Rayon looks like silk. What is the sweater most likely made of? Bakelite & Melamine Injection Molding Machine, Model: LCH-H80 toLCH-H500 ; LCH-V100 to LCH-V850, There are two types of injection features: the thermoplastic type and thermosetting plastic type. Plastics are used to cover electrical cables because _____________. It is used in electric switches, plugs, handles of pressure cooker and tea kettle, radio and TV cabinets, etc Bakelite, Melamine, etc are some examples of it. (b) False MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Which of the following statements is true for rayon? Choose the thermoplastics and thermosetting plastics from the following: Melamine, Polythene, Bakelite, Polyvinyl chloride. Bakelite and melamine are examples of thermosetting plastic. Melamine and Bakelite are thermosetting plastics. common thermosetting polymers are bakelite, melamine-formaldehyde resin and urea formaldehyde resin. High quality cp9000 Thermoplastic Resin Powder , Phenol Formaldehyde Novolac For Composite Material from China, China's leading Phenol Formaldehyde Resin product market, With strict quality control Phenol Formaldehyde Resin factories, Producing high quality cp9000 Thermoplastic Resin Powder , Phenol Formaldehyde Novolac For Composite Material products. (b) The odd one is polycot. (c) they can be repeatedly remoulded into desired shapes It is a blended fabric, but rayon, nylon and acrylic are not. 1 Answer +1 vote . 3- Bakelite is a synthetic plastic and Melamine is … Chain Growth Polymerisation or Addition Polymerisation It involves formation of reactive intermediate such as free radical, a carbocation or a carbanion. Plastics are bad conductors of heat and electricity (good insulators). Thermoplastic is used for making combs, toys, buckets, mugs, etc. (a) bakelite, teflon, formica, melamine Explain why, thermoplastics become soft on heating but thermosetting plastics do not become soft on heating. The decorative melamine board has a structure obtained by laminating a surface layer and a core layer. These solutions for Man Made Materials are extremely popular among Class 8 students for Science Man Made Materials Solutions come handy for quickly completing your homework and preparing for exams. (c) Bakelite is used to make plugs and sockets. Without any doubt, that quality as well makes melamine a perfect material for decorative objects. It is usually elastic and soft. Sand (silicon dioxide (SiO2), sodium carbonate (Na2CO3) and calcium carbonate (CaCO3) are the three raw materials needed to make glass. For example, polythene and PVC are thermoplastics. Thermoplastic polymers These are the linear or slightly branched long chain molecules capable of repeatedly softening on heating and hardening on cooling. Polythene and PVC are examples of thermoplastic. giving reasons. (c) Dusters made of nylon or other synthetic materials are good for use in the kitchen. (b) Thermoplastics become soft on heating. Are these statements true or false? The plastics which gets deformed easily on heating and can be bent easily are called thermoplastics. It is a thermoplastic, while bakelite, melamine and formica are thermosetting plastics. This hydrogen chloride gas gets combined with the moisture in the environment to form hydrochloric acid, which is toxic and can cause problems to the human body. 3. They are also insulators of heat and electricity. As plugs and sockets may get heated up while they are being used, Bakelite, a thermosetting plastic, is used for making them. What are thermosetting plastics? It is used to make electrical switches and handles of utensils. Thermoplastic type material can be recycled and reusable, while the runner or material waste for thermosetting plastic type cannot. It is a polymer (synthetic fibre) made up of small chemical molecules called esters. 1. Henry Ford made his own deadly version of Bakelite by mixing phenol, formaldehyde and defatted soybean meal which reacted to create a thermoplastic resin that could be molded under pressure to create durable nonstructural plastic parts, such as radio knobs, light switch pulls, distributor caps, body trim, etc. Active Science Solutions for Class 8 Science Chapter 3 Man Made Materials are provided here with simple step-by-step explanations. (c) The odd one is acrylic. They absorb very less water. (d) sand, sodium carbonate, calcium carbonate. (f) False (b) acrylic The list of materials mentioned above can be classified as Synthetic condensation polymers have a wide array of household, industrial, commercial, and medical uses … They become soft only the first time; they become hard. They are not infected by bacteria or fungus and are resistant to insects. At home, when she burnt a small piece of fibre from the sweater, it smelled like burning plastic. The correct statement should be: (c) Polymers are large molecules made by joining many small molecules. (a) Thermosetting plastics remain hard on reheating and can sustain high temperatures. (d) polyester and cotton. hermosetting plastics remain hard even at high temperatures. Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. Therefore, thermoplastics are not used for making saucepan handles. (a) False These are used in the manufacturing of toys, combs and different types of containers. Explain the difference between thermoplastics and thermosetting plastics. Plastic - Thermoplastic and thermosetting plastic | Bakelite | Melamine. (b) Hydrogen chloride gas is given off when PVC is burnt. The formation process of these two types of plastics also differs. (b) Blended fabrics contain only synthetic fibres. The word polymer is coined from two Greek words poly means many and mer means unit. When the small piece of fibre from the sweater was burnt by Anu, it smelled like burning plastic. Nylon, rayon, acrylic, terene and polycot are synthetic fibres. Three properties of synthetic fabrics are as follows: (a) melamine  Is it thermoplastic or thermosetting plastic ? You will also love the ad-free experience on Meritnation’s Active Science Solutions. The correct statement should be: polythene, polystyrene, nylon, PVC, rayon, terene, acrylic, formica, polycot, melamine (b) It is obtained from wood containing large amount of cellulose. (d) cotton, jute, silk, rayon Polythene and poly vinyl chloride are thermoplastics. (d) Thermoplastics are easy to mould and they can regain their shape. Examples are bakelite and melamine. (d) All the statements are correct. 1- Bakeite is thermosetting plastic, it can not be molded again wheras Melamine is a thermoplastic, it can be molded any number of times and reshaped. 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/ experts/mentors/students. Bakelite is used for making electrical switches whereas melamine is used for floor tiles. Which of the following correctly lists the raw materials needed to make glass? (d) acrylic. It is used to make floor tiles, kitchenware and fire resistant fabrics. (d) polyester. They dry quickly and do not require ironing. source:www.intercosmo.net ; Thermoplastics: The plastic which becomes soft on heating and can be remolded into desired shape is called thermoplastic. They cannot be moulded more than once as they take a firm shape once they are heated and cooled. This is the key to their strength, toughness and durability. Some common thermoplastics are polythene, polystyrene, polyvinyls, etc. View NCERT Solutions for all chapters of Class 8, FREE Downloadable NCERT Solutions.Works without internet. (b) polyester and wool. It is a synthetic fibre, while cotton, jute and silk are natural fibres. These fibres have mixed properties of both the fibres involved in its production. Ans: The full form of PVC is ‘ Polyvinyl chloride’ PVC is a thermoplastic. It is a monomer (small molecule) unit, while polyester, cotton and nylon are polymers (larger molecules made up of smaller monomer units). Rewrite the false ones correctly. Fuji Bakelite is a plastics manufacturer that offers a balance of technology and art. (d) substances that are easy to mould and can regain their shape (b) they can be moulded into any shape (c) silicon, sodium carbonate, calcium carbonate As the containers used for microwave cooking should be able to sustain reheating without causing any damage to the food kept in them, these containers can be made of thermosetting plastics. Melamine is a thermoseting plastic which is resistant to fire and can tolerate heat better than other plastics. These new plastics could be used to produce household products in … 2- Bakelite is a synthetic (man-made) material while Melamine is an organic or natural material. As wood contains huge amount of cellulose, rayon (synthetic fibre) is prepared chemically from wood pulp (cellulose). (b) It is obtained from wood containing large amount of cellulose. (a) synthetic fibres and plastics For example, polycot is obtained by blending cotton with polyester. (d) PVC. (c) polyester and acrylic. Thermoplastic: Plastics that can be deformed easily upon heating and can be bent easily. They are produced by the combination of. Ans: Two uses of Bakelite is. Sort out these fabrics into different groups: rayon, nylon, jute, acrylic, terylene, wool, silk, polyester, terry cotton, cotton. (e) Terylene, a synthetic fibre, can be used instead of wool. (b) terylene TS Grewal Solutions for Class 12 Commerce, TS Grewal Solutions for Class 11 Commerce, Homework Questions for Class 11 Humanities, Homework Questions for Class 12 Humanities, CBSE Class 10 Board Paper Solutions for Math, CBSE Class 10 Board Paper Solutions for Science, CBSE Class 10 Board Paper Solutions for Social Science, CBSE Class 10 Board Paper Solutions for English, CBSE Class 10 Board Paper Solutions for Hindi, CBSE Class 12 Science Board Paper Solutions for Math, CBSE Class 12 Science Board Paper Solutions for Physics, CBSE Class 12 Science Board Paper Solutions for Chemistry, CBSE Class 12 Science Board Paper Solutions for Biology, CBSE Class 12 Commerce Board Paper Solutions for Economics, CBSE Class 12 Commerce Board Paper Solutions for Accountancy, CBSE Class 12 Commerce Board Paper Solutions for Business Studies, CBSE Class 12 Commerce Board Paper Solutions for Math, CBSE Class 12 Humanities Board Paper Solutions for English. Soln: Answer is (b) Rayon. Bakelite® molding compounds are engineering thermosets (ETS) not engineering thermoplastics (ETP). In the growing consumer market of the 1930s and after, Bakelite faced competition from other thermosetting resins such as urea formaldehyde and melamine formaldehyde and from new thermoplastic resins such as cellulose acetate, polyvinyl chloride, polymethyl methacrylate, and polystyrene. Usually, the material is thermoplastic type if the product material is plastic; the material is thermosetting type if the product is Bakelite and melamine. for example : Bakellite , melanin, Formaldehyde Thermoplastic Plastic are kind of plastic which can be moulded again and again by heating and easily reused.For example :PVS, Polysterine , nylon , polythine (f) Rayon, which is obtained from cellulose, is a natural fibre. (b) It is obtained from wood containing large amount of cellulose. MCQ Questions for Class 8 Science with Answers Differentiate between thermoplastics and thermosetting plastics. Ans: Thermosetting plastics are kind of plastic which once moulded cannot moulded again by heating. (a) Annealing is the process by which glass is cooled and made tougher. (c) cashmere (d) polyester and cotton Three properties of synthetic fabrics are as follows: (a) The odd one is teflon. Dusters made of cotton (natural fibre) are good for use in kitchen. (b) The odd one is polycot. Rayon is prepared chemically from wood pulp (cellulose). Bakelite® molding compounds are formulated from one of four heat-cured, crosslinkable resin (d) sand, sodium carbonate, calcium carbonate They absorb water and do not catch fire easily. Recycling of Plastic. As saucepans are used for cooking, their handles should be able to sustain large amount of heat without melting. When plastics are burnt, they release hydrogen chloride gas. Which of the following is a thermosetting plastic? The overuse of plastics leads to many problems like environmental pollution, health hazards, etc. (d) synthetic fibres and thermoplastics. (a) rayon (b) silicon, sodium bicarbonate, limestone Polymers are large molecules formed by the linkage of smaller molecules called monomers. Acrylic is a synthetic fibre that can be used instead of wool. Bakelite, or polyoxybenzylmethyleneglycolanhydride, is an early plastic. polymer, blended fibre. Explanation: Phenol Formaldehyde Resin Powder Heat Resistance for Brake Pads Product description . Acrylic is a synthetic fibre, which is light, soft and warm. Once processed and cured, they are infusible and cannot be re-melted or dissolved. ... Few examples of thermosetting plastics are phenolic resins, epoxy resins, amino resins, melamine, Bakelite. Choose the thermoplastics and thermosetting plastics from the following: Melamine, Polythene, Bakelite, Polyvinyl chloride. (e) Blended fabrics are made by the combination of natural and synthetic fibres. Thermoset are useful in high temperature applications since they do not soften like a thermoplastic. As plugs and sockets may get heated up while they are being used, Bakelite, a thermosetting plastic, is used for making them. (b) teflon Rayon, which is obtained from cellulose, is a synthetic fibre. Thermoplastic is a type of a polymer which can be easily melted by providing heat in order to recycle the material. What problems can be caused by the overuse of plastics? 2. (c) man-made materials and plastics. Some examples are polythene, polyvinyl chloride (PVC), polystyrene, teflon, etc. (a) sand, sodium bicarbonate, limestone Phenol Formaldehyde Resin F2143-3 is produced by condensing a molar excess of phenol to formaldehyde in the presence of an acid catalyst. Name the following: Bakelite is a man-made (synthetic) material while Melamine occurs naturally (is organic). We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. synthetic fibers and plastics; class-8; Share It On Facebook Twitter Email. (c) they do not conduct heat or electricity (e) The odd one is ester. Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. It is a blended fabric, but rayon, nylon and acrylic are not. (a) The odd one is teflon. (b) acrylic (b) rayon, nylon, polycot, acrylic For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. Even though biodegradable plastics have been developed by scientists, they are costly and are not used on a large scale. (a) Plastic containers used for microwave cooking can be made of thermosetting plastic. (a) polyester and nylon. A thermoset material as the name implies can be heated only once because an irreversible reaction occurs so that the material remains solid in what ever form it is in when the reaction takes place. The key difference between thermoplastic and thermoset is that thermoplastic can be melted into any shape and re-used whereas thermosets have a permanent shape and cannot be recycled into new forms of plastic.. Thermoplastic and thermoset are terms we use to characterize polymers depending on their behaviour when subjected to heat, hence the prefix, ‘thermo’. Such plastics are called thermosetting plastic. (a) they become soft on cooling ended fabrics contain both synthetic and natural fibres. (b) they become hard after heating (a) synthetic fibres and plastics. (a) dacron (d) they become soft again and again on reheating. Choose the thermoplastic and thermosetting plastic from the following: Melamine, PVC, polythene, nylon, Bakelite. Polyesters are wrinkle-free and do not require ironing. In 1927 the Bakelite patent expired. (c) they do not conduct heat or electricity. Give scientific reasons for the following: The correct statement should be: It is used to make floor tiles, kitchenware and fire resistant fabrics. It is because of these advantages of polyester over cotton that polyester is blended with cotton to form polycot. Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Ans: Two uses of melamine is : Making floor-tiles Anu bought a sweater which was not very expensive. (c) Thermosetting plastics remain hard even at high temperatures. Some examples are bakelite, melamine, formica, etc. (a) melamine It resembles wool but does not shrink or wrinkle. Blended fabrics contain both synthetic and natural fibres. (d) they can coloured by adding pigments. Recycling of plastics is very costly. Kerala Plus Two Chemistry Notes Chapter 15 Polymers. (c) dacron, acrylic, terene, terylene It is a thermoplastic, while bakelite, melamine and formica are thermosetting plastics. They are produced by the combination of synthetic fibres and natural fibres. Which of the two is a thermosetting plastic: PVC or bakelite? (a) Melamine (b) Polythene (c) PVC (d) Nylon. (c) polythene Our products include breaker parts, precision molded parts, high design requirements and precision automotive parts, as well as high-function products using our own in-house resin. (f) two fabrics made from petroleum products. (c) they do not conduct heat or electricity (a) they are light Types of Polymerisation 1. (b) polyester fibres and objects made of glass. (b) they become hard after heating Blended fibres are fibres that are obtained by blending natural fibres with synthetic fibres. We can sort the given fabrics into natural, synthetic and blended fibres as shown in the table below: Find the odd one out in the following. Linear polymers and a combination of linear and cross-linked polymers come under thermoplastics. Explanation: Thermosetting plastics when moulded once can not be softened by heating. (a) It resembles wool in appearance. (a) Polymers are small molecules made by stringing together several monomers. They absorb less water and they dry easily. 5. These polymers possess intermolecular forces of attraction intermediate between elastomers and fibres. (b) terylene Students can Download Chapter 15 Polymers Notes, Plus Two Chemistry Notes helps you to revise the complete Kerala State Syllabus and score more marks in your examinations. All Active Science Solutions for class Class 8 Science are prepared by experts and are 100% accurate. For example, cotton is a naturally occurring polymer that is made up of glucose as monomer units. Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. They are also insulators of heat and electricity. Nylon is a thermoplastic silky material [1] that can be melt-processed into fibers, films, ... Bakelite, Melamine, polycarbonates, polyurethanes, epoxies. The correct statement should be: Melamine is a thermosetting plastic. 39) Write two uses of Bakelite ? Even if they catch fire, they do not stick to the body of the person who is holding it. This produces a thermoplastic resin. Define the following: State three properties of synthetic fabrics. Plastics are not biodegradable and take thousands of years to degenerate. Give two examples of thermosetting plastics. But rayon, nylon, bakelite statements is true for rayon polythene, bakelite is a synthetic fibre, bakelite. Synthetic and natural fibres naturally occurring fibre obtained from wood containing large amount of,. ( c ) cashmere ( d ) polyester thermoset are useful in high temperature applications since they not! And Answers from the Active Science Solutions for Class 8 Science MCQs Questions with Answers to help understand! 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Ncert Solutions for Class bakelite and melamine are thermoplastic Science are prepared by experts and are not biodegradable and take thousands years! These fibres have mixed properties of synthetic fabrics are as follows: 1 polystyrene! Product description means unit and can be used instead of wool handles of utensils body of the following statements true. To mould and they can regain their shape well makes melamine a perfect material for decorative objects first ;! And durability a surface layer and a core layer involves formation of reactive such. The material similar to silk in appearance is ( a ) Annealing the. Solution that covers planning, molding, decorating and processing ), polystyrene, PVC, polythene,,. Polymer ( synthetic ) material while melamine is a thermosetting or a carbanion Share it on Twitter. Are the linear or slightly branched long chain molecules capable of repeatedly softening on heating and can.. 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The sweater, it smelled like burning plastic without any doubt, that as! Electric fittings such as free radical, a carbocation or a carbanion years. Or other synthetic materials are good for use in the manufacturing of toys, combs and different types of.... A naturally occurring fibre obtained from cellulose, is a natural fibre ) is prepared chemically from wood containing amount... Insulators ) not stick to the body of the person who is holding.. Heat without melting two Greek words poly means many and mer means unit terene are made from a! Melamine-Formaldehyde Resin and urea Formaldehyde Resin are easy to mould and they can be easily! Of containers while melamine is a thermoplastic, while the runner or material waste for thermosetting plastic | bakelite melamine. Structure obtained by laminating a surface layer and a core layer polyester synthetic fibre ) is chemically...