(e) Blended fabrics are made by the combination of natural and synthetic fibres. It is used to make floor tiles, kitchenware and fire resistant fabrics. (c) cashmere hermosetting plastics remain hard even at high temperatures. (e) Terylene, a synthetic fibre, can be used instead of wool. Bakelite is a very poor conductor of heat and electricity and it is used for making electrical switches. They absorb very less water. As plugs and sockets may get heated up while they are being used, Bakelite, a thermosetting plastic, is used for making them. Thermoset are useful in high temperature applications since they do not soften like a thermoplastic. Like bakelite and Perspex, the objects made of melamine can have polished and shiny surfaces which can be achieved by molding or treating objects with very fine abrasives. (b) teflon (c) they can be repeatedly remoulded into desired shapes Nylon, rayon, acrylic, terene and polycot are synthetic fibres. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. Rewrite the false ones correctly. (b) Blended fabrics contain only synthetic fibres. It is not a polyester synthetic fibre, while dacron, terene and terylene are polyester synthetic fibres that are manufactured from petroleum products. (b) acrylic Acrylic is a synthetic fibre, which is light, soft and warm. The plastics which gets deformed easily on heating and can be bent easily are called thermoplastics. Ans: Two uses of melamine is : Making floor-tiles (f) Polyester fibres like dacron and terene are made from petroleum products. 3. Are these statements true or false? (d) polyester and cotton. 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. (c) Bakelite is used to make plugs and sockets. Three properties of synthetic fabrics are as follows: Explain the difference between thermoplastics and thermosetting plastics. Which of the following is a polyester fibre? (b) they become hard after heating Ans: Thermosetting plastics are kind of plastic which once moulded cannot moulded again by heating. Synthetic condensation polymers have a wide array of household, industrial, commercial, and medical uses … 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. For example, polythene and PVC are thermoplastics. Dusters made of cotton (natural fibre) are good for use in kitchen. 5. Name the following: Blended fibres are fibres that are obtained by blending natural fibres with synthetic fibres. It is a thermoplastic, while bakelite, melamine and formica are thermosetting plastics. (c) polyester and acrylic. It is usually elastic and soft. It is used to make floor tiles, kitchenware and fire resistant fabrics. Explanation: Linear polymers and a combination of linear and cross-linked polymers come under thermoplastics. 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. 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Bakelite® molding compounds are formulated from one of four heat-cured, crosslinkable resin Give scientific reasons for the following: (a) they become soft on cooling (b) they can be moulded into any shape Rayon is prepared chemically from wood pulp (cellulose). Thus, the sweater was not pure wool, but it was made of synthetic acrylic fibre. (a) Annealing is the process by which glass is cooled and made tougher. (d) polyester and cotton These polymers possess intermolecular forces of attraction intermediate between elastomers and fibres. Which of the following is a thermosetting plastic? Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. (b) It is obtained from wood containing large amount of cellulose. Some examples are polythene, polyvinyl chloride (PVC), polystyrene, teflon, etc. (c) Polymers are large molecules made by joining many small molecules. Plastics are bad conductors of heat and electricity (good insulators). Ans: The full form of PVC is ‘ Polyvinyl chloride’ PVC is a thermoplastic. (f) Rayon, which is obtained from cellulose, is a natural fibre. source:www.intercosmo.net ; Thermoplastics: The plastic which becomes soft on heating and can be remolded into desired shape is called thermoplastic. Usually, the material is thermoplastic type if the product material is plastic; the material is thermosetting type if the product is Bakelite and melamine. Some common thermoplastics are polythene, polystyrene, polyvinyls, etc. This produces a thermoplastic resin. (d) they become soft again and again on reheating. (c) Dusters made of nylon or other synthetic materials are good for use in the kitchen. (d) All the statements are correct. The correct statement should be: Hence, they are used to cover electrical cables. (b) rayon, nylon, polycot, acrylic They dry quickly and do not require ironing. Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. For example, cotton is a naturally occurring polymer that is made up of glucose as monomer units. 2. Such plastics are called thermosetting plastic. Thermoplastic is used for making combs, toys, buckets, mugs, etc. Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. What are thermosetting plastics? (a) bakelite, teflon, formica, melamine The plastics which when moulded once, cannot be softened by heating are called thermosetting plastics. What problems can be caused by the overuse of plastics? (f) two fabrics made from petroleum products. All questions and answers from the Active Science Book of Class 8 Science Chapter 3 are provided here for you for free. As saucepans are used for cooking, their handles should be able to sustain large amount of heat without melting. Recycling of Plastic. 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 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. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. (a) Annealing is the process by which glass is cooled and made tougher. (a) dacron It is a thermoplastic, while bakelite, melamine and formica are thermosetting plastics. They absorb less water and they dry easily. polymer, blended fibre. (b) they become hard after heating 1. (c) The odd one is acrylic. Without any doubt, that quality as well makes melamine a perfect material for decorative objects. ended fabrics contain both synthetic and natural fibres. (a) Plastic containers used for microwave cooking can be made of thermosetting plastic. (d) substances that are easy to mould and can regain their shape 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’. 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. Melamine and Bakelite are thermosetting plastics. MCQ Questions for Class 8 Science with Answers 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. Sort out these fabrics into different groups: rayon, nylon, jute, acrylic, terylene, wool, silk, polyester, terry cotton, cotton. (c) silicon, sodium carbonate, calcium carbonate (c) dacron, acrylic, terene, terylene The correct statement should be: These fibres have mixed properties of both the fibres involved in its production. Once processed and cured, they are infusible and cannot be re-melted or dissolved. It is a blended fabric, but rayon, nylon and acrylic are not. (b) The odd one is polycot. (d) synthetic fibres and thermoplastics. At home, when she burnt a small piece of fibre from the sweater, it smelled like burning plastic. (c) they do not conduct heat or electricity (d) True polythene, polystyrene, nylon, PVC, rayon, terene, acrylic, formica, polycot, melamine (a) The odd one is teflon. giving reasons. 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. 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. 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. The word polymer is coined from two Greek words poly means many and mer means unit. The material similar to silk in appearance is (a) Nylon (b) Rayon (c) Polyester (d) Terylene. 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. It is because of these advantages of polyester over cotton that polyester is blended with cotton to form polycot. It resembles wool but does not shrink or wrinkle. (c) polythene Plastics are used to cover electrical cables because _____________. Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. For example, polycot is obtained by blending cotton with polyester. (d) sand, sodium carbonate, calcium carbonate Plastic - Thermoplastic and thermosetting plastic | Bakelite | Melamine. (b) The odd one is polycot. Bakelite® molding compounds are engineering thermosets (ETS) not engineering thermoplastics (ETP). (a) they are light (f) False Which of the following statements is true for rayon? Bakelite is a thermosetting plastic, it cannot be molded again whereas Melamine, being a thermoplastic, can be molded any number of times adn reshaped. (b) terylene Soln: Answer is (a) Melamine. Bakelite is a man-made (synthetic) material while Melamine occurs naturally (is organic). They are not infected by bacteria or fungus and are resistant to insects. As wood contains huge amount of cellulose, rayon (synthetic fibre) is prepared chemically from wood pulp (cellulose). (b) Thermoplastics become soft on heating. (e) The odd one is ester. Differentiate between thermoplastics and thermosetting plastics. This is the key to their strength, toughness and durability. Rayon looks like silk. Soln: Answer is (b) Rayon. 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. (a) polyester and nylon. These new plastics could be used to produce household products in … Plastics are not biodegradable and take thousands of years to degenerate. (b) It is obtained from wood containing large amount of cellulose. (b) Thermoplastics are not used for making saucepan handles. We provide a total manufacturing solution that covers planning, molding, decorating and processing. Types of Polymerisation 1. Bakelite is used for making electrical switches whereas melamine is used for floor tiles. (b) polyester and wool. (a) synthetic fibres and plastics Rayon, which is obtained from cellulose, is a synthetic fibre. Bakelite, or polyoxybenzylmethyleneglycolanhydride, is an early plastic. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. (c) It is a naturally occurring fibre obtained from wood. Polythene and poly vinyl chloride are thermoplastics. (b) acrylic Choose the thermoplastic and thermosetting plastic from the following: Melamine, PVC, polythene, nylon, Bakelite. synthetic fibers and plastics; class-8; Share It On Facebook Twitter Email. Making electric fittings such as electric switches, Making plugs and sockets. (b) Hydrogen chloride gas is given off when PVC is burnt. The correct statement should be: (c) nylon When plastics are burnt, they release hydrogen chloride gas. Melamine is a thermoseting plastic which is resistant to fire and can tolerate heat better than other plastics. It is a synthetic fibre, while cotton, jute and silk are natural fibres. Blended fabrics contain both synthetic and natural fibres. Three properties of synthetic fabrics are as follows: (a) The odd one is teflon. Chain Growth Polymerisation or Addition Polymerisation It involves formation of reactive intermediate such as free radical, a carbocation or a carbanion. Example: Bakelite, melamine, etc. (b) gas given off when PVC is burnt Ans: Two uses of Bakelite is. ... Few examples of thermosetting plastics are phenolic resins, epoxy resins, amino resins, melamine, Bakelite. All Active Science Solutions for class Class 8 Science are prepared by experts and are 100% accurate. 2- Bakelite is a synthetic (man-made) material while Melamine is an organic or natural material. (d) cotton, jute, silk, rayon Bakelite and melamine are examples of thermosetting plastic. The overuse of plastics leads to many problems like environmental pollution, health hazards, etc. ​Polymers are large molecules made by stringing together several monomers (small molecules). They are produced by the combination of synthetic fibres and natural fibres. (a) melamine Which of the following correctly lists the raw materials needed to make glass? (b) It is obtained from wood containing large amount of cellulose. (a) False 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. Is it thermoplastic or thermosetting plastic ? Acrylic is a synthetic fibre that can be used instead of wool. (d) sand, sodium carbonate, calcium carbonate. (c) they do not conduct heat or electricity (c) Thermosetting plastics remain hard even at high temperatures. (a) Thermosetting plastics remain hard on reheating and can sustain high temperatures. Melamine is a thermosetting plastic. Plastic is a very generalized term for polymers that can mean either a thermosetting or a thermoplastic Plastic. As plugs and sockets may get heated up while they are being used, Bakelite, a thermosetting plastic, is used for making them. (a) sand, sodium bicarbonate, limestone It is a thermoplastic, while bakelite, melamine and formica are thermosetting plastics. What is the sweater most likely made of? 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. (c) False Therefore, thermoplastics are not used for making saucepan handles. Even if they catch fire, they do not stick to the body of the person who is holding it. (d) Thermoplastics are easy to mould and they can regain their shape. It is used to make electrical switches and handles of utensils. The list of materials mentioned above can be classified as Active Science Solutions for Class 8 Science Chapter 3 Man Made Materials are provided here with simple step-by-step explanations. Polythene, polystyrene, PVC, melamine and formica are plastics. Recycling of plastics is very costly. 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. common thermosetting polymers are bakelite, melamine-formaldehyde resin and urea formaldehyde resin. (b) polyester fibres and objects made of glass. (a) It resembles wool in appearance. (a) melamine  These are used in the manufacturing of toys, combs and different types of containers. (c) large molecules made by joining many small molecules together Phenol Formaldehyde Resin Powder Heat Resistance for Brake Pads Product description . (a) synthetic fibres and plastics. Some examples are bakelite, melamine, formica, etc. They absorb water and do not catch fire easily. One characteristic of thermosets is that ___________. It is a blended fabric, but rayon, nylon and acrylic are not. They can be moulded into different shapes again and again. They are also insulators of heat and electricity. (d) The odd one is rayon. Thermoplastic type material can be recycled and reusable, while the runner or material waste for thermosetting plastic type cannot. It is a monomer (small molecule) unit, while polyester, cotton and nylon are polymers (larger molecules made up of smaller monomer units). Choose the thermoplastics and thermosetting plastics from the following: Melamine, Polythene, Bakelite, Polyvinyl chloride. Explanation: Thermosetting plastics when moulded once can not be softened by heating. The correct statement should be: Polythene and PVC are examples of thermoplastic. (d) Polyester fibres are obtained from petroleum products. 39) Write two uses of Bakelite ? (d) acrylic. They are also insulators of heat and electricity. State three properties of synthetic fabrics. The formation process of these two types of plastics also differs. Examples are bakelite and melamine. Kerala Plus Two Chemistry Notes Chapter 15 Polymers. They are produced by the combination of. In 1927 the Bakelite patent expired. Phenol Formaldehyde Resin F2143-3 is produced by condensing a molar excess of phenol to formaldehyde in the presence of an acid catalyst. (e) fabrics made by the combination of natural and synthetic fibres 1 Answer +1 vote . The correct statement should be: Fuji Bakelite is a plastics manufacturer that offers a balance of technology and art. Even though biodegradable plastics have been developed by scientists, they are costly and are not used on a large scale. It is used to make electrical switches and handles of utensils. Nylon is a thermoplastic silky material [1] that can be melt-processed into fibers, films, ... Bakelite, Melamine, polycarbonates, polyurethanes, epoxies. Which of the two is a thermosetting plastic: PVC or bakelite? Polymers are large molecules formed by the linkage of smaller molecules called monomers. (a) rayon (b) terylene (e) polyester, cotton, ester, nylon. (e) False Anu bought a sweater which was not very expensive. It is a polymer (synthetic fibre) made up of small chemical molecules called esters. 40) State two uses of melamine ? This results in environmental pollution. Thermosetting Plastic: Some plastics do not get deformed on heating, and cannot be re-molded into a new shape. Thermoplastic polymers These are the linear or slightly branched long chain molecules capable of repeatedly softening on heating and hardening on cooling. Give two examples of thermosetting plastics. (c) man-made materials and plastics. Sand (silicon dioxide (SiO2), sodium carbonate (Na2CO3) and calcium carbonate (CaCO3) are the three raw materials needed to make glass. (d) polyester. Polycot, a blended fibre is made from (d) PVC. When the small piece of fibre from the sweater was burnt by Anu, it smelled like burning plastic. They become soft only the first time; they become hard. Thermoplastic is a type of a polymer which can be easily melted by providing heat in order to recycle the material. 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. 3. View NCERT Solutions for all chapters of Class 8, FREE Downloadable NCERT Solutions.Works without internet. (d) they can coloured by adding pigments. (c) they do not conduct heat or electricity. 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. You will also love the ad-free experience on Meritnation’s Active Science Solutions. Thermosetting plastics become soft only the first time; when they are reheated, they become hard (take firm shape). 3- Bakelite is a synthetic plastic and Melamine is … (a) the process by which glass is cooled and made tougher Polyesters are wrinkle-free and do not require ironing. They cannot be moulded more than once as they take a firm shape once they are heated and cooled. (a) Melamine (b) Polythene (c) PVC (d) Nylon. (b) silicon, sodium bicarbonate, limestone (a) Polymers are small molecules made by stringing together several monomers. (b) False Thermoplastic: Plastics that can be deformed easily upon heating and can be bent easily. Define the following: Choose the thermoplastics and thermosetting plastics from the following: Melamine, Polythene, Bakelite, Polyvinyl chloride. Pvc is burnt: melamine, polythene, bakelite Resin Powder heat Resistance Brake! A balance of technology and art attraction intermediate between elastomers and fibres not to! 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