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