Short Answer Type Questions Melamine is (a) thermoplastic polymer (b) thermosetting polymer (c) fibre (d) elastomer. Which is a thermosetting plastic? a) Saucepan handles. The articles mades of plastics are non-biodegradable. Wood, paper, woolen clothes, aluminum can 3. The burning of plastic wastes gives out harmful gases which pollute the air. Question. 6 The most suitable material for the preparation of handles of cooking utensils is (a) polythene (b) PVC Refuse (avoid) is the best way to manage plastic. Disadvantages of Melamine Cabinets. Examples are bakelite and melamine. Melamine is … (a) paper (b) woollen clothes Question. Long Answer Type Questions (b) Thermoplastics become soft on heating. They tend to char and burn when heated, but they are resistant to much higher temperatures than thermosoftening plastics. But it is advised to avoid the use of plastic as far as possible. The shopkeeper showed her blankets made up of acrylic fibres as well as made up of wool. Answer. c) Acrilon is pure wool obtained from sheep. The molder can remove the part from the mold before it cools. When first heated to a certain temperature, the plastic can soften, flow and undergo a chemical reaction. If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices. Much more weight is required to break the nylon thread showing that nylon thread has a grater strength that the cotton thread. III. (a) Cotton (b) Nylon (c)Jute (d)Wool Question. ? Melamine formaldehyde is a thermosetting plastic and cannot be melted. (d) melamine. Answer. What is its chemical name? Plastic containers seem most convenient. Question. Answer. Melamine, which is used for kitchen surfaces, is an example of a thermosetting plastic (sometimes called a thermoset A thermoset plastic is heat resistant because of extensive cross-linking between its molecules by strong covalent bonds. Answer: True. Melamine resin or melamine formaldehyde (also shortened to melamine) is a resin with melamine rings terminated with multiple hydroxyl groups derived from formaldehyde.This thermosetting plastic material is made from melamine and formaldehyde. Soln: Answer is (b) Rayon d) Bakelite is a thermoplastics plastics. Which is a thermosetting plastic? She preferred to buy an acrylic blanket. (e) Yespolter (f) Felton (b) Light in weight ? Prior to curing, the reinforcement substrate is dipped into the resin binder in its liquified form. Question. A) true B) false 17. TRUE ? The correct matching is as given: ? This material is called thermosetting plastic. 4. (b) Woollen clothes (c) nylon and cotton (d) polyester and cotton (4) (c) Relyteen (d) Laspict 1. Across Answer. (d) Acrylic, silk, wool Such a material is also known as a thermoset or thermosetting polymer. It is advised to restrict the use of plastic because of the following reasons: Question. Thermosetting plastics are normally made up of lines of polymers which are highly cross-linked. Substance made up of large number of smaller molecules. (c) Nylon —-> Fibre , PVC —->Thermoplastic , Bakelite —->Thermosetting plastic. (b) Rayon resembles silk in appearance, therefore, rayon is also called artificial silk. Question 2. 10. TRUE ? 25 State whether the following statements are True/False. Thermoplastics —–>Polythene and PVC ‘ with reinforcement base materials such as glass, linen and graphite. (5) (a) Wool (b) PET (c) Wood pulp (d) Silk Answer. (d) Aluminium can Question. The raw material to make plastic is oil. TRUE ? Rayon is often regarded as artificial silk. (a) Thermosetting plastics remain hard on reheating and can sustain high temperatures. 11 Cotton is a natural polymer. Nylon ropes are strongfelastic and lighter as compared to cotton and jute ropes. Question. 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Question. (a) Melamine is a thermosetting plastic which when moulded once, cannot be softened by heating. (c) teflon (d) PET Thermosetting plastics do not melt when heated. Question. (d) PET is ‘poly-ethylene’ terephthalate’ PET as a plastic is very light weight and is commonly used for making kitchen containers. FALSE; HDPE is a tough plastic used for making toys. A synthetic fibre classified as polyester. Another way to prevent getting this page in the future is to use Privacy Pass. (b) Electric plugs/ switches/ plug boards are saucepan is made of thermosetting plastic because it is a bad conductor of electricity. (a)—(iii), (b)—(iv), (c)—(v), (d)—(ii), (e)-(i), Question. Plastics It is used to store food item, water, milk, pickles, dry food, etc. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Rayon is obtained by the chemical treatment of wool pulp (which contains cellulose). A plastic used for making containers and carry bags. Thermosetting Plastics:There are some plastics which when moulded once cannot be softened by heating. 10 The material which is commonly used for making kitchen containers is False, most of the plastics are non-biodegradable. Question. The material similar to silk in appearance is ... Indicate whether the following statements are True or False. Answer. They do not decompose (or rot) easily. Burning of plastics and synthetic fabrics produces lots of poisonous gases causing air pollution. Is melamine plastic? Answer. Acrylic It is used for sweaters, track suits, linings for boots and gloves and In furnishing fabrics and carpets. 3 Polycot is obtained by mixing Question. 18 A bucket made of plastic does not rust like a bucket made up of iron. Your IP: 138.201.32.27 Why? Acrylic blankets are cheap, light in weight, more durable and are available in variety of colours and designs. A thermosetting plastic is a polymer that irreversibly becomes rigid when heated. (i) The fabric terywool is obtained by mixing terylene and wool. Box Quantity: 48. 2 Which of the following is a source of rayon? 12 A synthetic fibre which looks like silk is obtained by chemical treatment of wood pulp. MEDIUM 17 Select the articles from the following list which are biodegradable. (8) 6. note the total weight required to break the cotton thread. (7) Write the names of the fibres. (a) Rayon (b) Polymer (e) Plastic bag Performance & security by Cloudflare, Please complete the security check to access. (9) 13 Terrycot is made by mixing two types of fibres. It is used for making floor tiles, kitchenware and fabrics which resist fire. Answer. (7) Answer. The resin of thermosetting plastic is linear or with branched chain, after curing, 5 The material similar to silk in appearance is … 5 The material similar to silk in appearance is FALSE; Epoxy resin is a thermoplastic? Electrical insulator and tableware. Answer. 9 Which of the following groups contains all synthetic substances? Answer: True. • Initially, the polymer is a liquid or soft solid. Answer. PVC, melamine, polythene, natural ru bber 2. Answer: (False) Correct statement: It is good to wear clothes made of fibres while cooking. (c) polyester (d) terylene Multiple Choice Questions Hang cotton, thread from a stand. FALSE; Plastic is suitable for building large and heavy structures. (d) (a)-(iii), (b)-(ii), (c)-(i) (a) (a)-(ii), (b)-(iii), (c)-(i) (a) nylon and wool (b) polyester and wool Also write the false statements in their correct form. The reaction used to produce thermosetting plastic products involve a chemical interaction between specialized materials. Melamine is a strong, lightweight and hard, thermosetting plastic which is an ideal hygienic and durable alternative to china. (a) Melamine (c) PVC (b) Polythene (d) Nylon . (d) Plastics are non-reactive, light in weight and durable but they do not conduct electricity. Can you write the major difference between these two types of plastics? (c) Terylene (d) Plastic Question. 20 A lady went to the market to buy a blanket. (a) Melamine (b) Polythene – Question. A nylon thread is actually stronger than a steel wire of similar thickness. State, whether the following statements are True or False. It is made from melamine and formaldehyde by condensation of the two monomers. Answer. This gives a measure of the tensile strength of the thread. Silk, jute, Nylon, wool 4. It is good to wear clothes made of synthetic fibres while cooking. 29 Crossword Puzzle Complete the crossword given below with the help of clues. Thermosets are a type of plastic that are melted down to liquid, then allowed to reform into a solid, but cannot be melted again once hardened. Thermosetting polymer composites are made using a laminating process, which binds together resins such as epoxy, silicone, melamine, etc. Question. 28 Write an activity to show that synthetic fibres are stronger than the cotton fibres. State whether the given statement is true or false. Question. Heat provides energy for chemical reactions that increase the cross-linking Why? Another name for this compound is artificial silk. (a) Paper words given below, related to synthetic • This causes a great problem in the disposal of plastic wastes. Answer. Question 4. Cloudflare Ray ID: 6076c08d7e3f1f95 The chemical formula for melamine formaldehyde is C4H6N6O. 7. (d) Good conductor of electricity (d) Bakelite is used for making the handles of various cooking utensils because it is a poor conductor of heat and does not become soft on getting heated. Plastic is non-reactive material. (c) Durable For this reason, thermoset materials are typically considered to be non-recyclables. It is prepared from coal, water and air. Short Answer Questions: Why should we not use plastics? (a) Melamine is a thermosetting plastic which when moulded once, cannot be softened by heating. Thermosetting plastics —–> Bakelite and melamine, Question. 4. (b) Nylon Is a synthetic fibre. Question. (5) The heavily cross-linked structure produced by chemical bonds in thermoset materials is directly responsible for the high mechanical and physical strength compared with thermoplastics or elastomers. However its most common use is to combine it with formaldehyde, to create a melamine resin which is a type of plastic. A lot of plastic pollutes our environment. Answer 4 (a) Question 5. Name two thermosetting plastic items. Activity Take threads of cotton and nylon (synthetic fibres) of about same length and thickness.. Polycot = polyester + cotton. The disposal of plastic waste is a major problem because plastic is non-biodegradable, it takes.several years to decompose. As a result, there is a risk of melamine and formaldehyde discharge into foods prepared or stored in melamine-containing dishes, bowls, and other products in the home. It is, therefore, known as artificial silk. Answer. 15 Plastic is used for making a large variety of articles of daily use and these articles are very attractive. Answer. Conclusion 16. 3. Answer. Soln: Answer is (a) Melamine. (a) Non-reactive Technically, melamine is a white crystalline chemical which is not the same thing as plastic. (c) wood (f) peels of vegetables. A) PVC B) Polythene C) Bakelite D) None of these 19. The importance of synthetic polymers in our life are as follows: Question. is a good conductor of plastics. Question. Melamine plastics degrade and release chemical constituents upon heating to temperatures utilized for cooking in ovens and microwaves, as well as upon exposure to acidic foodstuffs. TRUE ? Why do we use melamine for making kitchenware? Silk 6. Answer. Polycot, Polywool, Terrycot ,Acrylic State whether the given statements are true or false… Question. Please enable Cookies and reload the page. 27 Despite being very useful, it is advised to restrict the use of plastic. Codes Question. Which synthetic fibre is called synthetic silk? 1 Pick the synthetic fibre out of the following. Melamine crockery is a thermoset plastic resin made from organic compounds. Answer. Question. A type of fibre obtained naturally from cocoon. (f) Peels of vegetables Answer. Write True or False against the following statements: a) Polyester shrinks on washing. Melamine resin or melamine formaldehyde (also shortened to melamine) is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization. Chemical name of natural polymer of cotton is cellulose. Choose the correct answer: Example of thermosetting plastic is . A thermosetting polymer, resin, or plastic, often called a thermoset, is a polymer that is irreversibly hardened by curing from a soft solid or viscous liquid prepolymer or resin. 16 Why is it not advisable to burn plastic and synthetic fabrics? NCERT Exemplar Class 8 Science Chapter 3 Synthetic Fibres and Plasticst are part of NCERT Exemplar Class 8 Science. Nylon It is used for making ropes for rock climbing, fishing nets, raincoats, parachutes and tyre cords, etc. So, we should avoid use of plastics, as for as possible. View Answer. It is also mixed with natural fibre like cotton and wool to make more variety of clothes. Answer. (b) (a)-(iii), (b)-(i), (c)-(ii) 26 Write the importance of synthetic polymers in our life. 11. Why is it so? Statement: The articles made of thermoplastics can be recycled whereas the articles made of thermosetting plastics cannot be recycled. 4. Write full forms of: a) P.V.C. Plastics can be easily moulded, so they are used to make a large variety of articles (or objects) having different shapes and sizes. NCERT Exemplar SolutionsNCERT Exemplar MathsNCERT Exemplar Science. 4 Which is a thermosetting plastic? (c) Wool pulp These dinner plates by Carlisle feature a white body with a multi-coloured mosaic effect around the rim; they are perfect for meeting the tough demands of everyday use in schools, hospitals and care homes. Answer. (a) Anory (b) Lopmery Answer. (c) PVC, polythene and bakelite are synthetic substances. A) true B) false 18. The material similar to silk in appearance is (a) Nylon (c) Polyester ... Indicate whether the following statements are True or False. Can you suggest some methods to limit its consumption? Its physical properties and appearance has made it a popular material for manufacturing hard wearing products across a number of industries. (a) Melamine (b) Polythene (c) PVC (d) Nylon. Answer. Bakelite is used for making electrical switches, handles of various utensils etc. 19 Rohit took with him some nylon ropes, when he was going for rock climbing. (c) nylon (d) bakelite Acrylic, polyethylene and polystyrene are thermoplastic. Question. (a) nylon (b) rayon A polymer used for making ropes. 9. It resists fire and can tolerate heat better than other plastics. (a) Melamine (c) PVC (b) Polythene (d) Nylon 5. State True or False: Thermoplastics are hard and brittle. (c) PVC, polythene, bakelite 7 Which of the following is not a common property of plastics? 14 Plastic articles are available in all possible shapes and sizes. Rayon 7.Which raw material is used to make nylon? Weight: Melamine is a heavy material, especially when compared to wood, which makes the installation process much more labor intensive and lengthy. Thus, cause environmental pollution. Terrycot is made by mixing terylene and cotton. Question. It is white, tasteless, odourless and exhibits great chemical and heat resistance. FALSE; PVC is a thermoplastic. The material similar to silk in appearance is (a) Nylon (b) Rayon (c) Polyester (d) Terylene. Add weights, one by one, to the pan until the thread breaks (see fig.) Thermoplastics get deformed easily on heating and can be bent easily on heating. Attach a pan at the other end of the thread. Question 3. Cotton, jute and wool are natural fibres. This results in increased installation costs, which may affect a homeowner's ability to afford these types of kitchen cabinets. (d) Polycot is obtained by mixing polyester and cotton. 23 Match items in Column A with the terms of Column B. True or False : Question 1. What is its common name? They can be easily washed at home. Teflon (b) Electric switches (c) Pa rachutes (d) Polyester (e) Artificial silk The odd one out. Once cured, the plastic will become hard. Answer: Melamine is a versatile material. You may need to download version 2.0 now from the Chrome Web Store. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. So, it is not advisable to burn plastic and synthetic fibres. Down Question. It is made without using any natural raw material. We hope the NCERT Exemplar Class 8 Science Chapter 3 Synthetic Fibres and Plastics help you. True, a disadvantage as synthetic fibre is that they melt on heating. Therefore among consumer uses, when people say “melamine” they are referring to the plastic made with it. Can you guess why? (e) Polyester (f) Teflon. 5. 5. Also write the false statements in their correct form. Can you tell why he selected nylon ropes instead of ropes made up of cotton or jute? On the other hand, thermosetting plastics when moulded once cannot be softened on heating. Name one natural fibre. So, it is not advisable to dispose of the used plastic articles by burning. Can you tell why? Substance used as synthetic wool. While p olyethylene is a thermoplastic polymer consisting of long hydrocarbon chains, PVC or Polyvinyl chloride , is also a thermoplastic produced by polymerization of vinyl chloride monomer (VCM) and nylon belongs to a … If you have any query regarding NCERT Exemplar Class 8 Science Chapter 3 Synthetic Fibres and Plastics, drop a comment below and we will get back to you at the earliest. 2. The biodegradable articles are: Curing is induced by heat or suitable radiation and may be promoted by high pressure, or mixing with a catalyst.Heat is not necessarily to be applied externally. Here we have given NCERT Exemplar Class 8 Science Chapter 3 Synthetic Fibres and Plastics. b) Plastics are not affected by heat. Melamine-Formaldehyde Resins Properties. Answer. Answer. e) P.V.C. Melamine plastic, also known as melamine formaldehyde, is a hard, thermosetting plastic material made from melamine and formaldehyde. Thermoset plastic products are typically produced by heating liquid or powder within a mold and allowing the material to cure into its hardened form. This characteristic is used to shape and process plastics and then solidify into products of definite shape and size. Thermosetting plastics 5. State True or False: Thermoplastic can be softened on heating and moulded repeatedly. (a) PVC (b) acrylic ? Answer. These are called thermosetting plastics e.g., bakelite and melamine. TRUE ? Answer (d) melamine Melamine is not thermoplastics, it is thermosetting plastic. Answer: (b) thermosetting polymer 24 Unscramble the jumbled materials. Whether a saucepan can be used in an oven usually depends on the type of material from which the pan's handles are made. When left exposed to moisture and air, it does not react with air and water which are essential for corrosion, therefore does not rust. Question. Repeat the same with nylon thread. Answer. 8 Which of the following represents the correct match for items in Column A with those in Column B. (c) PVC (d) Nylon Explanation: Thermosetting plastics when moulded once can not be softened by heating. 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. Which is a thermosetting plastic? Terylene It is used in textile industry to make clothes like sarees, tapestry and dress material. 21 PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. (c) (a)-(ii), (b)-(i), (c)-(iii) NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12. (b) Cotton, polycot, rayon (c) Wood Melamine formaldehyde (also called melamine or MF) is a hard, very durable, and versatile thermosetting aminoplast 1 with good fire and heat resistance. Very Short Answer Type Questions Answer. Question. (a) Nylon, tprylene, wool Its common name is rayon. 1. If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. ? Strength of the two monomers some methods to limit its consumption various etc. Thermoplastic and is used for making a large variety of clothes higher temperatures than plastics! Linen and graphite heavy structures of clothes stronger than a steel wire of similar thickness more... The terms of Column b and cotton a thermoplastic and is used to food... Odourless and exhibits great chemical and heat resistance alternative to china ru 2... Increased installation costs, which may affect a homeowner 's ability to afford these types plastics... Versatile material Rayon 7.Which raw material is also mixed with natural fibre like and! Mixing two types of kitchen Cabinets mold and allowing the material similar silk... 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