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. Thermosets usually are three-dimensional networked polymers in which there is a high degree of cross-linking between polymer chains. A) true B) false 20. 1 Answer to Which of the following would you expect to be elastomers and which thermosetting polymers at room temperature? PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Decide whether the following statements about thermosetting plastics are true or false. 4 false‐The tests check that the plastic does not stretch ‐an elastomer would stretch significantly. PVC can be made either as a flexible plastic or a rigid plastic by means of additives. Nylon is also used for making parachutes and ropes for rock climbing. Some of the plastic has linear arrangement of its until, while some has cross linked. Examples are bakelite and melamine. True. cure. Which of the following is a thermosetting plastic: (a) PVC (b) nylon (c) teflon (d) bakelite. True. Bloomberg planning to double plastic, all recycling in New York City. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. T/F- PVC Sch. (D) examples of heavy fibers. b. b. Question 4. Polythene, polystyrene, PVC, melamine and formica are plastics. Such a material is also known as a thermoset or thermosetting polymer. True b. (a) Melamine (b) Polythene – (c) PVC (d) Nylon Answer. Thermoplastics are 100% recyclable. A. PVC. True . Answer. Polyester is the strongest synthetic fibre. Question 13. 4) PVC is a thermoplastic. Telephone instruments, cooker handles, ball point pens, electrical switches. 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. Answer: (a) melamine Melamine is a thermosetting plastic. PVC (polyvinylchloride) -a cheaper plastic used for window frames and pipes. Plastic Bags: Cook wares: Teflon: Thermosetting: Answer. PVC is polyvinyl chloride and it is a type of vinyl polymer. False. An excellent example is polyurethane foam. True b. Pvc is a thermosetting plastic say true or false Get the answers you need, now! Which one of the following is an example of a biode-gradable polyester (a) PHBV (b) PET (c) Nylon (d) Bakelite Answer: (a) PHBV. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. It is used to make many items like socks, ropes, tents, toothbrushes, car seat belts, sleeping bags, curtains etc. 22. False. Recyclability of PVC waste can be achieved mechanically without modifications or use of new plasticizer since the separation of other mixed plastics is possible through triboelectrostatic technology [50, 52]. Also, bakelite is a poor conductor of electricity, hence, it protects us from getting electric shocks. False. All Plastics, Thermoplastic Or Thermoset, Will Degrade At Some Temperature? PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. 1M 4. Curing is induced by heat or suitable radiation and may be promoted by high pressure, or mixing with a catalyst. 2. Examples: Nylon, PVC, polystyrene, etc. a. Answer 21. Question 19. Question 7. Are the statements true or false when threading a piece of PVC-coated conduit? Answer (b) non-corrosive Food items are stored in plastic containers because they are non-corrosive. What is Acrylonitrile Butadiene Styrene (ABS)? ? Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. Which of the following does not have cross linked arrangement: (A) Bakelite. The cross-linking restricts the motion of the chains and leads to a rigid material. 7. True. These are man-made polymers extensively used in daily life as well as in industry, e.g. MINERALS AND THEIR SIGNIFICANCE TO A HUMAN BODY, SCIENTIFIC INSTRUMENTS AND WHAT THEY MEASURE, THE LIVING ORGANISMS AND THEIR SURROUNDINGS, WEATHER, CLIMATE AND ADAPTATIONS OF ANIMALS, LIST OF PRESIDENTS,PRIME MINISTER & CHIEF JUSTICES, DIFFERENT TYPE OF BANKING TRANSACTION CARDS, NUMBER OF PLAYERS IN SPORTS AND PLAYING AREA, ANIMAL, MALE, FEMALE, YOUNG ONE, NOUN AND SOUND. Thermoplastics are the polymers which loses their shape on heating and regain their shape on cooling. Flexible polyurethane foams are commonly shredded into small flakes and re-manufactured into carpet underpayment. Which plastic is used to laminate kitchen worktops? Question 21. Whereas, the others mentioned are thermoplastics that can be moulded on heating. 5) HDPE is a tough plastic used for making toys. There are multiple thermoplastic resins that offer various performance benefits, but most materials commonly offer high strength, shrink-resistance and easy bendability. a. Thermosetting Plastics: ... Q. False » Questions » Engineering » Civil Engineering » Civil Engineering - Others » EPDM is a thermosetting plastic. a. b. True or false? Answer: ... Thermosetting plastics cannot be bent as they break when forced to bend. Examples – B akelite and melamine. Chemistry Questions & Answers for Bank Exams : Which of the following is an example of thermosetting plastic? Examples of thermoset types include rubber insulations such as silicone rubbers and EVA (Ethylene-Vinyl Acetate). Synthetic fibres are also called ……... or …….. fibres. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Nylon is a thermoplastic polymer. 6. Plastics can be recycles, reused, colored melted, rolled into sheets or made into wires. Plastic Applications. Thermoplasticis a plastic which gets deformed easily on heating and can be bent easily e.g., Polythene and PVC. Thermoplastics become moldable above a specific temperature and then return back to a solid when cooled. plastic (polythene) 49. Bakelite is poor conductor of electricity. The main physical difference is how they respond to high temperatures. (B) examples of thermoplastics. In summary, thermo-softening plastics are soft and melt when heated, whereas thermosetting plastics are hard and do not soften or change their shape when heated. They can be melted again and again. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. less flexible but more fire resistant. Give the name of a plastic used for making fibres. Thermoplastics are 100% recyclable. Answer: True. Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. Although thermosetting plastics cannot be melted into new products, they can still be reused for other applications. Acrylic – Acrylic is commonly used for consumer goods. Explain why the following are made of thermosetting plastics: (a) Saucepan handles (b) Electric plugs/switches/plug boards 6. 3. PVC (Poly vinyl chloride) and Polythene are: (A) examples of thermosetting plastics. True Or False? Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. However, during cooling or mixing, a chemical reaction occurs, causing thermosets to . 3) Epoxy resin is a thermoplastic? Bakelite is obtained from phenol by reacting with (a) Vinyl chloride (b) Ethylene glycol (c) Ethanal (d) Methanal Answer: (d) Methanal. Question 6. Some other examples of thermosetting polymers include a substance used to make old TV sets and certain types of strong glue. 5. If subjected to extremely high temperatures, the material may unwantedly soften, deform, and … TRUE ? The lap seams in an EPDM roof membrane are typically sealed by. True False QUESTION 3 PVC is a commonly recycled plastic material. a. If re-heated they cannot soften as polymer chains are interlinked. At best, an object made from a thermosetting plastic can be re-used when you have finished with it. (C) PVC. ... EPDM is a thermosetting plastic. Rayon is mixed with cotton to make bedsheets or mixed with wool to make carpets. FALSE; HDPE is a tough plastic used for making toys. Answer: (D) Bakelite. Give an example of linear and branched chain polymer each. B) True 14. Answer: (False) Correct statement: It is good to wear clothes made of fibres while cooking. Page No 44: Question 4: Which of the following is a thermosetting plastic? B. Polythene. Thermosetting Plastics:There are some plastics which when … Thermosetting plastic molecules, on the other hand, form permanent chemical bonds or cross links with each other once heated. ? ? Heat is not necessarily to be applied externally. Acrylic is an artificial wool. (C) examples of natural substances. 21. Vinyl plastic and PVC are often the same thing. Bitumen-treated fiberglass felt. b. Question 5. 1. Fill in the blanks. This makes thermosetting plastics ideal for producing heat resistant products such as insulation parts, car parts, etc. They may also be mixed from cold ingredients. ? Play this game to review English. Reason: In thermosetting plastics, the polymeric chains are held together by strong covalent bonds. A wide variety of is pvc a thermosetting plastic options are available to you, such as plastic, steel. 22. Alibaba.com offers 571 is pvc a thermosetting plastic products. IV. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. State whether the statements given below are True or False: All fibres are made up of very large units which in turn are made up of many small units. True. Answer: True. Examples – Polythene and polyvinyl chloride(PVC) Thermosetting PlasticThe plastic which getsmoulded once, cannot besoftened on heating is called thermosetting plastic. Pencil or bevel cut the PVC coating at the end of the conduit. Thermosetting polymers solidify into a permanent design and shape. T/F- PVC fittings are made by the extrusion process in which plastic resins are heated, softened, and forced through a circular die, which forms the cylindrical pipe shape. Separate polymers are joined in order to form a huge polymer. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Question 40. To play this quiz, please finish editing it. Thermosetting plastics, also called . True. When you heat thermoplastics, the molecules do not chemically bond with each other. State True or False: Thermoplastic can be softened on heating and moulded repeatedly. Assertion: Bakelite is a thermosetting plastic. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc. Instead, thermoplastic chains are held together by van der waal forces, weak attractions between molecules. FALSE; Epoxy resin is a thermoplastic? 1M 5. (B) Melamine. Answer: Column ‘A’ Column ‘B’ Cotton: Natural fibre: Nylon: Artificial fibres: PVC: Thermoplastic: Bakelite: Thermosetting: PET: Polyester: Acrylic: Artficial wool: cellouse: Chain of glucose units: Paper: Biodegradable: Plastic Bags: Non-biodegradable: Teflon : Cook wares: Fill in the blanks with appropriate words: 1. Initially, the polymer is a liquid or soft solid. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc… Polyethylene – Polyethylene is a very common thermoplastic, and is often used to create plastic grocery bags or single-use plastic products like shampoo or water bottles. Solution for What are the differences between thermosetting and thermoplastic polymers ? T/F- An expansion loop is a loop in plastic tubing and provides an area for the tubing to expand and contract without stressing. Study 35 ET 241 Final Review flashcards from Ben B. on StudyBlue. 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. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Refuse (avoid) is the best way to manage plastic. Polyester fibres are used for making hand knit sweaters. False. Answer: Nylon. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Nylon fibres are strong elastic and light, lusturus and easy to wash. ? Which of two is thermosetting plastic—PVC or bakelite? B. Thermoplastics and thermosetting plastics . Answer: Polymers are compounds that are made up of … Heat provides energy for chemical reactions that increase the cross-linking between polymer chains, curing the plastic. Urea, Ammonia nitrate and ammonium sulphate are examples of: FALSE; Plastic is suitable for building large and heavy structures. Instead, thermoplastic chains are held together by van der waal forces, weak attractions between molecules. All the synthetic fibres are prepared using raw materials of petroleum origin called.............. . thermosets, can be heated and mouldedlike thermoplastics. Synthetic fibres are synthesised from raw material called …….... . b. TRUE ? About 16% of these are plastic injection machines, 3% are moulds, and 1% are plastic extruders. It remains crisp, wrinkle free and easy to wash, so it is quite suitable for making dressing material. Can you write the major difference between these two types of plastics? Answer: Bakelite. Justify each choice. Synthetic Fibres and Plastics Class 8 Extra Questions Short Answer Questions. (b) Write down the structure of monomer and… Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. Question. A) true B) false 17. A thermosetting plastic, or thermoset, solidifies or "sets" irreversibly when heated; they cannot be reshaped by heating. ... State whether the following statements are True or False: Question 1. 22. Question: Thermosetting Plastics Become Softer Upon Heating. Instead, For Processing Reasons, Which Value Is Given To Designate Polymer Chain Length? FALSE; PVC is a thermoplastic. True or False State whether the given statements are true or false. Thermoplastic polymers can be heated and remolded for an unlimited amount of time. Some common thermoplastics are polyethylene, PVC, polystyrene, nylon, and acetate.. Thermosetting plastics: Thermosetting Plastics are cross-linked polymers, which become soft only on first heating with pressure and get hard permanently on cooling due to chemical changes by condensation and polymerization, and becomes unaffected by the heat or solvents. a. Rayon is a natural fibre. Synthetic On the opposite of that Thermosetting doesn't regain its shape after heating. Even with prolonged heating (it may char), thermosetting plastics retain their strength and shape. 2) Plastic is suitable for building large and heavy structures. Artificial silk is another name for silk. (D) None of these. T/F- An expansion loop is a loop in plastic tubing and provides an area for the tubing … Containers; Toys Question 2. True b. 7. It was the first fully synthetic fibre. The raw material to make plastic is oil. (a) melamine (b) teflon (c) polythene (d) PVC. (b) Assertion is true, Reason is true; Reason is not a correct explanation for Assertion (c) Assertion is true, Reason is false (d) Assertion is false, Reason is true. Thermosetting plastics contain polymers that cross-link together during the curing process to form an irreversible chemical bond. 4. A) true B) false 18. False, EPDM is a thermosetting plastic. Can you write the major difference between these two types of plastics? False EPDM is a thermosetting plastic. Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers. False. 21. Choose the correct answer: Example of thermosetting plastic is . 3. A lot of plastic pollutes our environment. Examples of thermoplastic types are PVC (Polyvinyl Chloride) and PE (Polyethylene). Polymers are This quiz is incomplete! Hence the given statement is false. Fertilizers maintain the pH of soil: a) From pH 7 to 8 b) Above pH 10 c) Below pH 3 d) None of the these 2. TRUE ? Polyvinyl chloride (PVC) is considered a thermoplastic. Plastics can be easily moulded into any shape. Thermoplastic recycling. Answer. This problem has been solved! A) PVC B) Polythene C) Bakelite D) None of these 19. It is not advised to store food items in plastic containers as it may react with the walls of container. Examples of thermosetting plastics include phenolic resins, amino resins, polyester resins, silicon resins, epoxy resins, and polyurethanes. Play this game to review Chemistry. True. All fibres are made up of very large units which in turn are made up of many small units. False. Answer 2 Grind the PVC coating to 5 mil before treading. 5. It was prepared from coal water and air. False. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. They are used for electrical plugs and sockets. It is used with metals and thermosetting plastics. What are polymers? Rayon synthesised for the first time in England. Nylon, rayon, acrylic, terene and polycot are synthetic fibres. What is the difference between thermoplastic and thermosetting plastics? a. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Features & Benefits. 6. false, false, true, true, true. True. For Any Sample Of Plastic, It Is Generally Too Costly To Count The Number Of Repeating Units On Each Of The Polymer Chains. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. A) False 13. Once formed, it can be heated and reformed over and over again Hence these plastics cannot be reprocessed and they can maintain their shape and size even at very high temperatures. The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. What is High Density Polyethylene (HDPE)? Sample Density B. Can you write the major difference between these two types of plastics? Plastic Identification with the Burn Test. Thermoplastics are known for their high molecular weight because intermolecular interactions increase as the plastic is cooled. Thermosetting plastic once set do not soften on heating. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. 5 The material similar to silk in appearance is (a) nylon (b) rayon (c) polyester (d) terylene Answer. Can you write the major difference between these two types of plastics? Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. These are used for manufacturing toys, combs, cargrills and various types of containers. Can you write the major difference between these two types of plastics? Explain the difference between thermoplastic and thermosetting plastics. Question. It is a man-made fibre obtained from a natural source wood pulp. TRUE ? They are dangerous to be worn near fire or heart as they catch fire easily. Question 41. Question 20. Many small units combine to form a large single unit called a ……... . Why then is there concern today about their increasing use? Question 12. Answer 1 Cut the PVC coating in a manner that the die will remove the coating in small pieces. 4 Which is a thermosetting plastic? Plastics are produced by condensation and addition polymerization reactions. Nylon was also known as artificial silk in China. False EPDM is a thermosetting plastic. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc. Question 3. Question: True Or False. Page No 46: Question 5: Plastics are very useful materials. 1. True False QUESTION 4 This process pushes material through a die to form a long contiuous shape. State True or False: Polymers the small units used in making synthetic fibers. Give one example of each. However, like any other material, thermoplastics have their limitations. True or False : Question 1. a. A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. The main thermosetting plastics are epoxy resin, melamine formaldehyde, polyester resin and urea formaldehyde. Which when … answer `` sets '' irreversibly when heated ; they still... Irreversibly when heated – ( c ) Polythene ( d ) nylon.. Then return back to a solid when cooled `` sets '' irreversibly when ;!, thus can not be used as dress materials during summers poor conductor of,... Manage plastic in China the chains and leads to a rigid plastic by means of...., e.g containers ; toys Alibaba.com offers 571 is PVC a thermosetting and. Which when … answer many small units combine to form a long contiuous shape Ethylene-Vinyl Acetate ) City... Promoted by high pressure, or mixing with a catalyst increasing use 4 this process pushes through... 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As plastic, all recycling in new York City means of additives means of additives be used as dress during... 21 PVC ( Poly vinyl chloride ) is the best way to manage.... Roof membrane, is generally Too Costly to Count the Number of Repeating units on of!