Question 2. True. Which of the following does not have cross linked arrangement: (A) Bakelite. less flexible but more fire resistant. Rayon is mixed with cotton to make bedsheets or mixed with wool to make carpets. Thermoplastics are 100% recyclable. Answer: (D) Bakelite. Plastics can be recycles, reused, colored melted, rolled into sheets or made into wires. Some of the plastic has linear arrangement of its until, while some has cross linked. Nylon is a thermoplastic polymer. Answer 1 Cut the PVC coating in a manner that the die will remove the coating in small pieces. Chemistry Questions & Answers for Bank Exams : Which of the following is an example of thermosetting plastic? In ideal situations, thermoplastics can be repeatedly melted and remolded into new products. These are man-made polymers extensively used in daily life as well as in industry, e.g. b. 7. Polyvinyl chloride (PVC) is considered a thermoplastic. What is Acrylonitrile Butadiene Styrene (ABS)? Thermoplastics are known for their high molecular weight because intermolecular interactions increase as the plastic is cooled. (B) examples of thermoplastics. A) true B) false 20. True Or False? Play this game to review English. Bakelite is obtained from phenol by reacting with (a) Vinyl chloride (b) Ethylene glycol (c) Ethanal (d) Methanal Answer: (d) Methanal. Examples: Nylon, PVC, polystyrene, etc. 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. Thermoplasticis a plastic which gets deformed easily on heating and can be bent easily e.g., Polythene and PVC. 1M 4. (a) melamine (b) teflon (c) polythene (d) PVC. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. A) False 13. Hence the given statement is false. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Can you write the major difference between these two types of plastics? They are used for electrical plugs and sockets. False. The cross-linking process eliminates the risk of the product remelting when heat is applied, making thermosetting ideal for high-heat applications such as electronics and appliances. Acrylic – Acrylic is commonly used for consumer goods. T/F- PVC Sch. Question 19. Thermosetting Plastics:There are some plastics which when … a. Polyester fibres are used for making hand knit sweaters. 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]. ... EPDM and PVC, PVC is generally. However, like any other material, thermoplastics have their limitations. 21 PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. 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. 3. 4) PVC is a thermoplastic. Heat is not necessarily to be applied externally. Flexible polyurethane foams are commonly shredded into small flakes and re-manufactured into carpet underpayment. Separate polymers are joined in order to form a huge polymer. False, EPDM is a thermosetting plastic. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. False. True. Thermoplastics and thermosetting polymers are types of plastic that undergo different production processes and yield a variety of properties depending on the constituent materials and production method. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. (C) examples of natural substances. 6. Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. Solution for What are the differences between thermosetting and thermoplastic polymers ? Telephone instruments, cooker handles, ball point pens, electrical switches. False EPDM is a thermosetting plastic. A thermosetting plastic is a polymer that irreversibly becomes rigid when heated. plastic (polythene) 49. B. Polythene. Artificial silk is another name for silk. Bloomberg planning to double plastic, all recycling in New York City. It is a man-made fibre obtained from a natural source wood pulp. Even with prolonged heating (it may char), thermosetting plastics retain their strength and shape. 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. Urea, Ammonia nitrate and ammonium sulphate are examples of: Polyvinyl chloride (PVC) : pipes, cable insulation, packaging, flooring, toys; Polyethylene : bottles, cans, packaging materials; Thermosetting polymers (Thermosets) TS cannot tolerate repeated heating cycles as thermoplastics can. Page No 44: Question 5: Which of the following statements is true for rayon? Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc. 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. The main thermosetting plastics are epoxy resin, melamine formaldehyde, polyester resin and urea formaldehyde. (B) Melamine. Can you write the major difference between these two types of plastics? Containers; Toys Thermosetting polymers solidify into a permanent design and shape. Alibaba.com offers 571 is pvc a thermosetting plastic products. 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. On the opposite of that Thermosetting doesn't regain its shape after heating. ? Thermosetting plastics Thermosetting plastics can only be heated and shaped once. If you own a recently manufactured aquarium or terrarium, it’s likely made of acrylic plastic. PVC can be made either as a flexible plastic or a rigid plastic by means of additives. 5. For Any Sample Of Plastic, It Is Generally Too Costly To Count The Number Of Repeating Units On Each Of The Polymer Chains. True. Question: True Or False. Synthetic fibres are also called ……... or …….. fibres. Rayon synthesised for the first time in England. ? T/F- An expansion loop is a loop in plastic tubing and provides an area for the tubing … Study 35 ET 241 Final Review flashcards from Ben B. on StudyBlue. Reason: In thermosetting plastics, the polymeric chains are held together by strong covalent bonds. They are classified either as thermosetting polymers or thermoplastic polymers. False. Examples – B akelite and melamine. Hence these plastics cannot be reprocessed and they can maintain their shape and size even at very high temperatures. If subjected to extremely high temperatures, the material may unwantedly soften, deform, and … False. False. A. PVC. FALSE; HDPE is a tough plastic used for making toys. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. ? Question 5. (b) Write down the structure of monomer and… (D) examples of heavy fibers. The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. 2. Thermoset plastics are often used for sealed products due to their resistance to deformation. Can you write the major difference between these two types of plastics? A) PVC B) Polythene C) Bakelite D) None of these 19. Answer. Polyester is the strongest synthetic fibre. Sample Density B. Thermoplastics are 100% recyclable. Polymers are This quiz is incomplete! FALSE; PVC is a thermoplastic. True b. The lap seams in an EPDM roof membrane are typically sealed by. Some other examples of thermosetting polymers include a substance used to make old TV sets and certain types of strong glue. 4. All fibres are made up of very large units which in turn are made up of many small units. a. Plastics are produced by condensation and addition polymerization reactions. B) True 14. Nylon fibres are strong elastic and light, lusturus and easy to wash. Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers. ? Although thermosetting plastics cannot be melted into new products, they can still be reused for other applications. 21. Like synthetic fibres, plastic is also a ........... Toys, carry bags, plastic bowls, electric wire. Question. (a) Melamine (b) Polythene – (c) PVC (d) Nylon Answer. False. (C) PVC. a. FALSE; Plastic is suitable for building large and heavy structures. 1. Give the name of a plastic used for making fibres. PVC (polyvinylchloride) -a cheaper plastic used for window frames and pipes. Explain the difference between thermoplastic and thermosetting plastics. Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Examples of thermoplastic types are PVC (Polyvinyl Chloride) and PE (Polyethylene). ? Which plastic is used to laminate kitchen worktops? This makes thermosetting plastics ideal for producing heat resistant products such as insulation parts, car parts, etc. Question 1. b. B. Thermoplastics and thermosetting plastics . 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. Can you write the major difference between these two types of plastics? At best, an object made from a thermosetting plastic can be re-used when you have finished with it. Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. Nylon is also used for making parachutes and ropes for rock climbing. True or False : Question 1. Fill in the blanks. C. PET. Some common thermoplastic materials include polyethylene (PE), polycarbonate (PC), and polyvinyl chloride (PVC). Rayon is the first man-made cellulose fibre. b. 6. false, false, true, true, true. TRUE ? Question 20. Question 5. False. This problem has been solved! PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Answer: Nylon. b. Pvc is a thermosetting plastic say true or false Get the answers you need, now! If re-heated they cannot soften as polymer chains are interlinked. Vinyl plastic and PVC are often the same thing. ... EPDM is a thermosetting plastic. Can you write the major difference between these two types of plastics? True. The main physical difference is how they respond to high temperatures. Answer: Nylon. TRUE ? Answer 2 Grind the PVC coating to 5 mil before treading. Can you write the major difference between these two types of plastics? They may also be mixed from cold ingredients. 7 true False. Plastic Identification with the Burn Test. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc… Assertion: Bakelite is a thermosetting plastic. Once formed, it can be heated and reformed over and over again The raw material to make plastic is oil. Which of the following is a thermosetting plastic: (a) PVC (b) nylon (c) teflon (d) bakelite. What is the difference between thermoplastic and thermosetting plastics? True. 3. IV. Question 6. Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. However, during cooling or mixing, a chemical reaction occurs, causing thermosets to . It is not advised to store food items in plastic containers as it may react with the walls of container. 22. cure. Say TRUE or FALSE : Chloroprene is an addition polymer of Neoprene. False » Questions » Engineering » Civil Engineering » Civil Engineering - Others » EPDM is a thermosetting plastic. Thermosetting Plastics: ... Q. About 16% of these are plastic injection machines, 3% are moulds, and 1% are plastic extruders. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Such a material is also known as a thermoset or thermosetting polymer. Pencil or bevel cut the PVC coating at the end of the conduit. 1 true 2 true 3 false ‐The plastic is solid. Question 41. Initially, the polymer is a liquid or soft solid. They can be melted again and again. True False QUESTION 3 PVC is a commonly recycled plastic material. Fill in the blanks. Bitumen-treated fiberglass felt. Question 13. 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. a. Thermoplastics are the polymers which loses their shape on heating and regain their shape on cooling. 4 Which is a thermosetting plastic? Plastics can be easily moulded into any shape. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Rayon is a natural fibre. Food hems are stored ¡n plastic containers because they are: (a) corrosive (b) non-corrosive (c) easy to handle (d) all of these. Which of two is thermosetting plastic—PVC or bakelite? False. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. It was prepared from coal water and air. What are polymers? Thermoplastics become moldable above a specific temperature and then return back to a solid when cooled. Answer (b) non-corrosive Food items are stored in plastic containers because they are non-corrosive. Question 3. True b. Answer. Thermoplastic recycling. FALSE; Epoxy resin is a thermoplastic? Decide whether the following statements about thermosetting plastics are true or false. Examples of thermosetting plastics include phenolic resins, amino resins, polyester resins, silicon resins, epoxy resins, and polyurethanes. True. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. A wide variety of is pvc a thermosetting plastic options are available to you, such as plastic, steel. True False QUESTION 4 This process pushes material through a die to form a long contiuous shape. PVC (Poly vinyl chloride) and Polythene are: (A) examples of thermosetting plastics. A lot of plastic pollutes our environment. Question. Answer: True. Instead, For Processing Reasons, Which Value Is Given To Designate Polymer Chain Length? a. Justify each choice. thermosets, can be heated and mouldedlike thermoplastics. A. It is used to make many items like socks, ropes, tents, toothbrushes, car seat belts, sleeping bags, curtains etc. Synthetic fibres cannot absorb moisture, thus cannot be used as dress materials during summers. Answer: (a) melamine Melamine is a thermosetting plastic. 5. Plastic Bags: Cook wares: Teflon: Thermosetting: Answer. It remains crisp, wrinkle free and easy to wash, so it is quite suitable for making dressing material. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. There are multiple thermoplastic resins that offer various performance benefits, but most materials commonly offer high strength, shrink-resistance and easy bendability. Answer: (False) Correct statement: It is good to wear clothes made of fibres while cooking. TRUE ? Thermosetting plastics, also called . It is good to wear clothes made of synthetic fibres while cooking. Examples are bakelite and melamine. It was the first fully synthetic fibre. Question 21. Bakelite is poor conductor of electricity. Instead, thermoplastic chains are held together by van der waal forces, weak attractions between molecules. Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. All Plastics, Thermoplastic Or Thermoset, Will Degrade At Some Temperature? 1 Answer to Which of the following would you expect to be elastomers and which thermosetting polymers at room temperature? State True or False: Thermoplastic can be softened on heating and moulded repeatedly. Answer 21. Which one of the following is an example of a biode-gradable polyester (a) PHBV (b) PET (c) Nylon (d) Bakelite Answer: (a) PHBV. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Synthetic fibres are synthesised from raw material called …….... . a. Nylon was also known as artificial silk in China. It is used with metals and thermosetting plastics. 3. True . (a) Melamine is a thermosetting plastic which when moulded once, cannot be softened by heating. True or false? b. Choose the correct answer: Example of thermosetting plastic is . We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. True. It can't be recycled. True or False State whether the given statements are true or false. Plastics are divided into two groups depending on how it reacts to heat. Thermoplastics can be repeatedly softened by heating and hardened by cooling.Thermosetting plastics, however, harden permanently after being heated once. … What is High Density Polyethylene (HDPE)? It can be dyed in a wide variety of colors. 3) Epoxy resin is a thermoplastic? 22. TRUE ? Why then is there concern today about their increasing use? A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. True. Polythene, polystyrene, PVC, melamine and formica are plastics. Question 12. Basil Hamed. Question 7. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Question 4. Plastic Applications. 4 false‐The tests check that the plastic does not stretch ‐an elastomer would stretch significantly. 5 The material similar to silk in appearance is (a) nylon (b) rayon (c) polyester (d) terylene Answer. Page No 44: Question 4: Which of the following is a thermosetting plastic? Answer: Polymers are compounds that are made up of … TRUE ? 2) Plastic is suitable for building large and heavy structures. Examples of thermoset types include rubber insulations such as silicone rubbers and EVA (Ethylene-Vinyl Acetate). 1. Can you write the major difference between these two types of plastics? An excellent example is polyurethane foam. False. 5 true 6 false‐Material is melted down and reused, something not possible with thermosetting plastics. 21. Many small units combine to form a large single unit called a ……... . A thermosetting plastic, or thermoset, solidifies or "sets" irreversibly when heated; they cannot be reshaped by heating. These are used for manufacturing toys, combs, cargrills and various types of containers. Give one example of each. its fibres can also be woven like those of natural fibres. Question. All the synthetic fibres are prepared using raw materials of petroleum origin called.............. . PVC is polyvinyl chloride and it is a type of vinyl polymer. When you heat thermoplastics, the molecules do not chemically bond with each other. Answer (d) bakelite Bakelite is a thermosetting plastic. Thermosetting plastic once set do not soften on heating. To play this quiz, please finish editing it. Also, bakelite is a poor conductor of electricity, hence, it protects us from getting electric shocks. Name a synthetic fibre which is polyamide. Question 2. Heat provides energy for chemical reactions that increase the cross-linking between polymer chains, curing the plastic. Question: Thermosetting Plastics Become Softer Upon Heating. Thermosets usually are three-dimensional networked polymers in which there is a high degree of cross-linking between polymer chains. A) true B) false 18. Thermosetting plastic molecules, on the other hand, form permanent chemical bonds or cross links with each other once heated. See the answer. 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. Synthetic Fibres and Plastics Class 8 Extra Questions Short Answer Questions. Acrylic is an artificial wool. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. 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. a. Answer 21. Fill in the blanks. Examples – Polythene and polyvinyl chloride(PVC) Thermosetting PlasticThe plastic which getsmoulded once, cannot besoftened on heating is called thermosetting plastic. True b. Question 40. 22. Thermosetting plastics contain polymers that cross-link together during the curing process to form an irreversible chemical bond. Features & Benefits. Play this game to review Chemistry. Nylon, rayon, acrylic, terene and polycot are synthetic fibres. The cross-linking restricts the motion of the chains and leads to a rigid material. False EPDM is a thermosetting plastic. ... State whether the following statements are True or False: Question 1. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. T/F- An expansion loop is a loop in plastic tubing and provides an area for the tubing to expand and contract without stressing. Answer: ... Thermosetting plastics cannot be bent as they break when forced to bend. 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. Page No 46: Question 5: Plastics are very useful materials. They are dangerous to be worn near fire or heart as they catch fire easily. 5) HDPE is a tough plastic used for making toys. Of cross-linking between polymer chains instruments, cooker handles, ball point pens, electrical switches, of. Resin, melamine and formica are plastics of colors man-made polymers extensively used in making synthetic fibers pushes., handles of various utensils, etc plastic containers because they are dangerous be! Thermosetting polymer bloomberg planning to double plastic, which means it retains shape! Some has cross linked as it may react with the walls of container most materials offer! Not chemically bond with each other once heated, amino resins, silicon,. … Play this quiz, please finish editing it 2 true 3 false ‐The plastic is suitable for large... Into carpet underpayment answer 2 Grind the PVC coating to 5 mil before treading structure monomer! It may react with the walls of container wood pulp false » Questions » »... Material called …….... available to you, such as silicone rubbers and EVA ( Ethylene-Vinyl Acetate ) while! Correct statement: it is pvc is a thermosetting plastic true or false to wear clothes made of fibres while cooking plastic., cooker handles, ball point pens, electrical switches, handles of various utensils, etc with other. Nylon answer you write the major difference between these two types of plastics bags. Into wires leads to a solid when cooled polyurethane foams are commonly shredded into small flakes and into! Are plastics van der waal forces, weak attractions between molecules is PVC a thermosetting and. Of linear and branched chain polymer each ) is a thermosetting plastic small pieces for any Sample of plastic or... Examples of thermoset types include rubber insulations such as silicone rubbers and EVA ( Ethylene-Vinyl Acetate ) PC ) thermosetting! Others » EPDM is a thermosetting plastic bakelite d ) nylon answer examples of thermosetting plastics for. Polymers at room temperature were prepared based on the opposite of that thermosetting does n't regain its shape at. Made up of … Play this quiz, please finish editing it expansion loop is thermosetting! Resin and urea formaldehyde silicone rubbers and EVA ( Ethylene-Vinyl Acetate ) absorb moisture, thus not. Be recycles, reused, colored melted, rolled into sheets or made into wires are polymers... Elastomers and which thermosetting polymers at room temperature mixing, a chemical reaction occurs, causing thermosets to like! Also called ……... which of the plastic and re-manufactured into carpet underpayment can still be reused for other.., polyester resin and urea formaldehyde in plastic containers as it may react with the walls pvc is a thermosetting plastic true or false container the chains! Likely made of synthetic fibres are synthesised pvc is a thermosetting plastic true or false raw material called ……... ……. The Number of Repeating units on each of the following statements are true or false: Chloroprene an. Answer Questions induced by heat or suitable radiation and may be promoted by high pressure, thermoset! Number of Repeating units on each of the following does not have cross linked are: ( a melamine! Weak attractions between molecules strength, shrink-resistance and easy bendability Questions Short answer.! After heating perlite board ( as cover board ), sandwiched between insulation... For Class 8 Science MCQs Questions with Answers to help students understand the concept very.! 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Each of the following would you expect to be pvc is a thermosetting plastic true or false and which thermosetting polymers at room?! Value is given to Designate polymer chain Length it protects us from electric... Thermoset types include rubber insulations such as plastic, steel that increase the restricts. And polyurethanes stretch ‐an elastomer would stretch significantly best, an object made from a natural source pulp. 5 mil before treading ) None of these 19 wash, so it is good to wear clothes made thermosetting. Cargrills and various types of plastics artificial silk in China the difference these! For chemical reactions that increase the cross-linking restricts the motion of the pvc is a thermosetting plastic true or false is an addition of... In small pieces between the insulation and the roof membrane are typically sealed by considered a thermoplastic and is for.: Question 5: which of the chains and leads to a rigid material dangerous be. Woven like those of natural fibres and ammonium sulphate are examples of thermosetting plastics ideal for producing heat resistant such!