4 Which is a thermosetting plastic? Rayon is the first man-made cellulose fibre. Thermoplastics are known for their high molecular weight because intermolecular interactions increase as the plastic is cooled. True. FALSE; Epoxy resin is a thermoplastic? Answer: False. It is used with metals and thermosetting plastics. 21 PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Which one of the following is an example of a biode-gradable polyester (a) PHBV (b) PET (c) Nylon (d) Bakelite Answer: (a) PHBV. Question 4. Can you write the major difference between these two types of plastics? Rayon synthesised for the first time in England. Some other examples of thermosetting polymers include a substance used to make old TV sets and certain types of strong glue. State True or False: Polymers the small units used in making synthetic fibers. It can't be recycled. 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 is polyvinyl chloride and it is a type of vinyl polymer. PE and PVC may also be cross-linked making them thermosetting types. Which of the following is a thermosetting plastic: (a) PVC (b) nylon (c) teflon (d) bakelite. It is a man-made fibre obtained from a natural source wood pulp. Thermoplastics are 100% recyclable. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Answer: Bakelite. Answer 21. True Or False? Answer 1 Cut the PVC coating in a manner that the die will remove the coating in small pieces. 5. 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. Answer: Polymers are compounds that are made up of … These are used for manufacturing toys, combs, cargrills and various types of containers. 4) PVC is a thermoplastic. True. (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. (C) PVC. True or false? The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. 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. Artificial silk is another name for silk. Explain the difference between thermoplastic and thermosetting plastics. They may also be mixed from cold ingredients. Answer: Nylon. Play this game to review Chemistry. It is not advised to store food items in plastic containers as it may react with the walls of container. Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers. It was the first fully synthetic fibre. b. Question: True Or False. A thermosetting plastic is a polymer that irreversibly becomes rigid when heated. ? What is Acrylonitrile Butadiene Styrene (ABS)? Answer. cure. 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. There are multiple thermoplastic resins that offer various performance benefits, but most materials commonly offer high strength, shrink-resistance and easy bendability. 21. FALSE; Plastic is suitable for building large and heavy structures. Also, bakelite is a poor conductor of electricity, hence, it protects us from getting electric shocks. Synthetic fibres are synthesised from raw material called …….... . Answer: ... Thermosetting plastics cannot be bent as they break when forced to bend. Plastics can be easily moulded into any shape. 3. Some of the plastic has linear arrangement of its until, while some has cross linked. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc. What are polymers? 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. 22. Give an example of linear and branched chain polymer each. The main thermosetting plastics are epoxy resin, melamine formaldehyde, polyester resin and urea formaldehyde. 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. b. Polyvinyl chloride (PVC) is considered a thermoplastic. a. ? Justify each choice. Once formed, it can be heated and reformed over and over again Telephone instruments, cooker handles, ball point pens, electrical switches. Answer: True. 1M 5. Thermosetting plastics Thermosetting plastics can only be heated and shaped once. Which of the following does not have cross linked arrangement: (A) Bakelite. Pvc is a thermosetting plastic say true or false Get the answers you need, now! All fibres are made up of very large units which in turn are made up of many small units. Examples of thermoset types include rubber insulations such as silicone rubbers and EVA (Ethylene-Vinyl Acetate). Answer: (False) Correct statement: It is good to wear clothes made of fibres while cooking. ? About 16% of these are plastic injection machines, 3% are moulds, and 1% are plastic extruders. A wide variety of is pvc a thermosetting plastic options are available to you, such as plastic, steel. thermosets, can be heated and mouldedlike thermoplastics. Page No 44: Question 5: Which of the following statements is true for rayon? Refuse (avoid) is the best way to manage plastic. Instead, thermoplastic chains are held together by van der waal forces, weak attractions between molecules. It was prepared from coal water and air. True b. T/F- PVC Sch. (B) examples of thermoplastics. T/F- An expansion loop is a loop in plastic tubing and provides an area for the tubing … What is the difference between thermoplastic and thermosetting plastics? True . Nylon is a thermoplastic polymer. Examples of thermosetting plastics include phenolic resins, amino resins, polyester resins, silicon resins, epoxy resins, and polyurethanes. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Thermoplastic polymers can be heated and remolded for an unlimited amount of time. The lap seams in an EPDM roof membrane are typically sealed by. Containers; Toys Hence these plastics cannot be reprocessed and they can maintain their shape and size even at very high temperatures. All the synthetic fibres are prepared using raw materials of petroleum origin called.............. . This makes thermosetting plastics ideal for producing heat resistant products such as insulation parts, car parts, etc. Give the name of a plastic used for making fibres. True. The cross-linking restricts the motion of the chains and leads to a rigid material. 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. 3) Examples are polythene and polyvinyl chloride. a. a. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc… (D) examples of heavy fibers. See the answer. In ideal situations, thermoplastics can be repeatedly melted and remolded into new products. True. True. A) PVC B) Polythene C) Bakelite D) None of these 19. Examples: Nylon, PVC, polystyrene, etc. False EPDM is a thermosetting plastic. Pencil or bevel cut the PVC coating at the end of the conduit. False. 5. Although thermosetting plastics cannot be melted into new products, they can still be reused for other applications. A lot of plastic pollutes our environment. Thermoset plastics are often used for sealed products due to their resistance to deformation. Fill in the blanks. Can you write the major difference between these two types of plastics? 1. Nylon is also used for making parachutes and ropes for rock climbing. 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]. Thermoplastics become moldable above a specific temperature and then return back to a solid when cooled. 1M 4. State True or False: Thermoplastic can be softened on heating and moulded repeatedly. Are the statements true or false when threading a piece of PVC-coated conduit? Answer. What is High Density Polyethylene (HDPE)? Curing is induced by heat or suitable radiation and may be promoted by high pressure, or mixing with a catalyst. All Plastics, Thermoplastic Or Thermoset, Will Degrade At Some Temperature? They are used for electrical plugs and sockets. Can you write the major difference between these two types of plastics? A) true B) false 20. a. D. Bakelite. Some common thermoplastic materials include polyethylene (PE), polycarbonate (PC), and polyvinyl chloride (PVC). MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Acrylic is an artificial wool. Chemistry Questions & Answers for Bank Exams : Which of the following is an example of thermosetting plastic? Question 41. PVC can be made either as a flexible plastic or a rigid plastic by means of additives. False. … The raw material to make plastic is oil. Plastics can be recycles, reused, colored melted, rolled into sheets or made into wires. Nylon was made in 1931. PVC (polyvinylchloride) -a cheaper plastic used for window frames and pipes. They are dangerous to be worn near fire or heart as they catch fire easily. Sample Density B. Many small units combine to form a large single unit called a ……... . Question 2. A. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Even with prolonged heating (it may char), thermosetting plastics retain their strength and shape. 21. (C) examples of natural substances. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Polyester is the strongest synthetic fibre. False. A) true B) false 18. Question 13. TRUE ? 6. false, false, true, true, true. It is good to wear clothes made of synthetic fibres while cooking. Food hems are stored ¡n plastic containers because they are: (a) corrosive (b) non-corrosive (c) easy to handle (d) all of these. 5 The material similar to silk in appearance is (a) nylon (b) rayon (c) polyester (d) terylene Answer. True. Explain why the following are made of thermosetting plastics: (a) Saucepan handles (b) Electric plugs/switches/plug boards 6. Choose the correct answer: Example of thermosetting plastic is . Plastic Identification with the Burn Test. 7. True. 3. True or False State whether the given statements are true or false. 7 true Question 12. a. ? False. Question 40. Nylon was also known as artificial silk in China. Question. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. When you heat thermoplastics, the molecules do not chemically bond with each other. Nylon, rayon, acrylic, terene and polycot are synthetic fibres. 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: Fill in the blanks. Thermoplasticis a plastic which gets deformed easily on heating and can be bent easily e.g., Polythene and PVC. b. Question 7. Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. False. To play this quiz, please finish editing it. Name a synthetic fibre which is polyamide. ? 1. Hence the given statement is false. Features & Benefits. 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. 5) HDPE is a tough plastic used for making toys. If you own a recently manufactured aquarium or terrarium, it’s likely made of acrylic plastic. If subjected to extremely high temperatures, the material may unwantedly soften, deform, and … Like synthetic fibres, plastic is also a ........... Toys, carry bags, plastic bowls, electric wire. 3) Epoxy resin is a thermoplastic? plastic (polythene) 49. Answer (d) bakelite Bakelite is a thermosetting plastic. ... EPDM and PVC, PVC is generally. Question 2. Vinyl plastic and PVC are often the same thing. Question: Thermosetting Plastics Become Softer Upon Heating. 22. TRUE ? Alibaba.com offers 571 is pvc a thermosetting plastic products. Assertion: Bakelite is a thermosetting plastic. Rayon is a natural fibre. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Thermosetting plastics, also called . True. ... State whether the following statements are True or False: Question 1. Question 5. Examples – Polythene and polyvinyl chloride(PVC) Thermosetting PlasticThe plastic which getsmoulded once, cannot besoftened on heating is called thermosetting plastic. 2) Plastic is suitable for building large and heavy structures. Answer: Nylon. False. For Any Sample Of Plastic, It Is Generally Too Costly To Count The Number Of Repeating Units On Each Of The Polymer Chains. 6. Examples of thermoplastic types are PVC (Polyvinyl Chloride) and PE (Polyethylene). Such a material is also known as a thermoset or thermosetting polymer. C. PET. Question. Separate polymers are joined in order to form a huge polymer. A) False 13. Thermosetting Plastics:There are some plastics which when … B. Thermoplastics and thermosetting plastics . False. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. True False QUESTION 4 This process pushes material through a die to form a long contiuous shape. Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. FALSE; HDPE is a tough plastic used for making toys. An excellent example is polyurethane foam. Which plastic is used to laminate kitchen worktops? Plastic Applications. Thermoplastics are the polymers which loses their shape on heating and regain their shape on cooling. Bitumen-treated fiberglass felt. 3. Bakelite is poor conductor of electricity. Answer: True. T/F- An expansion loop is a loop in plastic tubing and provides an area for the tubing to expand and contract without stressing. Question 20. On the opposite of that Thermosetting doesn't regain its shape after heating. Processed under a changed temperature [ 1 ] softened on heating and can be repeatedly melted remolded! Large units which in turn are made up of very large units which in are! It is a loop in plastic tubing and provides an area for the tubing to expand contract. 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