? Instead, thermoplastic chains are held together by van der waal forces, weak attractions between molecules. 7. Whereas, the others mentioned are thermoplastics that can be moulded on heating. The melting point of PVC is normally 212 0 C. Glass transition temperature is about 81 0 C. Glass transition temperature is the temperature at which the polymer transits from a hard glassy state to a rubbery state upon the increasing of temperature. Nylon is also used for making parachutes and ropes for rock climbing. Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. Examples of thermoplastic types are PVC (Polyvinyl Chloride) and PE (Polyethylene). It is used to make many items like socks, ropes, tents, toothbrushes, car seat belts, sleeping bags, curtains etc. False EPDM is a thermosetting plastic. Thermosets usually are three-dimensional networked polymers in which there is a high degree of cross-linking between polymer chains. Question 40. Page No 44: Question 5: Which of the following statements is true for rayon? PE and PVC may also be cross-linked making them thermosetting types. 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. Answer: Polymers are compounds that are made up of … Fill in the blanks. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. True. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. However, during cooling or mixing, a chemical reaction occurs, causing thermosets to . If re-heated they cannot soften as polymer chains are interlinked. Thermosetting plastics, also called . 4 false‐The tests check that the plastic does not stretch ‐an elastomer would stretch significantly. Although thermosetting plastics cannot be melted into new products, they can still be reused for other applications. Question. a. However, like any other material, thermoplastics have their limitations. Question 6. A) PVC B) Polythene C) Bakelite D) None of these 19. Examples are bakelite and melamine. What is High Density Polyethylene (HDPE)? ... State whether the following statements are True or False: Question 1. thermosets, can be heated and mouldedlike thermoplastics. True b. True Or False? 3. Instead, thermoplastic chains are held together by van der waal forces, weak attractions between molecules. C. PET. 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. 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. Synthetic fibres are synthesised from raw material called …….... . These are used for manufacturing toys, combs, cargrills and various types of containers. Polythene, polystyrene, PVC, melamine and formica are plastics. Thermosetting plastic molecules, on the other hand, form permanent chemical bonds or cross links with each other once heated. FALSE; HDPE is a tough plastic used for making toys. b. Question 19. Containers; Toys False. Why then is there concern today about their increasing use? It is a man-made fibre obtained from a natural source wood pulp. Refuse (avoid) is the best way to manage plastic. Basil Hamed. B. Polythene. b. 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. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Question 3. Question 2. True. 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. B) True 14. True False QUESTION 3 PVC is a commonly recycled plastic material. Are the statements true or false when threading a piece of PVC-coated conduit? They can be melted again and again. False, EPDM is a thermosetting plastic. Acrylic – Acrylic is commonly used for consumer goods. FALSE; PVC is a thermoplastic. Question 7. Study 35 ET 241 Final Review flashcards from Ben B. on StudyBlue. a. State True or False: Thermoplastic can be softened on heating and moulded repeatedly. Answer (b) non-corrosive Food items are stored in plastic containers because they are non-corrosive. Synthetic fibres are also called ……... or …….. fibres. False EPDM is a thermosetting plastic. 5 true 6 false‐Material is melted down and reused, something not possible with thermosetting plastics. Play this game to review Chemistry. (B) Melamine. TRUE ? 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. Urea, Ammonia nitrate and ammonium sulphate are examples of: a. (b) Write down the structure of monomer and… State True or False: Polymers the small units used in making synthetic fibers. a. 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. Explain why the following are made of thermosetting plastics: (a) Saucepan handles (b) Electric plugs/switches/plug boards 6. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Justify each choice. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. If you own a recently manufactured aquarium or terrarium, it’s likely made of acrylic plastic. Answer 1 Cut the PVC coating in a manner that the die will remove the coating in small pieces. Rayon synthesised for the first time in England. ? PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Pencil or bevel cut the PVC coating at the end of the conduit. True or False State whether the given statements are true or false. Question 2. Answer. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. A. PVC. a. (a) Melamine (b) Polythene – (c) PVC (d) Nylon Answer. The main thermosetting plastics are epoxy resin, melamine formaldehyde, polyester resin and urea formaldehyde. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. 3) Epoxy resin is a thermoplastic? Thermosetting Plastics: ... Q. Can you write the major difference between these two types of plastics? Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc. Polymers are This quiz is incomplete! 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. To play this quiz, please finish editing it. Play this game to review English. Fill in the blanks. True or false? Flexible polyurethane foams are commonly shredded into small flakes and re-manufactured into carpet underpayment. It is good to wear clothes made of synthetic fibres while cooking. Give the name of a plastic used for making fibres. Explain the difference between thermoplastic and thermosetting plastics. Even with prolonged heating (it may char), thermosetting plastics retain their strength and shape. b. 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. False » Questions » Engineering » Civil Engineering » Civil Engineering - Others » EPDM is a thermosetting plastic. A) False 13. Thermoplastics are the polymers which loses their shape on heating and regain their shape on cooling. In ideal situations, thermoplastics can be repeatedly melted and remolded into new products. Choose the correct answer: Example of thermosetting plastic is . It was the first fully synthetic fibre. 22. Synthetic Fibres and Plastics Class 8 Extra Questions Short Answer Questions. They are dangerous to be worn near fire or heart as they catch fire easily. a. True. A lot of plastic pollutes our environment. Plastics can be easily moulded into any shape. Answer: (D) Bakelite. (a) melamine (b) teflon (c) polythene (d) PVC. True or False : Question 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. On the opposite of that Thermosetting doesn't regain its shape after heating. They may also be mixed from cold ingredients. The raw material to make plastic is oil. Answer: ... Thermosetting plastics cannot be bent as they break when forced to bend. It remains crisp, wrinkle free and easy to wash, so it is quite suitable for making dressing material. Nylon, rayon, acrylic, terene and polycot are synthetic fibres. Question. True b. ? 1 true 2 true 3 false ‐The plastic is solid. Question 5. 21. Nylon was also known as artificial silk in China. Say TRUE or FALSE : Chloroprene is an addition polymer of Neoprene. Plastic Bags: Cook wares: Teflon: Thermosetting: Answer. PVC (polyvinylchloride) -a cheaper plastic used for window frames and pipes. 1M 4. False. Bloomberg planning to double plastic, all recycling in New York City. PVC is polyvinyl chloride and it is a type of vinyl polymer. A) true B) false 17. Reason: In thermosetting plastics, the polymeric chains are held together by strong covalent bonds. 5) HDPE is a tough plastic used for making toys. Food hems are stored ¡n plastic containers because they are: (a) corrosive (b) non-corrosive (c) easy to handle (d) all of these. They are classified either as thermosetting polymers or thermoplastic polymers. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. 6. false, false, true, true, true. Alibaba.com offers 571 is pvc a thermosetting plastic products. Page No 46: Question 5: Plastics are very useful materials. 3. ... EPDM is a thermosetting plastic. (B) examples of thermoplastics. A) true B) false 20. Question 5. Nylon fibres are strong elastic and light, lusturus and easy to wash. Examples of thermoset types include rubber insulations such as silicone rubbers and EVA (Ethylene-Vinyl Acetate). Question 41. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Question: True Or False. 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. (D) None of these. What is Acrylonitrile Butadiene Styrene (ABS)? Answer: (False) Correct statement: It is good to wear clothes made of fibres while cooking. A. 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. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc… 22. For Any Sample Of Plastic, It Is Generally Too Costly To Count The Number Of Repeating Units On Each Of The Polymer Chains. Bitumen-treated fiberglass felt. Examples – Polythene and polyvinyl chloride(PVC) Thermosetting PlasticThe plastic which getsmoulded once, cannot besoftened on heating is called thermosetting plastic. What are polymers? The cross-linking restricts the motion of the chains and leads to a rigid material. False. 6. Thermoplastics are 100% recyclable. Hence the given statement is false. Plastic Applications. TRUE ? Thermosetting Plastics:There are some plastics which when … 3. (C) examples of natural substances. A thermosetting plastic is a polymer that irreversibly becomes rigid when heated. Which of the following does not have cross linked arrangement: (A) Bakelite. Thermosetting plastics become softer upon heating. a. Thermoset plastics are often used for sealed products due to their resistance to deformation. Thermoplastic recycling. Answer 21. Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. ... EPDM and PVC, PVC is generally. Can you write the major difference between these two types of plastics? ? Sample Density B. Rayon is the first man-made cellulose fibre. 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. Thermoplastic polymers can be heated and remolded for an unlimited amount of time. A thermosetting plastic, or thermoset, solidifies or "sets" irreversibly when heated; they cannot be reshaped by heating. Thermosetting plastic once set do not soften on heating. Which of two is thermosetting plastic—PVC or bakelite? T/F- An expansion loop is a loop in plastic tubing and provides an area for the tubing … It is used with metals and thermosetting plastics. Heat provides energy for chemical reactions that increase the cross-linking between polymer chains, curing the plastic. D. Bakelite. Polyvinyl chloride (PVC) is considered a thermoplastic. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. False. Question 13. Thermosetting polymers solidify into a permanent design and shape. 4) PVC is a thermoplastic. Question 1. Question 20. TRUE ? Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. True . less flexible but more fire resistant. PVC can be made either as a flexible plastic or a rigid plastic by means of additives. b. Curing is induced by heat or suitable radiation and may be promoted by high pressure, or mixing with a catalyst. FALSE; Plastic is suitable for building large and heavy structures. Such a material is also known as a thermoset or thermosetting polymer. Thermosetting plastics contain polymers that cross-link together during the curing process to form an irreversible chemical bond. 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. Plastics are produced by condensation and addition polymerization reactions. When you heat thermoplastics, the molecules do not chemically bond with each other. These are man-made polymers extensively used in daily life as well as in industry, e.g. cure. Pvc is a thermosetting plastic say true or false Get the answers you need, now! It was prepared from coal water and air. The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. Answer 21. What is the difference between thermoplastic and thermosetting plastics? Which of the following is a thermosetting plastic: (a) PVC (b) nylon (c) teflon (d) bakelite. True False QUESTION 4 This process pushes material through a die to form a long contiuous shape. Some common thermoplastic materials include polyethylene (PE), polycarbonate (PC), and polyvinyl chloride (PVC). All fibres are made up of very large units which in turn are made up of many small units. Initially, the polymer is a liquid or soft solid. Thermoplastics are known for their high molecular weight because intermolecular interactions increase as the plastic is cooled. 7 true Acrylic is an artificial wool. Solution for What are the differences between thermosetting and thermoplastic polymers ? MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Synthetic It can't be recycled. True b. Which plastic is used to laminate kitchen worktops? Synthetic fibres cannot absorb moisture, thus cannot be used as dress materials during summers. Answer (d) bakelite Bakelite is a thermosetting plastic. Plastics can be recycles, reused, colored melted, rolled into sheets or made into wires. Telephone instruments, cooker handles, ball point pens, electrical switches. False. 1M 5. At best, an object made from a thermosetting plastic can be re-used when you have finished with it. Name a synthetic fibre which is polyamide. Can you write the major difference between these two types of plastics? 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. Answer: (a) melamine Melamine is a thermosetting plastic. An excellent example is polyurethane foam. Bakelite is poor conductor of electricity. False. It can be dyed in a wide variety of colors. IV. This makes thermosetting plastics ideal for producing heat resistant products such as insulation parts, car parts, etc. Answer: Bakelite. plastic (polythene) 49. Chemistry Questions & Answers for Bank Exams : Which of the following is an example of thermosetting plastic? True. Features & Benefits. 21. 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. Answer 2 Grind the PVC coating to 5 mil before treading. False. False. Thermosetting plastics Thermosetting plastics can only be heated and shaped once. Can you write the major difference between these two types of plastics? Question 4. b. 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]. Can you write the major difference between these two types of plastics? See the answer. Question. Many small units combine to form a large single unit called a ……... . TRUE ? Nylon was also known as artificial silk in China. Thermoplasticis a plastic which gets deformed easily on heating and can be bent easily e.g., Polythene and PVC. 7. Separate polymers are joined in order to form a huge polymer. Instead, For Processing Reasons, Which Value Is Given To Designate Polymer Chain Length? A) true B) false 18. Some other examples of thermosetting polymers include a substance used to make old TV sets and certain types of strong glue. Examples – B akelite and melamine. … All Plastics, Thermoplastic Or Thermoset, Will Degrade At Some Temperature? The main physical difference is how they respond to high temperatures. 1. 3) Examples are polythene and polyvinyl chloride. ? Nylon was made in 1931. The lap seams in an EPDM roof membrane are typically sealed by. (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. Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. True. Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers. Like synthetic fibres, plastic is also a ........... Toys, carry bags, plastic bowls, electric wire. B. Thermoplastics and thermosetting plastics . If subjected to extremely high temperatures, the material may unwantedly soften, deform, and … TRUE ? Answer: False. Question 21. 5. A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. 4 Which is a thermosetting plastic? Artificial silk is another name for silk. Making fibres or terrarium, it protects us from getting electric shocks high temperatures would you expect be! 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