True or False State whether the given statements are true or false. False. False. Fill in the blanks. its fibres can also be woven like those of natural fibres. TRUE ? Heat is not necessarily to be applied externally. 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]. The lap seams in an EPDM roof membrane are typically sealed by. False EPDM is a thermosetting plastic. ? Rayon is mixed with cotton to make bedsheets or mixed with wool to make carpets. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Refuse (avoid) is the best way to manage plastic. b. Nylon is a thermoplastic polymer. Thermosetting plastics Thermosetting plastics can only be heated and shaped once. Thermosetting plastics contain polymers that cross-link together during the curing process to form an irreversible chemical bond. 4. It remains crisp, wrinkle free and easy to wash, so it is quite suitable for making dressing material. Examples of thermoplastic types are PVC (Polyvinyl Chloride) and PE (Polyethylene). Nylon is also used for making parachutes and ropes for rock climbing. True b. A) False 13. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, 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. ? 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… Can you write the major difference between these two types of plastics? Initially, the polymer is a liquid or soft solid. Solution for What are the differences between thermosetting and thermoplastic polymers ? TRUE ? B. Thermoplastics and thermosetting plastics . Urea, Ammonia nitrate and ammonium sulphate are examples of: 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. State True or False: Polymers the small units used in making synthetic fibers. They are used for electrical plugs and sockets. 3. Question 21. True Or False? Page No 44: Question 4: Which of the following is a thermosetting plastic? Some common thermoplastic materials include polyethylene (PE), polycarbonate (PC), and polyvinyl chloride (PVC). PVC (Poly vinyl chloride) and Polythene are: (A) examples of thermosetting plastics. 6. Question 41. Plastics can be easily moulded into any shape. False. 3. Thermoplastics become moldable above a specific temperature and then return back to a solid when cooled. True. False. a. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. For Any Sample Of Plastic, It Is Generally Too Costly To Count The Number Of Repeating Units On Each Of The Polymer Chains. False. 7 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. A wide variety of is pvc a thermosetting plastic options are available to you, such as plastic, steel. Give an example of linear and branched chain polymer each. 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. False EPDM is a thermosetting plastic. They are classified either as thermosetting polymers or thermoplastic polymers. Synthetic Fibres and Plastics Class 8 Extra Questions Short Answer Questions. ... EPDM and PVC, PVC is generally. These are used for manufacturing toys, combs, cargrills and various types of containers. Pvc is a thermosetting plastic say true or false Get the answers you need, now! Nylon was also known as artificial silk in China. 1M 4. Thermoplastic recycling. Whereas, the others mentioned are thermoplastics that can be moulded on heating. Hence the given statement is false. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Some other examples of thermosetting polymers include a substance used to make old TV sets and certain types of strong glue. Like synthetic fibres, plastic is also a ........... Toys, carry bags, plastic bowls, electric wire. Answer: (D) Bakelite. Plastic Bags: Cook wares: Teflon: Thermosetting: Answer. When you heat thermoplastics, the molecules do not chemically bond with each other. Question: Thermosetting Plastics Become Softer Upon Heating. 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. False. If you own a recently manufactured aquarium or terrarium, it’s likely made of acrylic plastic. Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. 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. Nylon was made in 1931. Synthetic fibres are also called ……... or …….. fibres. Answer 21. True or false? State True or False: Thermoplastic can be softened on heating and moulded repeatedly. 21. It was prepared from coal water and air. (C) PVC. Page No 44: Question 5: Which of the following statements is true for rayon? Assertion: Bakelite is a thermosetting plastic. Study 35 ET 241 Final Review flashcards from Ben B. on StudyBlue. (a) melamine (b) teflon (c) polythene (d) PVC. Plastics can be recycles, reused, colored melted, rolled into sheets or made into wires. Rayon synthesised for the first time in England. Artificial silk is another name for silk. 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. 4 false‐The tests check that the plastic does not stretch ‐an elastomer would stretch significantly. True. Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. Thermoplastics are 100% recyclable. Instead, For Processing Reasons, Which Value Is Given To Designate Polymer Chain Length? Page No 46: Question 5: Plastics are very useful materials. Synthetic Thermosetting polymers solidify into a permanent design and shape. a. Thermoplastics are 100% recyclable. D. Bakelite. True . Thermosetting Plastics: ... Q. b. Answer: Nylon. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Polythene, polystyrene, PVC, melamine and formica are plastics. False. Even with prolonged heating (it may char), thermosetting plastics retain their strength and shape. (B) examples of thermoplastics. In ideal situations, thermoplastics can be repeatedly melted and remolded into new products. Thermosetting Plastics:There are some plastics which when … Nylon, rayon, acrylic, terene and polycot are synthetic fibres. Examples – B akelite and melamine. a. Features & Benefits. Question 5. Question 20. It is a man-made fibre obtained from a natural source wood pulp. Also, bakelite is a poor conductor of electricity, hence, it protects us from getting electric shocks. A) true B) false 18. Which of two is thermosetting plastic—PVC or bakelite? False. 21. Answer. A lot of plastic pollutes our environment. Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. There are multiple thermoplastic resins that offer various performance benefits, but most materials commonly offer high strength, shrink-resistance and easy bendability. Can you write the major difference between these two types of plastics? True False QUESTION 3 PVC is a commonly recycled plastic material. Question 5. It is used with metals and thermosetting plastics. This makes thermosetting plastics ideal for producing heat resistant products such as insulation parts, car parts, etc. b. To play this quiz, please finish editing it. It was the first fully synthetic fibre. less flexible but more fire resistant. 1 true 2 true 3 false ‐The plastic is solid. (a) Melamine (b) Polythene – (c) PVC (d) Nylon Answer. 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. Question 19. If subjected to extremely high temperatures, the material may unwantedly soften, deform, and … Answer: (a) melamine Melamine is a thermosetting plastic. Such a material is also known as a thermoset or thermosetting polymer. True. True. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Thermosets usually are three-dimensional networked polymers in which there is a high degree of cross-linking between polymer chains. 3) Examples are polythene and polyvinyl chloride. Instead, thermoplastic chains are held together by van der waal forces, weak attractions between molecules. Examples of thermoset types include rubber insulations such as silicone rubbers and EVA (Ethylene-Vinyl Acetate). Say TRUE or FALSE : Chloroprene is an addition polymer of Neoprene. 22. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc. True False QUESTION 4 This process pushes material through a die to form a long contiuous shape. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. See the answer. The main thermosetting plastics are epoxy resin, melamine formaldehyde, polyester resin and urea formaldehyde. Name a synthetic fibre which is polyamide. A) true B) false 17. They may also be mixed from cold ingredients. What is High Density Polyethylene (HDPE)? Plastic Identification with the Burn Test. Heat provides energy for chemical reactions that increase the cross-linking between polymer chains, curing the plastic. Thermosetting plastic molecules, on the other hand, form permanent chemical bonds or cross links with each other once heated. Curing is induced by heat or suitable radiation and may be promoted by high pressure, or mixing with a catalyst. Question 7. All the synthetic fibres are prepared using raw materials of petroleum origin called.............. . a. Why then is there concern today about their increasing use? Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc. a. False. (B) Melamine. Polyester fibres are used for making hand knit sweaters. Play this game to review English. It is used to make many items like socks, ropes, tents, toothbrushes, car seat belts, sleeping bags, curtains etc. The raw material to make plastic is oil. PE and PVC may also be cross-linked making them thermosetting types. Hence these plastics cannot be reprocessed and they can maintain their shape and size even at very high temperatures. Answer: Bakelite. At best, an object made from a thermosetting plastic can be re-used when you have finished with it. Thermoplastic polymers can be heated and remolded for an unlimited amount of time. Synthetic fibres are synthesised from raw material called …….... . False, EPDM is a thermosetting plastic. Decide whether the following statements about thermosetting plastics are true or false. 4) PVC is a thermoplastic. Question 2. What is the difference between thermoplastic and thermosetting plastics? Question 2. Thermoset plastics are often used for sealed products due to their resistance to deformation. 3) Epoxy resin is a thermoplastic? Answer (b) non-corrosive Food items are stored in plastic containers because they are non-corrosive. A) PVC B) Polythene C) Bakelite D) None of these 19. 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. Polyester is the strongest synthetic fibre. True b. 5 true 6 false‐Material is melted down and reused, something not possible with thermosetting plastics. An excellent example is polyurethane foam. Question 3. If re-heated they cannot soften as polymer chains are interlinked. They can be melted again and again. Examples: Nylon, PVC, polystyrene, etc. Explain the difference between thermoplastic and thermosetting plastics. 5) HDPE is a tough plastic used for making toys. What is Acrylonitrile Butadiene Styrene (ABS)? Answer: Nylon. Acrylic is an artificial wool. Explain why the following are made of thermosetting plastics: (a) Saucepan handles (b) Electric plugs/switches/plug boards 6. Telephone instruments, cooker handles, ball point pens, electrical switches. Containers; Toys IV. Answer 1 Cut the PVC coating in a manner that the die will remove the coating in small pieces. All fibres are made up of very large units which in turn are made up of many small units. TRUE ? MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. 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. a. Reason: In thermosetting plastics, the polymeric chains are held together by strong covalent bonds. 3. ? This problem has been solved! Question 4. 6. false, false, true, true, true. Thermoplastics are known for their high molecular weight because intermolecular interactions increase as the plastic is cooled. The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. 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. Basil Hamed. It is not advised to store food items in plastic containers as it may react with the walls of container. T/F- PVC Sch. (a) Melamine is a thermosetting plastic which when moulded once, cannot be softened by heating. Question 6. (b) Write down the structure of monomer and… What are polymers? 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. Polymers are This quiz is incomplete! ... State whether the following statements are True or False: Question 1. 1M 5. Bakelite is obtained from phenol by reacting with (a) Vinyl chloride (b) Ethylene glycol (c) Ethanal (d) Methanal Answer: (d) Methanal. Thermoplastics are the polymers which loses their shape on heating and regain their shape on cooling. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. True. Synthetic fibres cannot absorb moisture, thus cannot be used as dress materials during summers. Can you write the major difference between these two types of plastics? (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. Many small units combine to form a large single unit called a ……... . 2) Plastic is suitable for building large and heavy structures. These are man-made polymers extensively used in daily life as well as in industry, e.g. Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. Plastic Applications. 1. 7. 21. Fill in the blanks. 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. FALSE; PVC is a thermoplastic. 22. (D) None of these. TRUE ? It can be dyed in a wide variety of colors. Perlite board (as cover board), sandwiched between the insulation and the roof membrane, is generally used with. ? B. Polythene. Which of the following is a thermosetting plastic: (a) PVC (b) nylon (c) teflon (d) bakelite. Examples are bakelite and melamine. FALSE; HDPE is a tough plastic used for making toys. A thermosetting plastic, or thermoset, solidifies or "sets" irreversibly when heated; they cannot be reshaped by heating. cure. Answer (d) bakelite Bakelite is a thermosetting plastic. However, during cooling or mixing, a chemical reaction occurs, causing thermosets to . Can you write the major difference between these two types of plastics? Which of the following does not have cross linked arrangement: (A) Bakelite. A. On the opposite of that Thermosetting doesn't regain its shape after heating. Play this game to review Chemistry. A thermosetting plastic is a polymer that irreversibly becomes rigid when heated. Bloomberg planning to double plastic, all recycling in New York City. It is good to wear clothes made of synthetic fibres while cooking. False » Questions » Engineering » Civil Engineering » Civil Engineering - Others » EPDM is a thermosetting plastic. Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. True. Question 1. 4 Which is a thermosetting plastic? Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. True or False : Question 1. Answer: True. Vinyl plastic and PVC are often the same thing. True b. Examples – Polythene and polyvinyl chloride(PVC) Thermosetting PlasticThe plastic which getsmoulded once, cannot besoftened on heating is called thermosetting plastic. Answer: (False) Correct statement: It is good to wear clothes made of fibres while cooking. 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. Question 12. 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. T/F- An expansion loop is a loop in plastic tubing and provides an area for the tubing … Answer: ... Thermosetting plastics cannot be bent as they break when forced to bend. Nylon fibres are strong elastic and light, lusturus and easy to wash. 21 PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Answer: Polymers are compounds that are made up of … T/F- An expansion loop is a loop in plastic tubing and provides an area for the tubing to expand and contract without stressing. The cross-linking restricts the motion of the chains and leads to a rigid material. Plastics are produced by condensation and addition polymerization reactions. Answer: True. Question 40. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Choose the correct answer: Example of thermosetting plastic is . Separate polymers are joined in order to form a huge polymer. plastic (polythene) 49. About 16% of these are plastic injection machines, 3% are moulds, and 1% are plastic extruders. A changed temperature [ 1 ] game to review English solidify into a permanent design and shape free and to... 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