False. Nylon is also used for making parachutes and ropes for rock climbing. Thermoset plastics are often used for sealed products due to their resistance to deformation. 4) PVC is a thermoplastic. They may also be mixed from cold ingredients. a. B. Polythene. True or false? Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. However, like any other material, thermoplastics have their limitations. Separate polymers are joined in order to form a huge polymer. False. Can you write the major difference between these two types of plastics? Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Answer: Nylon. Question 4. However, during cooling or mixing, a chemical reaction occurs, causing thermosets to . Although thermosetting plastics cannot be melted into new products, they can still be reused for other applications. A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. False. Answer 21. 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. Question. 3) Examples are polythene and polyvinyl chloride. If re-heated they cannot soften as polymer chains are interlinked. Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers. Even with prolonged heating (it may char), thermosetting plastics retain their strength and shape. 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]. Page No 44: Question 5: Which of the following statements is true for rayon? 5. A) true B) false 20. 5 The material similar to silk in appearance is (a) nylon (b) rayon (c) polyester (d) terylene Answer. Question 12. 1. Polyester fibres are used for making hand knit sweaters. Answer: Bakelite. 1M 4. 6. false, false, true, true, true. It is good to wear clothes made of synthetic fibres while cooking. Question 41. 22. Answer. In ideal situations, thermoplastics can be repeatedly melted and remolded into new products. All Plastics, Thermoplastic Or Thermoset, Will Degrade At Some Temperature? Artificial silk is another name for silk. TRUE ? Justify each choice. Which one of the following is an example of a biode-gradable polyester (a) PHBV (b) PET (c) Nylon (d) Bakelite Answer: (a) PHBV. Bloomberg planning to double plastic, all recycling in New York City. 2) Plastic is suitable for building large and heavy structures. 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. The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. Play this game to review English. Question 3. 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? 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. Page No 46: Question 5: Plastics are very useful materials. A) PVC B) Polythene C) Bakelite D) None of these 19. b. See the answer. Sample Density B. Page No 44: Question 4: Which of the following is a thermosetting plastic? Polymers are This quiz is incomplete! Give an example of linear and branched chain polymer each. PVC (polyvinylchloride) -a cheaper plastic used for window frames and pipes. Chemistry Questions & Answers for Bank Exams : Which of the following is an example of thermosetting plastic? PVC is polyvinyl chloride and it is a type of vinyl polymer. cure. 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. Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. Question: Thermosetting Plastics Become Softer Upon Heating. It is a man-made fibre obtained from a natural source wood pulp. Instead, thermoplastic chains are held together by van der waal forces, weak attractions between molecules. Question 7. Rayon is mixed with cotton to make bedsheets or mixed with wool to make carpets. b. If you own a recently manufactured aquarium or terrarium, it’s likely made of acrylic plastic. To play this quiz, please finish editing it. 21. 3. Once formed, it can be heated and reformed over and over again (B) Melamine. 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. 5 true 6 false‐Material is melted down and reused, something not possible with thermosetting plastics. A thermosetting plastic is a polymer that irreversibly becomes rigid when heated. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Refuse (avoid) is the best way to manage plastic. True b. PE and PVC may also be cross-linked making them thermosetting types. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. ... State whether the following statements are True or False: Question 1. Can you write the major difference between these two types of plastics? Polyvinyl chloride (PVC) is considered a thermoplastic. Plastics are produced by condensation and addition polymerization reactions. They are classified either as thermosetting polymers or thermoplastic polymers. Question 1. (C) PVC. Which plastic is used to laminate kitchen worktops? (D) examples of heavy fibers. Bakelite is poor conductor of electricity. b. Many small units combine to form a large single unit called a ……... . PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. All fibres are made up of very large units which in turn are made up of many small units. It remains crisp, wrinkle free and easy to wash, so it is quite suitable for making dressing material. Synthetic Fibres and Plastics Class 8 Extra Questions Short Answer Questions. True b. 1M 5. Plastic Applications. A) true B) false 17. Give the name of a plastic used for making fibres. The main thermosetting plastics are epoxy resin, melamine formaldehyde, polyester resin and urea formaldehyde. True. A. Thermosetting plastics become softer upon heating. False EPDM is a thermosetting plastic. a. It is used to make many items like socks, ropes, tents, toothbrushes, car seat belts, sleeping bags, curtains etc. Question 19. 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. True. True. a. Explain why the following are made of thermosetting plastics: (a) Saucepan handles (b) Electric plugs/switches/plug boards 6. Nylon fibres are strong elastic and light, lusturus and easy to wash. a. ... EPDM is a thermosetting plastic. Answer: Polymers are compounds that are made up of … 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. Thermosetting plastics contain polymers that cross-link together during the curing process to form an irreversible chemical bond. Plastic Identification with the Burn Test. What is Acrylonitrile Butadiene Styrene (ABS)? Bitumen-treated fiberglass felt. Polyester is the strongest synthetic fibre. ? 5. True. Thermosetting Plastics:There are some plastics which when … Answer: Nylon. Answer: False. Name a synthetic fibre which is polyamide. Can you write the major difference between these two types of plastics? 3. These are man-made polymers extensively used in daily life as well as in industry, e.g. False. a. Examples: Nylon, PVC, polystyrene, etc. True False QUESTION 4 This process pushes material through a die to form a long contiuous shape. (a) Melamine (b) Polythene – (c) PVC (d) Nylon Answer. When you heat thermoplastics, the molecules do not chemically bond with each other. What is High Density Polyethylene (HDPE)? 2. Choose the correct answer: Example of thermosetting plastic is . The raw material to make plastic is oil. Question 2. ? Such a material is also known as a thermoset or thermosetting polymer. The cross-linking restricts the motion of the chains and leads to a rigid material. FALSE; HDPE is a tough plastic used for making toys. Examples of thermoset types include rubber insulations such as silicone rubbers and EVA (Ethylene-Vinyl Acetate). Answer 21. (D) None of these. Like synthetic fibres, plastic is also a ........... Toys, carry bags, plastic bowls, electric wire. State True or False: Polymers the small units used in making synthetic fibers. False. 3. Answer: (False) Correct statement: It is good to wear clothes made of fibres while cooking. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Answer: ... Thermosetting plastics cannot be bent as they break when forced to bend. Explain the difference between thermoplastic and thermosetting plastics. Question 21. It can be dyed in a wide variety of colors. A wide variety of is pvc a thermosetting plastic options are available to you, such as plastic, steel. A) true B) false 18. 6. True. Thermoplastic recycling. This problem has been solved! Rayon is a natural fibre. B) True 14. False. False EPDM is a thermosetting plastic. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Rayon is the first man-made cellulose fibre. Answer: (a) melamine Melamine is a thermosetting plastic. True or False State whether the given statements are true or false. Play this game to review Chemistry. 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. On the opposite of that Thermosetting doesn't regain its shape after heating. Thermosetting plastics Thermosetting plastics can only be heated and shaped once. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. False, EPDM is a thermosetting plastic. Examples of thermosetting plastics include phenolic resins, amino resins, polyester resins, silicon resins, epoxy resins, and polyurethanes. A thermosetting plastic, or thermoset, solidifies or "sets" irreversibly when heated; they cannot be reshaped by heating. D. Bakelite. Answer (d) bakelite Bakelite is a thermosetting plastic. Decide whether the following statements about thermosetting plastics are true or false. Pencil or bevel cut the PVC coating at the end of the conduit. All the synthetic fibres are prepared using raw materials of petroleum origin called.............. . Thermoplastics are the polymers which loses their shape on heating and regain their shape on cooling. Fill in the blanks. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Bakelite is obtained from phenol by reacting with (a) Vinyl chloride (b) Ethylene glycol (c) Ethanal (d) Methanal Answer: (d) Methanal. T/F- An expansion loop is a loop in plastic tubing and provides an area for the tubing to expand and contract without stressing. Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. Acrylic – Acrylic is commonly used for consumer goods. These are used for manufacturing toys, combs, cargrills and various types of containers. b. … Instead, thermoplastic chains are held together by van der waal forces, weak attractions between molecules. It was the first fully synthetic fibre. Thermosetting plastics, also called . False. 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. 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. Thermoplastics are known for their high molecular weight because intermolecular interactions increase as the plastic is cooled. ? It can't be recycled. thermosets, can be heated and mouldedlike thermoplastics. Features & Benefits. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. True. (a) Melamine is a thermosetting plastic which when moulded once, cannot be softened by heating. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Fill in the blanks. 22. A. PVC. 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. a. Epoxy resin. Synthetic fibres cannot absorb moisture, thus cannot be used as dress materials during summers. Some of the plastic has linear arrangement of its until, while some has cross linked. 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. 7. a. Answer. Examples – Polythene and polyvinyl chloride(PVC) Thermosetting PlasticThe plastic which getsmoulded once, cannot besoftened on heating is called thermosetting plastic. Heat provides energy for chemical reactions that increase the cross-linking between polymer chains, curing the plastic. Nylon is a thermoplastic polymer. Can you write the major difference between these two types of plastics? Why then is there concern today about their increasing use? Answer: True. Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Thermoplasticis a plastic which gets deformed easily on heating and can be bent easily e.g., Polythene and PVC. A lot of plastic pollutes our environment. True. 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. 21. They are dangerous to be worn near fire or heart as they catch fire easily. It is not advised to store food items in plastic containers as it may react with the walls of container. Urea, Ammonia nitrate and ammonium sulphate are examples of: Whereas, the others mentioned are thermoplastics that can be moulded on heating. Can you write the major difference between these two types of plastics? Thermosetting Plastics: ... Q. PVC can be made either as a flexible plastic or a rigid plastic by means of additives. Say TRUE or FALSE : Chloroprene is an addition polymer of Neoprene. IV. Plastic Bags: Cook wares: Teflon: Thermosetting: Answer. True False QUESTION 3 PVC is a commonly recycled plastic material. Some other examples of thermosetting polymers include a substance used to make old TV sets and certain types of strong glue. ... EPDM and PVC, PVC is generally. Study 35 ET 241 Final Review flashcards from Ben B. on StudyBlue. Question 20. 22. T/F- An expansion loop is a loop in plastic tubing and provides an area for the tubing … Plastics can be recycles, reused, colored melted, rolled into sheets or made into wires. Heat is not necessarily to be applied externally. Fill in the blanks. Answer (b) non-corrosive Food items are stored in plastic containers because they are non-corrosive. (C) examples of natural substances. Question 6. Polythene, polystyrene, PVC, melamine and formica are plastics. Examples of thermoplastic types are PVC (Polyvinyl Chloride) and PE (Polyethylene). Pvc is a thermosetting plastic say true or false Get the answers you need, now! Question 40. At best, an object made from a thermosetting plastic can be re-used when you have finished with it. This makes thermosetting plastics ideal for producing heat resistant products such as insulation parts, car parts, etc. Hence these plastics cannot be reprocessed and they can maintain their shape and size even at very high temperatures. 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? T/F- PVC Sch. b. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc. C. PET. 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. Acrylic is an artificial wool. Telephone instruments, cooker handles, ball point pens, electrical switches. Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. 7. Question 5. 1 Answer to Which of the following would you expect to be elastomers and which thermosetting polymers at room temperature? plastic (polythene) 49. Initially, the polymer is a liquid or soft solid. Nylon, rayon, acrylic, terene and polycot are synthetic fibres. FALSE; Plastic is suitable for building large and heavy structures. Give one example of each. True or False : Question 1. True. 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. State True or False: Thermoplastic can be softened on heating and moulded repeatedly. Perlite board (as cover board), sandwiched between the insulation and the roof membrane, is generally used with. 1 true 2 true 3 false ‐The plastic is solid. Containers; Toys Nylon was also known as artificial silk in China. 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. 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