Answer: Bakelite. Question 20. It is good to wear clothes made of synthetic fibres while cooking. (a) Melamine (b) Polythene – (c) PVC (d) Nylon Answer. Rayon is the first man-made cellulose fibre. Study 35 ET 241 Final Review flashcards from Ben B. on StudyBlue. Answer. Features & Benefits. An excellent example is polyurethane foam. Thermoplastics are 100% recyclable. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc… PE and PVC may also be cross-linked making them thermosetting types. A) PVC B) Polythene C) Bakelite D) None of these 19. 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. Rayon synthesised for the first time in England. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. plastic (polythene) 49. FALSE; Plastic is suitable for building large and heavy structures. 1. False. 7. Question 7. (D) None of these. For Any Sample Of Plastic, It Is Generally Too Costly To Count The Number Of Repeating Units On Each Of The Polymer Chains. TRUE ? It can be dyed in a wide variety of colors. Instead, thermoplastic chains are held together by van der waal forces, weak attractions between molecules. 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. Assertion: Bakelite is a thermosetting plastic. D. Bakelite. Acrylic – Acrylic is commonly used for consumer goods. Examples – B akelite and melamine. A. (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. False. The raw material to make plastic is oil. ? B) True 14. b. (C) PVC. Urea, Ammonia nitrate and ammonium sulphate are examples of: Nylon was also known as artificial silk in China. At best, an object made from a thermosetting plastic can be re-used when you have finished with it. Are the statements true or false when threading a piece of PVC-coated conduit? T/F- PVC Sch. Examples – Polythene and polyvinyl chloride(PVC) Thermosetting PlasticThe plastic which getsmoulded once, cannot besoftened on heating is called thermosetting plastic. Question 6. Thermosetting plastics, also called . 4. It is a man-made fibre obtained from a natural source wood pulp. b. 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. FALSE; PVC is a thermoplastic. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. 5. Bloomberg planning to double plastic, all recycling in New York City. ? Question. Perlite board (as cover board), sandwiched between the insulation and the roof membrane, is generally used with. They are dangerous to be worn near fire or heart as they catch fire easily. Reason: In thermosetting plastics, the polymeric chains are held together by strong covalent bonds. A) False 13. Thermoplasticis a plastic which gets deformed easily on heating and can be bent easily e.g., Polythene and PVC. True. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. 5. 22. Heat is not necessarily to be applied externally. Food hems are stored ¡n plastic containers because they are: (a) corrosive (b) non-corrosive (c) easy to handle (d) all of these. 1 true 2 true 3 false ‐The plastic is solid. Explain the difference between thermoplastic and thermosetting plastics. Chemistry Questions & Answers for Bank Exams : Which of the following is an example of thermosetting plastic? Instead, For Processing Reasons, Which Value Is Given To Designate Polymer Chain Length? Question 13. Nylon was made in 1931. a. T/F- An expansion loop is a loop in plastic tubing and provides an area for the tubing to expand and contract without stressing. True. Can you write the major difference between these two types of plastics? Hence the given statement is false. A) true B) false 17. 1M 5. (a) melamine (b) teflon (c) polythene (d) PVC. Nylon fibres are strong elastic and light, lusturus and easy to wash. Page No 44: Question 4: Which of the following is a thermosetting plastic? PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. 1M 4. 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. Thermoplastics become moldable above a specific temperature and then return back to a solid when cooled. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. In ideal situations, thermoplastics can be repeatedly melted and remolded into new products. Answer: Nylon. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Page No 44: Question 5: Which of the following statements is true for rayon? thermosets, can be heated and mouldedlike thermoplastics. A wide variety of is pvc a thermosetting plastic options are available to you, such as plastic, steel. Bitumen-treated fiberglass felt. Whereas, the others mentioned are thermoplastics that can be moulded on heating. True False QUESTION 4 This process pushes material through a die to form a long contiuous shape. b. Give an example of linear and branched chain polymer each. Rayon is mixed with cotton to make bedsheets or mixed with wool to make carpets. Say TRUE or FALSE : Chloroprene is an addition polymer of Neoprene. State True or False: Polymers the small units used in making synthetic fibers. Flexible polyurethane foams are commonly shredded into small flakes and re-manufactured into carpet underpayment. It was prepared from coal water and air. Answer 2 Grind the PVC coating to 5 mil before treading. Examples: Nylon, PVC, polystyrene, etc. Polyester is the strongest synthetic fibre. Answer: (D) Bakelite. False EPDM is a thermosetting plastic. Hence these plastics cannot be reprocessed and they can maintain their shape and size even at very high temperatures. Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. Can you write the major difference between these two types of plastics? However, like any other material, thermoplastics have their limitations. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. a. Examples of thermosetting plastics include phenolic resins, amino resins, polyester resins, silicon resins, epoxy resins, and polyurethanes. TRUE ? Thermoplastics are the polymers which loses their shape on heating and regain their shape on cooling. The cross-linking restricts the motion of the chains and leads to a rigid material. 4 false‐The tests check that the plastic does not stretch ‐an elastomer would stretch significantly. 21. Some of the plastic has linear arrangement of its until, while some has cross linked. Like synthetic fibres, plastic is also a ........... Toys, carry bags, plastic bowls, electric wire. 3. Thermosetting plastics become softer upon heating. ? Examples of thermoset types include rubber insulations such as silicone rubbers and EVA (Ethylene-Vinyl Acetate). Thermosetting Plastics: ... Q. Answer. 4) PVC is a thermoplastic. (C) examples of natural substances. 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? cure. Question 19. Answer 1 Cut the PVC coating in a manner that the die will remove the coating in small pieces. It can't be recycled. TRUE ? True. Plastic Bags: Cook wares: Teflon: Thermosetting: Answer. Fill in the blanks. Answer 21. 21 PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Plastics are produced by condensation and addition polymerization reactions. 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. Can you write the major difference between these two types of plastics? Question 5. Nylon is a thermoplastic polymer. Nylon was also known as artificial silk in China. They are classified either as thermosetting polymers or thermoplastic polymers. Rayon is a natural fibre. The lap seams in an EPDM roof membrane are typically sealed by. (a) Melamine is a thermosetting plastic which when moulded once, cannot be softened by heating. Some other examples of thermosetting polymers include a substance used to make old TV sets and certain types of strong glue. TRUE ? Thermoplastic recycling. True b. Synthetic Fibres and Plastics Class 8 Extra Questions Short Answer Questions. Play this game to review Chemistry. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc. If re-heated they cannot soften as polymer chains are interlinked. FALSE; HDPE is a tough plastic used for making toys. 3) Epoxy resin is a thermoplastic? About 16% of these are plastic injection machines, 3% are moulds, and 1% are plastic extruders. Curing is induced by heat or suitable radiation and may be promoted by high pressure, or mixing with a catalyst. Such a material is also known as a thermoset or thermosetting polymer. Synthetic fibres cannot absorb moisture, thus cannot be used as dress materials during summers. Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. 21. Synthetic Polyester fibres are used for making hand knit sweaters. Polyvinyl chloride (PVC) is considered a thermoplastic. Answer (b) non-corrosive Food items are stored in plastic containers because they are non-corrosive. Which of the following is a thermosetting plastic: (a) PVC (b) nylon (c) teflon (d) bakelite. Also, bakelite is a poor conductor of electricity, hence, it protects us from getting electric shocks. Play this game to review English. Which one of the following is an example of a biode-gradable polyester (a) PHBV (b) PET (c) Nylon (d) Bakelite Answer: (a) PHBV. True. … Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. True . Fill in the blanks. Some common thermoplastic materials include polyethylene (PE), polycarbonate (PC), and polyvinyl chloride (PVC). b. 21. Answer: Nylon. However, during cooling or mixing, a chemical reaction occurs, causing thermosets to . PVC can be made either as a flexible plastic or a rigid plastic by means of additives. TRUE ? its fibres can also be woven like those of natural fibres. Fill in the blanks. 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. It is used to make many items like socks, ropes, tents, toothbrushes, car seat belts, sleeping bags, curtains etc. Justify each choice. 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. 5 The material similar to silk in appearance is (a) nylon (b) rayon (c) polyester (d) terylene Answer. Many small units combine to form a large single unit called a ……... . Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. True b. 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. True. ... EPDM and PVC, PVC is generally. Examples are bakelite and melamine. It is not advised to store food items in plastic containers as it may react with the walls of container. Give the name of a plastic used for making fibres. Pencil or bevel cut the PVC coating at the end of the conduit. See the answer. Plastic Applications. Question: True Or False. Examples of thermoplastic types are PVC (Polyvinyl Chloride) and PE (Polyethylene). Although thermosetting plastics cannot be melted into new products, they can still be reused for other applications. Question. 22. A) true B) false 20. False. Polymers are This quiz is incomplete! A thermosetting plastic, or thermoset, solidifies or "sets" irreversibly when heated; they cannot be reshaped by heating. The main thermosetting plastics are epoxy resin, melamine formaldehyde, polyester resin and urea formaldehyde. Question 40. Visually speaking, thermoplastic chains are clumped together like a ball of tangled yarn. Heat provides energy for chemical reactions that increase the cross-linking between polymer chains, curing the plastic. What is the difference between thermoplastic and thermosetting plastics? Containers; Toys b. False, EPDM is a thermosetting plastic. Answer: True. Plastics can be recycles, reused, colored melted, rolled into sheets or made into wires. Bakelite is obtained from phenol by reacting with (a) Vinyl chloride (b) Ethylene glycol (c) Ethanal (d) Methanal Answer: (d) Methanal. less flexible but more fire resistant. False EPDM is a thermosetting plastic. a. Question 3. Thermoplastics are known for their high molecular weight because intermolecular interactions increase as the plastic is cooled. (b) Write down the structure of monomer and… Thermosetting plastics contain polymers that cross-link together during the curing process to form an irreversible chemical bond. True. False. ... EPDM is a thermosetting plastic. Question: Thermosetting Plastics Become Softer Upon Heating. Answer (d) bakelite Bakelite is a thermosetting plastic. A lot of plastic pollutes our environment. Decide whether the following statements about thermosetting plastics are true or false. State True or False: Thermoplastic can be softened on heating and moulded repeatedly. Answer 21. To play this quiz, please finish editing it. Acrylic is an artificial wool. Question 21. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Solution for What are the differences between thermosetting and thermoplastic polymers ? 6. false, false, true, true, true. 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. All Plastics, Thermoplastic Or Thermoset, Will Degrade At Some Temperature? Refuse (avoid) is the best way to manage plastic. 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. Question 1. 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. Thermosetting polymers solidify into a permanent design and shape. Answer: Polymers are compounds that are made up of … 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. 5 true 6 false‐Material is melted down and reused, something not possible with thermosetting plastics. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. 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. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc. Answer. 4 Which is a thermosetting plastic? Can you write the major difference between these two types of plastics? Which of two is thermosetting plastic—PVC or bakelite? Can you write the major difference between these two types of plastics? A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers. Sample Density B. Answer: (False) Correct statement: It is good to wear clothes made of fibres while cooking. A) true B) false 18. This makes thermosetting plastics ideal for producing heat resistant products such as insulation parts, car parts, etc. PVC (Poly vinyl chloride) and Polythene are: (A) examples of thermosetting plastics. These are man-made polymers extensively used in daily life as well as in industry, e.g. Question 2. True. Initially, the polymer is a liquid or soft solid. Thermoplastic polymers can be heated and remolded for an unlimited amount of time. Answer: ... Thermosetting plastics cannot be bent as they break when forced to bend. (B) examples of thermoplastics. It was the first fully synthetic fibre. True or False : Question 1. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Alibaba.com offers 571 is pvc a thermosetting plastic products. Question 4. a. Artificial silk is another name for silk. PVC is polyvinyl chloride and it is a type of vinyl polymer. True Or False? Bakelite is poor conductor of electricity. Name a synthetic fibre which is polyamide. PVC (polyvinylchloride) -a cheaper plastic used for window frames and pipes. Which of the following does not have cross linked arrangement: (A) Bakelite. If you own a recently manufactured aquarium or terrarium, it’s likely made of acrylic plastic. a. Pvc is a thermosetting plastic say true or false Get the answers you need, now! 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