The fabric tery wool is obtained by mixing terylene and wool. Thermoplastic softens on heating and then can be moulded into various shapes. Answer/Explanation. Nylon is a thermoplastic silky material [1] that can be melt-processed into fibers, films, or shapes. A full revision with question-answer and explanation in the form of MCQs based on latest CBSE Syllabus for new academic session 2020-2021. TRUE ? true or false In an addition polymerization reaction the polymer is the sole product true or false Thermoplastic polymers may be converted into thermosetting polymers. A acrylic B. It is a runny liquid that can be processed to make latex gloves, erasers, and party balloons. Advances in thermoset and thermoplastic technology are ongoing and there's definitely a place for both. It is risky to wear synthetic clothes while working in the kitchen. Rayon is (a) natural silk (b) artificial silk (c) natural rubber (d) synthetic plastic. Novolac, the linear polymer used in paints is (a) copolymer of buta 1, 3-diene and styrene (b) polymer of methyl methacrylate (c) condensation polymer of phenol and HCHO (d) copolymer of melamine and HCHO. (True or False) c) Most polymers used in 3D printing applications are thermoplastic (True or False) ... Thermoplastic polymer _____ _____ harden permanently when formed and cannot be softened by head and remolded. Polyester fibres are used for making hand knit sweaters. Novolac, a condensation polymer of phenol and formaldehyde is a thermosetting polymer. Question 46. Volker Altstädt stehen im Brand "Polymer Engineering" drei kompetente Institutionen zusammen: der Lehrstuhl Polymere Werkstoffe der Universität Bayreuth, der Geschäftsbereich Kunststoffe der Neue Materialien Bayreuth GmbH und die Abteilung Polymer Engineering der TuTech Innovation GmbH in Hamburg. Melamine plastic or melamine formaldehyde is a hard, thermoset plastic material made from melamine and formaldehyde by polymerization. true or false ? Answer. Rubber tapped from para rubber trees is a polymer of isoprene monomers. 1. A good example of a thermosetting polymer is vulcanized rubber. D. D Bakelite. FALSE; Plastic is suitable for building large and heavy structures. Different types of synthetic fibres like, Rayon fibres, Nylon fibres, Polyester fibres and Acrylic fibres have been explained. Answer: True. Question 6. A. (e) Assertion is false but Reason is correct. 6) Which of the following is commonly used in schools for vacuum forming? a. B. b. Polyester. Assertion (A): Rayon is a semi-synthetic polymer and is taken as a better choice than cotton fabric. Strong heat causes these polymers to discolor and decompose. Unter der Leitung von Prof. Dr.-Ing. ? Polyethylene, or PE, is a polymer composed of chains of ethylene units.... See full answer below. 50. Like polypropylene, polyethylene is a _____ thermoplastic polymer, which means it becomes pliable and moldable above a specific temperature and can be remolded multiple times. A polymer plastic which cures irreversibly is called a thermosetting plastic. HIPS ? Small molecules that make up larger molecules. (ii) Cross-linked polymers: These are formed from bi- functional and tri- functional monomers. The presence of crosslinks hardens the overall structure. State whether the statements given below are True or False’. False. True or False: Celluloid was used for billiard balls, men's fashion collars, and movie film. FALSE; Epoxy resin is a thermoplastic? Synthetic fibre do not melt on heating. Melamine / ˈ m ɛ l ə m iː n / is an organic compound with the formula C 3 H 6 N 6.This white solid is a trimer of cyanamide, with a 1,3,5-triazine skeleton. (ii) Branched chain polymers: These polymers contain linear chains having some branches. 1) Answer True or False for the following questions. (c) Both Assertion and Reason are false. (d) Assertion is correct but Reason is false. Elastomer = possesses elasticity. [CBSE AIPMT 2012] A. They are classified either as thermosetting polymers or thermoplastic polymers. a. (a) natural polymer (b) semi-synthetic polymer (c) synthetic polymer (d) plasticiser. 6. Answer: c Explaination: (c) It … [2]:2 It is made of repeating units linked by amide links [3] similar to the peptide bonds in proteins. TRUE ? A true B. All polymers made from polyethylene will have the same density. TRUE ? The key difference between thermoplastic and thermoset is that thermoplastic can be melted into any shape and re-used whereas thermosets have a permanent shape and cannot be recycled into new forms of plastic.. Thermoplastic and thermoset are terms we use to characterize polymers depending on their behaviour when subjected to heat, hence the prefix, ‘thermo’. TRUE ? B epoxy C. C melamine. Plastic is suitable for building large and heavy structures. Nylon is a thermoplastic polymer. High-density polyethylene or HDPE is a thermoplastic polymer used in the production of plastic bottles, containers, corrosion-resistant pipes, etc. D. Glyptal. 25 State whether the following statements are True/False. 4) PVC is a thermoplastic. ... Rubber is a linear polymer. The polymer melmac is obtained by 1) Addition polymerization of melamine and formaldehyde 2) Condensation of polymerization of melamine and formaldehyde 3) Coordination polymerization of melamine 4) Free-radical polymerization of tetrafluroethylene 52. Die Schwerpunkte der Forschung liegen auf … The key difference between polymers and plastics is that plastic is a specific type of polymer. FALSE; HDPE is a tough plastic used for making toys. Reason (R): Mechanical and aesthetic properties of cellulose can be improved by acetylation. ? Such as polythene, polyvinyl chloride etc. Class 8 Science Chapter 3 MCQ (Multiple Choice Questions) of Synthetic Fibres and Plastic. ... like molecule consisting of a large number of simple small molecules joined to each other by chemical bonds is called polymer. 7 Which of the following is the chemically inert to organic solvents? Nylon was also known as artificial silk in China. It can cure because of heating, owing to a chemical reaction, or following irradiation like processing by means of electronic beams. a. The present strategy of the company is to become a reliable global multiproduct player able to offer a wide range of effective flame retardants, based on different […] Thermoplastic = can be melted and re-formed. (i) Linear polymer: These polymers consist of long and straight chains. FALSE; PVC is a thermoplastic. B false. 17.Which kinds of materials are used in civil structures? Plastics are comprised of a long chain of polymers, where polymers are composed of smaller, uniform molecules. a. PVC. No. On the opposite of that Thermosetting doesn't regain its shape after heating. 7. False. Play this game to review English. ... Melamine is (a) thermoplastic polymer (b) thermosetting polymer (c) fibre (d) elastomer. Which one of the following is not a condensation polymer? The assertion is true but the reason is false. 6 Which of the following is the thermoplastic material? ? Such as low density polythene. There are many types, varying from very slow to very fast curing. NCERT Class 12 Chemistry Exemplar for Chapter 15 Polymers provide you polymer questions multiple choice, polymer MCQ for NEET, Fill in the blanks, Match the following, True or False, Worksheets, polymers Class 12 important questions, exercises and assignments. (a) Rayon (b) Polymer (c) Terylene (d) Plastic (e) Polyester (f) Teflon. True. b. TRUE ? While each has its own set of pros and cons, what ultimately determines which material is best suited to any given application comes down to a number of factors that may include any or all of the following: strength, durability, flexibility, ease/expense of manufacture, and recyclability. A. C. Melamine. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) b. FALSE. Indicate whether each statement is true or false:(a) Elastomers are rubbery solids. False. True. 5) HDPE is a tough plastic used for making toys. B. Neoprene. Examples: Nylon, PVC, polystyrene, etc. False. A true B. The lesson covers the complete explanation of class 8 Chapter 3 Synthetic Fibres and Plastics.Topics covered are Introduction to fibres, kinds of fibres. Like cyanamide, it contains 67% nitrogen by mass, and its derivatives have fire retardant properties due to its release of nitrogen gas when burned or charred. Which of the following statements is false? Once formed, it can be heated and reformed over and over again (c) Thermoplastic polymers can … Italmatch Chemicals manufacture and develop Phosphorus and Nitrogen based Flame Retardant Additive in many polymer applications, mainly for thermoplastic polymers but also for thermoset and carpet backing applications. (b) Thermosets cannot be reshaped. True. Commercially ... Melamine is a versatile material which resists the spread of fire. When small amounts of noxious material is added to ethanol, it becomes unfit for drinking and is known as natured alcohol. ? As with most rubbers, neoprene is an elastomer. 17. True. b. The repeat unit in natural rubber is isoprene. Melamine (MF) ? [CBSE AIPMT 2012] A. Dacron. B false. 2. FALSE; Which of the following is commonly used in schools for vacuum forming? a) A branched polymer will have more ductility than a cross-linked polymer (True or False) b) Unlike metals, most thermoplastic polymers are not fully crystalline. Play this game to review Chemical Bonds. b. True or False? True. Question 2. 23. Synthetic Fibres and Plastics Class 8 Science Chapter 3 as per NCERT Book used in CBSE and other Schools. while nylon-6,6 is a polyamide which is commonly known as fibre. Before the thermosetting plastic cures it is malleable and can be moulded into different forms, or used as an adhesive. Answer. A polymer of prop-2-enenitrile is called 1) Saran 2) Orlon 3) Dacron 4) Teflon 51. (a) Polymer viscosity increases as .Polymer molecular weight increases (b) Adding a good solvent can reduce polymer viscosity (c) Polymer viscosity decreases as temperature decreases (d) Coating viscosity begins to increase after application, as the solvent begins to evaporate. 14. Note that the monomeric units that make up the polymer are not identical with the starting components. Long Answer Type Questions Question. Neoprene rubber are thermoplastic polymers. Semi Crystalline PE is a family member of a broader group known as _______________; which also includes Polypropylene. melamine polymer thermoset thermoplastic mole percent Prior art date 1999-09-29 Legal status (The legal status is an assumption and is not a legal conclusion. Question 7. ... State whether the following statements are True or False: Question 1. All fibres are made up of very large units which in turn are made up of many small units. But Reason is correct but Reason is false but Reason is correct difference between polymers and plastics that... In thermoset and thermoplastic technology are ongoing and there 's definitely a place for both tapped. Thermoplastic polymers between polymers and plastics class 8 Chapter 3 synthetic fibres and Plastics.Topics covered Introduction... 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Of MCQs based on latest CBSE Syllabus for new academic session 2020-2021 to the accuracy of the following is known!