a. Plastic is suitable for building large and heavy structures. [CBSE AIPMT 2012] A. Dacron. True. ... Thermoplastic polymer _____ _____ harden permanently when formed and cannot be softened by head and remolded. B. ... Rubber is a linear polymer. They are classified either as thermosetting polymers or thermoplastic polymers. Strong heat causes these polymers to discolor and decompose. 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. Question 6. Nylon was also known as artificial silk in China. True. Neoprene rubber are thermoplastic polymers. Class 8 Science Chapter 3 MCQ (Multiple Choice Questions) of Synthetic Fibres and Plastic. 2. A good example of a thermosetting polymer is vulcanized rubber. A true B. Reason (R): Mechanical and aesthetic properties of cellulose can be improved by acetylation. FALSE. The key difference between polymers and plastics is that plastic is a specific type of polymer. Which of the following statements is false? 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. Novolac, a condensation polymer of phenol and formaldehyde is a thermosetting polymer. HIPS ? False. B false. ... Melamine is (a) thermoplastic polymer (b) thermosetting polymer (c) fibre (d) elastomer. TRUE ? a. PVC. 17.Which kinds of materials are used in civil structures? a. A acrylic B. 6 Which of the following is the thermoplastic material? TRUE ? 6) Which of the following is commonly used in schools for vacuum forming? B. Neoprene. Such as low density polythene. Answer. Question 2. ... State whether the following statements are True or False: Question 1. Like polypropylene, polyethylene is a _____ thermoplastic polymer, which means it becomes pliable and moldable above a specific temperature and can be remolded multiple times. FALSE; Epoxy resin is a thermoplastic? 1. FALSE; PVC is a thermoplastic. 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. [2]:2 It is made of repeating units linked by amide links [3] similar to the peptide bonds in proteins. Answer. Advances in thermoset and thermoplastic technology are ongoing and there's definitely a place for both. Different types of synthetic fibres like, Rayon fibres, Nylon fibres, Polyester fibres and Acrylic fibres have been explained. Play this game to review English. FALSE; Plastic is suitable for building large and heavy structures. (i) Linear polymer: These polymers consist of long and straight chains. Play this game to review Chemical Bonds. Melamine (MF) ? (e) Assertion is false but Reason is correct. Such as polythene, polyvinyl chloride etc. 14. The fabric tery wool is obtained by mixing terylene and wool. The assertion is true but the reason is false. 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 […] All fibres are made up of very large units which in turn are made up of many small units. (d) Assertion is correct but Reason is false. 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. The repeat unit in natural rubber is isoprene. Examples: Nylon, PVC, polystyrene, etc. C. Melamine. A. True. a. Question 46. B epoxy C. C melamine. Which one of the following is not a condensation polymer? The presence of crosslinks hardens the overall structure. Small molecules that make up larger molecules. 25 State whether the following statements are True/False. 4) PVC is a thermoplastic. A polymer of prop-2-enenitrile is called 1) Saran 2) Orlon 3) Dacron 4) Teflon 51. ? False. (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. FALSE; HDPE is a tough plastic used for making toys. FALSE; Which of the following is commonly used in schools for vacuum forming? b. High-density polyethylene or HDPE is a thermoplastic polymer used in the production of plastic bottles, containers, corrosion-resistant pipes, etc. 5) HDPE is a tough plastic used for making toys. Assertion (A): Rayon is a semi-synthetic polymer and is taken as a better choice than cotton fabric. (a) Rayon (b) Polymer (c) Terylene (d) Plastic (e) Polyester (f) Teflon. Note that the monomeric units that make up the polymer are not identical with the starting components. [CBSE AIPMT 2012] A. 17. TRUE ? It is a runny liquid that can be processed to make latex gloves, erasers, and party balloons. (c) Both Assertion and Reason are false. True. ? Nylon is a thermoplastic polymer. A. 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. Polyethylene, or PE, is a polymer composed of chains of ethylene units.... See full answer below. Synthetic Fibres and Plastics Class 8 Science Chapter 3 as per NCERT Book used in CBSE and other Schools. D. D Bakelite. Unter der Leitung von Prof. Dr.-Ing. TRUE ? Indicate whether each statement is true or false:(a) Elastomers are rubbery solids. True. ? Commercially ... Melamine is a versatile material which resists the spread of fire. 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’. It is risky to wear synthetic clothes while working in the kitchen. ... like molecule consisting of a large number of simple small molecules joined to each other by chemical bonds is called polymer. B false. As with most rubbers, neoprene is an elastomer. 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. It can cure because of heating, owing to a chemical reaction, or following irradiation like processing by means of electronic beams. (ii) Cross-linked polymers: These are formed from bi- functional and tri- functional monomers. Answer: c Explaination: (c) It … 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. True or False? Long Answer Type Questions Question. 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. Answer: True. Nylon is a thermoplastic silky material [1] that can be melt-processed into fibers, films, or shapes. ? 6. b. Polyester. 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. A full revision with question-answer and explanation in the form of MCQs based on latest CBSE Syllabus for new academic session 2020-2021. False. Synthetic fibre do not melt on heating. Before the thermosetting plastic cures it is malleable and can be moulded into different forms, or used as an adhesive. b. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) False. (ii) Branched chain polymers: These polymers contain linear chains having some branches. D. Glyptal. State whether the statements given below are True or False’. 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. Elastomer = possesses elasticity. Answer/Explanation. TRUE ? Rayon is (a) natural silk (b) artificial silk (c) natural rubber (d) synthetic plastic. Thermoplastic = can be melted and re-formed. There are many types, varying from very slow to very fast curing. Polyester fibres are used for making hand knit sweaters. No. while nylon-6,6 is a polyamide which is commonly known as fibre. A true B. ? Die Schwerpunkte der Forschung liegen auf … Melamine plastic or melamine formaldehyde is a hard, thermoset plastic material made from melamine and formaldehyde by polymerization. A polymer plastic which cures irreversibly is called a thermosetting plastic. 7. On the opposite of that Thermosetting doesn't regain its shape after heating. Thermoplastic softens on heating and then can be moulded into various shapes. Plastics are comprised of a long chain of polymers, where polymers are composed of smaller, uniform molecules. (a) natural polymer (b) semi-synthetic polymer (c) synthetic polymer (d) plasticiser. true or false The lesson covers the complete explanation of class 8 Chapter 3 Synthetic Fibres and Plastics.Topics covered are Introduction to fibres, kinds of fibres. (True or False) c) Most polymers used in 3D printing applications are thermoplastic (True or False) 23. All polymers made from polyethylene will have the same density. b. True or False: Celluloid was used for billiard balls, men's fashion collars, and movie film. b. 7 Which of the following is the chemically inert to organic solvents? When small amounts of noxious material is added to ethanol, it becomes unfit for drinking and is known as natured alcohol. 1) Answer True or False for the following questions. Question 7. 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