a. a. 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. Play this game to review Chemical Bonds. 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. Advances in thermoset and thermoplastic technology are ongoing and there's definitely a place for both. A full revision with question-answer and explanation in the form of MCQs based on latest CBSE Syllabus for new academic session 2020-2021. Commercially ... Melamine is a versatile material which resists the spread of fire. False. b. FALSE; Which of the following is commonly used in schools for vacuum forming? True. TRUE ? ... like molecule consisting of a large number of simple small molecules joined to each other by chemical bonds is called polymer. (c) Thermoplastic polymers can … FALSE. B false. 5) HDPE is a tough plastic used for making toys. Semi Crystalline PE is a family member of a broader group known as _______________; which also includes Polypropylene. Question 7. 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. (i) Linear polymer: These polymers consist of long and straight chains. (d) Assertion is correct but Reason is false. FALSE; PVC is a thermoplastic. Small molecules that make up larger molecules. Note that the monomeric units that make up the polymer are not identical with the starting components. Which of the following statements is false? True. 2. 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 softens on heating and then can be moulded into various shapes. Like polypropylene, polyethylene is a _____ thermoplastic polymer, which means it becomes pliable and moldable above a specific temperature and can be remolded multiple times. They are classified either as thermosetting polymers or thermoplastic polymers. ? Novolac, a condensation polymer of phenol and formaldehyde is a thermosetting polymer. B epoxy C. C melamine. High-density polyethylene or HDPE is a thermoplastic polymer used in the production of plastic bottles, containers, corrosion-resistant pipes, etc. A polymer plastic which cures irreversibly is called a thermosetting plastic. There are many types, varying from very slow to very fast curing. A true B. 17. 1) Answer True or False for the following questions. 14. All polymers made from polyethylene will have the same density. B. Neoprene. B false. Polyethylene, or PE, is a polymer composed of chains of ethylene units.... See full answer below. 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. 1. FALSE; Plastic is suitable for building large and heavy structures. 17.Which kinds of materials are used in civil structures? (ii) Cross-linked polymers: These are formed from bi- functional and tri- functional monomers. State whether the statements given below are 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. Thermoplastic = can be melted and re-formed. Answer. Examples: Nylon, PVC, polystyrene, etc. 23. True. Question 2. False. C. Melamine. 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. Synthetic fibre do not melt on heating. Long Answer Type Questions Question. True or False? 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. 25 State whether the following statements are True/False. TRUE ? D. D Bakelite. False. 50. As with most rubbers, neoprene is an elastomer. [CBSE AIPMT 2012] A. Dacron. Synthetic Fibres and Plastics Class 8 Science Chapter 3 as per NCERT Book used in CBSE and other Schools. Such as polythene, polyvinyl chloride etc. Nylon was also known as artificial silk in China. ... Thermoplastic polymer _____ _____ harden permanently when formed and cannot be softened by head and remolded. The presence of crosslinks hardens the overall structure. 6) Which of the following is commonly used in schools for vacuum forming? Unter der Leitung von Prof. Dr.-Ing. Answer. ? Nylon is a thermoplastic silky material [1] that can be melt-processed into fibers, films, or shapes. 6 Which of the following is the thermoplastic material? True. No. On the opposite of that Thermosetting doesn't regain its shape after heating. Reason (R): Mechanical and aesthetic properties of cellulose can be improved by acetylation. Indicate whether each statement is true or false:(a) Elastomers are rubbery solids. (e) Assertion is false but Reason is correct. 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. 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. ? FALSE; Epoxy resin is a thermoplastic? HIPS ? b. (a) Rayon (b) Polymer (c) Terylene (d) Plastic (e) Polyester (f) Teflon. true or false (True or False) c) Most polymers used in 3D printing applications are thermoplastic (True or False) The repeat unit in natural rubber is isoprene. Answer: True. TRUE ? Melamine (MF) ? Strong heat causes these polymers to discolor and decompose. A good example of a thermosetting polymer is vulcanized rubber. True or False: Celluloid was used for billiard balls, men's fashion collars, and movie film. A true B. Elastomer = possesses elasticity. Rayon is (a) natural silk (b) artificial silk (c) natural rubber (d) synthetic plastic. (ii) Branched chain polymers: These polymers contain linear chains having some branches. It is a runny liquid that can be processed to make latex gloves, erasers, and party balloons. All fibres are made up of very large units which in turn are made up of many small units. (a) natural polymer (b) semi-synthetic polymer (c) synthetic polymer (d) plasticiser. D. Glyptal. It can cure because of heating, owing to a chemical reaction, or following irradiation like processing by means of electronic beams. Question 6. When small amounts of noxious material is added to ethanol, it becomes unfit for drinking and is known as natured alcohol. TRUE ? ... Melamine is (a) thermoplastic polymer (b) thermosetting polymer (c) fibre (d) elastomer. Question 46. Rubber tapped from para rubber trees is a polymer of isoprene monomers. 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. ... Rubber is a linear polymer. It is risky to wear synthetic clothes while working in the kitchen. The fabric tery wool is obtained by mixing terylene and wool. Different types of synthetic fibres like, Rayon fibres, Nylon fibres, Polyester fibres and Acrylic fibres have been explained. a. 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’. Which one of the following is not a condensation polymer? (b) Thermosets cannot be reshaped. The key difference between polymers and plastics is that plastic is a specific type of polymer. A acrylic B. Such as low density polythene. Assertion (A): Rayon is a semi-synthetic polymer and is taken as a better choice than cotton fabric. ? [CBSE AIPMT 2012] A. 7. Polyester fibres are used for making hand knit sweaters. [2]:2 It is made of repeating units linked by amide links [3] similar to the peptide bonds in proteins. ... State whether the following statements are True or False: Question 1. 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. 6. 4) PVC is a thermoplastic. Play this game to review English. Neoprene rubber are thermoplastic polymers. The assertion is true but the reason is false. TRUE ? b. Once formed, it can be heated and reformed over and over again A. a. PVC. b. A. Die Schwerpunkte der Forschung liegen auf … (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. ? B. Answer: c Explaination: (c) It … False. Melamine plastic or melamine formaldehyde is a hard, thermoset plastic material made from melamine and formaldehyde by polymerization. A polymer of prop-2-enenitrile is called 1) Saran 2) Orlon 3) Dacron 4) Teflon 51. True. Nylon is a thermoplastic polymer. Class 8 Science Chapter 3 MCQ (Multiple Choice Questions) of Synthetic Fibres and Plastic. 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. 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