True. The repeat unit in natural rubber is isoprene. A true B. False. B false. Long Answer Type Questions Question. Melamine plastic or melamine formaldehyde is a hard, thermoset plastic material made from melamine and formaldehyde by polymerization. (b) Thermosets cannot be reshaped. Play this game to review Chemical Bonds. Note that the monomeric units that make up the polymer are not identical with the starting components. True or False? FALSE; HDPE is a tough plastic used for making toys. (e) Assertion is false but Reason is correct. ... Rubber is a linear polymer. 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. a. PVC. They are classified either as thermosetting polymers or thermoplastic polymers. 7 Which of the following is the chemically inert to organic solvents? ? 1) Answer True or False for the following questions. FALSE; Epoxy resin is a thermoplastic? 1. The assertion is true but the reason is false. Which one of the following is not a condensation polymer? 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. Indicate whether each statement is true or false:(a) Elastomers are rubbery solids. (True or False) c) Most polymers used in 3D printing applications are thermoplastic (True or False) Melamine (MF) ? ? 6 Which of the following is the thermoplastic material? When small amounts of noxious material is added to ethanol, it becomes unfit for drinking and is known as natured alcohol. A full revision with question-answer and explanation in the form of MCQs based on latest CBSE Syllabus for new academic session 2020-2021. ? Rayon is (a) natural silk (b) artificial silk (c) natural rubber (d) synthetic plastic. 4) PVC is a thermoplastic. a. TRUE ? True. true or false Commercially ... Melamine is a versatile material which resists the spread of fire. Question 6. Answer: c Explaination: (c) It … 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 […] (a) Rayon (b) Polymer (c) Terylene (d) Plastic (e) Polyester (f) Teflon. FALSE; Plastic is suitable for building large and heavy structures. True. The fabric tery wool is obtained by mixing terylene and wool. 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. while nylon-6,6 is a polyamide which is commonly known as fibre. D. D Bakelite. FALSE. Question 7. Semi Crystalline PE is a family member of a broader group known as _______________; which also includes Polypropylene. Nylon was also known as artificial silk in China. Like polypropylene, polyethylene is a _____ thermoplastic polymer, which means it becomes pliable and moldable above a specific temperature and can be remolded multiple times. Answer. 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 English. 6) Which of the following is commonly used in schools for vacuum forming? [2]:2 It is made of repeating units linked by amide links [3] similar to the peptide bonds in proteins. HIPS ? ... Melamine is (a) thermoplastic polymer (b) thermosetting polymer (c) fibre (d) elastomer. A. The key difference between polymers and plastics is that plastic is a specific type of polymer. (c) Both Assertion and Reason are false. D. Glyptal. 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. Strong heat causes these polymers to discolor and decompose. 23. Plastic is suitable for building large and heavy structures. True. Once formed, it can be heated and reformed over and over again A polymer of prop-2-enenitrile is called 1) Saran 2) Orlon 3) Dacron 4) Teflon 51. Before the thermosetting plastic cures it is malleable and can be moulded into different forms, or used as an adhesive. 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’. Reason (R): Mechanical and aesthetic properties of cellulose can be improved by acetylation. Question 2. a. TRUE ? B. Neoprene. All fibres are made up of very large units which in turn are made up of many small units. b. Polyester. Small molecules that make up larger molecules. False. ... Thermoplastic polymer _____ _____ harden permanently when formed and cannot be softened by head and remolded. 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. Class 8 Science Chapter 3 MCQ (Multiple Choice Questions) of Synthetic Fibres and Plastic. ? Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) a. 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 acrylic B. Assertion (A): Rayon is a semi-synthetic polymer and is taken as a better choice than cotton fabric. True or False: Celluloid was used for billiard balls, men's fashion collars, and movie film. It can cure because of heating, owing to a chemical reaction, or following irradiation like processing by means of electronic beams. Answer/Explanation. Question 46. 50. It is risky to wear synthetic clothes while working in the kitchen. True. Unter der Leitung von Prof. Dr.-Ing. 25 State whether the following statements are True/False. (c) Thermoplastic polymers can … b. A good example of a thermosetting polymer is vulcanized rubber. Thermoplastic = can be melted and re-formed. The lesson covers the complete explanation of class 8 Chapter 3 Synthetic Fibres and Plastics.Topics covered are Introduction to fibres, kinds of fibres. B epoxy C. C melamine. Answer. Neoprene rubber are thermoplastic polymers. Such as polythene, polyvinyl chloride etc. B false. 5) HDPE is a tough plastic used for making toys. FALSE; Which of the following is commonly used in schools for vacuum forming? Synthetic fibre do not melt on heating. [CBSE AIPMT 2012] A. (ii) Cross-linked polymers: These are formed from bi- functional and tri- functional monomers. TRUE ? (i) Linear polymer: These polymers consist of long and straight chains. Terylene ( d ) plasticiser status listed. PE, is a versatile material which resists spread., a condensation polymer of prop-2-enenitrile is called polymer whether the following the. 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