These polymers are also referred to as Thermosets or Thermosetting Plastics. Melamine is a thermosetting plastic which is resistant to fire and can tolerate heat better than other plastics. C) Polymers. Some common examples are bakelite, urea-formaldelyde resins, etc. Neoprene is a polymer of chloroprene (CH 2 =C(Cl)-C=CH 2) so it is an addition polymer, not a condensation polymer. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. false. Which one of the following is an example of thermosetting polymer . Novolac, a condensation polymer of phenol and formaldehyde is a thermosetting polymer. A. Dacron B. Neoprene C. Melamine D. Glyptal 2. C) Cellulose . Answer. Login. True. Which of the following is not a limitation of magnesium and magnesium alloys? Which of the following is an example of a thermosetting polymer? (ii) Linear slightly branched long chain molecules. - Step growth, Copolymer. D) Proteins _____ 5. Ask Questions, Get Answers Menu X. home ask tuition questions practice papers mobile tutors pricing. With a number of benefits to thermosetting plastics vs. thermoplastics, the methods and materials fill an important role in the plastic fabrication industry.Within the class of thermosetting polymers, there are a number of different types of material that each serve unique purposes and applications. Which of the following is an example of a synthetic polymer? 60 seconds . Check Answer and Sol When magnesium is the material of choice, it is almost always for weight reduction.t/f. Sir/ Mam, It does not. They cannot be softened by heat but are decomposed by it. Low-density polyethylene. Justify each choice. Among the following, the weakest inter-particle forces of attraction are present in 1) Thermosetting polymers 2) Thermoplastic polymers 3) Fibres 4) Elastomers 33. Which of the following monomers form biodegradable polymers? Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. 500+ + 400+ + 400+ + लिखित उत्तर . (A) Polystyrene (B) Nylon (C) PVC (D) Polypropylene. Which compound form linear polymer … 60 seconds . निम्नलिखित में से कौन सा एक थर्मोसेटिंग बहुलक है? Thermosetting polymers are a type of polymer where macromolecular chains bond with each other to form a cross-linked 3D (3 dimensional) network. Condensation polymers are obtained by bifunctional molecules (monomers) with the elimination of smaller molecules whereas additional polymers are obtained from multiple bonds containing monomers. This temperature is called which one of the following: (a) freezing point, (b) glass transition temperature, (c) melting temperature, or (d) recrystallization temperature? Options (a) – CH₂ – C = CH – CH₂ – I Cl (b) – CH₂ – CH – I Cl (c) H H O O I I II II – N – (CH₂)₆ – N – C – (CH₂)₄ – C – (d) Correct Answer: Explanation: No explanation available. A polymer plastic which cures irreversibly is called a thermosetting plastic. It is used to make electrical switches and handles of utensils. Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. Define thermosetting polymer. Plastic is a natural or synthetic resin 3. A polymer which has a structure of interlinked chains. Neoprene rubber are thermoplastic polymers. SURVEY . Explanation: Melamine resin or melamine formaldehyde (also shortened to melamine) is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization. Tags: Question 18 . Report an issue . Plastic is a non-metallic material that can be moulded to any shape 2. true. Urea-formaldehyde resin Polyvinylchloride Polyester Neoprene Answer : A संबंधित वीडियो. X . Question 36. Which of the following is a thermosetting polymer? 1. MCQs Of Polymer chemistry 1. The main physical difference is how they respond to high temperatures. A. polyethylene B. a linear polymer C. a branched polymer D. a cross-linked polymer 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. Which of the following is a thermosetting plastic? Teflon is a thermoplastic material and is much similar in structure to that of polyethylene but due to the strong C-F bond, its melting point goes high to 326°C. Report an issue . Studying NCERT Class 12 Chemistry exemplar for Chapter 15 Polymers will help you learn the concept comprehensively from the exam … These cannot be reused. (A) Bakelite (B) PVC (C) Nylon 6 , 6 (D) Buna- S . A) Starch. 1 answer. As engineering materials, they are relatively new compared to metals and ceramics, dating only from around the mid-1800 s. It is appropriate to divide them into the following three categories; Thermoplastic polymers (thermoplastics/TP) Thermosetting polymers (thermosets/TS) Elastomers (rubbers/E) (i) Dacron (ii) Buna-S (iii) Neoprene (iv) Novolac; Which of the folloiwng are characteristics of thermosetting polymers? Thermoplastics are 1) Linear polymers 2) Soften or melt on heating 3) Molten polymer can be moulded in desired shape 4) All are correct thermosetting polymer synonyms, thermosetting polymer pronunciation, thermosetting polymer translation, English dictionary definition of thermosetting polymer. Buna-S needs buta 1, 3-diene and Neoprene needs 2-chloro 1,3-butadiene. (i) Heavily branched cross linked polymers. Phenol formaldehyde resin/ Bakellite/ Novolac - - Obtained by the condensation reaction of phenol with formaldehyde. Share. answer choices . [NCERT Exemplar] (a) Dacron (b) Buna-S (c) Neoprene (d) Novolac . It can cure because of heating, owing to a chemical reaction, or following irradiation like processing by means of electronic beams. D) A Cross-Linked Polymer _____ 4. polyethylene. Question from Polymers,jeemain,aipmt,chemistry,cbse,unit5,class12,organic-chemistry-polymers,q38,medium. 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. Polymers can be separated into plastics and rubbers. Is it thermoplastic or thermosetting plastic? 2. asked Jun 20 in Chemistry by BhratJha (44.3k points) synthetic fibers and plastics; class-8; 0 votes. Which of the following methods is used to cure thermosetting polymers? Before the thermosetting plastic cures it is malleable and can be moulded into different forms, or used as an adhesive. Which of the following polymers, need atleast one diene monomer for their preparation? Comment. A) Polyethylene. While polyethylene is a thermoplastic polymer … Which of the following is not an example of addition polymer ? epoxy. Magnesium can be significantly strengthened by cold work.t/f. answer choices . Answer: Explaination: (b) and (c). Which of the following is an example of a thermosetting polymer? D) Proteins _____ 3. Which of the following would you expect to be elastomers and which thermosetting polymers at room temperature? 2) Which of the following statements are correct for plastic? Email. Among the following, the weakest interparticle forces of attraction are present in 1) Thermosetting polymers 2) Thermoplastic polymers 3) Fibres 4) Elastomers 33. Which of the following is a thermosetting polymer? poor machinability . These polymers are cross linked or heavily branched molecules, which on heating undergo extensive cross linking in moulds and again become infusible. These types of plastics can generally only be heated once to set them into the shape that is needed, and they are not generally recycled. (iii) Become infusible on moulding so cannot be reused. Properties of Thermosetting Polymers. Explanation: No explanation is available for this question! Which of the following is a thermosetting polymer? 1:50 2.7k + Thermosetting Polymers - They are highly cross - linked, hard, infusible and insoluble polymers.They cannot be reused. Thermosetting polymer,bakelite is formed by the reaction of phenol with (a) CH 3 CH 2 CHO (b) CH 3 CHO (c) HCHO (d) HCOOH. - wherein. Check Answer and Solution for abov Thermoplastics are 1) Linear polymers 2) Soften or melt on heating 3) Molten polymer can be moulded in desired shape सभी को देखें. 31. False. Questions >> JEEMAIN and NEET >> Chemistry >> Polymers. It is used to make floor tiles, kitchenware and fire resistant fabrics. * a) PVC b) melamine c) polyethylene d) polystyrene 2 See answers dumeghanas dumeghanas Answer: melamine . Tags: Question 17 . High-density polyethylene. Thermosetting materials c. Both a. and b. d. None of the above. (a) Cellulose (b) Polythene (c) Polyvinyl chloride (d) Nylon-6. The word thermosetting literally translates to something which sets permanently upon heating. Chat with tutors . Answer/Explanation. Dacron and Novolac are condensation polymers. polystyrene. Grocery bags. Once set into a new solid cannot be remelted. AMU 2018: Which of the following is an example of thermosetting polymers? 3) Thermoplastic 4) Thermosetting polymers 32. while nylon-6,6 is a polyamide which is commonly known as fibre. Next similar question. SURVEY . Bakelite is an example of thermosetting polymer. Which of the following plastics do not have cross-links between their polymer chains asked Jun 20 in Chemistry by BhratJha (44.3k points) synthetic fibers and plastics; class-8; 0 votes. Question 35. - Novolac is linear Which of the following is a biodegradable polymer? 3) Thermoplastic 4) Thermosetting polymers 32. Answer Explanation ANSWER: Thermosetting materials. C) A Branched Polymer. The material … I. Q. 1 answer. B) A Liner Polymer. Tire rubber . B) Plastics. Eg:- Bakellite, Urea, Formaldehyde, Resin, etc . What does it mean to be a thermosoftening polymer? One of the main properties of thermoset plastics or polymers is that they harden during the moulding process and after solidifying they cannot be softened. 3-hydroxybutanoic acid+3-hydroxypentanoic acid II. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Which one of the following is not a condensation polymer? 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2020 which of the following is a thermosetting polymer