Which of the following is not a thermosetting polymer? Thermosetting Plastics A plastic substance which does not soften much on heating once it is set i.e can be moulded once is called a thermosetting plastic.Thus softening and moulding are irreversible. (iii) It is risky to wear synthetic clothes while working in the kitchen. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Thermoplastics —–>Polythene and PVC ‘ Thermosetting plastics —–> Bakelite and melamine. True; False, synthetic fibres melt on heating; True ; False, most of the plastics are non biodegradable. It is the most widely used plastic in the world, being made into products ranging from clear food wrap and shopping bags to detergent bottles and fuel tanks. Related Questions. Question 40. Solution.pdf Next Previous. 25. (v) A plastic used for making crockery is _____. C. Write 'T' for True or 'F' for False for the following sentences :-1. Bakelite and melamine are common examples of thermosetting plastics Some common thermoplastics and their uses Polythene (or Polyethylene) (i) The fabric terywool is obtained by mixing terylene and wool. 1) Alkyl resin 2) Bakelite 3) Melmac 4) SBR 36. D. Bakelite. Unscramble the jumbled words given below, related to synthetic materials. b) P.E.T. 2. 1. 1. Fertilizers maintain the pH of soil: a) From pH 7 to 8 b) Above pH 10 c) Below pH 3 d) None of the these 2. False EPDM is a thermosetting plastic. a. polystyrene b. Bakellite c. polythene d. polyvinyl chloride 5. (ii) All polymers are natural materials. The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. Polyethylene, light, versatile synthetic resin made from the polymerization of ethylene. It can't be recycled. 6. false, false, true, true, true. The cross-linking process eliminates the risk of the product remelting when heat is applied, making thermosetting ideal for high-heat applications such as electronics and appliances. True. Polycot, Polywool, Terrycot ,Acrylic State whether the given statements are true or false. The main physical difference is how they respond to high temperatures. Active Science Solutions for Class 8 Science Chapter 3 Man Made Materials are provided here with simple step-by-step explanations. True . 1. Curing is induced by heat or suitable radiation and may be promoted by high pressure, or mixing with a catalyst.Heat is not necessarily to be applied externally. Students can read the complete NCERT Solutions for Class 8 Science. 10. Plastics are non bio-degradable. 23. a. 1. Question. Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers. Which of these plastics is a polymer? Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Log in. Which of these is a thermosetting plastic? Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Reason: In thermosetting plastics, the polymeric chains are held together by strong covalent bonds. Thermosetting plastics cannot be softened on heating, therefore they cannot be moulded and reshaped. Thermosoftening plastics and thermosetting plastics. Download the NCERT Solutions for Class 8 Science PDF here. Play this game to review Science. Polymers are micro sized molecules. Answer: Since the unit (NH-CHR-CO) n is obtained from a single monomer unit, it is a homopolymer. a. Answer: Functionality of a monomer is the number of bonding sites in a monomer. Get the solutions for all chapters of Class 8 Science on this page for free. Name a natural fibre. e) P.V.C. 25. False, most of the plastics are non-biodegradable. Polyethylene is a member of the important family of polyolefin resins. Join now. A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. d) Bakelite is a thermoplastics plastics. Fill in the blanks with appropriate words: 1. Which of these is a thermosetting plastic? Question 4. Fill in the blanks. How do you explain the functionality of a monomer? There are two main categories of plastic: Thermosoftening (also called thermoplastics) are plastics … 34. Long Answer Type Questions. Thermosetting plastics cannot be bent as they break when forced to bend. Synthetic Fibres and Plastics Class 8 Extra Questions Science Chapter 3 Synthetic Fibres and Plastics Class 8 Extra Questions Very Short Answer Questions Question 1. Thermosetting polymers are 1) Cross-lined polymers 2) Do not melt or soften on heating 3) Cross-linking occurs during heating when it hardens irreversibly 4) All are correct 35. Men made polymers are known as synthetic polymers. False. Answer: Nylon, terylene, PET, acrylic, teflon, etc. Thermosetting plastics: 1) Thermoplastics can be softened on heating again and again, therefore they can be moulded and reshaped. False- Material is melted down and reused, something not possible with thermosetting plastics. True b. (b) Assertion is true, Reason is true; Reason is not a correct explanation for Assertion (c) Assertion is true, Reason is false (d) Assertion is false, Reason is true. Answer: Protein Question 3. b) Plastics are not affected by heat. False, EPDM is a thermosetting plastic. State True or False (i) Nylon is a polymer. Can you write the major difference between these two types of plastics? 4. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. These are called thermosetting plastics e.g., bakelite and melamine. Which of these plastics can be repeatedly heated and moulded into any desired shape? BakeliteExplanation:Bakelite is a thermosetting polymer 1. True. b. (iii) Polythene is thermosetting plastic. 24. Statement: Plastics which get deformed easily on heating and can be bent easily are known as thermoplastics. 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. 12. Question 41. Wood, paper, woolen clothes, aluminum can 3. False - The plastic is solid. Whereas Thermosetting plastics cannot be softened by heating. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Log in. PVC, melamine, polythene, natural ru bber 2. a. Bakelite b. polystyrene c. polythene d. all of these 6. Indicate whether the following statements are True or False. False- The tests check that the plastic does not stretch - an elastomer would stretch significantly. Name the basic component of animal fibres. Match items in List A with the items of list B. Unscramble the jumbled words given below, related to synthetic materials. Ask your question. Ask your question. […] We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. (iv) Starch, cellulose, proteins, silk and rubber are natural polymers. Thermosetting plastics contain polymers that cross-link together during the curing process to form an irreversible chemical bond. This page provides the questions and answers for all Chapters of Class 8 Science in a simple and clear manner. Indicate whether the following statements are True or False. State whether the given statement is true or false. 4. Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 15 Polymers. C. PET. Hint: Write uses of synthetic polymers like nylon, acrylic, terylene, PET, plastics, etc. 22. (a) anory (b) lopmery (c) relyteen (d) laspict (e) yespolter (f) felton; Long Answer Type Questions. Urea, Ammonia nitrate and ammonium sulphate are examples of: True; False, synthetic fibres melt on heating. Nylon is also called an artificial silk. shuklavaishnavi shuklavaishnavi 28.09.2020 Science Secondary School +5 pts. Rithanesh Rithanesh 30.04.2020 Science Primary School Pvc is a thermosetting plastic say true or false 2 1. Plastic is a very generalized term for polymers that can mean either a thermosetting or a thermoplastic Plastic. Identify the type of plastic that can best be used to make electrical switches. True b. Is (NH-CHR-CO) n, a homopolymer or copolymer? These solutions for Man Made Materials are extremely popular among Class 8 students for Science Man Made Materials Solutions come handy for quickly completing your homework and preparing for exams. (ii) Synthetic fibres do not melt on heating. 5M … Answer 26. Bakelite is used for making electrical switches, handles of various utensils etc. is a good conductor of plastics. (iv) Most of the plastics … 4. Thermosetting plastics 5. thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. (v) A plastic used for making crockery is _____. Soln: On heating Thermo plastics get deformed and they can be easily bent . Log in. (v) Polyethylene terephthalate (PET) is used in making clothes. Join now. Hence these plastics cannot be reprocessed and they can maintain their shape and size even at very high temperatures. True. B. Polythene. True. … 1. Answered 4. Join now. Join now. 7. Silk, jute, Nylon, wool 4. Answer: Cotton Question 2. Which are true … Start studying Chapter 8. A thermosetting polymer, resin, or plastic, often called a thermoset, is a polymer that is irreversibly hardened by curing from a soft solid or viscous liquid prepolymer or resin. 2) Thermoplastics can be bent easily. Assertion: Bakelite is a thermosetting plastic. Thermosetting plastics; Question 3. Match items in List A with the items of list B. Which of the following option is incorrect statement about rayon? Log in. a. Aug 02 2016 01:36 PM. Question 5. Answer: (D) Bakelite. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. Write the importance of synthetic polymers in our life. Ask your question. Write full forms of: a) P.V.C. Indicate whether the following statements are True or False. EASY (a) anory (b) lopmery (c) relyteen (d) laspict (e) yespolter (f) felton. False ... EPDM is a thermosetting plastic. 11. 22 Fill in the blanks. Basil Hamed Name some artificial fibres. Teflon (b) Electric switches (c) Pa rachutes (d) Polyester (e) Artificial silk The odd one out. Also write the false statements in their correct form. 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