The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. 1. Free Question Bank for 8th Class Science Synthetic Fibers and Plastics Synthetic Fibres and Plastics Men made polymers are known as synthetic polymers. Students can read the complete NCERT Solutions for Class 8 Science. Question. Basil Hamed Write the importance of synthetic polymers in our life. B. Polythene. Name the basic component of animal fibres. False, most of the plastics are non-biodegradable. Join now. Solution.pdf Next Previous. D. Bakelite. 7. 4. Thermosetting Plastics:There are some plastics which when moulded once cannot be softened by heating. a. Question 26. 24. polystyrene polythene These are called thermosetting plastics e.g., bakelite and melamine. 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. 25. Aug 02 2016 01:36 PM. 10. Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Identify the type of plastic that can best be used to make electrical switches. (iv) Most of the plastics … Thermoplastics —–>Polythene and PVC ‘ Thermosetting plastics —–> Bakelite and melamine. S. We must use jute clothes or paper bags instead of plastic bags. Answered 4. How do you explain the functionality of a monomer? C. Write 'T' for True or 'F' for False for the following sentences :-1. Thermosetting plastics 5. b) P.E.T. Answer: Since the unit (NH-CHR-CO) n is obtained from a single monomer unit, it is a homopolymer. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. (v) A plastic used for making crockery is _____. is a good conductor of plastics. (ii) All polymers are natural materials. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Answer: Protein Question 3. Match items in List A with the items of list B. (a) anory (b) lopmery (c) relyteen (d) laspict (e) yespolter (f) felton; Long Answer Type Questions. Nylon is also called an artificial silk. True b. 22. 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. Get the solutions for all chapters of Class 8 Science on this page for free. b) Plastics are not affected by heat. Whereas Thermosetting plastics cannot be softened by heating. True; False, synthetic fibres melt on heating. Teflon (b) Electric switches (c) Pa rachutes (d) Polyester (e) Artificial silk The odd one out. Expert's Answer. It can't be recycled. 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. 1. Thermosetting plastics cannot be bent as they break when forced to bend. (iii) It is risky to wear synthetic clothes while working in the kitchen. False- The tests check that the plastic does not stretch - an elastomer would stretch significantly. True; False, synthetic fibres melt on heating; True ; False, most of the plastics are non biodegradable. Which of these plastics can be repeatedly heated and moulded into any desired shape? Reason: In thermosetting plastics, the polymeric chains are held together by strong covalent bonds. Polyethylene, light, versatile synthetic resin made from the polymerization of ethylene. Answer: Cotton Question 2. True. True. 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. Question 4. False. Indicate whether the following statements are True or False. There are two main categories of plastic: Thermosoftening (also called thermoplastics) are plastics … Ask your question. True. Question 41. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Log in. (v) Polyethylene terephthalate (PET) is used in making clothes. Polymers are micro sized molecules. Also write the false statements in their correct form. Answer 26. True, a disadvantage as synthetic fibre is that they melt on heating. (iii) Polythene is thermosetting plastic. e) P.V.C. 6. false, false, true, true, true. False EPDM is a thermosetting plastic. b. 11. Statement: Plastics which get deformed easily on heating and can be bent easily are known as thermoplastics. State True or False (i) Nylon is a polymer. NCERT Solutions for Class 8 Science is provided here. a. Thermosoftening plastics and thermosetting plastics. Which are true … Rithanesh Rithanesh 30.04.2020 Science Primary School Pvc is a thermosetting plastic say true or false 2 5M … Fill in the blanks with appropriate words: 1. 1. BakeliteExplanation:Bakelite is a thermosetting polymer 1. Which of the following option is incorrect statement about rayon? EASY (i) The fabric terywool is obtained by mixing terylene and wool. Related Questions. A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. True b. 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. Which of these is a thermosetting plastic? 1. 2) Thermoplastics can be bent easily. False - The plastic is solid. 1. a. (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. Hint: Write uses of synthetic polymers like nylon, acrylic, terylene, PET, plastics, etc. Download the NCERT Solutions for Class 8 Science PDF here. 25. Thermosetting plastics: 1) Thermoplastics can be softened on heating again and again, therefore they can be moulded and reshaped. Bakelite is used for making electrical switches, handles of various utensils etc. a. polystyrene b. Bakellite c. polythene d. polyvinyl chloride 5. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Answer: (D) Bakelite. Name some artificial fibres. Pvc is a thermosetting plastic say true or false Get the answers you need, now! 1. Thermosetting plastics contain polymers that cross-link together during the curing process to form an irreversible chemical bond. Start studying Chapter 8. Bakelite and melamine are common examples of thermosetting plastics Some common thermoplastics and their uses Polythene (or Polyethylene) Polyethylene is a member of the important family of polyolefin resins. Which of these is a thermosetting plastic? Can you write the major difference between these two types of plastics? Soln: On heating Thermo plastics get deformed and they can be easily bent . False, EPDM is a thermosetting plastic. Plastic is a very generalized term for polymers that can mean either a thermosetting or a thermoplastic Plastic. The main physical difference is how they respond to high temperatures. Write full forms of: a) P.V.C. Log in. Play this game to review Science. Long Answer Type Questions. shuklavaishnavi shuklavaishnavi 28.09.2020 Science Secondary School +5 pts. (v) A plastic used for making crockery is _____. a. bakelite b. polythene c. formica d. melamine 7. Question 40. Plastics are non bio-degradable. Hence these plastics cannot be reprocessed and they can maintain their shape and size even at very high temperatures. 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. Thermosetting plastics cannot be softened on heating, therefore they cannot be moulded and reshaped. Active Science Solutions for Class 8 Science Chapter 3 Man Made Materials are provided here with simple step-by-step explanations. This page provides the questions and answers for all Chapters of Class 8 Science in a simple and clear manner. 4. Join now. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. (ii) Synthetic fibres do not melt on heating. 34. 23. Answer: Nylon, terylene, PET, acrylic, teflon, etc. Which of these plastics is a polymer? Assertion: Bakelite is a thermosetting plastic. Match items in List A with the items of list B. Unscramble the jumbled words given below, related to synthetic materials. False- Material is melted down and reused, something not possible with thermosetting plastics. Ask your question. 12. Thermosetting plastics; Question 3. Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. 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. c) Acrilon is pure wool obtained from sheep. … Question 27. Unscramble the jumbled words given below, related to synthetic materials. Urea, Ammonia nitrate and ammonium sulphate are examples of: […] Indicate whether the following statements are True or False. Polycot, Polywool, Terrycot ,Acrylic State whether the given statements are true or false. Question 5. d) Bakelite is a thermoplastics plastics. Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers. 22 Fill in the blanks. Ask your question. False ... EPDM is a thermosetting plastic. 3. a. Bakelite b. polystyrene c. polythene d. all of these 6. C. PET. Which of the following is not a thermosetting polymer? Join now. 2. Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 15 Polymers. 4. Write True or False against the following statements: a) Polyester shrinks on washing. Indicate whether the following statements are True or False. Is (NH-CHR-CO) n, a homopolymer or copolymer? 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. (a) anory (b) lopmery (c) relyteen (d) laspict (e) yespolter (f) felton. (iv) Starch, cellulose, proteins, silk and rubber are natural polymers. 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 plastic and is used for making electrical switches, handles of various utensils, etc. Wood, paper, woolen clothes, aluminum can 3. Answer: Functionality of a monomer is the number of bonding sites in a monomer. A. PVC. Fill in the blanks. True . Join now. PVC, melamine, polythene, natural ru bber 2. True. Silk, jute, Nylon, wool 4. Log in. State whether the given statement is true or false. 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. 1) Alkyl resin 2) Bakelite 3) Melmac 4) SBR 36. Name a natural fibre. Log in. 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