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