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