polythene is a thermosetting plastic true or false

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

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