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