10. 7. True, a disadvantage as synthetic fibre is that they melt on heating. Indicate whether the following statements are True or False. Polycot, Polywool, Terrycot ,Acrylic State whether the given statements are true or false. Question. 24. Name some artificial fibres. How do you explain the functionality of a monomer? (iv) Starch, cellulose, proteins, silk and rubber are natural polymers. Thermosetting plastics; Question 3. Get the solutions for all chapters of Class 8 Science on this page for free. 3. Play this game to review Science. Download the NCERT Solutions for Class 8 Science PDF here. 4. Basil Hamed Ask your question. 12. b) P.E.T. Answered 4. a. bakelite b. polythene c. formica d. melamine 7. True; False, synthetic fibres melt on heating; True ; False, most of the plastics are non biodegradable. Thermosetting Plastics:There are some plastics which when moulded once cannot be softened by heating. Students can read the complete NCERT Solutions for Class 8 Science. Polymers are micro sized molecules. The main physical difference is how they respond to high temperatures. … Question 4. a. polystyrene b. Bakellite c. polythene d. polyvinyl chloride 5. 1. 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. 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. Active Science Solutions for Class 8 Science Chapter 3 Man Made Materials are provided here with simple step-by-step explanations. (a) anory (b) lopmery (c) relyteen (d) laspict (e) yespolter (f) felton; Long Answer Type Questions. Log in. Answer: Protein Question 3. (a) anory (b) lopmery (c) relyteen (d) laspict (e) yespolter (f) felton. False- The tests check that the plastic does not stretch - an elastomer would stretch significantly. 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. 5M … Answer: Functionality of a monomer is the number of bonding sites in a monomer. Log in. Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Which of the following is not a thermosetting polymer? Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 15 Polymers. Start studying Chapter 8. c) Acrilon is pure wool obtained from sheep. Polyethylene, light, versatile synthetic resin made from the polymerization of ethylene. Aug 02 2016 01:36 PM. 2) Thermoplastics can be bent easily. 1. (iii) It is risky to wear synthetic clothes while working in the kitchen. (v) A plastic used for making crockery is _____. Match items in List A with the items of list B. C. Write 'T' for True or 'F' for False for the following sentences :-1. Also write the false statements in their correct form. 1) Alkyl resin 2) Bakelite 3) Melmac 4) SBR 36. Answer: Nylon, terylene, PET, acrylic, teflon, etc. This page provides the questions and answers for all Chapters of Class 8 Science in a simple and clear manner. Write full forms of: a) P.V.C. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. a. Bakelite b. polystyrene c. polythene d. all of these 6. 4. Which of these plastics is a polymer? Ask your question. Join now. False. Name a natural fibre. Indicate whether the following statements are True or False. Thermosetting plastics cannot be softened on heating, therefore they cannot be moulded and reshaped. 1. Log in. True . […] Answer: Since the unit (NH-CHR-CO) n is obtained from a single monomer unit, it is a homopolymer. False- Material is melted down and reused, something not possible with thermosetting plastics. Answer: Cotton Question 2. Bakelite and melamine are common examples of thermosetting plastics Some common thermoplastics and their uses Polythene (or Polyethylene) is a good conductor of 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. polystyrene polythene Write True or False against the following statements: a) Polyester shrinks on washing. (i) The fabric terywool is obtained by mixing terylene and wool. Question 40. 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. 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. State True or False (i) Nylon is a polymer. C. PET. Name the basic component of animal fibres. Whereas Thermosetting plastics cannot be softened by heating. (ii) Synthetic fibres do not melt on heating. (iv) Most of the plastics … Answer 26. BakeliteExplanation:Bakelite is a thermosetting polymer 1. Thermosetting plastics cannot be bent as they break when forced to bend. Can you write the major difference between these two types of plastics? a. Expert's Answer. The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Fill in the blanks with appropriate words: 1. 34. Is (NH-CHR-CO) n, a homopolymer or copolymer? 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