True b. Thermosets usually are three-dimensional networked polymers in which there is a high degree of cross-linking between polymer chains. Plastics can be easily moulded into any shape. Hence the given statement is false. Thermoplastics are 100% recyclable. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Thermosetting plastic once set do not soften on heating. FALSE; Plastic is suitable for building large and heavy structures. Some common thermoplastic materials include polyethylene (PE), polycarbonate (PC), and polyvinyl chloride (PVC). Question 2. Answer: Nylon. They can be melted again and again. Whereas, the others mentioned are thermoplastics that can be moulded on heating. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. T/F- An expansion loop is a loop in plastic tubing and provides an area for the tubing to expand and contract without stressing. True. Sample Density B. Can you write the major difference between these two types of plastics? (B) examples of thermoplastics. Question 12. PVC (Poly vinyl chloride) and Polythene are: (A) examples of thermosetting plastics. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. The melting point of PVC is normally 212 0 C. Glass transition temperature is about 81 0 C. Glass transition temperature is the temperature at which the polymer transits from a hard glassy state to a rubbery state upon the increasing of temperature. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. All Plastics, Thermoplastic Or Thermoset, Will Degrade At Some Temperature? Fill in the blanks. 6. false, false, true, true, true. Some other examples of thermosetting polymers include a substance used to make old TV sets and certain types of strong glue. Examples – Polythene and polyvinyl chloride(PVC) Thermosetting PlasticThe plastic which getsmoulded once, cannot besoftened on heating is called thermosetting plastic. For Any Sample Of Plastic, It Is Generally Too Costly To Count The Number Of Repeating Units On Each Of The Polymer Chains. A thermosetting plastic, or thermoset, solidifies or "sets" irreversibly when heated; they cannot be reshaped by heating. In summary, thermo-softening plastics are soft and melt when heated, whereas thermosetting plastics are hard and do not soften or change their shape when heated. a. Justify each choice. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Separate polymers are joined in order to form a huge polymer. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. A lot of plastic pollutes our environment. Question. Plastic Identification with the Burn Test. 3. 1M 4. a. When you heat thermoplastics, the molecules do not chemically bond with each other. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Polymers are This quiz is incomplete! All fibres are made up of very large units which in turn are made up of many small units. True False QUESTION 3 PVC is a commonly recycled plastic material. Question 40. Why then is there concern today about their increasing use? Refuse (avoid) is the best way to manage plastic. True Or False? Question 1. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Instead, thermoplastic chains are held together by van der waal forces, weak attractions between molecules. B) True 14. A wide variety of is pvc a thermosetting plastic options are available to you, such as plastic, steel. A) False 13. What is High Density Polyethylene (HDPE)? Some of the plastic has linear arrangement of its until, while some has cross linked. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. ? False. Plastic Applications. True or False : Question 1. 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. 21. 3) Epoxy resin is a thermoplastic? Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. 22. Once formed, it can be heated and reformed over and over again Like synthetic fibres, plastic is also a ........... Toys, carry bags, plastic bowls, electric wire. b. a. Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers. Bloomberg planning to double plastic, all recycling in New York City. 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. TRUE ? 7. It is used to make many items like socks, ropes, tents, toothbrushes, car seat belts, sleeping bags, curtains etc. Bitumen-treated fiberglass felt. 4 Which is a thermosetting plastic? a. ... EPDM is a thermosetting plastic. TRUE ? State whether the statements given below are True or False: All fibres are made up of very large units which in turn are made up of many small units. A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. Which of the following is a thermosetting plastic: (a) PVC (b) nylon (c) teflon (d) bakelite. Nylon fibres are strong elastic and light, lusturus and easy to wash. 22. A. PVC. Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. Examples of thermoplastic types are PVC (Polyvinyl Chloride) and PE (Polyethylene). Curing is induced by heat or suitable radiation and may be promoted by high pressure, or mixing with a catalyst. TRUE ? Such a material is also known as a thermoset or thermosetting polymer. Fill in the blanks. (B) Melamine. PVC is polyvinyl chloride and it is a type of vinyl polymer. Examples of thermosetting plastics include phenolic resins, amino resins, polyester resins, silicon resins, epoxy resins, and polyurethanes. its fibres can also be woven like those of natural fibres. A) PVC B) Polythene C) Bakelite D) None of these 19. 5. Examples – B akelite and melamine. less flexible but more fire resistant. 1 true 2 true 3 false ‐The plastic is solid. 7. a. Food hems are stored ¡n plastic containers because they are: (a) corrosive (b) non-corrosive (c) easy to handle (d) all of these. Urea, Ammonia nitrate and ammonium sulphate are examples of: 7 true Play this game to review Chemistry. Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. A) true B) false 17. What are polymers? To play this quiz, please finish editing it. This makes thermosetting plastics ideal for producing heat resistant products such as insulation parts, car parts, etc. (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. T/F- An expansion loop is a loop in plastic tubing and provides an area for the tubing … FALSE; PVC is a thermoplastic. Thermosetting polymers solidify into a permanent design and shape. ? FALSE; Epoxy resin is a thermoplastic? Alibaba.com offers 571 is pvc a thermosetting plastic products. False. Give the name of a plastic used for making fibres. Give one example of each. TRUE ? It is a man-made fibre obtained from a natural source wood pulp. They are classified either as thermosetting polymers or thermoplastic polymers. (D) examples of heavy fibers. b. 4) PVC is a thermoplastic. Nylon was also known as artificial silk in China. False. Answer: Nylon. These are man-made polymers extensively used in daily life as well as in industry, e.g. Answer. ... EPDM and PVC, PVC is generally. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. … Thermoplastics are 100% recyclable. Thermosetting plastics, also called . Polyester is the strongest synthetic fibre. 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. Study 35 ET 241 Final Review flashcards from Ben B. on StudyBlue. 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