(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. Answer (d) bakelite Bakelite is a thermosetting plastic. Examples of thermoplastic types are PVC (Polyvinyl Chloride) and PE (Polyethylene). If subjected to extremely high temperatures, the material may unwantedly soften, deform, and … MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. 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. Assertion: Bakelite is a thermosetting plastic. 4 Which is a thermosetting plastic? If re-heated they cannot soften as polymer chains are interlinked. A) PVC B) Polythene C) Bakelite D) None of these 19. Features & Benefits. b. Thermosetting polymers solidify into a permanent design and shape. Thermoplastics are 100% recyclable. 5. Answer: (D) Bakelite. What is High Density Polyethylene (HDPE)? Thermosetting Plastics:There are some plastics which when … Nylon was also known as artificial silk in China. b. Alibaba.com offers 571 is pvc a thermosetting plastic products. False. Thermosetting plastic molecules, on the other hand, form permanent chemical bonds or cross links with each other once heated. FALSE; HDPE is a tough plastic used for making toys. Polyester fibres are used for making hand knit sweaters. It was prepared from coal water and air. Question 3. ? 7 true Nylon is a thermoplastic polymer. 3) Epoxy resin is a thermoplastic? A) true B) false 20. True False QUESTION 4 This process pushes material through a die to form a long contiuous shape. Answer: (False) Correct statement: It is good to wear clothes made of fibres while cooking. Can you write the major difference between these two types of plastics? This problem has been solved! ... EPDM and PVC, PVC is generally. State True or False: Thermoplastic can be softened on heating and moulded repeatedly. FALSE; PVC is a thermoplastic. True. Answer 1 Cut the PVC coating in a manner that the die will remove the coating in small pieces. The raw material to make plastic is oil. There are multiple thermoplastic resins that offer various performance benefits, but most materials commonly offer high strength, shrink-resistance and easy bendability. True b. They are classified either as thermosetting polymers or thermoplastic polymers. PE and PVC may also be cross-linked making them thermosetting types. True. Which of the following does not have cross linked arrangement: (A) Bakelite. Acrylic – Acrylic is commonly used for consumer goods. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Acrylic is an artificial wool. Thermosetting plastics Thermosetting plastics can only be heated and shaped once. Polythene, polystyrene, PVC, melamine and formica are plastics. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc. This makes thermosetting plastics ideal for producing heat resistant products such as insulation parts, car parts, etc. Although thermosetting plastics cannot be melted into new products, they can still be reused for other applications. False. Polyester is the strongest synthetic fibre. Rayon is a natural fibre. ? Answer 2 Grind the PVC coating to 5 mil before treading. Answer: Polymers are compounds that are made up of … Answer: Bakelite. 5) HDPE is a tough plastic used for making toys. Instead, For Processing Reasons, Which Value Is Given To Designate Polymer Chain Length? Answer. Which one of the following is an example of a biode-gradable polyester (a) PHBV (b) PET (c) Nylon (d) Bakelite Answer: (a) PHBV. They can be melted again and again. The cross-linking restricts the motion of the chains and leads to a rigid material. False EPDM is a thermosetting plastic. Examples: Nylon, PVC, polystyrene, etc. Synthetic fibres are synthesised from raw material called …….... . On the opposite of that Thermosetting doesn't regain its shape after heating. Like synthetic fibres, plastic is also a ........... Toys, carry bags, plastic bowls, electric wire. ... State whether the following statements are True or False: Question 1. However, like any other material, thermoplastics have their limitations. False. Question 4. It is not advised to store food items in plastic containers as it may react with the walls of container. Food hems are stored ¡n plastic containers because they are: (a) corrosive (b) non-corrosive (c) easy to handle (d) all of these. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. a. Epoxy resin. It is a man-made fibre obtained from a natural source wood pulp. False, EPDM is a thermosetting plastic. TRUE ? (D) examples of heavy fibers. True False QUESTION 3 PVC is a commonly recycled plastic material. Question 2. IV. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. 3) Examples are polythene and polyvinyl chloride. 4) PVC is a thermoplastic. T/F- PVC fittings are made by the extrusion process in which plastic resins are heated, softened, and forced through a circular die, which forms the cylindrical pipe shape. Separate polymers are joined in order to form a huge polymer. Can you write the major difference between these two types of plastics? It remains crisp, wrinkle free and easy to wash, so it is quite suitable for making dressing material. Many small units combine to form a large single unit called a ……... . Question 12. (D) None of these. Some of the plastic has linear arrangement of its until, while some has cross linked. Which of the following is a thermosetting plastic: (a) PVC (b) nylon (c) teflon (d) bakelite. plastic (polythene) 49. A) true B) false 18. ... EPDM is a thermosetting plastic. Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. 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. Perlite board (as cover board), sandwiched between the insulation and the roof membrane, is generally used with. Question. B. Polythene. 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. PVC can be made either as a flexible plastic or a rigid plastic by means of additives. Urea, Ammonia nitrate and ammonium sulphate are examples of: True. Thermoplastics are 100% recyclable. When you heat thermoplastics, the molecules do not chemically bond with each other. False. a. Answer: False. a. True. Polyvinyl chloride (PVC) is considered a thermoplastic. Question 21. It can be dyed in a wide variety of colors. Answer: True. What is Acrylonitrile Butadiene Styrene (ABS)? (a) melamine (b) teflon (c) polythene (d) PVC. a. Give one example of each. Vinyl plastic and PVC are often the same thing. Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers. False » Questions » Engineering » Civil Engineering » Civil Engineering - Others » EPDM is a thermosetting plastic. Play this game to review Chemistry. Some other examples of thermosetting polymers include a substance used to make old TV sets and certain types of strong glue. A lot of plastic pollutes our environment. B. Thermoplastics and thermosetting plastics . 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. Such a material is also known as a thermoset or thermosetting polymer. Even with prolonged heating (it may char), thermosetting plastics retain their strength and shape. Some common thermoplastics are polyethylene, PVC, polystyrene, nylon, and acetate.. Thermosetting plastics: Thermosetting Plastics are cross-linked polymers, which become soft only on first heating with pressure and get hard permanently on cooling due to chemical changes by condensation and polymerization, and becomes unaffected by the heat or solvents. For Any Sample Of Plastic, It Is Generally Too Costly To Count The Number Of Repeating Units On Each Of The Polymer Chains. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. The main physical difference is how they respond to high temperatures. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Are the statements true or false when threading a piece of PVC-coated conduit? False. TRUE ? PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Containers; Toys Whereas, the others mentioned are thermoplastics that can be moulded on heating. False. 6. ? They may also be mixed from cold ingredients. True or False : Question 1. True. its fibres can also be woven like those of natural fibres. See the answer. Basil Hamed. 1 true 2 true 3 false ‐The plastic is solid. The main thermosetting plastics are epoxy resin, melamine formaldehyde, polyester resin and urea formaldehyde. Examples of thermoplastics include polythene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), nylons, etc… Polyvinyl chloride (PVC) : pipes, cable insulation, packaging, flooring, toys; Polyethylene : bottles, cans, packaging materials; Thermosetting polymers (Thermosets) TS cannot tolerate repeated heating cycles as thermoplastics can. Can you write the major difference between these two types of plastics? (a) Melamine (b) Polythene – (c) PVC (d) Nylon Answer. A wide variety of is pvc a thermosetting plastic options are available to you, such as plastic, steel. Nylon fibres are strong elastic and light, lusturus and easy to wash. T/F- An expansion loop is a loop in plastic tubing and provides an area for the tubing … Which of two is thermosetting plastic—PVC or bakelite? Science with Answers to help students understand the concept very well break forced...: it is a thermosetting plastic is solid once heated the motion the... 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