bakelite is thermoplastic true or false

(d) none of these. I thought that thermosets were "set solid" by a chemical reaction that was irreversible. (a) nylon Most polymers used in 3D printing applications are thermoplastic. Which of these fibres is made from raw material obtained from plants: Question 16. These are called thermosetting plastics e.g., bakelite and melamine. Nylon is synthetic whereas cotton, jute and silk are natural fibres. (b) polyester and cotton Rayon is made from cellulose obtained from wood pulp. (d) bakelite. The simplest molecule of a polymer is called …………………. True. Short Answer Type. Answer the following questions in short: 1. Question 30. True 18. (a) rayon Synthetic fibres do not absorb …………………, Question 3. Question 1. Melamine is used for making floor tiles, kitchenware etc. Polymer, any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units. (c) easy to handle Bakelite and melamine are thermoplastics. 3. Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. (c) teflon Question 29. Question 17. Preview this quiz on Quizizz. B. known as thermoplastic. ... Bakelite is obtained from phenol by reacting with [AIEEE 2008] A. HCHO. What precautions should you use when working in an area with a large number (c) rayon (b) papers Question 1. D. CH 3 COCH 3. We know that bakelite is a thermosetting plastics, which is used for making electrical switches, handles of various utensils, etc. Polywool is a mixture of: Once formed, it can be heated and reformed over and over again True or False: Celluloid was used for billiard balls, men's fashion collars, and movie film. Current flows from positive terminal of cell to its negative terminal. Give examples which indicate that nylon fibres are very strong. (a) thermoplastic Electric plugs are made up ………………… plastics. ? Polywool is a mixture of ………………… and wool. 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Wood pulp is used for preparation of: Answer: Thermoplastic The plastic which gets deformed easily on heating and can bern easily is. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. The first significant application of plastics began with the development of Bakelite™. ? Question 13. (c) ……………….. (d) …………….. (a) Reduce A synthetic fibre resembling wool is: Which of the following garbage is biodegradable: Who is the longest reigning WWE Champion of all time? (d) ball point pens. (b) polyethylene Which of the following can be recycled: Explain why plastic containers are favoured for storing food. Check the below NCERT MCQ Questions for Class 6 Science Chapter 12 Electricity and Circuits with Answers Pdf free download. (d) nylon. True B. [CBSE AIPMT 2008] A. (d) none of these. An electrical device that will open an electrical circuit, preventing current flow to the circuit if a small leak to ground is detected, is called a _____. Question 12. Polycot is a mixture of polyester and cotton. Which of the following is used to make non-stick cookwares: (a) artificial a. GFCI 17. (d) cooker handles. Question 5. Which of the following is a thermosetting plastic: (a) broken plastics things HIPS ? (d) bakelite Odd one out: choose the letter of the word that is not related from the other choices. (c) rayon (b) polyester Plastic covering on electric wire cannot by recycled as it is made up of theremosetting plastics. Question 19. (a) nylon FALSE; Epoxy resin is a thermoplastic? Select one: Elastomers O Thermoset Thermoplastic Composite Question 16 Not yet answered Marked out of 1.00 P Flag question The following figure represents Face Centered Cubic structure Select one: True O False Bristles of tooth brush are made from nylon because it is soft, flexible and strong. Silk fibre is obtained from cocoons of the silk moth. Question 3. (c) acrylic 4. Hair and muscles are made of proteins. (iii) the process of formation of polymers by synthesis of monomers. (d) nylon In lab I made samples that were mounted in bakelite. Jammu & Kashmir has banned the use of plastic bags. Fabrics made of …………………. (a) glucose Wire made from which fibre is strongest: Refuse (avoid) is the best way to manage plastic. Question 27. (c) polyester (d) rubber, (b) cellulose Nylon fibre is used for making nylon parachutes and ropes for rock climbing. (a) nylon A long chain like molecule consisting of a large number of simple small molecules joined to each other by chemical bonds is called polymer. Plastic is environmental friendly. Wool is obtained from hair of an animal (sheep). (b) cotton We should wear ………………… clothes in the kitchen. (d) melamine If you feel any information regarding CBSE Class 8 Science Synthetic Fibres and Plastics MCQs Multiple Choice Questions with Answers is missing do reach us and we will look into it and add it accordingly. Rayon is: (b)cotton PET is form of: (d) all of these. (a) thermoplastic 22. Cellulose is made up of a large number of glucose units. (a) PVC (a) polythene and cotton Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Question 6. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Bristles of tooth brush are made from: Bakelite is used for making electrical switches, handles of various utensils etc. (d) none of these. True 5. (a) plastics Plastics are corrosive in nature. 11. A. 15. Is Bakelite thermosetting or thermoplastic. The main physical difference is how they respond to high temperatures. Answer: 1. Hope the information shared regarding the NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download is true and genuine as far as our knowledge is concerned. We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Question 11. (d) iron wastes. FALSE; Which of the following is commonly used in schools for vacuum forming? (d) polyester and wool Question 17. Which of the following is obtained from hair of an animal: Bakelite contains cross linked molecules which on heating undergo extensive cross linking in moulds and again become infusible. True; False, synthetic fibres melt on heating; True ; False, most of the plastics are non biodegradable. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Polyester is a synthetic fibrous material. (d) steel. Thermoset vs thermoplastic, and Bakelite. FALSE; HDPE is a tough plastic used for making toys. Which of the following cannot be recycled: Nylon was prepared from ……………………., ………………… and ……………………, Question 11. Question 16. The Mechanical Properties Of Most Semi-crystalline Polymers Are Highly Dependent On Both Temperature And Strain Rate. Cotton fibre burns readily with smell of burning paper. (b) glass Question 28. Question 26. (a) rayon Hint: Write uses of synthetic polymers like nylon, acrylic, terylene, PET, plastics, etc. False 8. TRUE ? As in, if you heat up the plastic after it sets, it burns instead of melts. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. (c) cotton (b) jute In option A, it is given that bakelite is a thermoplastic. Can you write the major difference between these two types of plastics? Fabrics made of polyester do not wrinkle easily. Polycarbonates Melamine is not thermoplastics, it is thermosetting plastic. Polymers make up many of the materials in living organisms, and they constitute the basis of certain minerals and human-made materials, such as paper and plastics. (b) teflon Question 4. Synthetic fibres are: PET is a form of polyester. (a) plastic toys When did organ music become associated with baseball? NCERT Class 12 Chemistry Exemplar for Chapter 15 Polymers provide you polymer questions multiple choice, polymer MCQ for NEET, Fill in the blanks, Match the following, True or False, Worksheets, polymers Class 12 important questions, exercises and assignments. (b) durable MCQ Questions for Class 8 Science with Answers are prepared as per the Latest Exam Pattern. Question 7. Question 15. (d) wool. 21. ………………… is used for making ploythene bags. Answer: True. (c) nylon (d) wood. The plastics which when moulded once, can not be softened by heating are called …………………, Question 10. Which one of the following statements is not true? (c) nylon Learn vocabulary, terms, and more with flashcards, games, and other study tools. ? Question 8. Polywool is a mixture of polyester and wool. Question  14. (c) hining ………………… fibre resembles wool. ... thermoplastic and thermosetting does bakelite belong? (d) all of these, (d) all of these TRUE ? [CBSE AIPMT 2012] A. True or False: Receptacles used on the job site should be protected with a GFCI. Thermoplastic softens on heating and then can be moulded into various shapes. (True Or False) 2. (a) polyester (b) fruit peels 21. State whether the statements given below are True or False. (a) cellulose (a) carry bags (b) teflon Nylon is used for making parachutes and stockings. (d) rayon. (b) nylon What does contingent mean in real estate? (a) aluminium foil An electric cell converts chemical energy into electrical energy. A bulb has two terminals. It cannot be reused. (c) polythene and wool Plastics are non-biodegradable. (b) polyester and cotton (d) nylon (c) polystyrene Question 10. 1. (c) terylene Plastic reacts with air and water. How long will the footprints on the moon last? Melamine (MF) ? Polymer present in plants is: (c) cotton (c) cotton Which of the following is not biodegradable: C. CH 3 CHO. Question 6. (c) nylon Acrylic, polyethylene and polystyrene are thermoplastic. Question 3. Question 18. Plastics which gets deformed easily on heating and can be bent easily are known as …………………, Question 2. Question 20. (b) polyester and cotton Synthetic fibres are moth and insect resistant. (d) polythene. Genes B. Proteins C. Acid D. Nucleic acid 17. Synthetic fibres are strong, durable and shining, Question 3. (a) polythene and cotton Solving the Synthetic Fibres and Plastics Multiple Choice Questions of Class 8 Science Chapter 3 MCQ can be of extreme help as you will be aware of all the concepts. (c) cement It contributes sturdy structure to the plants. The starting monomers of bakelite are phenol and formaldehyde i.e.Bakelite is a thermosetting polymer. Bakelite is an example of polymer. Wood pulp is used for preparation of Rayon. (b) Reuse (c) acrylic Answer: (False) Correct statement: It is good to wear clothes made of fibres while cooking. (a) glucose Natural rubber has the trans-configuration at every double bond. (c) polyester Question 20. (iv) simple chemical molecules made of single unit. (d) polyester and wool. Examples - Bakelite, Urea-formaldelyde resins • Addition Polymerisation or Chain Growth Polymerisation: Addition polymerisation is called chain growth polymerisation because it takes place through stages leading to increase in chain length and each stage produces reactive intermediates for use in next stage of the growth of chain. (a) thermosetting plastic Question 7. (b) fruit peels True 4. We have provided Electricity and Circuits Class 6 Science MCQs Questions with Answers to help students understand the concept very well. ………………… has anti-stick property and used as a coating on the surface of frying pan. (a) rayon (c) cow-dung Synthetic fibres are also called ………………… fibres. Why don't libraries smell like bookstores? ………………… fabrics do not wrinkle easily. ... bakelite Bakelite is a thermosetting plastic. (d) nylon. Can you write the major difference between these two types of plastics? Join now. Question 25. Acrylic fibres bums with a sooty flame and shrinks to form black beads. Question 4. (d) silk. (ii) chemical molecules synthesized by human. (a) corrosive (a) polyester (b) teflon Articles made of thermosetting plastics Articles made of … Explain the difference between thermoplastic and thermosetting plastics. (d) polyester and wool. Aluminium foil is not biodegradable. Question 22. Fill in the blanks. Polyester is made up of the repeating units of a chemical called …………………. Polyester fibres are used for making hand knit sweaters. (d) rotten fruits. TRUE ? Question 24. (b) silk Which of the following is used for making parachutes and stockings: Explain why some fibres are called synthetic. (a) polyester Soln: On heating, Thermoplastics get deformed and they can be easily bent. Polymer present in plants is cellulose. Which of the following once set do not soften on heating: Can you write the major difference between these two types of plastics? (c) rayon b) Bakelite is a kind of thermosetting plastic which is a bad conductor of heat and electricity. FALSE; PVC is a thermoplastic. TRUE ? Cotton is natural polymer whereas rayon, polyester and polythene are synthetic polymers. Differentiate between thermoplastic and thermosetting plastics. Thermosetting plastic once set do not soften on heating. 14. A. Cellulose B. Starch C. Rubber D. DNA 16. ... Thermoplastic polymer ... (Bakelite) _____ are tough, clear polymers used in protective helmets, safety glasses, and dental crowns. Answer 26. (c) polvthene If plastics are burnt, they evolve oxygen gas. Answer: True. Fruit peels are biodegradable. A synthetic fibre resembling wool is acrylic. (b) nylon Question 19. (b) thermosetting plastic (True Or False) This problem has been solved! Question 23. (c) telephone instruments FALSE; Plastic is suitable for building large and heavy structures. (b) cotton (b) therniosetting plastic True or False. (b) nylon Question 12. TRUE ? The biggest difference between a thermoplastic and thermoset is that a thermoplastic can be recycled. False 14. (a) cellulose Natural substance is: 5. Question 14. (c) polythene (c) telephone instruments (a) strong (b) non-corrosive (a) steel Cellulose polymer is present in wood, Question 27. (a) nylon ... State whether the following statements are True or False: Question 1. Students can solve these Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers and assess their preparation level. Question 8. Cotton clothes are more comfortable during hot/humid weather. True 11. (d) wood Question 9. The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. (a) aluminium foil PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Question 9. Synthetic fibres are synthesised from raw material called …………………. 13. B (CH 2 OH) 2. (c) polythene (c) nylon Most Polymers Used In 3D Printing Applications Are Thermoplastic. ... False. Question 5. A material which gets decomposed through natural processes, such as action by bacteria, is called …………………. Question 15. How many candles are on a Hanukkah menorah? Polymer present in wood is: Which of the following statements is false? (d) none of these. 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