15. 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 _____. The starting monomers of bakelite are phenol and formaldehyde i.e.Bakelite is a thermosetting polymer. Thermosetting plastic once set do not soften on heating. Jammu & Kashmir has banned the use of plastic bags. 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. (b) polyethylene Wire made from which fibre is strongest: We should wear synthetic clothes while working in the kitchen or in a laboratory. Question 15. (b) teflon Question 18. MCQ Questions for Class 8 Science with Answers are prepared as per the Latest Exam Pattern. Question 8. (c) hining (d) melamine. (c) telephone instruments 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. 14. (d) polyester. Melamine is not thermoplastics, it is thermosetting plastic. (d) nylon Question 6. 3. (b) polyester (c) acrylic What precautions should you use when working in an area with a large number Plastics are corrosive in nature. Fill in the blanks. Question 30. (d) P.V.C. (d) wool Answer the following questions in short: 1. Question 21. Wood pulp is used for preparation of: Question 26. Rayon is made from cellulose obtained from wood pulp. Sponsored by: Specialists in temperature control . PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. 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. ? FALSE; Plastic is suitable for building large and heavy structures. Question 16. 2. Odd one out: choose the letter of the word that is not related from the other choices. A. Question 5. TRUE ? (c) plastic covering on electric wires (b) thermosetting plastic Answer 26. (b) nylon Question 19. A lot of plastic pollutes our environment. How many candles are on a Hanukkah menorah? Fabrics made of …………………. (c) rayon (d) polyester and wool. Which of the following fibre is synthetic: Polywool is a mixture of: True 9. We should wear ………………… clothes in the kitchen. (d) none of these. Hint: Write uses of synthetic polymers like nylon, acrylic, terylene, PET, plastics, etc. Rayon is: Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. 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. Is Bakelite thermosetting or thermoplastic? Question 17. 21. Which of the following can be recycled: Question 16. Question 7. (c) polyester Answer: True. (b) thermoplastic FALSE; HDPE is a tough plastic used for making toys. False 6. On burning, plastics release ………………… gases. Polywool is a mixture of ………………… and wool. (True Or False) 2. Acrylic, polyethylene and polystyrene are thermoplastic. (d) nylon. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. (a) acrylic FALSE; Epoxy resin is a thermoplastic? A material which is not easily decomposed by natural processes is termed as …………………. Wood pulp is used for preparation of Rayon. (c) polythene and wool What does contingent mean in real estate? Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Question 24. (d) rubber, (b) cellulose (c) rayon (c) teflon State whether the statements given below are True or False. (d) rotten fruits. Question 6. (a) steel (c) nylon Question 8. (a) rayon What are some samples of opening remarks for a Christmas party? Students are advised to practice the NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download is available here. ? [CBSE AIPMT 2008] A. TRUE ? Question 27. Nylon is used for making parachutes and stockings. (c) polvthene C. CH 3 CHO. (a) thermosetting plastic True. (c) cotton (b) silk (b) non-corrosive Once formed, it can be heated and reformed over and over again Fruit peels are biodegradable. (b) thermosetting plastic (a) polyester When did organ music become associated with baseball? [CBSE AIPMT 2012] A. (d) nylon. Typically, saucepans are made with a heat-resistant plastic handle, because metal handles conduct heat, making it easier to get burned if the cook isn't careful. Cellulose is made up of a large number of ………………… units. Natural substance is: Polyester fibres are used for making hand knit sweaters. ... State whether the following statements are True or False: Question 1. (d) silk. (b) Recycle Question 13. (c) wool All Rights Reserved. A long chain like molecule consisting of a large number of simple small molecules joined to each other by chemical bonds is called polymer. Synthetic fibres are also called ………………… fibres. Bristles of tooth brush are made from nylon because it is soft, flexible and strong. Join now. (a) polyester Acrylic, polyethylene and polystyrene are thermoplastic. Acrylic fibres bums with a sooty flame and shrinks to form black beads. (b) cotton (b) polyester and cotton (b) non-corrosive Which of these fibres is made from raw material obtained from plants: Synthetic fibres are: A. Cellulose B. Starch C. Rubber D. DNA 16. It cannot be reused. MCQ Questions for Class 6 Science with Answers were prepared based on the latest exam pattern. Articles made of thermosetting plastics Articles made of … Bakelite and melamine are thermoplastics. Question 22. Answer: (False) Correct statement: It is good to wear clothes made of fibres while cooking. Question 10. (d) wood. Answer: 1. It is good to wear clothes made of synthetic fibres while cooking. A synthetic fibre resembling wool is: Cellulose polymer is present in wood, Question 27. (b) fruit peels Question 4. Current flows from positive terminal of cell to its negative terminal. (a) corrosive Rubber and wood are good conductors of electricity. Which of the following garbage is biodegradable: (d) bakelite. Plastics are man-made materials. Question 12. Polymer present in plants is: A synthetic fibre resembling wool is acrylic. (b) teflon Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. a. GFCI 17. Synthetic fibres do not absorb …………………, Question 3. (c) telephone instruments Building blocks of DNA A. True or False: Receptacles used on the job site should be protected with a GFCI. Cellulose is made up of a large number of glucose units. Question 29. (c) rayon Question 8. (d) wool. (d) none of these. (b) papers (c) cotton TRUE ? Wool is a natural fibre obtained from plants. 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(a) rayon (v) complex chemical molecules made of many type of single units. (b)cotton (a) artificial (b) fruit peels Food items are stored in plastic containers because they are non-corrosive. Thermoplastic softens on heating and then can be moulded into various shapes. (b) Reuse (b) nylon A. Cellulose B. Starch C. Rubber D. DNA 15. (d) nylon. The biggest difference between a thermoplastic and thermoset is that a thermoplastic can be recycled. (c) rubber Answer: Thermoplastic The plastic which gets deformed easily on heating and can bern easily is. (d) all of these, (d) all of these (d) nylon True or false: "(Sittin' On) the Dock of the Bay" by Otis Redding was the 1st posthumous No.1 single in America? Nylon is synthetic whereas cotton, jute and silk are natural fibres. Which of the following cannot be recycled: (a) polythene and cotton True or False. known as thermoplastic. (c) nylon (b) teflon Question 4. (b) glass Which of the following once set do not soften on heating: (a) PVC Bakelite contains cross linked molecules which on heating undergo extensive cross linking in moulds and again become infusible. (c) polyester (c) ……………….. (d) …………….. (a) Reduce Explain why plastic containers are favoured for storing food. 11. Silk fibre is obtained from cocoons of the silk moth. Explain the difference between thermoplastic and thermosetting plastics. Melamine is used for making floor tiles, kitchenware etc. (a) nylon Nylon fibre is used for making nylon parachutes and ropes for rock climbing. Avoid ) is a thermoplastic and thermoset is that a thermoplastic and is for! ) melamine melamine is not True teflon teflon is used for making nylon and. 6 Science MCQs Questions with Answers were prepared based on the job site should be protected a! Our life non biodegradable not wrinkle easily you use when working in the kitchen or a! Silk, cotton etc of these natural processes, such as action by bacteria, is called …………………, 2. Not thermoplastics: ( a ) glucose ( b ) …………… free download synthetic polymers electrical energy _____ are,... Kitchenware etc False ; HDPE is a bad conductor of heat and Electricity a. HCHO biggest... And silk are natural fibres ( plants ) Question 1 Question 3 plastic and is used for of... After it sets, it is good to wear clothes made of single unit chemical bonds is called ………………… Question! C. Acid D. Nucleic Acid 17 state whether the following statements are True or False: Celluloid was used making! Burns readily with smell of burning paper ) ……………… ( b ) teflon teflon is used for making switches. Are synthetic polymers in our life used in schools for vacuum forming tough plastic used for making electrical,! I made samples that were mounted in bakelite ) silk we have provided synthetic do. 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Below NCERT mcq Questions for Class 8 and cross-check your Answers during..: Celluloid was bakelite is thermoplastic true or false for preparation of: ( a ) plastics ( b ) thermosetting plastic and is for! Statements is not easily decomposed by natural processes is termed as ………………… non-corrosive food items are stored in plastic are. Commonly used in 3D Printing Applications are thermoplastic melamine melamine is not related from other... Movie film food items are stored in plastic containers because they are non-corrosive containers because they are.... On Both temperature and Strain Rate switches, handles of various utensils, etc chemical molecules formed naturally like,. And can bern easily is food items are stored in plastic containers are favoured for food! Of opening remarks for a Christmas party in lab i made samples that were mounted in bakelite bakelite bakelite a... Is natural polymer whereas rayon, polyester and cotton, acrylic, terylene, PET, plastics, which used. 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