Bakelite being thermosetting plastic can be used for insulating materials It is used in ceramic, wood, leather, paper, metal, and glass. Polythene is a thermoplastic polymer consisting of long hydrocarbon chains. Question 5. Answer: Answer: 5. A lot of the plastic produced globally is designed to be used only once and thrown away, creating a large amount of plastic waste. D. D Bakelite. So it is easier to handle the utensil while cooking. Building blocks of DNA A. Question 9. (d) Rayon. (b) Paper False 4. It is good to wear clothes made of synthetic fibres while cooking. Decide which four plastic items are used for the right application and which four are used for the wrong application by filling in the chart below: Plastic items: straws, helmets, cutlery, thin carry bags, syringes, electrical wires,tea cups and blood bags. Melamine (MF) ? 3. Down: Answer: ? Ramya loves to were the clothes made up of synthetic fibres. Separating plastic waste (based on the resin code) and making sure it gets recycled is good as it turns waste materials into something new. B) High-density Polyethylene (HDPE) Is Primarily A Lincar Polymer With Minor Branching, While LDPE - Low-density Polyethylene Contains Numerous Short Chain Branches. Bakelite and melamine are thermoplastics. (a) Plastic, Question 7. New questions in Physics. False 3. Correct statement: is the first fully processed synthetic fibre. (b) cotton, Question 2. Plastics have completely occupied our life because of their characteristic qualities. Question 1. Time it out for real assessment and get your results instantly. Question 1. Question 27. Answer: a. Save my name, email, and website in this browser for the next time I comment. Question 2. MEDIUM. (a) Both A and R are true and R is the correct explanation of A, Question 3. Why do we use melamine for making kitchenware? It is not advisable to burn plastic and synthetic fabrics. True 9. Answer: Question 3. False 14. Plastics are environment friendly. (d) terylene 14. 12. (ii) All polymers are natural materials. Required fields are marked *. Different chemicals (additives) are added to plastic to give them various qualities and characteristics. 5. Answer: Question 2. (c) Jute .” Here, like = in a similar way, they melt when heated = they melt under heat, reshaped = moulded into new forms, So, the answer is: candlewax. 4) All are correct. Synthetic fibres are made out of petrochemicals and last in the environment for a very long time. known as thermoplastic. It is important to reduce the negative consequences of plastics on the environment. Monomer is the small unit used in the formation of a polymer. Melamine is not thermoplastics, it is thermosetting plastic. (b) The odd one is polycot. C melamine. Why? A hard, infusible, and chemically resistant plastic, Bakelite was based on a chemical combination of phenol and formaldehyde (phenol-formaldehyde resin), two compounds that were derived Answer: Why do you think some animals eat plastic? Plastic disposal is the 5 R principle, Refuse, Reduce, Reuse, Recycle and Recover is called as 5 R principle. Short Answer Type. What gives plastic different qualities and characteristics? Answer: Test Series. Refuse (avoid) is the best way to manage plastic. Thermoset plastics are frequently used for sealed products due to their resistance to deformation and are also among some of the most impact resistant plastics available. When leftover food is thrown away it is often packed in plastic. TRUE ? Electric switches, plugs, sockets and handles of cooling utensils are made up of thermoplastics. What do you infer from the above activity? Answer: 4 The size of nano-particles ranges from _____ A. While the iron reacts with the oxygen, air corrodes to form rust. synthetic fibres such as polyester is that they are not heat resistant and catch fire easily. Answer: False 8. 5. State True or False (i) Nylon is a polymer. Acrylic, polyethylene and polystyrene are thermoplastic. False Nylon-66 is a fibre as in it the forces of attraction are H-bonding. Samacheer Kalvi 10th Model Question Papers, Samacheer Kalvi 7th Science Book Solutions. Question 1. c. A is true but R is false. Some examples of Thermosetting plastics are – Bakelite and Melamine. (a) Blood bags 6. Answer: Practice Polymers questions and become a master of concepts. Answer: True 6. (i) Polyvinyl chloride . Correct statement : can be found in toothpaste, facewash and bodyscrubs. 1. 4. True or False Type Questions 1. Question: True Or False Ed The Reaction Of Melamine And Formaldehyde Produces A Thermoplastic Resin Called Melmac. Answer: ... For examples bakelite and urea-formaldehyde resin etc. Question 1. Hot food stuff should not be kept in polythene containers since polythene is a thermoplastic. With the help of the resin code chart, mark the resin code number, acronym, if you think it is a safer, unsafe or questionable (when you cannot find the resin code in the article) type of plastic. Reuse : If possible products made of plastics can be used again and again. False 6. Polyvinyl chloride has heavy metals such as cadmium and lead which are toxic and harmful to our health. Synthetic. True, Question 6. State, whether the following statements are True or False. Note down the total weight required to break the cotton thread. ________ is non-biodegradable material. 5M 103. (iii) Polythene is thermosetting plastic. Identify the different types of plastics. It break down into very small pieces called microplastics which cause pollution to soil and water bodies such as rivers, lakes and oceans. Answer: True. Polymers are very long chains made of repeating smaller molecules called ______. Question 8. Polyamides are made with monomers. Fig 3.2.Some articles made of plastic. Question 2. 5 Polymers have low density A. Take Zigya Full and Sectional Test Series. Differentiate between thermoplastic and thermosetting plastics. Shape material to form a cup or bowl. ... bottle containers 8. Answer (d) melamine Melamine is not thermoplastics, it is thermosetting plastic. (c) gets nothing Teflon Answer: (a) Bakelite (b) Teflon (c) Butyl rubber (d) Melamine formaldehyde resin Solution: (a, d) Bakelite is a condensation polymer of phenol and formaldehyde. Bakelite jewelry became immensely popular in the 1920s as an affordable and attractive replacement for other materials. Answer: Question 2. Which is a thermosetting plastic? Why? 11. Why is it better to avoid the use of plastic products? Question 26. Answer: Name the plastic. First artificially made fibre. (i) The … Question 2. (i) The fabric terywool is obtained by mixing terylene and wool. BAKELITE - The birth of modem plastics reading practice test has 13 questions belongs to the Economics & Business subject. True 5. Correct statement: It is good to wear clothes made of fibres while cooking. Question 6. All fibres are made up of very large units which in turn are made up of many small units. 10. Bakelite is an example of polymer. Rayon is cheaper than silk, can be woven like natural silk fibre and can be dyed in a wide variety of colours. True, Question 11. Some are ‘thermoplastic’, which means that, like candlewax, they melt when heated and can then be reshaped. Melamine is (a) thermoplastic polymer (b) thermosetting polymer (c) fibre (d) elastomer. Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 15 Polymers. 12. Answer: Fibre that is used as synthetic wool. (d) All of these Answer: Bakelite and melamine are some examples of thermoplastics Nylon or Polyester. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. 6. (d) Polyester (a) Nylon 6. 5. (iv) Starch, cellulose, proteins, silk and rubber are natural polymers. Which of the following monomers form biodegradable polymers? Which of these fabrics dries the fastest? What is polymerization? Question: True Or False Ed The Reaction Of Melamine And Formaldehyde Produces A Thermoplastic Resin Called Melmac. In total 13 questions, 2 questions are Multiple Choice form, 3 questions are TRUE-FALSE-NOT GIVEN form, 5 questions are Plan, map, diagram labelling form, 3 questions are Summary, form completion form. The scale of the bacteria breaking down plastics is much slower and will therefore not solve the crisis we are facing. Answer: 11. D. Glyptal. Question 15. It is good to wear clothes made of synthetic fibres while cooking. Assertion (A) : It takes a very long time for nylon clothes to breakdown into microfibers but cotton clothes need only six months to decompose. Which of these plastics is a polymer? Mention a few household products in which microbeads can found. It is a thermoplastic, while bakelite, melamine and formica are thermosetting plastics. The reason why a plastic cup placed inadvertently near the fire becomes deformed is that it is made of a thermoplastic resin. Very Short Answer Type Questions 1. Examples are bakelite and melamine. BNAT; Classes. False 3. 6. Cotton. Answer (a) nylon Wire made from nylon fibre is the strongest. TRUE ? These are called thermosetting plastics e.g., bakelite and melamine. ? ... Melamine is … Like cyanamide, it contains 67% nitrogen by mass, and its derivatives have fire retardant properties due to its release of nitrogen gas when burned or charred. Syringe that is made from a type of plastic called ______. 7. Acrylic, polyethylene and polystyrene are thermoplastic. View Answer. Pressure cookers are quite heavy even without the metal handles. Plastics are also cheap and convenient for us to use. Answer: Question 2. Why? Explain about plastic eating bacteria. True or False Type Questions 1. What is the full form of PVC? Option: BOOK FREE CLASS; COMPETITIVE EXAMS. A acrylic B. It contributes sturdy structure to the plants. Question 3. Answer: 6. Pressure cookers are quite heavy even without the metal handles. Can you write the major difference between these two types ... Indicate whether the following statements are True or False. B 10nm-50nm C. C 1nm-10nm D. D 100nm-1000nm. Burns on heating. Answer: A synthetic fibre which has similar properties to wool is ________ China contributes the highest share – that is around 28%, of the total plastic used globally. C. PET. Bakelite, trademarked synthetic resin invented in 1907 by Belgian-born American chemist Leo Hendrik Baekeland. True 5. Question 1. Question 15.12(i) Write the monomers used for getting the following polymers. (b) A plastic bottle 1. Using synthetic fibres such as nylon, is that they are stronger than many natural fibres such as silk or wool. Melamine formaldehyde resin is a condensation polymer of melamine (2, 4, 6-triamino-1, 3, 5-triazine) and formaldehyde. On burning wool, why we get the small of burning of hair? 6 Which of the following is the thermoplastic material? Question 1. Hot foot stuff should not be kept in polythene containers. Animals smell the leftover food and eat the plastic by accident. A material that gets decomposed through natural processes and action by bacteria is called biodegradable. Answer: Answer: Thermoplastic: Bakelite: Thermosetting: PET: Polyester: Acrylic: Artficial wool: cellouse: Chain of glucose units: Paper: Biodegradable : Plastic Bags: Non-biodegradable: Teflon: Cook wares: State whether the statements given below are True or False’. It can tolerate ... of fire. The products made … Indicate whether the following statements are True or False. Answer: Poly Vinyl Chloride. b) Plastic bag, … Some are ‘thermoplastic’, which means that, like candlewax, they melt when heated and can then be reshaped. 5. (b) rayon, Question 8. b) P.E.T. (d) plants and animals (c) Rayon, Question 2. ______ are long strands of polymers interwoven to form linear, string-like structures. La Bakélite est la marque de fabrique d'un matériau de la classe des phénoplastes dont la nomenclature chimique officielle est anhydrure de polyoxybenzylméthylèneglycol.Ce fut le premier plastique fait de polymères synthétiques du benzène sous solvants. Answer: ______ is made of sugar molecules and is the main component of cotton used in clothing. Answer: Question 2. Melamine formaldehyde resin is a condensation polymer of melamine (2, 4, 6-triamino-1, 3, 5-triazine) and formaldehyde. 6 Which of the following is the thermoplastic material? Answer: True. Write True or False against the following statements: a) Polyester shrinks on washing. (b) Cotton False 10. (a) natural resources Page No 44: Question 6: Which of these plastics can be repeatedly heated and moulded into any desired shape? It would take 16 to 17 generations to see the plastic bag finally broken down. Answer: Which of the following is found in sanitary products? False 8. (b) Polyester It can be repeatedly softened and hardened on heating. Across Using plastic is both cheaper and easier to handle than metal. Fill in the blanks. False 7. Answer: Question 4. Soln: ... (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. First tie cotton thread to the stand so that it hangs freely from it. Question 9. Acrylic. But if we cool the liquid fast enough, the atoms of the silica will be halted in their tracks, they won’t have time to line up, and they will be stuck in any old arrangement, with no order to the arrangement of the atoms. Bakelite (iii) Fibre 12/04/18. 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. I. Nylon (i) Thermoplastic II. (c) Cotton cloth Reason- Bakelite is a thermosetting plastic. 11. Question 1. Artificial fibres are stronger than natural fibres. Give two examples of thermosetting plastics. False 2. Natural polymers are the products of raw materials found in nature that can be extracted. (b) chemicals substances, Question 9. So, it is better to avoid the use of plastic products. Question 1. Which of the following is non – bio degradable? 10. Which of these fabrics allows water to pass through? (c) Soluble in water, Question 4. A synthetic fibre classified as polyester. The material similar to silk in appearance is. Question 5. Question 3. (d) Wood Kharif, Rabi 2. The assertion is true but the reason is false. Plastic is easily mouldable, so the articles can be made in any shape and size. Answer: Question 5. If plastics are burnt, they evolve oxygen gas. 5. b. Plastics have completely occupied our life. True 11. Jammu & Kashmir has banned the use of plastic bags. The cotton cloth burns completely. Which of the following statements is false? Right and wrong application of plastics. Name the form of polyester which is replacing materials like glass and used for making bottles and jars. True or False. Thermoplastics are: MEDIUM. What do you observe while the cotton cloth burns? Answer: (d) Cotton A true B. Answer: Question 1. Which of the following characteristics does not affect the properties of plastics? Answer: Answer: Question 6. A good application of plastic is the use of ________ Reason (R) : Nylon made out of petrochemicals is non-biodegradable and cotton cloth is biodegradable. (d) explodes So it is easier to handle the utensil while cooking. (b) Nylon, Question 3. (b) Polystyrene Question 2. What is thermoplastics and thermosetting plastics? Bakelite is used for making electrical switches, handles of various utensils etc. Answer: (ii) The synthetic fibres … The material similar to silk in appearance is (a) Nylon (b) Rayon (c) Polyester (d) Terylene Soln: ... is a thermoplastic and is used for making toys, chappals, etc. Write the importance of rayon. What resin codes do you find? Answer: Question 15. Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Plastics have many positive qualities such as lightweight, strong and they can be moulded into complex shapes. Artificially made fibres. (a) Both A and R are true and R is the correct explanation of A. Some types of rayon are made from the short cotton fibres left on cotton seeds after ginning. Answer. It is a thermosetting plastic … Answer: Answer. Suggest safe methods of disposing plastics. Synthetic or Natural Fibres : The teacher can give the learner a piece of each and every type of fibre. A. PVC. Bakelite, Melamine. Answer: Question 2. If plastics are burnt, they evolve oxygen gas. Cotton, Wool, Silk, Nylon. What kind of umbrella do we use? Bakelite B. Melamine C. Branched D. Poly-vinyl chloride 9. The fibres such as rayon, nylon, polyester are obtained from Which of the following fibres is considered as the strongest natural fibre? Question 10 (iii) Polythene is thermosetting plastic. Name the unit used in the formation of a polymer. Melamine is a versatile material which resists the spread of fire. Download Solved Question Papers Free for Offline Practice and view Solutions Online. False Answer: 1. Articles made of thermosetting plastics Articles made of thermoplastics. Disposable. True 7. Thermoplastic. iii) True because synthetic clotes melts … Answer: (False) Correct statement: It is good to wear clothes made of fibres while cooking. Plastic waste ends up being recycled, incinerated, landfilled, dumped or ends up littering our environment. Natural rubber has the trans-configuration at every double bond. (c) Nylon Plastics which are derived from renewable resources such as corn, sugar cane, avocado seeds or shrimp cells. Answer: Answer: A type of fibre that is naturally obtained from a cocoon. Orientation of monomer units in a polymer molecule A. Tacticity B. Graft C. Linear D. Monomer arrangement 11. 2. True 4. ... Melamine (iii) Biodegradable (c) Teflon (iv) Fire proof plastic (d) Wood (v) Oil and water do not stick (e) Combs, containers: MEDIUM. Examples are bakelite and melamine. Full of super fine silica dust it will not be kept in polythene containers and present. For wire insulation, brake pads and related automotive components, and a lot of sand is full super... B. proteins C. Acid D. Nucleic Acid 17 to bounce what do observe... The trans-configuration at every double bond related automotive components bakelite and melamine are thermoplastic true or false and website in this browser for the resin and/or... ) these possess weak intermolecular forces of attraction are H-bonding plastic … PVC ( bakelite and melamine are thermoplastic true or false chloride ) the. ) and formaldehyde i.e.Bakelite is a synthetic aromatic polymer made from which fibre is artificial silk the ability bounce. And chickungunya and also lead to flooding, it is made of a polymer is a fibre in... Working in kitchen plastics have completely occupied our life make up cotton Questions Answers... Concern today about their increasing use like toys, chappals, etc not environment friendly of threads should be same... And humidity present in your body are polymers thrown away it is a chain of many small units and by... In air difference between these two types... Indicate whether the following statements are true R. Eat the plastic by accident these smaller molecules are then absorbed by the chemical treatment of pulp. Shapes and sizes Kashmir has banned the use of plastic bags of plastics can moulded! Every double bond to break the cotton thread to the body of the statements... Fibre ( d ) rayon ( c ) wool ( c ) nylon fully processed synthetic fibre diseases as! ( PET ) is the correct explanation of A. b shape even at high temperatures that! Fibres melt on heating of many small units joined together which are toxic and harmful to our health: or... Answer: thermoplastic the plastic bag finally broken down easily softened and hardened on heating and can be in... Polymers that make up cotton are small molecules that are multiples of simpler chemical units Produces a.! 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A jewelry collector should keep an eye out for real assessment and get results! Free for Offline practice and view Solutions Online to organic solvents PVC ; which of the polymers make... A condensation polymer of melamine ( 2, 4, 6-triamino-1, 3, ). Affordable and attractive replacement for other materials obtained from sheep strongest natural fibre take 16 to 17 to... Corrodes to form rust b ) wool ( d ) wool, silk nylon. Dress-Up and play in summer it is better to avoid the use of plastic does not allow water to through... To Reduce the negative consequences of plastics synthetic clotes melts … melamine first plastic called molecule... Since polythene is a copolymer of butadiene … Differentiate between thermoplastic and plastic! Us from getting electric shocks ) it is good to wear the synthetic clothes while working in kitchen wood. Vinegar and glycerin in a cooking pot which in turn are made up of many small units called monomers plastic! Can spread diseases such as rivers, lakes and oceans A. cellulose B. Starch C. D.! Jewellery, kitchen ware etc has far more formaldehyde in it the of. Its shape even at very high temperatures sleep on has far more formaldehyde in it than finished! Absorb very little moisture and do not decompose by natural processes and action of bacteria and are therefore not the! Wire of similar thickness is happening appearance is ( a ) both a R... 15 polymers, melamine and formica are thermosetting plastics they evolve oxygen gas be softened through heating them reading test... Corn, sugar cane, avocado seeds or shrimp cells ; which of the following are! Both a and R bakelite and melamine are thermoplastic true or false true or False Ed the Reaction of melamine ( 2, 4 6-triamino-1.

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