BAKELITE - The birth of modem plastics reading practice test has 13 questions belongs to the Economics & Business subject. Melamine is (a) thermoplastic polymer (b) thermosetting polymer (c) fibre (d) elastomer. Cellulose, Starch, etc. All other given statement are true. What gives plastic different qualities and characteristics? I think the modern foam mattress that people sleep on has far more formaldehyde in it than any finished Bakelite product would. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Bakelite continues to be used for wire insulation, brake pads and related automotive components, and industrial electrical-related applications. Artificial fibres are stronger than natural fibres. Nylon thread is the strongest thread. (a) bakelite (b) polythene (c) formica (d) melamine. It is important to reduce the negative consequences of plastics on the environment. (i) A polymer is a chain of many small units joined together which are called _____. A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. True 7. Why is rayon called on artificial silk? So, she advised here not to wear synthetic clothes while working in kitchen. Why is it better to avoid the use of plastic products? Synthetic fibres are made out of petrochemicals and last in the environment for a very long time. … Bakelite (iii) Fibre 12/04/18. (c) PVC (b) Polythene 6. B (CH 2 OH) 2. True B. Answer: Poly Vinyl Chloride. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. (a) Both A and R are true and R is the correct explanation of A. Why? (a) Paper (c) Acrylic PVC; Which of the following is used to manufacture carrier bags? FALSE; Which of the following is commonly used in schools for vacuum forming? Natural polymers are the products of raw materials found in nature that can be extracted. 37. Using plastic is both cheaper and easier to handle than metal. synthetic fibres such as polyester is that they are not heat resistant and catch fire easily. A good application of plastic is the use of ________ 5. ... Melamine (iii) Biodegradable (c) Teflon (iv) Fire proof plastic (d) Wood (v) Oil and water do not stick (e) Combs, containers: MEDIUM. BAKELITE - The birth of modem plastics reading practice test has 13 questions belongs to the Economics & Business subject. (d) All of these Examples are bakelite and melamine. Look at the list of eight plastic items. Rayon is cheaper than silk and can be woven like silk. B) High-density Polyethylene (HDPE) Is Primarily A Lincar Polymer With Minor Branching, While LDPE - Low-density Polyethylene Contains Numerous Short Chain Branches. True; False, synthetic fibres melt on heating; True ; False, most of the plastics are non biodegradable. (ii) Synthetic fibres do not melt on heating. Question 8. All other given statement are true. If plastics are burnt, they evolve oxygen gas. Melamine formaldehyde resin is a condensation polymer of melamine (2, 4, 6-triamino-1, 3, 5-triazine) and formaldehyde. (a) Melamine, Question 6. (v) Polyethylene terephthalate (PET) is used in making clothes. is a good conductor of electricity. (d) plants and animals True or False. Answer: Question 5. Question 2. Question 2. Bakelite is an example of polymer. (a) Both A and R are true and R is the correct explanation of A, Question 2. 5M 104. Note down the total weight required to break the cotton thread. Question 3. FALSE; HDPE is a tough plastic used for making toys. Question 10. Nylon-66. The process by which monomers are linked together by covalent bonds to form polymers is called polymerization. Teflon (c) Acrylic, Question 5. BNAT; Classes. The scale of the bacteria breaking down plastics is much slower and will therefore not solve the crisis we are facing. Another name for this semi-synthetic fibre is artificial silk. Answer: ... Thermoplastic 8. low absorbity of water 9. Polymer, any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units. Thermoplastic: Bakelite: Thermosetting: PET: Polyester: Acrylic: Artficial wool: cellouse: Chain of glucose units: Paper: Biodegradable: Plastic Bags: ... Teflon: Cook wares: State whether the statements given below are True or False’. Pick the synthetic fibre out of the following. It is also used in other products like toys, jewellery, kitchen ware etc. B 10nm-50nm C. C 1nm-10nm D. D 100nm-1000nm. Question 26. (d) Rayon. Answer: Answer: Question 1. The best thing to do is to avoid using plastic products. Refuse (avoid) is the best way to manage plastic. Question 4. [CBSE AIPMT 2008] A. (a) melts Thermoplastic. Bakelite is an item a jewelry collector should keep an eye out for considering how prices have risen over the last few decades. Question 3. Answer: Melamine is used for making floor tiles, kitchenware etc. 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 be mixed with cotton to make bed sheets or with wool in the production of carpets and home furnishing products. Hence these plastics cannot be reprocessed and they can maintain their shape and size even at very high temperatures. Answer: It would take 16 to 17 generations to see the plastic bag finally broken down. Plastics are environment friendly. Using synthetic fibres such as nylon, is that they are stronger than many natural fibres such as silk or wool. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Cotton is a natural polymer. There are some plastics which once they are moulded, cannot be softened through heating them. All fibres are … Jammu & Kashmir has banned the use of plastic bags. ______ is a synthetic fibre which is strong and elastic that it has the ability to bounce. What kind of fabric is suitable to dress-up and play in summer? (b) Wool (i) The … True 6. All fibres are made up of very large units which in turn are made up of many small units. Many animals confuse plastic for food and eat it by accident. Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Bakelite. (b) A plastic bottle Answer: (ii) All polymers are natural materials. ... toys, chappals, etc. Answer: VIII. A natural fibre obtained by boiling of cocoons is called ______. Why Question 3. (c) polyester (d) Wool, Question 7. Answer: 6. Download Solved Question Papers Free for Offline Practice and view Solutions Online. Suggest safe methods of disposing plastics. It was obtained by chemical treatment of wood pulp. Write True or False against the following statements: a) Polyester shrinks on washing. (a) Plastic Answer: Bakelite and melamine are thermoplastics( true or false) - 14613642 1 ... School +5 pts. Answer: A type of fibre that is naturally obtained from a cocoon. 7. 6. Down: Which are true for elastomers? The increase in the use of plastics, particularly the one-time use and throw away plasticshas serious impacts on the environment, animals and our health. ? False 7. It is one of the first thermosetting plastic made from synthetic components .Because of its excellent insulating properties it is used in radio, telephone casings etc. 1) They posses electricity. Bakelite, Melamine 10. Question 3. Most synthetic fibres absorb very little moisture and do not allow air circulation making them hot and uncomfortable to wear. Why? ________ is non-biodegradable material. Question 2. Bakelite and melamine are some examples of thermoplastics Animals smell the leftover food and eat the plastic by accident. Why then is there concern today about their increasing use? Explain about plastic eating bacteria. A lot of plastic pollutes our environment. To which class, thermoplastic and thermosetting does bakelite belong? 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. Cotton: natural:: Polyester: ______ (ii) The synthetic fibres … ... Melamine is … PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Correct statement: Electric switches, plugs, sockets and handles of cooling utensils are made up of thermosetting plastic. True or False Type Questions 1. Why do you think some animals eat plastic? Answer: First artificially made fibre. Which of the following monomers form biodegradable polymers? A. PVC. Building blocks of DNA A. A ______ is a long chain made up of many repeated small units called monomers. What do you infer from the above activity? 5. Which of these fabrics dries the fastest? Repeat the same activity with the wool, silk and nylon threads. A synthetic fibre which has similar properties to wool is ________ Correct statement: is the first fully processed synthetic fibre. Question 4. 7 Which of the following is the chemically inert to organic solvents? it is a kind of plastic which once moulded cannot be moulded again. (a) Melamine Answer: TRUE ? Question 7. Polyamides are made with monomers. Let the article cool for 24 hours before we use it. Answer: Answer: Answer: The reason why a plastic cup placed inadvertently near the fire becomes deformed is that it is made of a thermoplastic resin. Also write the false statements in their correct form. Answer: (False) Correct statement: It is good to wear clothes made of fibres while cooking. Question 15. Natural, synthetic III. China contributes the highest share – that is around 28%, of the total plastic used globally. Nylon. LDPE ( Low Density PolyEthylene) ? D. D Bakelite. 3) Vulcanization rubber is an example of elastomers. Question 5. Why? Hint: Write uses of synthetic polymers like nylon, acrylic, terylene, PET, plastics, etc. Answer: 5. D. D Bakelite. False 3. Answer: Question 2. Bakelite B. Melamine C. Branched D. Poly-vinyl chloride 9. Answer: We have seen garbage dumps with different plastics. Question 1. BeTrained.in has solved each questions of NCERT Exemplar very thoroughly to help the students in solving any question from the book with a team of well experianced subject matter experts. Acrylic, polyethylene and polystyrene are thermoplastic. Activity 3, 4. Melamine. Answer: Bakelite and melamine are thermoplastics. Answer: Answer: Thermoplastic The plastic which gets deformed easily on heating and can bern easily is. 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. (a) Nylon False 2. (b) Plastic cutlery Degradable plastics break down into tiny pieces called microplastics. 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. A long chain made of small repeating monomers. Join together to form polymers. C. PET. Some types of rayon are made from the short cotton fibres left on cotton seeds after ginning. B) High-density Polyethylene (HDPE) Is Primarily A Lincar Polymer With Minor Branching, While LDPE - Low-density Polyethylene Contains Numerous Short Chain Branches. (c) Jute Answer: known as thermoplastic. Refuse (avoid) is the best way to manage plastic. Melamine (MF) ? TRUE ? Take Zigya Full and Sectional Test Series. What do you observe while the cotton cloth burns? The material similar to silk in appearance is (a) Nylon (b) Rayon (c) Polyester (d) Terylene. True, Question 5. Answer: B epoxy C. C melamine. When she was working in kitchen, her mother advised her not to wear the synthetic clothes. ... Bakelite. Answer: Odd one out: choose the letter of the word that is not related from the other choices. Continuously mix on medium heat until the liquid turns clear. Answer. At the free end, attach a CD as plate so that weights can be placed on it. State True or False. Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 15 Polymers. 2. Then it will not be thrown away in landfills, open dumps or ending up as litter in the environment. Answer: (c) Polythene What does the term biodegradable mean? Answer: Question 3. Reason (R) : Nylon made out of petrochemicals is non-biodegradable and cotton cloth is biodegradable. Name a natural polymer occuring in plants. Answer: Which of these fabrics allows water to pass through? Answer: Answer: D. Glyptal. False 6. So, it is better to avoid the use of plastic products. Nylon was also known as artificial silk in China. B false. V) Bakelite is an examples of-----. Get NCERT Exemplar Solutions for Class 12 Chapter Polymers here. 1. When the liquid begins to bubble it is ready to be taken off the stove. When leftover food is thrown away it is often packed in plastic. 14. 6 Which of the following is the thermoplastic material? 6. false, false, true, true, true. Arrange the threads in the order of increasing strength. Is the resin code safer, un safe or questionable? Bakelite: Thermosetting plastic: 4. If we cooled it slowly, the atoms would slowly line up back into their crystalline arrangement. (d) Nylon How do plastics impact animals and the environment? Let the article cool for 24 hours before we use it. 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. Question 1. 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. Answer: State, whether the following statements are True or False. 4. True, Question 6. Bakelite jewelry from this era often had striking patterns, such as polka dots and chevrons, and it could be carved into intricate shapes. 5M 104. Very Short Answer Type Questions 1. Question 27. .” Here, like = in a similar way, they melt when heated = they melt under heat, reshaped = moulded into new forms, So, the answer is: candlewax. Which of the following is non – bio degradable? Others are ‘thermosetting’: like eggs, they cannot revert to their original viscous state, and their shape is thus fixed forever, Bakelite had the distinction of … Answer: Question 6. The assertion is true but the reason is false. A 0.1nm-100nm B. ______ and ______ are the building block monomers that make up many different types of plastics. Hot foot stuff should not be kept in polythene containers. Question 15.12(ii) Write the monomers used … The fibres such as rayon, nylon, polyester are obtained from (c) Cotton cloth Polymer, any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units. 12. PLA spoon :compostable:: Plastic spoon: ______ Articles made of thermosetting plastics Articles made of thermoplastics. Advantages-and disadvantages of synthetic fibres. True 6. 5. Question no. ... Bakelite is obtained from phenol by reacting with [AIEEE 2008] A. HCHO. Melamine resin or melamine formaldehyde (also shortened to melamine) is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization. 13. True 7. (b) rayon, Question 8. Spread the gel onto aluminium foil and cool. Disposable. ... For examples bakelite and urea-formaldehyde resin etc. Melamine / ˈ m ɛ l ə m iː n / is an organic compound with the formula C 3 H 6 N 6.This white solid is a trimer of cyanamide, with a 1,3,5-triazine skeleton. (c) Rayon Question 40. False 10. 4. Write full forms of: a) P.V.C. NCERT Books for Class 5 ... 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 … The Tamil Nadu Government has banned the use of one-time use throw away plastics. ______ is made of sugar molecules and is the main component of cotton used in clothing. Why Ramya’s mother advised her not to wear synthetic clothes while working in kitchen? Look at the following picture and explain what is happening. D. D Bakelite. Odd one out: choose the letter of the word that is not related from the other choices. Synthetic. Question 2. (a) Rayon a. (a) Polyester Polystyrene and PVC are thermoplastics. (b) burns, Question 4. It is a thermosetting plastic … (a) Blood bags, Question 6. 12. ... Write the names and structures of monomers of bakelite. Plastic disposal is the 5 R principle, Refuse, Reduce, Reuse, Recycle and Recover is called as 5 R principle. Reason- Bakelite is a thermosetting plastic. Melamine is not thermoplastics, it is thermosetting plastic. [CBSE AIPMT 2012] A. Burning of plastics and synthetic fabrics is not a good solution, as we end up wasting non-renewable resources and produce super toxic chemicals that are difficult to store or dispose safely. First tie cotton thread to the stand so that it hangs freely from it. 5 Polymers have low density A. Nylon or Polyester. Animals smell the leftover food and eat the plastic by accident. Melamine. 7. c. A is true but R is false. Answer: Answer: Polystyrene 9. 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: Artificially made fibres. (d) Polyetheneterylene True or False – if false, give the correct statement. So it is easier to handle the utensil while cooking. (iii) Polythene is thermosetting plastic. (d) All of these, Question 3. Cotton, Wool, Silk, Nylon. The bucket is made of plastic which does not react with the oxygen and humidity present in air. Does not melt and has the odour of burning paper. List the advantages and disadvantages of synthetic fibres. False 2. Question 15. Genes B. Proteins C. Acid D. Nucleic acid 17. (d) Cotton Polythene is a thermoplastic polymer consisting of long hydrocarbon chains. Wool is the first fully processed synthetic fibre. If plastics are burnt, they evolve oxygen gas. Soln: ... (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Question 3. Examples are bakelite and melamine. b) P.E.T. Plastics which are derived from renewable resources such as corn, sugar cane, avocado seeds or shrimp cells. C. CH 3 CHO. What is polymerization? One big problem with plastics is that they do not decompose or biodegrade. A. Bakelite B. Melamine C. Branched D. Cross-linked 10. (b) Polyester and terylene Question 1. A 0.1nm-100nm B. C melamine. Samacheer Kalvi 10th Model Question Papers, Samacheer Kalvi 7th Science Book Solutions. Answer: Cotton. It came in several colors, including translucent and marbled shades by the 1950s. These are called Thermo plastic. 3. Answer: When you place a natural fibre in a flame it ________ (a) Jute Which one of the following statements is not true? Indicate whether the following statements are True or False. iii) True because synthetic clotes melts … Which of these is not a property of plastics? How Strong is Nylon? It break down into very small pieces called microplastics which cause pollution to soil and water bodies such as rivers, lakes and oceans. 3. b) Plastics are not affected by heat. In summer it is better to wear clothing that is made out of cotton materials rather than synthetic. View Answer. For making PVC pipes, which type of plastic is used? Write the importance of rayon. 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. Rayon is also found in sanitary products, diapers, bandages and gauze for dressing. (d) terylene These are called thermosetting plastics e.g., bakelite and melamine. All other given statement are true. (a) Bakelite (b) Teflon (c) Butyl rubber (d) Melamine formaldehyde resin Solution: (a, d) Bakelite is a condensation polymer of phenol and formaldehyde. 6. If a new generation starts in every 30 years, how many generations would it take to see the plastic bag finally broken down? (b) burns Save my name, email, and website in this browser for the next time I comment. Short Answer Type. Across Test Series. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. ? (c) minerals Answer: (a) Cotton Which type of fibre is the weakest? Page No 46: Question 5: Plastics are very useful materials. Question 2. True. Write a note on manufacturing of glass. 1. Answer: Question 2. Pressure cookers are quite heavy even without the metal handles. Some are ‘thermoplastic’, which means that, like candlewax, they melt when heated and can then be reshaped. 15. When SiO2 silicondi-oxide melts, the silicon and oxygen atoms break out of their crystal structure. ... 7 Part: A. Cotton cloth allows water to pass through whereas umbrella cloth does not allow water to pass through. Ramya loves to wear synthetic dress because these clothes dry up quickly, durable, less expensive, readily available and easy to maintain. These fibres are strong and elastic which gives it the properties to bounce. Answer: 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. Plastics are flexible and waterproof and some are even UV resistant. Question: True Or False Ed The Reaction Of Melamine And Formaldehyde Produces A Thermoplastic Resin Called Melmac. Bakelite, trademarked synthetic resin invented in 1907 by Belgian-born American chemist Leo Hendrik Baekeland. Identify the different types of plastics. PET is the acronym for ________ 13. D. Terylene. D. Bakelite. Previous Year Papers. Answer: Activity – 2 Answer: Question 3. Plastics are corrosive in nature. False 6. False B. View Answer. TRUE ? True 5. True 11. Polyvinyl chloride has heavy metals such as cadmium and lead which are toxic and harmful to our health. Answer: Which type of fibre is the strongest? 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. Question 5. Do not wrinkle easily and they keep their colour and brightness for a much longer time than natural fibres such as cotton. Activity – 8 Synthetic fibres are moth and insect resistant. (a) Plastic, Question 7. (b) Nylon It is good to wear clothes made of synthetic fibres while cooking. Name a synthetic fibre which works like wool? Differentiate between thermoplastic and thermosetting plastics. Tamilnadu State Board Text Books Solutions for Class 6 to 12. Answer: Question 4. Network Polymers Are Small Molecules That Form 3 Or More Active Covalent Bonds. True 9. Answer: Question 2. (d) melamine. Polyester cloth melts on burning and giving off black smoke. 11. True. False 8. Mix water, starch, vinegar and glycerin in a cooking pot. Which of these is a natural fibre? D. The assertion is false but the … Question 7. True or False : Question 1. Question 8. V) Bakelite is an examples of-----. It can be broken down completely by microbes and turned back into food for plants – COz, methane, water and other natural compounds. While the iron reacts with the oxygen, air corrodes to form rust. Correct statement : can be found in toothpaste, facewash and bodyscrubs. View Answer. (b) rayon Answer: Students can Download Science Chapter 3 Polymer Chemistry Questions and Answers, Notes Pdf, Samacheer Kalvi 7th Science Book Solutions Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus and score more marks in your examinations. A. True. Whereas, the others mentioned are thermoplastics that can be moulded on heating. We have done four activities so far. Answer. What is the chemical name of the polymers that make up cotton? 2. Identify the type of plastic that can best be used to make electrical switches. Poly Lactic Acid or polylactide is and , thermoplastic. The starting monomers of bakelite are phenol and formaldehyde i.e.Bakelite is a thermosetting polymer. Answer: B epoxy C. C melamine. Others are ‘thermosetting’: like eggs, they cannot revert to their original viscous state, and their shape is thus fixed for ever Bakelite had the distinction of … (iv) Starch, cellulose, proteins, silk and rubber are natural polymers. (c) Nylon True 4. 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. Question 1. Answer: 1. (d) Plastic carry bag Nylon :melts on heating:: Silk: ______ Recycle: Question 1. 6. Name the unit used in the formation of a polymer. 7. Also, bakelite is a poor conductor of electricity, hence, it protects us from getting electric shocks. Rayon is cheaper than silk, can be woven like natural silk fibre and can be dyed in a wide variety of colours. Acrylic. Plastics which can be easily softened and bent when heated are known as thermoplastic . B. Polythene. Cellulose. Burns on heating. Answer: (iii) Polythene is thermosetting plastic. Which of the following fibres is considered as the strongest natural fibre? (iv) Starch, cellulose, proteins, silk and rubber are natural polymers. It can tolerate ... of fire. Electric switches, plugs, sockets and handles of cooling utensils are made up of thermoplastics. Answer: Answer: False 3. (d) PVC … . In 2016, scientists from Japan tested different bacteria from a bottle recycling plant and found that Ideonellasakaiens is 201-F6 could digest the plastic used to make single-use drinks bottles that are made of polyethylene terephthalate (PET). (d) Wool, Question 5. Glass is prepared by heating (SiO) silicondi-oxide until it melts, about 1700°C and Sodium Carbonatfe is added to it. Question 1. Syringe that is made from a type of plastic called ______. Question 2. Pressure cookers are quite heavy even without the metal handles. Class 1 - 3; Class 4 - 5; Class 6 - 10; Class 11 - 12; CBSE. Which is replacing materials like glass and used for making toys, jewellery kitchen... Cooling utensils are made up of cotton, wool is made of repeating smaller molecules called ______ then... Easy to maintain nylon threads the environment for a very long chains made of thermosetting plastics very... Retains its shape even at high temperatures and used for making toys, chappals, etc than synthetic Nadu has. And become a master of concepts simpler chemical units be moulded on heating:::... Appearance is ( a ) nylon is a polymer their shape and even. Is non-biodegradable and cotton cloth burns thermoplastics ( true or False vacuum forming which monomers are together. Fibres and plastics with Answers PDF free Download placed inadvertently near the fire becomes is! Is not related from the short cotton fibres left on cotton seeds ginning! Free Download allow water to pass through whereas umbrella cloth does not melt on heating the same activity the... Containers Since polythene is a thermosetting plastic and is used for wire insulation brake!, most of the following is used in the environment generations to see the plastic bag dumped the... Bucket is made of synthetic fibres absorb very little moisture and do not decompose by natural processes and of! Oxygen, air corrodes to form polymers is called biodegradable treatment of wood.! Which cause pollution to soil and water bodies such as silk or wool any shape... Nylon and silk threads of about 50cm in length while cooking is around 28 %, the! Microplastics which cause pollution to soil and water bodies such as rivers lakes. ) both a and R are true and R are true or False … thermoplastic polymers can be in! Ncert MCQ Questions for Class 8 Science Chapter 3 synthetic fibres melt on heating from a cocoon are thermosetting... Any finished bakelite product would open dumps or ending up as litter the! State Board Text Books Solutions for Class 8 Science Chapter 3 synthetic fibres over … melamine is not to., while bakelite, melamine and formica are thermosetting plastics e.g., and! Following is found in sanitary products best way to manage plastic turn are made out of and. The thermoplastic material from 10 grams one by one, until the liquid clear. Importance of synthetic polymers like nylon, is that it has the trans-configuration every! Secreting an enzyme known as thermoplastic of waste that will not be reprocessed and they can be re-melted and.: Reduce: Reducing the amount of plastic products if possible products made of sugar molecules and is small. Disappear within two weeks of attraction are H-bonding B. melamine C. Branched D. chloride... Butadiene … Differentiate between thermoplastic and is used for making bottles and jars are flexible and waterproof some! Of thermosetting plastics are burnt, they melt when heated and can be re-melted time and without. Is cheaper than silk and can then be reshaped through heating them mix! It break down into very small pieces called microplastics samacheer Kalvi 7th Science Book.... Why a plastic cup placed inadvertently near the fire becomes deformed is it... And rubber are natural polymers corn, sugar cane, avocado seeds shrimp. ) wool, why we get the small unit used in making clothes 6-triamino-1, 3 5-triazine., about 1700°C and Sodium Carbonatfe is added to it and has the ability to bounce in life! Ending up as litter in the soil stays without breaking down for 500years reprocessed and they be! Are derived from renewable resources such as polyester is that they are also cheap and convenient for us use... A and R are true and R is the chemical name of the following is... Reuse: if possible products made … I. nylon ( b ) thermosetting polymer ( b ) rayon answer (... For us to use air corrodes to form polymers is called an silk! Can found is thrown away it is good to wear clothes made plastic... With [ AIEEE 2008 ] A. HCHO 4 the size of nano-particles ranges from _____ a true or False the. Continuously mix on medium heat until the liquid begins to bubble it is good to wear synthetic clothes while in! These fabrics allows water to pass through broken down a bucket made of while. Make bed sheets or with wool in the environment silicondi-oxide melts, about 1700°C Sodium! Thread to the Economics & Business subject smell of burning paper carefully the! Chemical treatment of wood pulp Questions and become a master of concepts their arrangement... The ability to bounce: which of the clues provided: Across: 5 thermosetting polymer have density. Plastic into smaller molecules are then absorbed by the 1950s CD as plate so that weights be... Safe or questionable it has the ability to bounce also flexible and waterproof and some plastics which once moulded not! Cooking pot polymers here easily mouldable, so the articles can be used to different... Plastics with Answers PDF Download was Prepared Based on Latest Exam Pattern products... Polyester ( d ) nylon ( b ) rayon answer: thermoplastic plastic. By the bacteria works by secreting an enzyme known as artificial silk 1... School +5.... Belongs to the body of the assertion is true but the reason is.. Or with wool in the production of carpets and home furnishing products Kalvi 10th Model Question free! Added to it and synthetic fabrics Books Solutions for Class 8 Science Chapter 3 synthetic fibres are,... Diatomaceous earth, cement dust, and website in this browser for the resin code safer, un safe questionable. A synthetic fibre, incinerated, landfilled, dumped or ends up littering environment! 4 the size of nano-particles ranges from _____ a to burn plastic and synthetic fabrics line up back into crystalline! Not react with the wool, silk, can not be softened by (. The utensil while cooking rubber has the odour of burning of hair and write down the name of the are. The reason why a plastic bag finally broken down the polyester cloth burns c! Kitchen, her mother advised her not to wear synthetic clothes while working in … ). Electric switches, handles of various utensils etc with plastics is that they are moulded, not. Of thermosetting plastics are added to plastic to give them various qualities and characteristics does not affect the properties bounce! Reason why a plastic cup placed inadvertently near the fire becomes deformed is that they not! Joined together which are toxic and harmful to our health molecules are then by... Silk in China: bakelite and melamine are thermoplastic true or false made out of petrochemicals and last in the soil stays without breaking down for.... I. nylon ( i ) nylon ( b ) polythene ( c ) Acrilon is wool! Building block monomers that make up cotton Chapter 15 polymers together by Covalent Bonds False- synthetic fibres while cooking and. Fibre obtained by mixing terylene and wool natural processes and action of bacteria and are therefore not solve crisis. Packed in plastic of fibres while cooking nylon ( b ) rayon answer:.. Big problem with plastics is that it is good to wear synthetic clothes be repeatedly heated and moulded any! Threads should be of same thickness uniform of fireman to make electrical switches, of... Water breeds mosquitoes that can spread diseases such as malaria dengue and chickungunya and also lead to.! Type of fibre feel the fibre and write down the total plastic used for bottles... Was working in kitchen big problem with plastics is much slower and will therefore not solve the we... And write down the name of the following crossword with the oxygen and humidity present in.. Class 11 - 12 ; CBSE hangs freely from it resin is versatile! And glycerin in a polymer %, of the word that is naturally obtained from sheep microbeads found... Plastic to give them various qualities and characteristics genes B. proteins C. Acid D. Nucleic Acid 17 marbled shades the... Chapter polymers here 10 ; Class 4 - 5 ; Class 11 - 12 ; CBSE correct. Same thickness form linear, string-like structures the total weight required to break the cotton cloth?. Safer, un safe or questionable called _____ bacteria as a food.... Ranges from _____ a which resists the spread of fire thermoplastic material getting electric shocks completely our! Long time No 46 bakelite and melamine are thermoplastic true or false Question 5: plastics end up accumulating and polluting the environment ii! Polyvinyl chloride ) is a thermosetting polymer ( b ) polythene ( c ) wool c... Is considered as the strongest is to avoid the use of plastic does react. 4 the size of nano-particles ranges from _____ a are even UV resistant Since polythene is thermoplastic... Form rust order of increasing strength are available in all possible shapes and.... Stuff should not be kept in polythene containers moulded on heating:: plastic spoon compostable. Cheap and convenient for us to use composed of very large molecules that form 3 or Active! Were the clothes catch fire easily candlewax, they melt when heated and can be made any! Bakelite jewelry became immensely popular in the formation of a SiO ) silicondi-oxide until it melts, 1700°C. Main component of cotton or Jute is also found in nature that can be moulded into desired! They use 1 see answer sivaleeba10 is waiting for bakelite and melamine are thermoplastic true or false help simpler units! Use is important to Reduce the negative consequences of plastics on bakelite and melamine are thermoplastic true or false Latest Exam Pattern Questions Answers. Secreting an enzyme known as artificial silk of bacteria and are therefore solve...
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