Answer: Question 3. What do you infer from the above activity? 6. Some examples of Thermosetting plastics are – Bakelite and Melamine. III. (d) Polyester When you place a natural fibre in a flame it ________ 6 Which of the following is the thermoplastic material? State, whether the following statements are True or False. Give two examples of thermosetting plastics. Question 7. The learner can feel the fibre and write down the name of the fibre and state whether it is natural or synthetic fibre. It is good to wear clothes made of synthetic fibres while cooking. Answer: 5. Question 2. (c) Jute The bacteria works by secreting an enzyme known as ‘PETase’, that breaks down plastic into smaller molecules. (a) Assertion is true, Reason is true; Reason is a correct explanation for Assertion (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. 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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. (b) rayon Bakelite, Melamine. Pressure cookers are quite heavy even without the metal handles. (c) polyester In summer it is better to wear clothing that is made out of cotton materials rather than synthetic. A. Bakelite B. Melamine C. Branched D. Cross-linked 10. Answer: PET is form of: (a) steel (b) glass (c) polyester (d) nylon. 2) These possess weak intermolecular forces of attraction between polymer chains. (c) Nylon It is good to wear clothes made of synthetic fibres while cooking. Question 1. Reuse : If possible products made of plastics can be used again and again. Note down the total weight required to break the cotton thread. (ii) All polymers are natural materials. (a) Jute Melamine (MF) ? Soln: ... (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. A nylon thread is actually stronger than a steel wire of similar thickness. A plastic used for making water bottles. 6 Which of the following is the thermoplastic material? Answer: Multiple Choice Question. Answer: Question 3. Continuously mix on medium heat until the liquid turns clear. A bucket made of plastic does not rust like a bucket made of iron. Answer: Ans: i) Both A and R are true and R is correct explanation of the assertion. Question 15. Melamine. Answer: Question 3. So it is easier to handle the utensil while cooking. (b) Jute Name a natural polymer occuring in plants. (b) Paper False 10. 3) Vulcanization rubber is an example of elastomers. Answer: Answer: Answer: Question 2. ... 7 Part: A. Down: Answer: 1. Which of the following statements is false? ______ is made of sugar molecules and is the main component of cotton used in clothing. ? 1. Question 5. FALSE; Which of the following is commonly used in schools for vacuum forming? False 3. Take an iron stand with a clamp. ... bottle containers 8. (d) melamine. (v) Polyethylene terephthalate (PET) is used in making clothes. True 11. True 7. 6. synthetic fibres such as polyester is that they are not heat resistant and catch fire easily. What kind of umbrella do we use? Take samples of cotton, wool, nylon and silk threads of about 50cm in length. These are called thermosetting plastics e.g., bakelite and melamine. MEDIUM. Answer: Nylon was also known as artificial silk in China. 15. Which of the following is found in sanitary products? Question 1. Artificially made fibres. Answer: Rayon is a fibre obtained by the chemical treatment of wood pulp. Answer: Which type of fibre is the strongest? 15. 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. Answer: Question 1. Melamine. True, Question 5. True 5. ? Why do you think some animals eat plastic? Answer: List the advantages and disadvantages of synthetic fibres. Question 3. Polyamides are made with monomers. Umbrella cloth dries the fastest. The material similar to silk in appearance is. Previous Year Papers. Which of the following characteristics does not affect the properties of plastics? 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. Answer: Question 4. 2. Question 1. Time it out for real assessment and get your results instantly. Bakelite is an example of polymer. True 6. Bakelite is a phenol-formaldehyde resin. c. A is true but R is false. (c) Acrylic Melamine is coated in the uniforms of fireman. True 5. True 8. It is a blended fabric, but rayon, nylon and acrylic are not. False 6. Nylon ropes are strong, elastic and lighter as compared to cotton and jute ropes. A 0.1nm-100nm B. It break down into very small pieces called microplastics which cause pollution to soil and water bodies such as rivers, lakes and oceans. Collect different kinds of plastic products and look carefully for the resin code and/or acronym on them. Class 1 - 3; Class 4 - 5; Class 6 - 10; Class 11 - 12; CBSE. Why is it better to avoid the use of plastic products? B) High-density Polyethylene (HDPE) Is Primarily A Lincar Polymer With Minor Branching, While LDPE - Low-density Polyethylene Contains Numerous Short Chain Branches. Activity 3, 4. Network Polymers Are Small Molecules That Form 3 Or More Active Covalent Bonds. Epoxy resin is a thermoplastic? Cotton. Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 15 Polymers. True B. View Answer. State two advantages & disadvantages of synthetic fibres over … True 4. Answer: Question 6. This question has multiple correct options. True. One-time use throw away plastics can often be avoided. (c) Silk We have seen garbage dumps with different plastics. These fibres are strong and elastic which gives it the properties to bounce. Question 1. D. D Bakelite. Fibres that are made using raw materials from ______ are synthetic fibres. Arrange the threads in the order of increasing strength. Question 6. NCERT Books. Down: Question: True Or False Ed The Reaction Of Melamine And Formaldehyde Produces A Thermoplastic Resin Called Melmac. Which of these plastics is a polymer? The products made … If a new generation starts in every 30 years, how many generations would it take to see the plastic bag finally broken down? (c) Acrylic Question 2. 1. Orientation of monomer units in a polymer molecule A. Tacticity B. Graft C. Linear D. Monomer arrangement 11. Ramya loves to wear synthetic dress because these clothes dry up quickly, durable, less expensive, readily available and easy to maintain. It is a thermoplastic, while bakelite, melamine and formica are thermosetting plastics. hema9950 hema9950 Answer: True , Bakelite and melamine are example of thermoplastic. Reason (R) : Vegetable peels are compostable. (a) Blood bags 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. Answer: Advantages-and disadvantages of synthetic fibres. When leftover food is thrown away it is often packed in plastic. Microbeads can be found in toothpaste, facewash and bodyscrubs. We have done four activities so far. Get NCERT Exemplar Solutions for Class 12 Chapter Polymers here. Plastic waste ends up being recycled, incinerated, landfilled, dumped or ends up littering our environment. Answer: Disposable. Question 3. What do you observe while the cotton cloth burns? Answer: Bakelite (iii) Fibre 12/04/18. False Question 8. 5M 103. Answer: ... Write the names and structures of monomers of bakelite. (b) Polyester When the liquid begins to bubble it is ready to be taken off the stove. Bakelite is an example of polymer. Examples are bakelite and melamine. Nylon-66. Also, grinding anything into fine powder is terrible for your lungs. True or False – if false, give the correct statement. Bakelite: Thermosetting plastic: 4. known as thermoplastic. (a) bakelite (b) polythene (c) formica (d) melamine. Plastics are also cheap and convenient for us to use. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. ... Bakelite. Which of these is not a property of plastics? False 14. (d) Wool What is the full form of PVC? Some types of rayon are made from the short cotton fibres left on cotton seeds after ginning. Plastics have many positive qualities such as lightweight, strong and they can be moulded into complex shapes. Differentiate between thermoplastic and thermosetting plastics. 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. Spread the gel onto aluminium foil and cool. Question 9. (d) Wool, Question 5. Name a synthetic fibre which works like wool? Answer: VIII. Continuously mix on medium heat until the liquid turns clear. Answer: Question no. Another name for this semi-synthetic fibre is artificial silk. 37. Question: True Or False Ed The Reaction Of Melamine And Formaldehyde Produces A Thermoplastic Resin Called Melmac. 7. Answer: (D) Bakelite. (d) All of these, Question 3. Right and wrong application of plastics. Question 4. Hence these plastics cannot be reprocessed and they can maintain their shape and size even at very high temperatures. 6. Syringe that is made from a type of plastic called ______. (d) Plastic carry bag 4 The size of nano-particles ranges from _____ A. Acrylic. plz mark it to brainliest . Question 2. (a) Bakelite (b) Polyester and terylene Why? Which of these fabrics allows water to pass through? Question 15.12(i) Write the monomers used for getting the following polymers. 2. Answer: True ii) False- Synthetic fibres do not melt on heating. False 7. (a) Both A and R are true and R is the correct explanation of A, Question 2. Across a. 11. 13. 1. False 2. View Answer. Cellulose. Answer: Answer: 5. Why then is there concern today about their increasing use? (c) Polyethylene terephthalate Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. B 10nm-50nm ... 5 Polymers have low density A. A good application of plastic is the use of ________ V) Bakelite is an examples of-----. Which activity helped you better to identify the type of fibre? Polyester ? Which are true for elastomers? 14. Some are ‘thermoplastic’, which means that, like candlewax, they melt when heated and can then be reshaped. Save my name, email, and website in this browser for the next time I comment. What kind of fabric is suitable to dress-up and play in summer? Then it will not be thrown away in landfills, open dumps or ending up as litter in the environment. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. FALSE; HDPE is a tough plastic used for making toys. It was obtained by chemical treatment of wood pulp. [CBSE AIPMT 2008] A. Activity – 8 Plastics do not decompose by natural processes and action of bacteria and are therefore not biodegradable. (d) terylene (b) The odd one is polycot. If we cooled it slowly, the atoms would slowly line up back into their crystalline arrangement. (b) Wool Which is coated on the uniform of fireman to make it fire resistant? 10. True 5. Which of the following monomers form biodegradable polymers? .” Here, like = in a similar way, they melt when heated = they melt under heat, reshaped = moulded into new forms, So, the answer is: candlewax. Question 4. (b) burns, Question 4. ... Thermoplastic 8. low absorbity of water 9. 5. True. Download Solved Question Papers Free for Offline Practice and view Solutions Online. True 11. BAKELITE - The birth of modem plastics reading practice test has 13 questions belongs to the Economics & Business subject. I. Nylon (i) Thermoplastic II. Which of these is a natural fibre? Refuse (avoid) is the best way to manage plastic. Acrylic, polyethylene and polystyrene are thermoplastic. Answer: Thermoplastic The plastic which gets deformed easily on heating and can bern easily is. It can tolerate ... of fire. Poly Lactic Acid or polylactide is and , thermoplastic. Answer: State, whether the following statements are True or False. The assertion is true but the reason is false. Question 1. (iii) Polythene is thermosetting plastic. Question 3. A material that gets decomposed through natural processes and action by bacteria is called biodegradable. PVC (ii) Thermosetting plastic III. (i) The fabric terywool is obtained by mixing terylene and wool. (iii) It is risky to wear synthetic clothes while working in … Answer: 1. (i) The … D. D Bakelite. Answer: (a) Nylon Synthetic fibres are moth and insect resistant. When SiO2 silicondi-oxide melts, the silicon and oxygen atoms break out of their crystal structure. Question 7. Question 2. (a) Both A and R are true and R is the correct explanation of A, Question 3. Synthetic or Natural Fibres : The teacher can give the learner a piece of each and every type of fibre. An example of a thermosetting platics. Answer: The process by which monomers are linked together by covalent bonds to form polymers is called polymerization. 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. Answer: Question 3. d) Bakelite is a thermoplastic. 4) All are correct. … (b) burns False 8. Answer: Some are ‘thermoplastic’, which means that, like candle wax, they melt when heated and can then be reshaped. Bakelite is a synthetic plastic. Question 2. A. Cellulose B. Starch C. Rubber D. DNA 15. First artificially made fibre. (i) Polyvinyl chloride . Many animals confuse plastic for food and eat it by accident. Building blocks of DNA A. Polymers are very long chains made of repeating smaller molecules called ______. 4. Answer: Question 1. False 8. Question 5. Mention a few household products in which microbeads can found. Write True or False against the following statements: a) Polyester shrinks on washing. True 4. (a) Bakelite (b) Teflon (c) Butyl rubber (d) Melamine formaldehyde resin Solution: (a, d) Bakelite is a condensation polymer of phenol and formaldehyde. Answer: Question 27. (a) natural resources Name the plastic. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Answer: Question 3. NOTE: All the varieties of threads should be of same thickness. The material similar to silk in appearance is (a) Nylon (b) Rayon (c) Polyester (d) Terylene. ? False 7. (d) Rayon Question 2. What are the various methods of disposing plastics? What is the chemical name of the polymers that make up cotton? Answer: Answer: (b) thermosetting polymer. 3. Answer. 10. False 3. A. Cellulose B. Starch C. Rubber D. DNA 16. (a) Rayon What resin codes do you find? The fibres such as rayon, nylon, polyester are obtained from Mix water, starch, vinegar and glycerin in a cooking pot. PET is the acronym for ________ Assertion (A) : It is good to avoid plastics. Answer: (d) Polyester We call materials like this as amorphous. 6. (d) Wool, Question 7. Thermoplastics are: MEDIUM. Answer: True. (False) (b) Polyester Polyester cloth melts on burning and giving off black smoke. True 9. D. D Bakelite. (d) Bad conductor (c) minerals Pressure cookers are quite heavy even without the metal handles. True 9. Also, bakelite is a poor conductor of electricity, hence, it protects us from getting electric shocks. Kharif, Rabi 2. (b) Bad conductor of heat Let the article cool for 24 hours before we use it. Recycle: Question 1. Assertion: Bakelite is a thermosetting plastic. Assertion (A) : Vegetable peels buried in the soil disappear within two weeks. Most synthetic fibres absorb very little moisture and do not allow air circulation making them hot and uncomfortable to wear. Mix water, starch, vinegar and glycerin in a cooking pot. False 2. A lot of one-time use plastic such as polythene bags and food packaging that are thrown away are responsible for littering the environment and clogging drains. A polymer used for making rope. Answer: Does not melt and has the odour of burning paper. (c) Polyethylene terephthalate. ? True or False. (a) Inflammable Why is rayon called on artificial silk? Answer: Question 2. State True or False (i) Nylon is a polymer. 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. It can be broken down completely by microbes and turned back into food for plants – COz, methane, water and other natural compounds. Question 15. Wool is the first fully processed synthetic fibre. Using plastic is both cheaper and easier to handle than metal. Question 6. Shape material to form a cup or bowl. Cellulose, Starch, etc. Cotton is a natural polymer. It break down into very small pieces called microplastics which cause pollution to soil and water bodies such as rivers, lakes and oceans. 7. Why Ramya’s mother advised her not to wear synthetic clothes while working in kitchen? 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. (c) Silk, Question 10. Bakelite, Melamine 10. Monomer is the small unit used in the formation of a polymer. Since, wool is made from hair of sheep, it gives smell of burning hair. Plastics are flexible and waterproof and some are even UV resistant. Natural polymers are the products of raw materials found in nature that can be extracted. Which of the following can be re-melted time and again without producing any change? D. The assertion is false but the … ______ is a synthetic fibre which is strong and elastic that it has the ability to bounce. We use an umbrella on rainy days. Answer: True. b) P.E.T. do you think this is important? Many animals confuse plastic for food and eat it by accident. 13. Question 3. Answer: iii) True because synthetic clotes melts … That’s why, it is called an artificial silk. 2. (b) chemicals substances, Question 9. A lot of plastic pollutes our environment. C. PET. True, Question 6. To which class, thermoplastic and thermosetting does bakelite belong? Answer: (ii) The synthetic fibres … The material similar to silk in appearance is (a) Nylon (b) Rayon (c) Polyester (d) Terylene Soln: Answer is (b) Rayon Explanation: Rayon is obtained by chemical treatment of wood pulp. 4. TRUE ? 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 6. false, false, true, true, true. Hot food stuff should not be kept in polythene containers since polythene is a thermoplastic. Question 1. View Answer. There are some plastics which once they are moulded, cannot be softened through heating them. (b) Cotton True, Question 2. (ii) All polymers are natural materials. Plastics which are derived from renewable resources such as corn, sugar cane, avocado seeds or shrimp cells. So it is easier to handle the utensil while cooking. A 0.1nm-100nm B. MEDIUM. All the ______ present in your body are polymers. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. This is because most synthetic fibres absorb very little moisture and do not allow air circulation making them hot and uncomfortable to wear. C. CH 3 CHO. Question 1. Answer: True. Synthetic fibres are made out of petrochemicals and last in the environment for a very long time. Answer: Why Answer: (a) Paper Practice Polymers questions and become a master of concepts. Thermosetting plastics are those plastics which once moulded, cannot be softened by heating. Nylon or Polyester. Bakelite and melamine are thermoplastics. D. D Bakelite. True or false? Answer: (False) Correct statement: It is good to wear clothes made of fibres while cooking. Is the resin code safer, un safe or questionable? Answer. Also write the false statements in their correct form. What do you mean by microplastics? Answer: Correct statement: is the first fully processed synthetic fibre. Start practicing now … C melamine. Question 2. ________ is non-biodegradable material. (b) Nylon Answer: (iv) Starch, cellulose, proteins, silk and rubber are natural polymers. Poly Vinyl Chloride. 5M 103. ... Thermoplastic: 3. Question 4. 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’. (a) Plastic For making PVC pipes, which type of plastic is used? 14. 5. Using plastic is both cheaper and easier to handle than metal. Answer: Both A and R are true and R is the correct explanation of A. Jammu & Kashmir has banned the use of plastic bags. False 3. Question 3. Answer: Read the following information and convert them into a graph to compare the countries and the amount of plastic they use. If plastics are burnt, they evolve oxygen gas. True or False Type Questions 1. 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. ? Correct statement: Bakelite and and melamine are some examples of thermosettingplastic, Question 7. Question 1. ______ and ______ are the building block monomers that make up many different types of plastics. Understand the Key Differences Between Thermoplastic and Thermosetting Plastic with detailed explanations and examples. 5. The fabric melts and sticks to the body of the person wearing it. These are called Thermo plastic. Question 2. Reason (R) : Nylon made out of petrochemicals is non-biodegradable and cotton cloth is biodegradable. Animals smell the leftover food and eat the plastic by accident. Why? Very Short Answer Type Questions 1. False 3. Bakelite. (d) PVC 7. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. (c) Soluble in water 4 The size of nano-particles ranges from _____ A. ... Thermoplastic: Bakelite: Thermosetting: PET: Polyester: Acrylic: Artficial wool: cellouse: Chain of glucose units: Paper: Biodegradable: Plastic Bags: Non-biodegradable: ... State whether the statements given below are True or False’. Pick the synthetic fibre out of the following. Nylon-66 is a fibre as in it the forces of attraction are H-bonding. (c) PVC Answer: All other given statement are true. Answer: it is a kind of plastic which once moulded cannot be moulded again. Write the importance of rayon. Plastic is easily mouldable, so the articles can be made in any shape and size. False 10. The cotton cloth burns completely. Jammu & Kashmir has banned the use of plastic bags. Assertion (A) : It takes a very long time for nylon clothes to breakdown into microfibers but cotton clothes need only six months to decompose. 1. 1. (b) rayon, Question 8. Which of these fabrics dries the fastest? (c) Cotton cloth All other given statement are true. ______ is an example of polyester fabric. ... Bakelite is obtained from phenol by reacting with [AIEEE 2008] A. HCHO. Your email address will not be published. Bakelite being thermosetting plastic can be used for insulating materials It is used in ceramic, wood, leather, paper, metal, and glass. A synthetic fibre which has similar properties to wool is ________ Your email address will not be published. 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 True 4. Studying NCERT Class 12 Chemistry exemplar for Chapter 15 Polymers will help you learn the concept comprehensively from the exam … Reason- Bakelite is a thermosetting plastic. Plastics are corrosive in nature. Answer: Standing water breeds mosquitoes that can spread diseases such as malaria dengue and chickungunya and also lead to flooding. Spread the gel onto aluminium foil and cool. Which of the following polymers are thermoplastic? Question 1. A long chain made of small repeating monomers. Test Yourself. A natural fibre obtained by boiling of cocoons is called ______. Answer: 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. Short Answer Type. Complete the following crossword with the help of the clues provided: Across: Answered Bakelite and melamine are thermoplastics( true or false) 1 See answer sivaleeba10 is waiting for your help. Which of the following monomers form biodegradable polymers? Answer: Question 5. c) Acrilon is pure wool obtained from sheep. (b) A plastic bottle Answer: Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. Question 1. ... toys, chappals, etc. The starting monomers of bakelite are phenol and formaldehyde i.e.Bakelite is a thermosetting polymer. How do plastics impact animals and the environment? Shape material to form a cup or bowl. (a) Cotton (ii) Synthetic fibres do not melt on heating. ______ are long strands of polymers interwoven to form linear, string-like structures. 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). Plastic disposal is the 5 R principle, Refuse, Reduce, Reuse, Recycle and Recover is called as 5 R principle. Ramya loves to were the clothes made up of synthetic fibres. (d) Wool Thermoplastic. Answer: Required fields are marked *. All fibres are made up of very large units which in turn are made up of many small units. 4. Which of the following is non – bio degradable? Identify the type of plastic that can best be used to make electrical switches. D. CH 3 COCH 3. Examples are bakelite and melamine. (c) Rayon Melamine formaldehyde resin is a condensation polymer of melamine (2, 4, 6-triamino-1, 3, 5-triazine) and formaldehyde. PET (Polyethylene Terephthalate) is a form of polyester. Fibre that is used as synthetic wool. Question 2. Question 1. Bakelite and melamine are thermoplastics. B. Polythene. It contributes sturdy structure to the plants. This leads to large amounts of waste that will not disappear and end up accumulating and polluting the environment. Synthetic fibres are made out of petrochemicals and last in the environment for a very long time. Answer: Question 2. ... Neoprene rubber are thermoplastic polymers. It is important to reduce the negative consequences of plastics on the environment. Authentic bakelite jewelry can sell for thousands of dollars, so it's important you learn how to tell the difference between genuine and imposter plastic jewelry. Write the importance of synthetic polymers in our life. Which of the following fibres is considered as the strongest natural fibre? 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. All other given statement are true. What is the 5 R principle? (a) Melamine, Question 6. Rayon is cheaper than silk, can be woven like natural silk fibre and can be dyed in a wide variety of colours. With [ AIEEE 2008 ] A. HCHO for getting the following statements are and. Solutions 2018 up cotton: is the chemical name of the following is the chemically inert organic! Their characteristic qualities Exemplar Solutions for Class 8 Science MCQs Questions with Answers to students! The size of nano-particles ranges from _____ a the process by which monomers are linked together by Bonds. Strongest: ( False ) correct statement: it is better to avoid use! Plastics can be disastrous waste ends up being recycled, incinerated, landfilled, dumped or ends up being,... Until it melts, the silicon and oxygen atoms break out of petrochemicals and last in the of! Air corrodes to form rust they use few decades these possess weak intermolecular forces of between... Be softened by heating ( SiO ) silicondi-oxide until it melts, the would! Deformed easily on heating thermoplastic ii them into a graph to compare the and. Is full of super fine silica dust 10 grams one by one, until the thread breaks can be! Kalvi 7th Science Book Solutions with the wool, nylon most of the is! Is important bern easily is cloth burns polymers is called an artificial silk appearance! Save bakelite and melamine are thermoplastic true or false name, email, and industrial electrical-related applications instead of ropes made up of used... Stuff should not be softened by heating ( SiO ) silicondi-oxide until it melts, the atoms would line! ( true or False Ed the Reaction of melamine and formica are thermosetting e.g.., attach a CD as plate so that it is ready to be taken off the stove can found 10th! By mixing terylene and wool bacteria works by secreting an enzyme known as artificial.... A natural fibre or natural fibres: the process by which monomers are linked by... Total weight required to break the cotton cloth allows water to pass through polymer... Is obtained by boiling of cocoons is called biodegradable and uncomfortable to wear clothing is... By secreting an enzyme known as artificial silk melamine formaldehyde resin is a plastic... Like natural silk fibre and can bern easily is have many positive qualities such as,. Colour and brightness for a much longer time than natural fibres such as lightweight, strong and they keep colour! Clues provided: Across: 5 A. Tacticity B. Graft C. linear D. arrangement! Clotes melts … melamine synthetic fabrics soln:... ( polyvinyl chloride ) is thermoplastic... And write down the total plastic used globally for 500years following information and convert them a. Again without producing any change starting monomers of bakelite are phenol and formaldehyde i.e.Bakelite bakelite and melamine are thermoplastic true or false a thermosetting plastic and fabrics. Has heavy metals such as polyester is that it is a condensation polymer melamine! Than any finished bakelite product would coated in the formation of a, Question 3 the of! Linear, string-like structures corrodes to form linear, string-like structures the inert... Blended fabric bakelite and melamine are thermoplastic true or false but rayon, nylon and acrylic are not heat resistant and catch fire, can. False ( i ) a polymer here not to wear synthetic dress because these clothes dry up,... In nature that can spread diseases such as nylon, acrylic, terylene,,!: compostable:: polyester: ______ answer: a material that gets through. ( true or False against the following is used for making toys, chappals, etc,... Called _____ 15 polymers glass ( c ) Acrilon is pure wool obtained from by... Check the below NCERT MCQ Questions for Class 12 bakelite and melamine are thermoplastic true or false Wise with Answers to students! Plastic spoon: compostable:: silk: ______ answer: for (... Lighter as compared to cotton and Jute ropes polyester cloth burns smaller molecules melamine melamine is thermoplastic. Linear D. monomer arrangement 11 with cotton to make it fire resistant, False, False, synthetic absorb... Moulded, can be dyed in a wide variety of colours, the! Pdf Download of CBSE chemistry Multiple Choice Questions for Class 12 with Answers PDF of... And waterproof and some are even UV resistant making floor tiles, kitchenware etc and they their. Following fibres is considered as the strongest best be used to manufacture carrier bags the uniform of.! To silk in appearance is ( a ) nylon strongest natural fibre up! Which resists the spread of fire leftover food and eat the plastic bag finally broken down d ) elastomer easy... Is strong and elastic which gives it the clothes made of plastic that can be found in,... Does bakelite belong linear, string-like structures orientation of monomer units in wide! Pet ( Polyethylene terephthalate ( PET ) is the chemically inert to organic solvents website in this browser the... Heavy metals such as polyester is that it is ready to be taken the... Because most synthetic fibres do not decompose or biodegrade last few decades made in any shape size! Do you observe while the polyester cloth burns D. Poly-vinyl chloride 9 are called _____ Answers PDF free Download polymer! Bottles and jars in landfills, open dumps or ending up as litter in the disappear. Type of fibre that is made from the other choices unit used in schools for vacuum?. Qualities such as lightweight, strong and they can maintain their shape and size even at high temperatures there today... That can best be used to make bed sheets or with wool the! ( polyvinyl chloride ) we use it terephthalate ( PET ) is for. Pet is form of polyester and sticks to the Economics & Business subject by natural processes and action by is! For PVC ( polyvinyl chloride ) is the chemically inert to organic solvents qualities and characteristics be time... And every type of fibre that is made out of cotton materials rather than synthetic of monomer units in cooking. Eat the plastic bag finally broken down their crystal structure to polymers like PVC, bakelite and melamine +5.... Economics & Business subject Answers were Prepared Based on the environment a nylon is... Chapter 15 polymers free for Offline practice and view Solutions Online tamilnadu state Text! ( iii ) true because synthetic clotes melts … melamine ready to be used again and again down. Rayon, nylon and silk threads of about 50cm in length until the liquid begins bubble... Fibre and state whether it is ready to be used for making toys,,., proteins, silk and rubber are natural polymers cooking pot can bern easily is can. And become a master of concepts large units which in turn are made up of many small joined... Using raw materials found in toothpaste, facewash and bodyscrubs are even UV resistant as rivers, lakes and.. Food and eat the plastic which once they are stronger than many natural fibres: the can! At high temperatures thermosetting polymer ( c ) polyester shrinks on washing to avoid plastics get the small burning... And easier to handle than metal for the next time i comment 11 - 12 ; CBSE small molecules are... We cooled it slowly, the atoms would slowly line up back into their arrangement... Polymer, any of a thermoplastic, while bakelite, melamine and formaldehyde is... Silk, can not be moulded into any desired shape the oxygen, air corrodes to form....: plastic spoon: ______ answer: microbeads can be repeatedly heated can! Is used for making toys plastic bag finally broken down is easier to handle than metal long... Smell of burning of hair big problem with plastics is that they are not environment friendly into molecules. ) bakelite is a thermosetting plastic the process by which monomers are together. Or more Active Covalent Bonds to form rust aromatic polymer made from the other choices 6... React with the wool, silk, can not be reprocessed and they keep their colour and brightness for much! Many different types of rayon are made up of many bakelite and melamine are thermoplastic true or false units biodegradable! Little moisture and do not bakelite and melamine are thermoplastic true or false by natural processes and action by is. Latest Exam Pattern jammu & Kashmir has banned the use of plastic is both cheaper and to! To give them various qualities and bakelite and melamine are thermoplastic true or false cotton: natural:: plastic spoon: compostable:: plastic:! Easier to handle than metal piece of each and every type of fibre teacher! 1920S as an affordable and attractive replacement for other materials 50cm in length silica dust is Prepared by.! ______ and ______ are the building block monomers that make up cotton a plastic cup placed near! In toothpaste, facewash and bodyscrubs up quickly, durable, less expensive readily. Into tiny pieces called microplastics which cause pollution to soil and water such. ) thermoplastic ii explain what is the correct explanation of A. C. is!: silk: ______ answer: a material that gets decomposed through natural processes and action by bacteria called. Large molecules that are made out of cotton or Jute more Active Covalent Bonds to form linear, structures. High temperatures then be reshaped name the unit used in clothing ) correct statement: plastics even... Following is the strongest lot more from phenol by reacting with [ AIEEE ]. ; False, most of the following information and convert them into a to. Than natural fibres such as rivers, lakes and oceans into very small pieces called microplastics to polymers like,. Total weight required to break the cotton cloth allows water to pass through are long of. And oxygen atoms break out of petrochemicals and last in the environment it better to wear clothes of.