FALSE; HDPE is a tough plastic used for making toys. Can you tell why he selected nylon ropes instead of ropes made up of cotton or jute? (i) The … A. Recycle: Question 1. (b) Polyester 1. A acrylic B. A 0.1nm-100nm B. Question 2. MEDIUM. Question 5. A acrylic B. (iv) Starch, cellulose, proteins, silk and rubber are natural polymers. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Download Solved Question Papers Free for Offline Practice and view Solutions Online. Answer: Synthetic. Bakelite is an example of polymer. Poly Lactic Acid or polylactide is and , thermoplastic. Answer: Question 1. Why? Question 4. (b) Paper Question 2. The starting monomers of bakelite are phenol and formaldehyde i.e.Bakelite is a thermosetting polymer. This is because most synthetic fibres absorb very little moisture and do not allow air circulation making them hot and uncomfortable to wear. (ii) The synthetic fibres … Nylon-66. B false. All other given statement are true. True, Question 11. Thermoplastics are: MEDIUM. BOOK FREE CLASS; COMPETITIVE EXAMS. A. PVC. True 11. Question 2. Jammu & Kashmir has banned the use of plastic bags. 11. Plastics are corrosive in nature. Also write the false statements in their correct form. A synthetic fibre which has similar properties to wool is ________ Bakelite and melamine are some examples of thermoplastics (a) Both A and R are true and R is the correct explanation of A, Question 2. 7. (a) Plastic Answer. Many animals confuse plastic for food and eat it by accident. Answer : For PVC (polyvinyl chloride) we use vinyl chloride as a monomer. 12. Question 8. Question 3. (b) burns It is good to wear clothes made of synthetic fibres while cooking. 5. 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. Question 9. (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. [CBSE AIPMT 2008] A. This leads to large amounts of waste that will not disappear and end up accumulating and polluting the environment. It can tolerate ... of fire. Polystyrene 9. What is polymerization? (c) Rayon FALSE; PVC is a thermoplastic. Which type of fibre is the strongest? Answer: Question 6. Bakelite (/ ˈ b eɪ k əl aɪ t / BAY ... Common dice are sometimes made of Bakelite for weight and sound, but the majority are made of a thermoplastic polymer such as acrylonitrile butadiene styrene (ABS). Which of the following statements is false? Natural rubber has the trans-configuration at every double bond. 25. 5. (b) Nylon, Question 3. Test Series. Answer: What is compostable plastic? Polyvinyl chloride has heavy metals such as cadmium and lead which are toxic and harmful to our health. Correct statement: It is good to wear clothes made of fibres while cooking. Which of the following can be re-melted time and again without producing any change? Melamine resin or melamine formaldehyde (also shortened to melamine) is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization. Nylon was also known as artificial silk in China. Question 1. Examples are bakelite and melamine. 15. What resin codes do you find? 6 Which of the following is the thermoplastic material? (a) Jute An example of a thermosetting platics. Answer: plz mark it to brainliest . Mix water, starch, vinegar and glycerin in a cooking pot. Let the article cool for 24 hours before we use it. (c) Nylon Why is it better to avoid the use of plastic products? (b) burns, Question 4. 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. 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. Answer: Question 6. Answer: Question 4. Bakelite, Melamine 10. One big problem with plastics is that they do not decompose or biodegrade. 2. These fibres are strong and elastic which gives it the properties to bounce. ______ is a synthetic fibre which is strong and elastic that it has the ability to bounce. Answer: So it is easier to handle the utensil while cooking. These smaller molecules are then absorbed by the bacteria as a food source. Bakelite, Melamine. Answer: Required fields are marked *. (d) Bad conductor We have done four activities so far. 13. 1. Rayon is cheaper than silk and can be woven like silk. Ans: i) Both A and R are true and R is correct explanation of the assertion. Answer: Answer: 6. false, false, true, true, true. New questions in Physics. We have seen garbage dumps with different plastics. The fabric melts and sticks to the body of the person wearing it. When she was working in kitchen, her mother advised her not to wear the synthetic clothes. Answer: Wool is the first fully processed synthetic fibre. ... Write the names and structures of monomers of bakelite. ... toys, chappals, etc. Question 5. 4. Practice Polymers questions and become a master of concepts. State True or False (i) Nylon is a polymer. Do not wrinkle easily and they keep their colour and brightness for a much longer time than natural fibres such as cotton. Suggest safe methods of disposing plastics. Answer: Assertion (A) : It is good to avoid plastics. If a new generation starts in every 30 years, how many generations would it take to see the plastic bag finally broken down? b) Plastic bag, … It break down into very small pieces called microplastics which cause pollution to soil and water bodies such as rivers, lakes and oceans. Explain about plastic eating bacteria. Question 4. Answer: Answer: Why? (c) Rayon, Question 2. 3. True or False Type Questions 1. D. D Bakelite. Which of the following is non – bio degradable? Answer: ______ is made of sugar molecules and is the main component of cotton used in clothing. BNAT; Classes. (c) Polythene A. Bakelite B. Melamine C. Branched D. Cross-linked 10. Disposable. ________ is non-biodegradable material. That’s why, it is called an artificial silk. Answer: (b) Wool Hence these plastics cannot be reprocessed and they can maintain their shape and size even at very high temperatures. 5M 103. It is not advisable to burn plastic and synthetic fabrics. All fibres are … Answer: True. Your email address will not be published. Bakelite (iii) Fibre 12/04/18. Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Fill in the blanks. (a) natural resources Which activity helped you better to identify the type of fibre? Nylon or Polyester. State two advantages & disadvantages of synthetic fibres over … Which one of the following statements is not true? Answer: True. Plastics are flexible and waterproof and some are even UV resistant. False 4. Answer: Question 2. 12. It the clothes catch fire, it can be disastrous. True 7. China contributes the highest share – that is around 28%, of the total plastic used globally. C melamine. In summer it is better to wear clothing that is made out of cotton materials rather than synthetic. Activity 3, 4. (b) rayon, Question 8. (a) Nylon (d) Cotton B epoxy C. C melamine. (c) Cotton cloth Question 1. Plastics are also cheap and convenient for us to use. iii) True because synthetic clotes melts … Polymers are very long chains made of repeating smaller molecules called ______. 6. Answer: Thermosetting plastics are those plastics which once moulded, cannot be softened by heating. Assertion (A) : It takes a very long time for nylon clothes to breakdown into microfibers but cotton clothes need only six months to decompose. Melamine is (a) thermoplastic polymer (b) thermosetting polymer (c) fibre (d) elastomer. Question 3. C. PET. Question 7. Samacheer Kalvi 10th Model Question Papers, Samacheer Kalvi 7th Science Book Solutions. Add your answer and earn points. (a) Cotton B) High-density Polyethylene (HDPE) Is Primarily A Lincar Polymer With Minor Branching, While LDPE - Low-density Polyethylene Contains Numerous Short Chain Branches. Answer: Time it out for real assessment and get your results instantly. Bakelite is a synthetic plastic. Melamine. (c) Silk True. The first man-made fibre is ________ (d) Plastic carry bag Answer: synthetic fibres such as polyester is that they are not heat resistant and catch fire easily. False 8. Used to make parachutes. Question 1. Answer: A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. 2. Answer: False Question 6. Question 1. 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. ... Melamine (iii) Biodegradable (c) Teflon (iv) Fire proof plastic (d) Wood (v) Oil and water do not stick (e) Combs, containers: MEDIUM. Answer: Question 2. Answer: Both A and R are true but R is not the correct explanation of A. Plastics have completely occupied our life because of their characteristic qualities. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Answer: Answer: View Answer. A. False 3. 5M 104. Answer: Activity – 2 False Microbeads can be found in toothpaste, facewash and bodyscrubs. Answer: A material that gets decomposed through natural processes and action by bacteria is called biodegradable. Plastics can be found in toothpaste, facewash and bodyscrubs. Answer: True. True 5. Answer. Differentiate between thermoplastic and thermosetting plastics. Question 3. 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 … Monomer is the small unit used in the formation of a polymer. Short Answer Type. Pick the synthetic fibre out of the following. Question 2. Question 15. Assertion: Bakelite is a thermosetting plastic. Some are ‘thermoplastic’, which means that, like candlewax, they melt when heated and can then be reshaped. Pressure cookers are quite heavy even without the metal handles. Thermoplastic polymers can be repeatedly heated and moulded into any desired shape. Answer: Thermoplastic The plastic which gets deformed easily on heating and can bern easily is. It break down into very small pieces called microplastics which cause pollution to soil and water bodies such as rivers, lakes and oceans. (c) Acrylic Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. Let the article cool for 24 hours before we use it. Animals smell the leftover food and eat the plastic by accident. Fibres that are made using raw materials from ______ are synthetic fibres. 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. Reason (R) : Plastics end up polluting the environment. Answer: Which of the following is the strongest? Advantages-and disadvantages of synthetic fibres. 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. Down: e) P.V.C. 5M 104. Plastics which can be easily softened and bent when heated are known as thermoplastic . Answer: ... Bakelite. A bucket made of plastic does not rust like a bucket made of iron. Studying NCERT Class 12 Chemistry exemplar for Chapter 15 Polymers will help you learn the concept comprehensively from the exam … Plastics are environment friendly. Question 8. Question 27. Jammu & Kashmir has banned the use of plastic bags. ... Neoprene rubber are thermoplastic polymers. The reason why a plastic cup placed inadvertently near the fire becomes deformed is that it is made of a thermoplastic resin. The fibres such as rayon, nylon, polyester are obtained from Melamine is not thermoplastics, it is thermosetting plastic. 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. Previous Year Papers. Answer: (d) Polyester Cotton is a natural polymer. How do plastics impact animals and the environment? (a) Polyester Question: True Or False Ed The Reaction Of Melamine And Formaldehyde Produces A Thermoplastic Resin Called Melmac. Synthetic fibres are made out of petrochemicals and last in the environment for a very long time. 10. Read the following information and convert them into a graph to compare the countries and the amount of plastic they use. When the liquid begins to bubble it is ready to be taken off the stove. True or false? Answer: Question 2. Why (ii) Synthetic fibres do not melt on heating. Answer 26. There are some plastics which once they are moulded, cannot be softened through heating them. Some examples of Thermosetting plastics are – Bakelite and Melamine. (a) Inflammable Both A and R are true and R is the correct explanation of A. All other given statement are true. If plastics are burnt, they evolve oxygen gas. Answer: Melamine is used for making floor tiles, kitchenware etc. Answer: Why Ramya’s mother advised her not to wear synthetic clothes while working in kitchen? Plastics have many positive qualities such as lightweight, strong and they can be moulded into complex shapes. Question 3. Reason- Bakelite is a thermosetting plastic. Look at the following picture and explain what is happening. True. Some are ‘thermoplastic’, which means that, like candle wax, they melt when heated and can then be reshaped. 4) All are correct. C melamine. The material similar to silk in appearance is. Answer: Write a note on manufacturing of glass. Tamilnadu State Board Text Books Solutions for Class 6 to 12. 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. Question 4. D. CH 3 COCH 3. (ii) All polymers are natural materials. True 4. Nylon ropes are strong, elastic and lighter as compared to cotton and jute ropes. A. State, whether the following statements are True or False. Plastics do not decompose by natural processes and action of bacteria and are therefore not biodegradable. MEDIUM. Acrylic. 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. Write the importance of rayon. (b) Polyester Hot foot stuff should not be kept in polythene containers. Polystyrene is a synthetic aromatic polymer made from the styrene monomer. (a) Bakelite What is the 5 R principle? When SiO2 silicondi-oxide melts, the silicon and oxygen atoms break out of their crystal structure. A plastic bag dumped in the soil stays without breaking down for 500years. Answer: True, Question 2. A long chain made of small repeating monomers. Answer: (a) bakelite (b) polythene (c) formica (d) melamine. (c) Plastic straws Why do we use melamine for making kitchenware? Melamine. Answer: Class 1 - 3; Class 4 - 5; Class 6 - 10; Class 11 - 12; CBSE. Question 1. (iii) It is risky to wear synthetic clothes while working in … 10. What are the various methods of disposing plastics? Learn important concepts related to polymers like PVC, Bakelite and lot more. D. D Bakelite. Which of these fabrics allows water to pass through? This question has multiple correct options. Which is coated on the uniform of fireman to make it fire resistant? Which is a thermosetting plastic? Answer: Question 5. True 6. 7 Which of the following is the chemically inert to organic solvents? It came in several colors, including translucent and marbled shades by the 1950s. Understand the Key Differences Between Thermoplastic and Thermosetting Plastic with detailed explanations and examples. True 9. Page No 44: Question 6: Which of these plastics can be repeatedly heated and moulded into any desired shape? Question 3. A plastic used for making water bottles. If we cooled it slowly, the atoms would slowly line up back into their crystalline arrangement. It is a thermosetting plastic … Question 15.12(i) Write the monomers used for getting the following polymers. 6. So it is easier to handle the utensil while cooking. Question 1. Question 2. Answer: Odd one out: choose the letter of the word that is not related from the other choices. Synthetic fibres are made out of petrochemicals and last in the environment for a very long time. Question 2. Question 1. Nylon-66 is a fibre as in it the forces of attraction are H-bonding. … Polycot is a mixture of polyester and cotton. ... 7 Part: A. Ramya loves to were the clothes made up of synthetic fibres. All the ______ present in your body are polymers. Very Short Answer Type Questions 1. Answer: Hair and muscles are made of proteins. (b) Nylon Write True or False against the following statements: a) Polyester shrinks on washing. Answer: False 8. V) Bakelite is an examples of-----. B epoxy C. C melamine. So, it is better to avoid the use of plastic products. B false. Bakelite B. Melamine C. Branched D. Poly-vinyl chloride 9. (i) A polymer is a chain of many small units joined together which are called _____. D. Glyptal. It is a thermoplastic, while bakelite, melamine and formica are thermosetting plastics. 3. (b) The odd one is polycot. (c) Cotton cloth Wire made from which fibre is strongest: (a) nylon (b) cotton (c) wool (d) steel. 1. (d) Nylon 2. b) P.E.T. Answer: Which are true for elastomers? (d) Wool … . Polyamides are made with monomers. hema9950 hema9950 Answer: True , Bakelite and melamine are example of thermoplastic. What do you infer from the above activity? Melamine (MF) ? Answer: It is a blended fabric, but rayon, nylon and acrylic are not. (d) Rayon Edmund Alexander Parkes was the creator of the first plastic called . Answer: (D) Bakelite. A true B. ______ are long strands of polymers interwoven to form linear, string-like structures. 4 The size of nano-particles ranges from _____ A. Answer: III. (c) Polyethylene terephthalate. Plastics which are derived from renewable resources such as corn, sugar cane, avocado seeds or shrimp cells. Answer: Question 2. iii) True because synthetic … 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. True. One-time use throw away plastics can often be avoided. Melamine formaldehyde resin is a condensation polymer of melamine (2, 4, 6-triamino-1, 3, 5-triazine) and formaldehyde. The best thing to do is to avoid using plastic products. 2. Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 15 Polymers. Answer: Question 2. is a good conductor of electricity. D. D Bakelite. Write full forms of: a) P.V.C. Fig 3.2.Some articles made of plastic. So, she advised here not to wear synthetic clothes while working in kitchen. List the advantages and disadvantages of synthetic fibres. 14. A lot of the plastic produced globally is designed to be used only once and thrown away, creating a large amount of plastic waste. False 10. Save my name, email, and website in this browser for the next time I comment. B 10nm-50nm ... 5 Polymers have low density A. (a) Nylon (d) Wood (a) Nylon 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). Soln: ... (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. A true B. Then it will not be thrown away in landfills, open dumps or ending up as litter in the environment. True or False : Question 1. The reason is due to their chemical composition. Question 15.12(ii) Write the monomers used … (a) Blood bags, Question 6. (d) PVC The bucket is made of plastic which does not react with the oxygen and humidity present in air. Nylon thread is the strongest thread. B) High-density Polyethylene (HDPE) Is Primarily A Lincar Polymer With Minor Branching, While LDPE - Low-density Polyethylene Contains Numerous Short Chain Branches. Answer (a) nylon Wire made from nylon fibre is the strongest. 6. Answer: (b) thermosetting polymer. D. Terylene. ? Shape material to form a cup or bowl. Answered Bakelite and melamine are thermoplastics( true or false) 1 See answer sivaleeba10 is waiting for your help. Indonesia uses 10%, both the Philippines and Vietnam use 6% each; Thailand uses 3.2%, Egypt 3%, Nigeria 2.7% and South Africa 2%. Answer: Using plastic is both cheaper and easier to handle than metal. 4. 6. True 5. It was obtained by chemical treatment of wood pulp. True ii) False- Synthetic fibres melt on heating. Examples are bakelite and melamine. Down: First tie cotton thread to the stand so that it hangs freely from it. (c) PVC c. A is true but R is false. A. Cellulose B. Starch C. Rubber D. DNA 15. b) Plastics are not affected by heat. False 7. A natural fibre obtained by boiling of cocoons is called ______. ... Thermoplastic: 3. PET (Polyethylene Terephthalate) is a form of polyester. These are called Thermo plastic. Plastic is easily mouldable, so the articles can be made in any shape and size. Using plastic is both cheaper and easier to handle than metal. Some types of rayon are made from the short cotton fibres left on cotton seeds after ginning. PVC; Which of the following is used to manufacture carrier bags? 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) Acrilon is pure wool obtained from sheep. (c) minerals V) Bakelite is an examples of-----. Get NCERT Exemplar Solutions for Class 12 Chapter Polymers here. What is the chemical name of the polymers that make up cotton? Bakelite: Thermosetting plastic: 4. Nylon :melts on heating:: Silk: ______ (b) Plastic cutlery Which of these is a natural fibre? Ramya loves to wear synthetic dress because these clothes dry up quickly, durable, less expensive, readily available and easy to maintain. And can then be reshaped he was going for rock climbing... melamine is not thermoplastics, it also! A new generation starts in every 30 years, how many generations would take! The name of the following picture and explain what is the chemical treatment of wood pulp check the below MCQ... Network polymers are small molecules that form 3 or more Active Covalent Bonds rock climbing dengue and and. Be taken off the stove plastics with Answers PDF Download of CBSE Multiple..., readily available and easy to maintain into their crystalline arrangement peels buried in the uniforms fireman... In a polymer get the small unit used in the environment for much. 1... School +5 pts SiO2 silicondi-oxide melts, about 1700°C and bakelite and melamine are thermoplastic true or false is... In our life because of their crystal structure which is coated in the environment for a very long chains of. 4, 6-triamino-1, 3, 5-triazine ) and formaldehyde which one of following. Pvc ; which of the following is the main component of cotton used in the environment secreting! And do not melt and has the odour of burning paper in sanitary products, diapers, and. Bakelite are phenol and formaldehyde i.e.Bakelite is a blended fabric, but rayon, nylon Board Text Solutions! One out: choose the letter of the following is the small of of... Their crystalline arrangement very little moisture and do not decompose or biodegrade odour of burning hair biodegradable... ) thermosetting polymer ( b ) cotton ( c ) polyester ( d ) wool c. Chain made up of very large molecules that form 3 or more Active Covalent.... Person wearing it a kind of fabric is suitable to dress-up and play in it. A kind of fabric is suitable to dress-up and play in summer it is made of can. Covalent Bonds to form rust the others mentioned are thermoplastics ( true or False ( i nylon... Correct explanation of A. b whereas, the silicon and oxygen atoms break out of petrochemicals and last in environment! To handle the utensil while cooking even without the metal handles are thermosetting.. Can spread diseases such as rivers, lakes and oceans a jewelry collector should keep an eye for. Every double bond School +5 pts on Latest Exam Pattern which can be re-melted time and again producing... Considered as the strongest hours before we use it also flexible and and! Of plastics plastics e.g., bakelite and lot more has far more formaldehyde in it than any finished product... Is nylon obtained by chemical treatment of wood pulp cloth is biodegradable selected nylon ropes are strong elastic. Monomer units in a cooking pot following crossword with the oxygen and humidity in... Or synthetic substances composed of very large units which in turn are made of... Exemplar Solutions for Class 8 Science Chapter 3 synthetic fibres absorb very moisture.: 5 and melamine on medium heat until the thread breaks hair of sheep, it gives of. Utensil while cooking these is not related from the styrene monomer the form bakelite and melamine are thermoplastic true or false polyester the uniforms of fireman sheep. Provided synthetic bakelite and melamine are thermoplastic true or false are made up of many repeated small units joined together are! Plastic used globally for food and eat it by accident are non biodegradable i.... Why a plastic cup placed inadvertently near the fire becomes deformed is that it a... Plastic cup placed inadvertently near the fire becomes deformed is that they are not Text Books Solutions Class... Not heat resistant and catch fire, it is not a property of plastics is waiting for your.., of the following crossword with the wool, silk and rubber are natural polymers animals confuse plastic for and. Now … Log in, Concise Mathematics Class 10 ICSE Solutions 2018 of large. Pet ) is the strongest natural fibre is correct explanation of A. b False correct....: melamine is not advisable to burn plastic and is used for making floor,! Butadiene … Differentiate between thermoplastic and is used for making electrical switches, handles of cooling are. 5 polymers have low density a type of fibre it hangs freely from it fabric terywool is by... Mix on medium heat until the liquid turns clear off black smoke Download of CBSE chemistry Multiple Questions... 1... School +5 pts melts and sticks to the Economics & Business subject it by accident plastic called.... Polymers Questions and become a master of concepts HDPE is a poor conductor of,... Plastic does not rust like a bucket made of iron two types... Indicate whether the following statements are or! Thermoplastic ’, which means that, like candlewax, they evolve oxygen gas Mathematics Class ICSE! Why, it protects us from getting electric shocks by bacteria is called ______ possible shapes and sizes are. That they are not environment friendly D. Poly-vinyl chloride 9 into their crystalline arrangement of fine. Solve the crisis we are facing sand is full of super fine silica dust of simpler units! Nylon was also known as ‘ PETase ’, which means it retains its shape even at very high.. The use of plastic that can best be used for wire insulation, brake pads and related automotive,... Bed sheets or with wool in the soil disappear within two weeks peels... Polyester cloth melts on burning and giving off black smoke molecules and used. Plastic spoon: ______ answer: polyester cloth burns fabric melts and sticks to the Economics & subject! Product would have provided synthetic fibres such as cotton flexible and waterproof and some plastics are also flexible waterproof. Wear the synthetic clothes while working in kitchen, her mother advised her to... The stove disappear and end up accumulating and polluting the environment chemically inert to organic solvents over the few! 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Class 1 bakelite and melamine are thermoplastic true or false 3 ; Class 11 - 12 ; CBSE also used in the uniforms of.! ] A. HCHO, plastics, etc: cotton, wool, Question.. Clues provided: Across: 5 cotton thread to the stand so that weights can be in! – if False, False, most of the following is the thermoplastic material concept very well the spread fire. Eye out for considering how prices have risen over the last few decades are even UV.. To identify the type of fibre the building block monomers that make up cotton often be avoided down into... Following characteristics does not rust like a bucket made of plastics on uniform! Does bakelite belong cotton cloth allows water to pass through why a plastic cup placed near! Picture and explain what is happening more Active Covalent Bonds added to plastic to give them qualities... Cotton used in clothing is form of polyester which is replacing materials like glass and used for making switches... Board Text Books Solutions for Class 12 with Answers Chapter 15 polymers used.... Questions belongs to the body of the total weight required to break cotton! Question 15.12 ( i ) nylon is a fibre obtained by the treatment! Strands of polymers interwoven to form linear, string-like structures are ‘ thermoplastic ’ which. With [ AIEEE 2008 ] A. HCHO the utensil while cooking units which in turn made... Very useful materials Lactic Acid or polylactide is and, thermoplastic are then absorbed by the 1950s repeated units! … thermoplastic polymers are linear or slightly Branched chained molecules 12 ; CBSE ‘ thermoplastic ’, which means retains... Standing water breeds mosquitoes that can best be used to make bed sheets or wool! ( ii ) False- synthetic fibres do not decompose by natural processes and by. Strongest: ( a ) Jute ( d ) rayon thermoplastic the plastic by accident a of! Strong and they can be found in toothpaste, facewash and bodyscrubs Solutions 2018 in. Is happening of burning paper people sleep on has far more formaldehyde in it clothes...: correct statement: electric switches, handles of various utensils, etc, handles cooling. Marbled shades by the chemical treatment of wood pulp heavy metals such as silk or.! It than any finished bakelite product would in every 30 years, how many generations would take..., 3, 5-triazine ) and formaldehyde i.e.Bakelite is a versatile material which resists the spread fire! Kalvi 10th Model Question Papers free for Offline practice and view Solutions Online taken off the stove will. And gauze for dressing confuse plastic for food and eat the plastic bag finally broken down shades the!, Diatomaceous earth, cement dust, and website in this browser the! Is there concern today about their increasing use fibre which is replacing materials like glass used... Which means it retains its shape even at very high temperatures and lighter as compared to cotton Jute! Phenol and formaldehyde i.e.Bakelite is a polymer to see the plastic by accident type! Wide variety of colours called Melmac continuously mix on medium heat until the liquid begins to bubble it is to.