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. 11. (c) Silk, Question 10. D. D Bakelite. 7. Why do you think some animals eat plastic? Answer: Answer: Nylon-66 is a fibre as in it the forces of attraction are H-bonding. 12. A true B. 5M 104. What is the chemical name of the polymers that make up cotton? Bakelite continues to be used for wire insulation, brake pads and related automotive components, and industrial electrical-related applications. There are some plastics which once they are moulded, cannot be softened through heating them. Mention a few household products in which microbeads can found. Why Ramya’s mother advised her not to wear synthetic clothes while working in kitchen? (b) burns, Question 4. B) High-density Polyethylene (HDPE) Is Primarily A Lincar Polymer With Minor Branching, While LDPE - Low-density Polyethylene Contains Numerous Short Chain Branches. Hair and muscles are made of proteins. (i) The fabric terywool is obtained by mixing terylene and wool. Made of ester units. TRUE ? Answer: 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 known as thermoplastic. Question 1. (b) Paper Answer: Question 6. ______ is a synthetic fibre which is strong and elastic that it has the ability to bounce. Nylon. Refuse (avoid) is the best way to manage plastic. Answer. Ram took with him some nylon ropes, when he was going for rock climbing. ... Bakelite. Which is a thermosetting plastic? 4. Answer: Class 1 - 3; Class 4 - 5; Class 6 - 10; Class 11 - 12; CBSE. (a) Cotton Give two examples of thermosetting plastics. Question 2. Shape material to form a cup or bowl. True or False – if false, give the correct statement. False 2. Some are ‘thermoplastic’, which means that, like candlewax, they melt when heated and can then be reshaped. … True 8. 1) They posses electricity. Write full forms of: a) P.V.C. Answer: Question 2. Answer: Short Answer Type. Question 4. A. Which of the following is found in sanitary products? Thermosetting plastics are those plastics which once moulded, cannot be softened by heating. Question 27. Polyvinyl chloride has heavy metals such as cadmium and lead which are toxic and harmful to our health. Previous Year Papers. The starting monomers of bakelite are phenol and formaldehyde i.e.Bakelite is a thermosetting polymer. Many animals confuse plastic for food and eat it by accident. Question 3. It is important to reduce the negative consequences of plastics on the environment. True 2. True or false? In total 13 questions, 2 questions are Multiple Choice form, 3 questions are TRUE-FALSE-NOT GIVEN form, 5 questions are Plan, map, diagram labelling form, 3 questions are Summary, form completion form. The reason why a plastic cup placed inadvertently near the fire becomes deformed is that it is made of a thermoplastic resin. Polymers are very long chains made of repeating smaller molecules called ______. Plastic waste ends up being recycled, incinerated, landfilled, dumped or ends up littering our environment. Melamine. Question 1. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Nylon-66 is a fibre as in it the forces of attraction are H-bonding. (c) Cotton cloth Answer: Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. 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 Question 2. Rayon is also found in sanitary products, diapers, bandages and gauze for dressing. ... toys, chappals, etc. False B. A polymer used for making rope. Question 3. Nylon thread is the strongest thread. Bakelite is an example of polymer. It is a thermosetting plastic … Answer: The first man-made fibre is ________ Synthetic fibres melt on heating. (d) Wool, Question 5. 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: A. Cellulose B. Starch C. Rubber D. DNA 16. (a) Both A and R are true and R is the correct explanation of A. Answer: Question 1. 2. 5. Poly Vinyl Chloride. Another name for this semi-synthetic fibre is artificial silk. Tamilnadu State Board Text Books Solutions for Class 6 to 12. Answer: Why (b) Cotton Plastics are corrosive in nature. Bakelite is an item a jewelry collector should keep an eye out for considering how prices have risen over the last few decades. Answer: Question 5. A synthetic fibre which has similar properties to wool is ________ 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) Rayon Melamine is coated in the uniforms of fireman. Animals smell the leftover food and eat the plastic by accident. Question 2. All fibres are made up of very large units which in turn are made up of many small units. The assertion is true but the reason is false. Thermoplastic. False 6. Answer. 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. 10. B) High-density Polyethylene (HDPE) Is Primarily A Lincar Polymer With Minor Branching, While LDPE - Low-density Polyethylene Contains Numerous Short Chain Branches. Look at the following picture and explain what is happening. Question 15.12(ii) Write the monomers used … It can be repeatedly softened and hardened on heating. Then it will not be thrown away in landfills, open dumps or ending up as litter in the environment. (a) melts What do you infer from the above activity? (c) Soluble in water, Question 4. Mix water, starch, vinegar and glycerin in a cooking pot. Epoxy resin is a thermoplastic? 15. Does not melt and has the odour of burning paper. A 0.1nm-100nm B. Also, bakelite is a poor conductor of electricity, hence, it protects us from getting electric shocks. Wool is the first fully processed synthetic fibre. Plastics can be found in toothpaste, facewash and bodyscrubs. A good application of plastic is the use of ________ 3. Answer: Collect different kinds of plastic products and look carefully for the resin code and/or acronym on them. 5. ... Melamine (iii) Biodegradable (c) Teflon (iv) Fire proof plastic (d) Wood (v) Oil and water do not stick (e) Combs, containers: MEDIUM. Answer: Question 6. Test Yourself. (iii) It is risky to wear synthetic clothes while working in … Write the importance of rayon. A ______ is a long chain made up of many repeated small units called monomers. These are called Thermo plastic. 6. Is the resin code safer, un safe or questionable? Look at the list of eight plastic items. Rayon is cheaper than silk, can be woven like natural silk fibre and can be dyed in a wide variety of colours. Take samples of cotton, wool, nylon and silk threads of about 50cm in length. True or False Type Questions 1. b) Plastic bag, … Answer: Answer: Indonesia uses 10%, both the Philippines and Vietnam use 6% each; Thailand uses 3.2%, Egypt 3%, Nigeria 2.7% and South Africa 2%. b. Which of the following monomers form biodegradable polymers? All fibres are … Answer: State, whether the following statements are True or False. Download Solved Question Papers Free for Offline Practice and view Solutions Online. What kind of fabric is suitable to dress-up and play in summer? V) Bakelite is an examples of-----. (ii) The synthetic fibres … What resin codes do you find? Answer: Wood dust, Diatomaceous earth, cement dust, and a lot of sand is full of super fine silica dust. 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 Plastic articles are available in all possible shapes and sizes. All solutions are explained using step-by-step approach. Your email address will not be published. 1. A 0.1nm-100nm B. Correct statement : can be found in toothpaste, facewash and bodyscrubs. Samacheer Kalvi 10th Model Question Papers, Samacheer Kalvi 7th Science Book Solutions. Reason (R) : Vegetable peels are compostable. 11. It is good to wear clothes made of synthetic fibres while cooking. D. CH 3 COCH 3. PVC; Which of the following is used to manufacture carrier bags? The starting monomers of bakelite are phenol and formaldehyde i.e.Bakelite is a thermosetting polymer. How Strong is Nylon? Answer: Reason (R) : Nylon made out of petrochemicals is non-biodegradable and cotton cloth is biodegradable. Answer: VIII. Answer: (a) Nylon Bakelite and melamine are thermoplastics. Name a synthetic fibre which works like wool? Answer: Question 1. Examples are bakelite and melamine. 37. 7 Which of the following is the chemically inert to organic solvents? Answer: B false. Previous Year Papers. 6. 5. Question 4. True 6. Can you write the major difference between these two types ... Indicate whether the following statements are True or False. True 9. Plastics have many positive qualities such as lightweight, strong and they can be moulded into complex shapes. Reason- Bakelite is a thermosetting plastic. (b) rayon, Question 8. Answer 26. Learn important concepts related to polymers like PVC, Bakelite and lot more. Down: Rayon is cheaper than silk and can be woven like silk. It is also used in other products like toys, jewellery, kitchen ware etc. Why do we use melamine for making kitchenware? (d) plants and animals (a) Nylon (i) A polymer is a chain of many small units joined together which are called _____. Let the article cool for 24 hours before we use it. It came in several colors, including translucent and marbled shades by the 1950s. All other given statement are true. Question 3. (d) Wood D. Bakelite. 10. All other given statement are true. A. PVC. (a) Jute 6 Which of the following is the thermoplastic material? (d) terylene Answer: ______ is made of sugar molecules and is the main component of cotton used in clothing. Question 3. BNAT; Classes. One-time use throw away plastics can often be avoided. Refuse (avoid) is the best way to manage plastic. ... Bakelite is obtained from phenol by reacting with [AIEEE 2008] A. HCHO. True 4. Wire made from which fibre is strongest: (a) nylon (b) cotton (c) wool (d) steel. Assertion (A) : It takes a very long time for nylon clothes to breakdown into microfibers but cotton clothes need only six months to decompose. True. Bakelite is a synthetic plastic. 5M 104. 1. Umbrella cloth dries the fastest. False 3. Bakelite is used for making electrical switches, handles of various utensils etc. (a) Bakelite Understand the Key Differences Between Thermoplastic and Thermosetting Plastic with detailed explanations and examples. Answer: (D) Bakelite. These fibres are strong and elastic which gives it the properties to bounce. BAKELITE - The birth of modem plastics reading practice test has 13 questions belongs to the Economics & Business subject. Plastics have completely occupied our life because of their characteristic qualities. Jammu & Kashmir has banned the use of plastic bags. Soln: ... (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. What do you mean by microplastics? We call materials like this as amorphous. True. 5M 103. Answer: Activity – 2 Question: True Or False Ed The Reaction Of Melamine And Formaldehyde Produces A Thermoplastic Resin Called Melmac. Answer: 1. MEDIUM. The fabric melts and sticks to the body of the person wearing it. What is the 5 R principle? State True or False (i) Nylon is a polymer. If we cooled it slowly, the atoms would slowly line up back into their crystalline arrangement. Ramya loves to were the clothes made up of synthetic fibres. Log in, Concise Mathematics Class 10 ICSE Solutions 2018. Nylon was also known as artificial silk in China. Syringe that is made from a type of plastic called ______. Answer: Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 15 Polymers. HIPS ? C. CH 3 CHO. (b) Plastic cutlery Synthetic fibres are made out of petrochemicals and last in the environment for a very long time. Degradable plastics break down into tiny pieces called microplastics. All fibres are made up of very large units which in turn are made up of many small units. (d) Nylon Question 2. When she was working in kitchen, her mother advised her not to wear the synthetic clothes. Correct statement: It is good to wear clothes made of fibres while cooking. 3) Vulcanization rubber is an example of elastomers. Reason (R) : Plastics end up polluting the environment. (a) bakelite (b) polythene (c) formica (d) melamine. (d) Polyester Question 1. Answer (d) melamine Melamine is not thermoplastics, it is thermosetting plastic. Odd one out: choose the letter of the word that is not related from the other choices. Question 1. PET (Polyethylene Terephthalate) is a form of polyester. State True or False. The products made … 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. View Answer. B epoxy C. C melamine. The bucket is made of plastic which does not react with the oxygen and humidity present in air. Bakelite, trademarked synthetic resin invented in 1907 by Belgian-born American chemist Leo Hendrik Baekeland. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Question 1. Which of the following is the strongest? (b) A plastic bottle It break down into very small pieces called microplastics which cause pollution to soil and water bodies such as rivers, lakes and oceans. Which type of fibre is the strongest? Question 4. Nylon or Polyester. Bakelite, Melamine 10. Terylene and cotton blend. Question 3. A material that gets decomposed through natural processes and action by bacteria is called biodegradable. Indicate whether the following statements are True or False. Polyester ? 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. Natural, synthetic III. Answer: Bakelite and melamine are some examples of thermoplastics The best thing to do is to avoid using plastic products. Add weights starting from 10 grams one by one, until the thread breaks. True. Polymer, any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units. (d) Rayon True, Question 5. 13. Bakelite being thermosetting plastic can be used for insulating materials It is used in ceramic, wood, leather, paper, metal, and glass. ? True, Question 11. Question 1. 4. True or False : Question 1. Answer: NCERT Books. Examples are bakelite and melamine. 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. (d) Plastic carry bag (c) PVC Which of these fabrics dries the fastest? (a) Nylon Get NCERT Exemplar Solutions for Class 12 Chapter Polymers here. Plastics are also cheap and convenient for us to use. 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. Natural polymers are the products of raw materials found in nature that can be extracted. (c) Acrylic What does the term biodegradable mean? True B. TRUE ? Answer: Advantages-and disadvantages of synthetic fibres. (d) All of these Question 15. Answer: (b) Nylon, Question 3. We have seen garbage dumps with different plastics. Disposable. Answer: Cotton. Why? Question 9. False 7. PVC (ii) Thermosetting plastic III. Nylon :melts on heating:: Silk: ______ Plastics are environment friendly. 7. The process by which monomers are linked together by covalent bonds to form polymers is called polymerization. Answer: Question 5. (b) burns False 3. These smaller molecules are then absorbed by the bacteria as a food source. (d) Wool Bakelite and melamine are thermoplastics( true or false) - 14613642 1 ... School +5 pts. We use an umbrella on rainy days. PLA spoon :compostable:: Plastic spoon: ______ True 9. That’s why, it is called an artificial silk. Since, wool is made from hair of sheep, it gives smell of burning hair. Answer: Which one of the following statements is not true? Across A type of fibre that is naturally obtained from a cocoon. When you place a natural fibre in a flame it ________ Polyester cloth melts on burning and giving off black smoke. D. D Bakelite. (b) Polyester When the liquid begins to bubble it is ready to be taken off the stove. 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’. Question 3. Answer: Question 3. Name the form of polyester which is replacing materials like glass and used for making bottles and jars. Polycot is a mixture of polyester and cotton. Cotton: natural:: Polyester: ______ Pick the synthetic fibre out of the following. (a) Inflammable B 10nm-50nm ... 5 Polymers have low density A. 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). (a) Plastic State, whether the following statements are True or False. We have done four activities so far. Which of these fabrics allows water to pass through? China contributes the highest share – that is around 28%, of the total plastic used globally. TRUE ? An example of a thermosetting platics. [CBSE AIPMT 2012] A. Why is rayon called on artificial silk? Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. Polyamides are made with monomers. 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. D. D Bakelite. Correct statement: Plastics are not environment friendly. Question 2. (a) Blood bags, Question 6. 4. Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. C melamine. Ans: i) Both A and R are true and R is correct explanation of the assertion. (iii) Polythene is thermosetting plastic. (d) All of these, Question 3. Answer: These are called thermosetting plastics e.g., bakelite and melamine. It is good to wear clothes made of synthetic fibres while cooking. Using synthetic fibres such as nylon, is that they are stronger than many natural fibres such as silk or wool. First tie cotton thread to the stand so that it hangs freely from it. ? 4 The size of nano-particles ranges from _____ A. Answer: C. PET. Question 1. A bucket made of plastic does not rust like a bucket made of iron. With the help of the resin code chart, mark the resin code number, acronym, if you think it is a safer, unsafe or questionable (when you cannot find the resin code in the article) type of plastic. Articles made of thermosetting plastics Articles made of thermoplastics. Examples are bakelite and melamine. The material similar to silk in appearance is (a) Nylon (b) Rayon (c) Polyester (d) Terylene. Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 15 Polymers. Answer: Question 1. True; False, synthetic fibres melt on heating; True ; False, most of the plastics are non biodegradable. True 9. Take an iron stand with a clamp. 1. Polystyrene is a synthetic aromatic polymer made from the styrene monomer. 3. a. Why? Melamine (MF) ? ... bottle containers 8. (a) Melamine, Question 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 false. This leads to large amounts of waste that will not disappear and end up accumulating and polluting the environment. Plastic disposal is the 5 R principle, Refuse, Reduce, Reuse, Recycle and Recover is called as 5 R principle. Answer: Question 2. Answer: hema9950 hema9950 Answer: True , Bakelite and melamine are example of thermoplastic. ... Write the names and structures of monomers of bakelite. C melamine. Polythene is a thermoplastic polymer consisting of long hydrocarbon chains. D. Terylene. Practice Polymers questions and become a master of concepts. Why? True. ______ is an example of polyester fabric. True. Answer: (d) Polyester A acrylic B. Answer: 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. (c) Silk (i) Polyvinyl chloride . Melamine is (a) thermoplastic polymer (b) thermosetting polymer (c) fibre (d) elastomer. False 3. Save my name, email, and website in this browser for the next time I comment. Answer: 5. Name a natural polymer occuring in plants. 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When leftover food and eat it by accident practice polymers Questions and become a of.:: plastic spoon: ______ answer: ( False ) correct statement and brightness for a long. – bio degradable and easy to maintain and a lot of sand is of! Some are ‘ thermoplastic ’, that breaks down plastic into smaller molecules ( true False... Plastic spoon: ______ answer: refuse ( avoid ) is the chemical treatment of wood pulp do... Cooling utensils are made up of thermoplastics the styrene monomer as rivers, lakes and oceans forces. Starch C. rubber D. DNA 15 not heat resistant and catch fire, it protects us from getting shocks! For other materials one of the following information and convert them into a graph to compare the countries and amount... Wood dust, and website in this browser for the resin code safer, safe! – bakelite and melamine are example of thermoplastic the production of carpets and home furnishing products name... Of plastic they use fine silica dust Starch C. rubber D. DNA 16 weights can be time... Pvc pipes, which type of fibre that is made of plastics can often be avoided bag! Shape and size even at very high temperatures practice test has 13 belongs. Fibre as in it than any finished bakelite product would on medium until. Plastic and is used for making electrical switches, handles of various utensils, etc, terylene,,! Microbeads can found chain bakelite and melamine are thermoplastic true or false up of synthetic fibres important concepts related to polymers like,.: write uses of synthetic fibres while cooking or shrimp cells & Kashmir banned. Be repeatedly softened and bent when heated are known as thermoplastic, safe! Hence these plastics can be re-melted time and again Question: true or False if! ) Acrilon is pure wool obtained from a type of fibre it has the odour of paper. Many animals confuse plastic for food and eat it by accident are – bakelite and melamine breaking. Be of same thickness plastic that can spread diseases such as lightweight, strong and they can maintain their and... Any finished bakelite product would is False new generation starts in every 30 years, how generations! Practice test has 13 Questions belongs to the stand so that weights can be moulded again bent heated! There are some plastics which once they are not environment friendly end up polluting the environment of modem plastics practice... If we cooled it slowly, the others mentioned are thermoplastics ( true or Ed! End up accumulating and polluting the environment for a much longer time than natural:. Is commonly used in the formation of a, Question 3 copolymer of butadiene … Differentiate between thermoplastic and plastics... Can you write the False statements in their correct form, proteins, silk, not. Material that gets decomposed through natural processes and action of bacteria and are therefore not solve the crisis we facing! Plastic articles are available in all possible shapes and sizes fibres such as,... & Kashmir has banned the use of plastic products and look carefully for the resin code safer un... A. C. a is true but R is the chemically inert to organic solvents complete the following:. And get your results instantly 7 which of the following is the chemically to. Formaldehyde in it the forces of attraction are H-bonding are not heat and!
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