? (d) Wool, Question 7. Different chemicals (additives) are added to plastic to give them various qualities and characteristics. Bakelite and melamine are thermoplastics. Answer: 14. Collect different kinds of plastic products and look carefully for the resin code and/or acronym on them. True, Question 5. 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. 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. Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Which of these plastics is a polymer? We use an umbrella on rainy days. A synthetic fibre classified as polyester. Answer: View Answer. Learn important concepts related to polymers like PVC, Bakelite and lot more. Question 1. 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. Which one of the following statements is not true? Which of the following fibres is considered as the strongest natural fibre? True 8. Answer: Activity – 2 All other given statement are true. Question 3. Question 1. Question 15.12(i) Write the monomers used for getting the following polymers. Bakelite, Melamine. ______ is an example of polyester fabric. 6. Terylene. We have seen garbage dumps with different plastics. 15. 12. True or False Type Questions 1. The scale of the bacteria breaking down plastics is much slower and will therefore not solve the crisis we are facing. Melamine. Which of the following monomers form biodegradable polymers? Ramya loves to were the clothes made up of synthetic fibres. hema9950 hema9950 Answer: True , Bakelite and melamine are example of thermoplastic. … (d) All of these Answer: (a) Nylon Is the resin code safer, un safe or questionable? State, whether the following statements are True or False. Plastics which are derived from renewable resources such as corn, sugar cane, avocado seeds or shrimp cells. 5. Plastic articles are available in all possible shapes and sizes. Answer: Polyvinyl chloride has heavy metals such as cadmium and lead which are toxic and harmful to our health. 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 Across 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. Natural polymers are the products of raw materials found in nature that can be extracted. Nylon :melts on heating:: Silk: ______ D. CH 3 COCH 3. Answer: Question 6. Thermoplastic polymers can be repeatedly heated and moulded into any desired shape. PET (Polyethylene Terephthalate) is a form of polyester. (a) Both A and R are true and R is the correct explanation of A, Question 2. 5. Glass is prepared by heating (SiO) silicondi-oxide until it melts, about 1700°C and Sodium Carbonatfe is added to it. False 7. True. (b) A plastic bottle At the free end, attach a CD as plate so that weights can be placed on it. These fibres are strong and elastic which gives it the properties to bounce. (d) Plastic carry bag (i) Polyvinyl chloride . Which of these fabrics dries the fastest? Others are ‘thermosetting’: like eggs, they cannot revert to their original viscous state, and their shape is thus fixed forever, Bakelite had the distinction of … b) Plastics are not affected by heat. (a) Paper Shape material to form a cup or bowl. Test Series. FALSE; HDPE is a tough plastic used for making toys. Answer: It would take 16 to 17 generations to see the plastic bag finally broken down. Plastics have completely occupied our life. Answer: Studying NCERT Class 12 Chemistry exemplar for Chapter 15 Polymers will help you learn the concept comprehensively from the exam … Also write the false statements in their correct form. 1. 1. (d) Cotton Question 4. Answer: Question 2. Answer: Question 2. B epoxy C. C melamine. Melamine is not thermoplastics, it is thermosetting plastic. Answer: True. Answer: Examples are bakelite and melamine. What resin codes do you find? Plastics do not decompose by natural processes and action of bacteria and are therefore not biodegradable. Question 1. Which of these is a natural fibre? Reason (R) : Nylon made out of petrochemicals is non-biodegradable and cotton cloth is biodegradable. 6. Answer: (b) thermosetting polymer. Question 9. Differentiate between thermoplastic and thermosetting plastics. Assertion (A) : It is good to avoid plastics. Down: Note down the total weight required to break the cotton thread. 13. (ii) All polymers are natural materials. Question 1. Question 3. Polyamides are made with monomers. Give two examples of thermosetting plastics. Many animals confuse plastic for food and eat it by accident. Correct statement: Bakelite and and melamine are some examples of thermosettingplastic, Question 7. What is the chemical name of the polymers that make up cotton? When the liquid begins to bubble it is ready to be taken off the stove. Nylon or Polyester. (a) Bakelite (b) Teflon (c) Butyl rubber (d) Melamine formaldehyde resin Solution: (a, d) Bakelite is a condensation polymer of phenol and formaldehyde. Question 1. Question 1. Answer: Melamine is coated in the uniforms of fireman. A natural fibre obtained by boiling of cocoons is called ______. The first man-made fibre is ________ It is important to reduce the negative consequences of plastics on the environment. D. Bakelite. Name the plastic. 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(c) Acrylic, Question 5. Cotton cloth allows water to pass through whereas umbrella cloth does not allow water to pass through. PET is the acronym for ________ (c) Cotton cloth Melamine formaldehyde resin is a condensation polymer of melamine (2, 4, 6-triamino-1, 3, 5-triazine) and formaldehyde. 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 Answer: Plastics have completely occupied our life because of their characteristic qualities. BAKELITE - The birth of modem plastics reading practice test has 13 questions belongs to the Economics & Business subject. (c) Acrylic PVC; Which of the following is used to manufacture carrier bags? What does the term biodegradable mean? Soln: ... (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. 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. All other given statement are true. Spread the gel onto aluminium foil and cool. On burning wool, why we get the small of burning of hair? Let the article cool for 24 hours before we use it. NCERT Class 12 Chemistry Exemplar for Chapter 15 Polymers provide you polymer questions multiple choice, polymer MCQ for NEET, Fill in the blanks, Match the following, True or False, Worksheets, polymers Class 12 important questions, exercises and assignments. Cellulose. Animals smell the leftover food and eat the plastic by accident. Plastics have many positive qualities such as lightweight, strong and they can be moulded into complex shapes. Polystyrene 9. (a) Bakelite (b) Teflon (c) Butyl rubber (d) Melamine formaldehyde resin Solution: (a, d) Bakelite is a condensation polymer of phenol and formaldehyde. Answer: (c) Soluble in water, Question 4. A nylon thread is actually stronger than a steel wire of similar thickness. 6. A lot of plastic pollutes our environment. (c) Silk The learner can feel the fibre and write down the name of the fibre and state whether it is natural or synthetic fibre. Question 15.12(ii) Write the monomers used … ... Bakelite is obtained from phenol by reacting with [AIEEE 2008] A. HCHO. Answer: The starting monomers of bakelite are phenol and formaldehyde i.e.Bakelite is a thermosetting polymer. 4. Previous Year Papers. For making PVC pipes, which type of plastic is used? 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(iii) It is risky to wear synthetic clothes while working in … 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. (b) Paper TRUE ? (b) Plastic cutlery Class 1 - 3; Class 4 - 5; Class 6 - 10; Class 11 - 12; CBSE. (b) cotton, Question 2. (d) Wool It is not advisable to burn plastic and synthetic fabrics. 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 … Answer (a) nylon Wire made from nylon fibre is the strongest. Arrange the threads in the order of increasing strength. 5M 104. Question 15. If we cooled it slowly, the atoms would slowly line up back into their crystalline arrangement. Question 2. (a) Plastic A. Cellulose B. Starch C. Rubber D. DNA 15. Bakelite. We call materials like this as amorphous. Also, grinding anything into fine powder is terrible for your lungs. 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. Question 5. Question 5. Answer: (D) Bakelite. 4) All are correct. Join together to form polymers. 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. Why is rayon called on artificial silk? It can be broken down completely by microbes and turned back into food for plants – COz, methane, water and other natural compounds. Bakelite continues to be used for wire insulation, brake pads and related automotive components, and industrial electrical-related applications. (b) Cotton Answer: Question 3. 3. Write True or False against the following statements: a) Polyester shrinks on washing. 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