Melamine. True 4. (c) polyester Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Name the unit used in the formation of a polymer. Why do we use melamine for making kitchenware? Answer: Look at the list of eight plastic items. Answer: The fabric melts and sticks to the body of the person wearing it. The bacteria works by secreting an enzyme known as ‘PETase’, that breaks down plastic into smaller molecules. Save my name, email, and website in this browser for the next time I comment. A. Cellulose B. Starch C. Rubber D. DNA 15. What is the chemical name of the polymers that make up cotton? Spread the gel onto aluminium foil and cool. How do plastics impact animals and the environment? The material similar to silk in appearance is. Polyester ? (b) Polyester Bakelite and melamine are thermoplastics( true or false) - 14613642 1 ... School +5 pts. Time it out for real assessment and get your results instantly. Also, grinding anything into fine powder is terrible for your lungs. (i) The … What kind of fabric is suitable to dress-up and play in summer? 37. ... For examples bakelite and urea-formaldehyde resin etc. ... Thermoplastic 8. low absorbity of water 9. Assertion: Bakelite is a thermosetting plastic. d. A is false but R is true. (d) Nylon Question 15.12(ii) Write the monomers used … D. D Bakelite. The reason why a plastic cup placed inadvertently near the fire becomes deformed is that it is made of a thermoplastic resin. 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. True; False, synthetic fibres melt on heating; True ; False, most of the plastics are non biodegradable. True 5. Polystyrene and PVC are thermoplastics. Fibres that are made using raw materials from ______ are synthetic fibres. Polymers are very long chains made of repeating smaller molecules called ______. It is important to reduce the negative consequences of plastics on the environment. Answer: 5. Plastics do not decompose by natural processes and action of bacteria and are therefore not biodegradable. Answer: True. Answer: Standing water breeds mosquitoes that can spread diseases such as malaria dengue and chickungunya and also lead to flooding. Plastics are also cheap and convenient for us to use. Which of the following fibres is considered as the strongest natural fibre? To which class, thermoplastic and thermosetting does bakelite belong? False 4. Bakelite is a synthetic plastic. (ii) Synthetic fibres do not melt on heating. In summer it is better to wear clothing that is made out of cotton materials rather than synthetic. (d) Polyester Cotton. Some are ‘thermoplastic’, which means that, like candle wax, they melt when heated and can then be reshaped. Your email address will not be published. A plastic used for making water bottles. Question 4. Answer (a) nylon Wire made from nylon fibre is the strongest. Ans: i) Both A and R are true and R is correct explanation of the assertion. Polystyrene is a synthetic aromatic polymer made from the styrene monomer. ... Melamine is … 12. Question 1. True or False : Question 1. Question 7. Bakelite. BAKELITE - The birth of modem plastics reading practice test has 13 questions belongs to the Economics & Business subject. 5. (c) Silk The first man-made fibre is ________ ? it is a kind of plastic which once moulded cannot be moulded again. Melamine formaldehyde resin is a condensation polymer of melamine (2, 4, 6-triamino-1, 3, 5-triazine) and formaldehyde. (d) plants and animals [CBSE AIPMT 2012] A. B) High-density Polyethylene (HDPE) Is Primarily A Lincar Polymer With Minor Branching, While LDPE - Low-density Polyethylene Contains Numerous Short Chain Branches. Which one of the following statements is not true? Synthetic fibres are made out of petrochemicals and last in the environment for a very long time. Also write the false statements in their correct form. Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. Answer: B. Buna-S is a copolymer of butadiene … ________ is non-biodegradable material. Advantages-and disadvantages of synthetic fibres. All other given statement are true. Synthetic fibres are made out of petrochemicals and last in the environment for a very long time. Question 8. (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. Answer: (b) Cotton Answer: The reason is due to their chemical composition. Made of ester units. Explain about plastic eating bacteria. Answer: 6. The reason why a plastic cup placed inadvertently near the fire becomes deformed is that it is made of a thermoplastic resin. Let the article cool for 24 hours before we use it. It break down into very small pieces called microplastics which cause pollution to soil and water bodies such as rivers, lakes and oceans. Rayon is a fibre obtained by the chemical treatment of wood pulp. 5 Polymers have low density A. A. Cellulose B. Starch C. Rubber D. DNA 16. Plastics are corrosive in nature. Answer: Give two examples of thermosetting plastics. Question 2. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Why is it better to avoid the use of plastic products? 5M 104. FALSE; Which of the following is commonly used in schools for vacuum forming? A. Bakelite B. Melamine C. Branched D. Cross-linked 10. (c) Rayon (c) Soluble in water ______ and ______ are the building block monomers that make up many different types of plastics. Rayon is a synthetic fibre having properties similar to that of silk. Degradable plastics break down into tiny pieces called microplastics. Bakelite continues to be used for wire insulation, brake pads and related automotive components, and industrial electrical-related applications. What do you observe while the polyester cloth burns? ______ is made of sugar molecules and is the main component of cotton used in clothing. (i) A polymer is a chain of many small units joined together which are called _____. (d) terylene All the ______ present in your body are polymers. Which are true for elastomers? (c) gets nothing Answer: (D) Bakelite. 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’. What kind of umbrella do we use? Question 10 Assertion (A) : It is good to avoid plastics. Nylon. Question: True Or False Ed The Reaction Of Melamine And Formaldehyde Produces A Thermoplastic Resin Called Melmac. Answer: What is thermoplastics and thermosetting plastics? Both A and R are true but R is not the correct explanation of A. Class 1 - 3; Class 4 - 5; Class 6 - 10; Class 11 - 12; CBSE. 5M 103. Nylon-66. When the liquid begins to bubble it is ready to be taken off the stove. It is a thermoplastic, while bakelite, melamine and formica are thermosetting plastics. Your email address will not be published. The material similar to silk in appearance is (a) Nylon (b) Rayon (c) Polyester (d) Terylene. (d) Plastic carry bag Answer: True 2. Which of the following is non – bio degradable? New questions in Physics. When leftover food is thrown away it is often packed in plastic. False 8. 5M 103. 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 MCQ Questions for Class 8 Science with Answers, Selina Concise Mathematics Class 10 ICSE Solutions 2020-21, Human Eye and Colourful World Class 10 Extra Questions with Answers Science Chapter 11, Download Social Science Notes PDF for CBSE Class 6 to Class 10 Quick Revision, Science Notes | Quick Revision Notes for CBSE Class 6 to Class 10 Science – Free PDF Download, Download CBSE Maths Notes for 6 to 12 Classes | NCERT Maths Quick Revision Notes for Class 6 to 12 Free PDF, MCQ Questions for Class 11 Economics with Answers Chapter Wise PDF Download, Download All Chapters Social Science NCERT Solutions Pdf for Class 6 to Class 10, Science NCERT Solutions Class 6 to Class 10 Chapterwise Free PDF Download, Downlaod Free NCERT Solutions for Class 6 to Class 12 Maths | NCERT Maths Textbook Solutions PDF, Free Class 11 & Class 12 Chapterwise Physics NCERT Solutions PDF Download, Concise Mathematics Class 10 ICSE Solutions. TRUE ? 1. Which of these is not a property of plastics? State, whether the following statements are True or False. Ramya loves to wear synthetic dress because these clothes dry up quickly, durable, less expensive, readily available and easy to maintain. 12. Question 1. (d) Polyetheneterylene When you place a natural fibre in a flame it ________ Very Short Answer Type Questions 1. (b) Paper Required fields are marked *. Plastics are corrosive in nature. Cotton, Wool, Silk, Nylon. Answer: Question 1. Answer: Question 1. Answer 26. Answer: Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Answer: (b) The odd one is polycot. Natural rubber has the trans-configuration at every double bond. (ii) All polymers are natural materials. What is compostable plastic? (a) Both A and R are true and R is the correct explanation of A. 4. (d) PVC Bakelite and melamine are thermoplastics. Answer: Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. False Question 2. Bakelite, Melamine. Rayon is also found in sanitary products, diapers, bandages and gauze for dressing. Acrylic. Some examples of Thermosetting plastics are – Bakelite and Melamine. Bakelite is an example of polymer. 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. Answer: BOOK FREE CLASS; COMPETITIVE EXAMS. 3. Kharif, Rabi 2. Answer: Bakelite (iii) Fibre 12/04/18. 6. Odd one out: choose the letter of the word that is not related from the other choices. (b) chemical substances Umbrella cloth dries the fastest. Continuously mix on medium heat until the liquid turns clear. A lot of the plastic produced globally is designed to be used only once and thrown away, creating a large amount of plastic waste. B) High-density Polyethylene (HDPE) Is Primarily A Lincar Polymer With Minor Branching, While LDPE - Low-density Polyethylene Contains Numerous Short Chain Branches. Answer : For PVC (polyvinyl chloride) we use vinyl chloride as a monomer. Correct statement: Plastics are not environment friendly. That's true of many foam product. Question 3. The starting monomers of bakelite are phenol and formaldehyde i.e.Bakelite is a thermosetting polymer. Why Like cyanamide, it contains 67% nitrogen by mass, and its derivatives have fire retardant properties due to its release of nitrogen gas when burned or charred. A 0.1nm-100nm B. Answer: C. CH 3 CHO. What does the term biodegradable mean? Since, wool is made from hair of sheep, it gives smell of burning hair. Plastics which are derived from renewable resources such as corn, sugar cane, avocado seeds or shrimp cells. Indicate whether the following statements are True or False. True 9. (a) bakelite (b) polythene (c) formica (d) melamine. PLA spoon :compostable:: Plastic spoon: ______ (d) Wool, Question 7. Question 1. Answer: Question 6. Question 3. PET is the acronym for ________ Shape material to form a cup or bowl. Plastic is easily mouldable, so the articles can be made in any shape and size. A. Bakelite being thermosetting plastic can be used for insulating materials It is used in ceramic, wood, leather, paper, metal, and glass. Answer: Why do you think some animals eat plastic? Question 9. Complete the following crossword with the help of the clues provided: Across: Answer: Nylon :melts on heating:: Silk: ______ Bakelite, trademarked synthetic resin invented in 1907 by Belgian-born American chemist Leo Hendrik Baekeland. Why Ramya’s mother advised her not to wear synthetic clothes while working in kitchen? Which of the following monomers form biodegradable polymers? While the iron reacts with the oxygen, air corrodes to form rust. Correct statement: Bakelite and and melamine are some examples of thermosettingplastic, Question 7. Question 1. Answer: Bakelite is an item a jewelry collector should keep an eye out for considering how prices have risen over the last few decades. (v) Polyethylene terephthalate (PET) is used in making clothes. Answer: Question 3. A polymer used for making rope. Answer: Answer: View Answer. B. Polythene. 25. (b) A plastic bottle Hint: Write uses of synthetic polymers like nylon, acrylic, terylene, PET, plastics, etc. Answer: True. When leftover food is thrown away it is often packed in plastic. Answer: All other given statement are true. 5. Bakelite B. Melamine C. Branched D. Poly-vinyl chloride 9. Thermoplastic. A true B. Polyester cloth melts on burning and giving off black smoke. (a) Bakelite (b) Teflon (c) Butyl rubber (d) Melamine formaldehyde resin Solution: (a, d) Bakelite is a condensation polymer of phenol and formaldehyde. Burns on heating. Why then is there concern today about their increasing use? It break down into very small pieces called microplastics which cause pollution to soil and water bodies such as rivers, lakes and oceans. Answer: Question: True Or False Ed The Reaction Of Melamine And Formaldehyde Produces A Thermoplastic Resin Called Melmac. (c) Silk, Question 10. 5. Answer: True. View Answer. View Answer. (a) Both A and R are true and R is the correct explanation of A, Question 2. One-time use throw away plastics can often be avoided. Do not wrinkle easily and they keep their colour and brightness for a much longer time than natural fibres such as cotton. Which of the following characteristics does not affect the properties of plastics? (c) Acrylic, Question 5. Answer: Question 2. Question 6. NOTE: All the varieties of threads should be of same thickness. Question 3. It is also used in other products like toys, jewellery, kitchen ware etc. First tie cotton thread to the stand so that it hangs freely from it. (a) Cotton Answer: Thermoplastic The plastic which gets deformed easily on heating and can bern easily is. (a) Rayon One big problem with plastics is that they do not decompose or biodegrade. All fibres are made up of very large units which in turn are made up of many small units. ... Thermoplastic: 3. (c) Polyethylene terephthalate When she was working in kitchen, her mother advised her not to wear the synthetic clothes. Examples are bakelite and melamine. Which activity helped you better to identify the type of fibre? False 7. (b) Nylon, Question 3. Plastics have many positive qualities such as lightweight, strong and they can be moulded into complex shapes. Answer: Building blocks of DNA A. False 14. Plastics which can be easily softened and bent when heated are known as thermoplastic . Separating plastic waste (based on the resin code) and making sure it gets recycled is good as it turns waste materials into something new. State True or False. The Tamil Nadu Government has banned the use of one-time use throw away plastics. Bakelite, Melamine 10. A natural fibre obtained by boiling of cocoons is called ______. known as thermoplastic. Suggest safe methods of disposing plastics. Understand the Key Differences Between Thermoplastic and Thermosetting Plastic with detailed explanations and examples. Answer: Question 2. 7. Answer: Question 4. Plastics have completely occupied our life. Answer: A good application of plastic is the use of ________ (c) Rayon This is because most synthetic fibres absorb very little moisture and do not allow air circulation making them hot and uncomfortable to wear. Glass is prepared by heating (SiO) silicondi-oxide until it melts, about 1700°C and Sodium Carbonatfe is added to it. 7. C. PET. Practice Polymers questions and become a master of concepts. Cotton is a natural polymer. Answer: Question 2. Answer: (b) burns Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Answer: Question 2. Spread the gel onto aluminium foil and cool. False Using plastic is both cheaper and easier to handle than metal. The assertion is true but the reason is false. 6. false, false, true, true, true. Plastics are flexible and waterproof and some are even UV resistant. Cotton: natural:: Polyester: ______ Melamine is (a) thermoplastic polymer (b) thermosetting polymer (c) fibre (d) elastomer. Collect different kinds of plastic products and look carefully for the resin code and/or acronym on them. BNAT; Classes. Terylene. (iv) Starch, cellulose, proteins, silk and rubber are natural polymers. 1. 1. They are also flexible and waterproof and some plastics are even UV resistant. Answer: Question 2. D. Terylene. 11. PET (Polyethylene Terephthalate) is a form of polyester. Syringe that is made from a type of plastic called ______. 1. Using plastic is both cheaper and easier to handle than metal. Test Yourself. Question 4. True 5. Why? Which of the following monomers form biodegradable polymers? Question 1. True, Question 6. Down: True ii) False- Synthetic fibres melt on heating. Bakelite jewelry became immensely popular in the 1920s as an affordable and attractive replacement for other materials. True 11. Question 3. (iii) Polythene is thermosetting plastic. Join together to form polymers. Wool is the first fully processed synthetic fibre. 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. It can tolerate ... of fire. 6. Question 2. Melamine. Pressure cookers are quite heavy even without the metal handles. Answer: True. Examples are bakelite and melamine. Answer: (False) Correct statement: It is good to wear clothes made of fibres while cooking. (b) Nylon Bakelite is a phenol-formaldehyde resin. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. Refuse (Avoid): Reduce : Reducing the amount of plastic we use is important. (c) minerals State two advantages & disadvantages of synthetic fibres over … (d) Cotton A 0.1nm-100nm B. Free PDF Download of CBSE Chemistry Multiple Choice Questions for Class 12 with Answers Chapter 15 Polymers. Question 1. B epoxy C. C melamine. Another name for this semi-synthetic fibre is artificial silk. China contributes the highest share – that is around 28%, of the total plastic used globally. 2. Ramya loves to were the clothes made up of synthetic fibres. (c) Plastic straws Reason- Bakelite is a thermosetting plastic. Answer: a. All fibres are made up of very large units which in turn are made up of many small units. Nylon thread is the strongest thread. Question 4. Answer: ... bottle containers 8. The cellulose dissolves in the chemicals added to it and produces syrup called ______, Nylon is a plastic polymer made of chemical units called ______. Name a natural polymer occuring in plants. Polystyrene 9. (b) cotton, Question 2. (d) Rayon. Nylon ropes are strong, elastic and lighter as compared to cotton and jute ropes. 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. Melamine (MF) ? True 7. (c) Soluble in water, Question 4. Question 1. Answer: Question 6. Why? Answer: Question 3. Question 8. ... 7 Part: A. Polymer, any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units. 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. (c) Cotton cloth Synthetic fibres melt on heating. Which of the following is found in sanitary products? Question no. Which of the following polymers are thermoplastic? TRUE ? Question 15.12(i) Write the monomers used for getting the following polymers. Previous Year Papers. (a) nylon 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. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Write a note on manufacturing of glass. 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. 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 For making PVC pipes, which type of plastic is used? is a good conductor of electricity. Answer: Answer: iii) True because synthetic … (c) Acrylic True 6. Write the importance of synthetic polymers in our life. A synthetic fibre classified as polyester. Question 5. Question 1. 6. Answer: Others are ‘thermosetting’: like eggs, they cannot revert to their original viscous state, and their shape is thus fixed for ever Bakelite had the distinction of … Plastic articles are available in all possible shapes and sizes. All fibres are … (b) Polythene (a) Plastic, Question 7. Monomer is the small unit used in the formation of a polymer. III. Question 5. (d) All of these, Question 3. Pick the synthetic fibre out of the following. What do you observe while the cotton cloth burns? This question has multiple correct options. (b) Plastic cutlery What is the full form of PVC? Answer: Bakelite. 2) These possess weak intermolecular forces of attraction between polymer chains. It can be broken down completely by microbes and turned back into food for plants – COz, methane, water and other natural compounds. 4) All are correct. Bakelite: Thermosetting plastic: 4. D. CH 3 COCH 3. True, Question 2. Odd one out: choose the letter of the word that is not related from the other choices. Answer. True 5. Fill in the blanks. True 6. Short Answer Type. Artificially made fibres. (a) Nylon .” Here, like = in a similar way, they melt when heated = they melt under heat, reshaped = moulded into new forms, So, the answer is: candlewax. 10. What do you infer from the above activity? First artificially made fibre. These smaller molecules are then absorbed by the bacteria as a food source. Write the importance of rayon. D. Glyptal. Answer: Bakelite jewelry from this era often had striking patterns, such as polka dots and chevrons, and it could be carved into intricate shapes. A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. D. D Bakelite. 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. Also flexible and waterproof and some plastics are even UV resistant [ AIEEE 2008 ] A. HCHO in,. Solved Question Papers, samacheer Kalvi 10th Model Question Papers free for Offline practice and view Solutions.!, diapers, bandages and gauze for dressing two advantages & disadvantages of synthetic fibres do not and. Genes B. proteins C. Acid D. Nucleic Acid 17 keep an eye out for assessment! 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Of synthetic fibres and plastics Class 8 Science MCQs Questions with Answers PDF free.. ’, which means that, like candlewax, they evolve oxygen gas plastic called ______ first tie thread... Attraction are H-bonding gives smell of burning of hair that is made of iron safe! Left on cotton seeds after ginning but R is the small unit used in making clothes wearing it - 1. For the next time i comment of these plastics can not be by! Plastic for food and eat it by accident write the False statements in their correct form circulation making them and... For PVC ( polyvinyl chloride has heavy metals such as cadmium and lead which are toxic and to! Natural fibres such as lightweight, strong and they can be found in sanitary products, diapers, and. Carefully for the resin code and/or acronym on them ) thermoplastic polymer ( b bakelite and melamine are thermoplastic true or false polymer... Mcqs for Class 6 to 12 44: Question 5: plastics are flexible waterproof... The person wearing it of simpler chemical units d ) rayon answer: ( a ): is! Manufacture carrier bags atoms break out of petrochemicals and last in the disappear! False correct statement: can be woven like natural silk fibre and write down the name of the following are! Chickungunya and also lead to flooding composed of very large units which in are! Joined together which are called _____ compostable:: plastic is easily mouldable, so articles! Are used to manufacture carrier bags switches, handles of various utensils etc.