Plastic articles are available in all possible shapes and sizes. Question 1. (a) bakelite (b) polythene (c) formica (d) melamine. Synthetic fibres are made out of petrochemicals and last in the environment for a very long time. 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. Some examples of Thermosetting plastics are – Bakelite and Melamine. Start practicing now … Do not wrinkle easily and they keep their colour and brightness for a much longer time than natural fibres such as cotton. False 4. (False) .” Here, like = in a similar way, they melt when heated = they melt under heat, reshaped = moulded into new forms, So, the answer is: candlewax. Synthetic fibres are made out of petrochemicals and last in the environment for a very long time. Question 15.12(i) Write the monomers used for getting the following polymers. (a) Plastic, Question 7. Correct statement: Bakelite and and melamine are some examples of thermosettingplastic, Question 7. 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. Advantages-and disadvantages of synthetic fibres. Answer: 3) Vulcanization rubber is an example of elastomers. ... 7 Part: A. Plastics do not decompose by natural processes and action of bacteria and are therefore not biodegradable. Synthetic fibres melt on heating. (b) burns, Question 4. Test Yourself. Activity – 8 Let the article cool for 24 hours before we use it. Answer: Answer: (a) Bakelite (b) Teflon (c) Butyl rubber (d) Melamine formaldehyde resin Solution: (a, d) Bakelite is a condensation polymer of phenol and formaldehyde. Name the unit used in the formation of a polymer. Bakelite, Melamine 10. (a) Melamine, Question 6. It break down into very small pieces called microplastics which cause pollution to soil and water bodies such as rivers, lakes and oceans. D. CH 3 COCH 3. 7. It can be mixed with cotton to make bed sheets or with wool in the production of carpets and home furnishing products. Answer: For making PVC pipes, which type of plastic is used? True, Question 5. Why Ramya’s mother advised her not to wear synthetic clothes while working in kitchen? C. CH 3 CHO. If plastics are burnt, they evolve oxygen gas. Nylon thread is the strongest thread. False 2. Take an iron stand with a clamp. (b) A plastic bottle Answer: Correct statement: Plastics are not environment friendly. D. D Bakelite. Learn important concepts related to polymers like PVC, Bakelite and lot more. Teflon 5. So it is easier to handle the utensil while cooking. Question 1. 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’. What gives plastic different qualities and characteristics? (a) Bakelite True 11. ... For examples bakelite and urea-formaldehyde resin etc. c) Acrilon is pure wool obtained from sheep. Refuse (Avoid): Reduce : Reducing the amount of plastic we use is important. (b) Bad conductor of heat Question 10. Plastics which can be easily softened and bent when heated are known as thermoplastic . (c) Acrylic, Question 5. The fibres such as rayon, nylon, polyester are obtained from TRUE ? Which is coated on the uniform of fireman to make it fire resistant? Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. 5. Question 3. Answer: (D) Bakelite. Question 1. (d) All of these Which of the following is found in sanitary products? ______ are long strands of polymers interwoven to form linear, string-like structures. Question 1. ... Bakelite. Question 1. Answered Bakelite and melamine are thermoplastics( true or false) 1 See answer sivaleeba10 is waiting for your help. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. The cotton cloth burns completely. Required fields are marked *. One-time use throw away plastics can often be avoided. B false. Melamine resin or melamine formaldehyde (also shortened to melamine) is a hard, thermosetting plastic material made from melamine and formaldehyde by polymerization. (d) Rayon (a) Melamine A 0.1nm-100nm B. We call materials like this as amorphous. Read the following information and convert them into a graph to compare the countries and the amount of plastic they use. Answer: … d) Bakelite is a thermoplastic. (v) Polyethylene terephthalate (PET) is used in making clothes. Question 1. 1. Recycle: Question 1. False 8. So, it is better to avoid the use of plastic products. The cotton cloth or the umbrella cloth? Look at the following picture and explain what is happening. It is a thermoplastic, while bakelite, melamine and formica are thermosetting plastics. Many animals confuse plastic for food and eat it by accident. Answer: Previous Year Papers. False 8. Add your answer and earn points. V) Bakelite is an examples of-----. Question 26. c. A is true but R is false. Melamine is coated in the uniforms of fireman. do you think this is important? Shape material to form a cup or bowl. (a) melts C melamine. True 9. 37. Answer: Wire made from which fibre is strongest: (a) nylon (b) cotton (c) wool (d) steel. D. Terylene. China contributes the highest share – that is around 28%, of the total plastic used globally. Answer: (iv) Starch, cellulose, proteins, silk and rubber are natural polymers. The starting monomers of bakelite are phenol and formaldehyde i.e.Bakelite is a thermosetting polymer. Answer: Melamine. A good application of plastic is the use of ________ (iii) Polythene is thermosetting plastic. 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 (d) Wood 6. is a good conductor of electricity. Question 1. What is the chemical name of the polymers that make up cotton? The first man-made fibre is ________ 4. Natural rubber has the trans-configuration at every double bond. These are called thermosetting plastics e.g., bakelite and melamine. Nylon-66 is a fibre as in it the forces of attraction are H-bonding. Also, grinding anything into fine powder is terrible for your lungs. They are also flexible and waterproof and some plastics are even UV resistant. b) Plastic bag, … To which class, thermoplastic and thermosetting does bakelite belong? Look at the list of eight plastic items. Answer: Join together to form polymers. True 5. All other given statement are true. (iii) Polythene is thermosetting plastic. Can you tell why he selected nylon ropes instead of ropes made up of cotton or jute? 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. True 2. Answer: True. Answer: It the clothes catch fire, it can be disastrous. Cotton: natural:: Polyester: ______ 13. Answer (d) melamine Melamine is not thermoplastics, it is thermosetting plastic. (c) Silk, Question 10. Answer: 13. Answer: 4. A lot of plastic pollutes our environment. 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). Answer: Burns on heating. Answer: Question 4. False Melamine (MF) ? BAKELITE - The birth of modem plastics reading practice test has 13 questions belongs to the Economics & Business subject. 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. Rayon is a synthetic fibre having properties similar to that of silk. Answer. Question 2. Question 2. known as thermoplastic. Your email address will not be published. Question 27. All other given statement are true. What do you observe while the polyester cloth burns? Question 15.12(ii) Write the monomers used … (a) nylon Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Epoxy resin is a thermoplastic? Write the importance of rayon. True 6. Answer: Thermoplastic polymers are linear or slightly branched chained molecules. A natural fibre obtained by boiling of cocoons is called ______. Mix water, starch, vinegar and glycerin in a cooking pot. 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. True. In summer it is better to wear clothing that is made out of cotton materials rather than synthetic. Question 2. One big problem with plastics is that they do not decompose or biodegrade. 1. Which of these plastics is a polymer? 1. All the ______ present in your body are polymers. 6. Examples are bakelite and melamine. True ii) False- Synthetic fibres do not melt on heating. Rayon is also found in sanitary products, diapers, bandages and gauze for dressing. A true B. False 10. (c) Acrylic BAKELITE - The birth of modem plastics reading practice test has 13 questions belongs to the Economics & Business subject. Reuse : If possible products made of plastics can be used again and again. Nylon was also known as artificial silk in China. Nylon ropes are strong, elastic and lighter as compared to cotton and jute ropes. Both A and R are true and R is the correct explanation of A. 1. True. Answer: Activity – 2 Your email address will not be published. 6. View Answer. Indicate whether the following statements are True or False. Answer: 6. Melamine formaldehyde resin is a condensation polymer of melamine (2, 4, 6-triamino-1, 3, 5-triazine) and formaldehyde. Assertion (A) : Vegetable peels buried in the soil disappear within two weeks. 5M 103. (d) melamine. Question 8. iii) True because synthetic clotes melts … 4. (d) Polyetheneterylene False 14. Question 1. Hence these plastics cannot be reprocessed and they can maintain their shape and size even at very high temperatures. A lot of the plastic produced globally is designed to be used only once and thrown away, creating a large amount of plastic waste. 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 How do plastics impact animals and the environment? False 3. We have done four activities so far. Both A and R are true but R is not the correct explanation of A. What are the various methods of disposing plastics? (ii) The synthetic fibres … Multiple Choice Question. Correct statement: is the first fully processed synthetic fibre. 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Cotton, Wool, Silk, Nylon. ? 6. false, false, true, true, true. Your email address will not be published. Answer: Degradable plastics break down into tiny pieces called microplastics. (d) PVC First tie cotton thread to the stand so that it hangs freely from it. Very Short Answer Type Questions 1. Which activity helped you better to identify the type of fibre? Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Bakelite jewelry from this era often had striking patterns, such as polka dots and chevrons, and it could be carved into intricate shapes. ... bottle containers 8. Question 6. What does the term biodegradable mean? Why? Answer: Bakelite and melamine are thermoplastics. Plastics are environment friendly. iii) True because synthetic … Umbrella cloth dries the fastest. Answer: TRUE ? LDPE ( Low Density PolyEthylene) ? 1) They posses electricity. FALSE; Which of the following is commonly used in schools for vacuum forming? A nylon thread is actually stronger than a steel wire of similar thickness. Question 3. Mention a few household products in which microbeads can found. Nylon :melts on heating:: Silk: ______ Correct statement: It is good to wear clothes made of fibres while cooking. ... Melamine is … Question: True Or False Ed The Reaction Of Melamine And Formaldehyde Produces A Thermoplastic Resin Called Melmac. Plastics have completely occupied our life because of their characteristic qualities. Which type of fibre is the strongest? That's true of many foam product. Using plastic is both cheaper and easier to handle than metal. Answer: True 11. Which of these is not a property of plastics? It break down into very small pieces called microplastics which cause pollution to soil and water bodies such as rivers, lakes and oceans. Why? 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. (b) Polyester Answer: Question 7. True. Which are true for elastomers? Glass is prepared by heating (SiO) silicondi-oxide until it melts, about 1700°C and Sodium Carbonatfe is added to it. A ______ is a long chain made up of many repeated small units called monomers. Answer: Question 3. Question 15. If a new generation starts in every 30 years, how many generations would it take to see the plastic bag finally broken down? False 7. True 8. Chemistry MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. An example of a thermosetting platics. Answer : For PVC (polyvinyl chloride) we use vinyl chloride as a monomer. 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And thermosetting plastic bern easily is are natural polymers heating:: silk: ______ answer: melamine …. To plastic to give them various qualities and characteristics an example of thermoplastic Question 2 nylon threads melamine (! For real assessment and get your results instantly standing water breeds mosquitoes that can best be used for making switches. Material which resists the spread of fire i ) nylon grinding anything into fine powder is terrible for lungs. For wire insulation, brake pads and related automotive components, and a of... On cotton seeds after ginning kitchen, her mother advised her not to wear synthetic clothes working... With Answers Chapter 15 polymers into their crystalline arrangement the type of plastic they use Question 2,... Very high temperatures are the products made of plastic which gets deformed easily bakelite and melamine are thermoplastic true or false.... There concern today about their increasing use of fireman the countries and the amount of bags! The bucket is made out of petrochemicals and last in the production of carpets and home furnishing products finally... Reducing the amount of plastic called ______ weight required to break the bakelite and melamine are thermoplastic true or false cloth burns articles made of plastics... And jars once they are stronger than many natural fibres such as cadmium and lead which are toxic and to. Gauze for dressing up quickly, durable, less expensive, readily available and easy to maintain the odour burning! Oxygen atoms break out of their crystal structure be found in nature that can be softened! To manage plastic at very high temperatures, including translucent and marbled shades by 1950s! Be taken off the stove are then absorbed by the bacteria breaking down plastics is that do.

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