(i) A polymer is a chain of many small units joined together which are called _____. Hence these plastics cannot be reprocessed and they can maintain their shape and size even at very high temperatures. The first significant application of plastics began with the development of Bakelite™. Chemistry Questions & Answers for Bank Exams : Which of the following is an example of thermosetting plastic? Can you write the major difference between these two types of plastics? Most of the plastics are biodegradable. T F 1. 4. Question 2. Answer: True. 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 being the first totally synthetic thermosetting plastic. Bakelite was immediately welcomed as a practical and versatile material. 6. false, false, true, true, true. A. Rayon is a natural fibre. Bakelite is an example of polymer. Learn vocabulary, terms, and more with flashcards, games, and other study tools. It cannot be reused. The handles if saucepans are made up if thermos plastic as it is an insulator and prevents heat to flow through it and the electric plugs are also made up of thermos plastic … Reason- Bakelite is a thermosetting plastic. Whereas, the others mentioned are thermoplastics that can be moulded on heating. 1. Answer. TRUE FALSE if the statement agrees with the information if the statement contradicts the information … 22. c) Acrilon is pure wool obtained from sheep. Answer. Question: True Or False. Bakelite contains cross linked molecules which on heating undergo extensive cross linking in moulds and again become infusible. Some plastics behave in a similar way to 1. … 5. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. It is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde. Also, thermosetting plastics such as bakelite are poor conductors of heat. Natural rubber is formed through cationic addition polymerisation. MCQ Questions for Class 6 Science with Answers were prepared based on the latest exam pattern. 10. Which one of the three polymer types is not normally considered to be a plastic: (a) thermoplastics, (b) thermosets, or (c) elastomers ... true or (b) false? We have provided Electricity and Circuits Class 6 Science MCQs Questions with Answers to help … Thermoset plastics cannot be remelted after crosslinking has occurred. If you have any queries regarding Synthetic Fibres and Plastics CBSE Class 8 Science MCQs Multiple Choice Questions with Answers, drop a comment below and we will get back to … Reason: In thermosetting plastics, the polymeric chains are held together by strong covalent bonds. Synthetic fibre do not melt on heating. Thermosetting plastics are bad conductors of … The author says here, “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 … The fabric tery wool is obtained by mixing terylene and wool. Explain why the following are made of thermosetting plastics… Some plastics behave in a similar way to 1 Answer: candlewax.In that they melt under heat and can be moulded into new forms. True. For Any Sample Of Plastic, It Is Generally Too Costly To Count The Number Of Repeating Units On Each Of The Polymer Chains. 25 State whether the following statements are True/False. The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed … … 1 2. Answer: Bakelite. Some are ‘thermoplastic’, which means that, like candlewax, they melt when heated and can then be reshaped. (a). Ans. (a) Melamine (b) Polythene (c ... (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Once set into its original shape, a thermosetting plastic can't be softened and remoulded. Name a synthetic fibre which is polyamide. Also, bakelite is a poor conductor of electricity, hence, it protects us from getting electric shocks. 10. Write full forms of: a) P.V.C. Chapter 10 Quiz Characteristics of Plastic Materials Name: _____ True-False Circle the correct answer. Question 19. T F 3. Can you write the ... Indicate whether the following statements are True or False. Artificial silk is another name for silk. 3. Beyond the questions, you will find the answers along with the location of the answers in the passage and the keywords that help you find out the … TRUE if the statement agrees with the information FALSE if the statement contradicts the information NOT GIVEN if there is no information on this 11. is a good conductor of plastics. b) Plastics are not affected by heat. b) P.E.T. .In that they melt under heat and can be moulded into new forms. Bakelite is the first plastic made from synthetic components. If both assertion and reason are false. Give examples which indicate that nylon fibres are very strong. 12. Reason-Raw materials used to prepare rayon are coal, air and water. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. T F 2. for example : Bakellite , melanin, Formaldehyde Thermoplastic Plastic are kind of plastic which can be moulded … toys, chappals, etc. 2. GENERAL SCIENCE CLASS : VIII Chapter 3 : Synthetic Fibres and Plastics ANSWER KEY Multiple Choice Questions :- Q.1 Bakelite is Answer:-(c) thermosetting plastic Q.2 A number of glucose units make up the polymer Answer:-(c) celluloseQ.3 Polycot is made up of Answer:-(c) polyester and cottonQ.4 Synthetic fibres cause soil … Bakelite was unique because it was the first material to be both entirely 2 in origin, and thermosetting.. 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 20. All Plastics, Thermoplastic Or Thermoset, Will Degrade At Some Temperature? It is risky to wear synthetic clothes while working in the kitchen. Fill in the blanks. Question. There were several reasons for the research into plastics in the nineteenth century, among them the great advances … B) True 14. 3. The Academic passage ‘Bakelite – The Birth of Modern Plastics’ is a reading passage that appeared in an IELTS Test. 2. These MCQ Questions on Synthetic Fibres and Plastics Class 8 with answers pave for a quick revision of the Chapter thereby helping you to enhance … Can you write the major difference between these two types of plastics? Ans: Thermosetting plastics are kind of plastic which once moulded cannot moulded again by heating. Read the passage below and answer questions 1-13. There were several reasons for the research into plastics in the … 7. Answer. (Starch, Nylon, Butadiene, Styrene rubber, Natural rubber, … Hence, it is a thermosetting ploymer. 4. Solving the Synthetic Fibres and Plastics Multiple Choice Questions of Class 8 Science Chapter 3 MCQ can be of extreme help as you will be aware of all the concepts. ... Indicate whether the following statements are True or False. Monomers of nylon 2-nylon 6 are. 2. Explain why plastic containers are favoured for storing food. Start studying True /False Industrial. 11. A) False 13. d) Bakelite is a thermoplastics plastics. If assertion is true but reason is false. Assertion-Rayon is called artificial silk. Thermosetting plastics are those plastics which once moulded, cannot be softened by heating. Bakelite was unique because it was the first material to be both entirely 2 in origin, and thermosetting. The strong bonds between polymers also mean that thermosetting plastics are much more heat resistant than thermosoftening ones. e) P.V.C. Bakelite was unique because it was the first material to be both entirely 2. in origin, and thermosetting. Answer the following questions in short: 1. Differentiate between thermoplastics and thermosetting plastics. Answer: Nylon. Which of two is thermosetting plastic—PVC or bakelite? 13. ... Thermoset plastics harden through a reaction called curing. A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. Melamine, which is used for kitchen surfaces, is an example of a thermosetting plastic (sometimes … (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. D. Bakelite. Question 21. Answer: synthetic Locate. Check the below NCERT MCQ Questions for Class 6 Science Chapter 12 Electricity and Circuits with Answers Pdf free download. True or False State whether the given statements are true or false. Thermoplastics and thermosetting polymers are types of plastic that undergo different production processes and yield a variety of properties depending on the constituent materials and production method. ... Bakelite, a thermosetting plastic, is used to make plugs and switches. Ans: i) Both A and R are true and R is correct explanation of the assertion. If assertion is true but reason is false. Explain why some fibres are called synthetic. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. 73. C. If assertion is true but reason is false. Explain the difference between thermoplastic and thermosetting plastics. True. Modern-day plastic preparation is based on the same principles as that patented in 1907. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Answer: (D) Bakelite. Natural polymers are the products of raw materials found in nature that can be extracted. If both assertion and reason are false… Also write the false statements in their correct form. Question 40. Give two examples of each. Some plastics behave in a similar way to 1 .In that they melt under heat and can be moulded into new forms. Which is a thermosetting plastic? Assertion: Bakelite is a thermosetting plastic. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. True; False, synthetic fibres melt on heating. Thermoplastic materials can be melted, formed, cooled, and then remelted, formed, and cooled again. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Write True or False against the following statements: a) Polyester shrinks on washing. Classify the following compounds into natural and synthetic polymers. Among the thermosetting polymers, the most widely used commercially is which one of the … Handles of frying pans and knobs of pot lids are made of thermosetting resins. glycine and amino caproic acid. Fill in the blanks. Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. True or false? 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