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