We have provided Electricity and Circuits Class 6 Science MCQs Questions with Answers to help … Answer. Thermosetting plastics are bad conductors of … Question 40. Assertion: Bakelite is a thermosetting plastic. If both assertion and reason are false… Reason-Raw materials used to prepare rayon are coal, air and water. Classify the following compounds into natural and synthetic polymers. Fill in the blanks. Answer: True. 2. Bakelite was unique because it was the first material to be both entirely 2 in origin, and thermosetting.. 4. Answer the following questions in short: 1. C. If assertion is true but reason is false. (a). Question 2. Differentiate between thermoplastics and thermosetting plastics. Answer: (D) Bakelite. Ans: i) Both A and R are true and R is correct explanation of the assertion. 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. T F 3. Which is a thermosetting plastic? Can you write the major difference between these two types of plastics? True or false? Question 19. 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 … Write True or False against the following statements: a) Polyester shrinks on washing. 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. Reason: In thermosetting plastics, the polymeric chains are held together by strong covalent bonds. Hence these plastics cannot be reprocessed and they can maintain their shape and size even at very high temperatures. 4. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Some plastics behave in a similar way to 1. 6. false, false, true, true, true. 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? It is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde. Answer. Answer: Nylon. A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. T F 1. A) False 13. Chapter 10 Quiz Characteristics of Plastic Materials Name: _____ True-False Circle the correct answer. Also write the false statements in their correct form. Bakelite is the first plastic made from synthetic components. 73. Can you write the ... Indicate whether the following statements are True or False. … Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. e) P.V.C. c) Acrilon is pure wool obtained from sheep. Also, thermosetting plastics such as bakelite are poor conductors of heat. 1 2. (Starch, Nylon, Butadiene, Styrene rubber, Natural rubber, … 7. Some plastics behave in a similar way to 1 Answer: candlewax.In that they melt under heat and can be moulded into new forms. For Any Sample Of Plastic, It Is Generally Too Costly To Count The Number Of Repeating Units On Each Of The Polymer Chains. Thermoplastic materials can be melted, formed, cooled, and then remelted, formed, and cooled again. If both assertion and reason are false. Question: True Or False. 13. If assertion is true but reason is false. Handles of frying pans and knobs of pot lids are made of thermosetting resins. (a) Melamine (b) Polythene (c ... (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. Modern-day plastic preparation is based on the same principles as that patented in 1907. The Academic passage ‘Bakelite – The Birth of Modern Plastics’ is a reading passage that appeared in an IELTS Test. toys, chappals, etc. There were several reasons for the research into plastics in the … … The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed … Check the below NCERT MCQ Questions for Class 6 Science Chapter 12 Electricity and Circuits with Answers Pdf free download. PVC (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. 10. 10. Natural rubber is formed through cationic addition polymerisation. Once set into its original shape, a thermosetting plastic can't be softened and remoulded. The strong bonds between polymers also mean that thermosetting plastics are much more heat resistant than thermosoftening ones. The fabric tery wool is obtained by mixing terylene and wool. Whereas, the others mentioned are thermoplastics that can be moulded on heating. 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 … 11. Most of the plastics are biodegradable. 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. Question. D. Bakelite. 12. Bakelite is an example of polymer. 2. 3. Reason- Bakelite is a thermosetting plastic. Rayon is a natural fibre. 2. 1. 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 … Can you write the major difference between these two types of plastics? Give examples which indicate that nylon fibres are very strong. 3. Learn vocabulary, terms, and more with flashcards, games, and other study tools. If assertion is true but reason is false. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Assertion-Rayon is called artificial silk. glycine and amino caproic acid. Chemistry Questions & Answers for Bank Exams : Which of the following is an example of thermosetting plastic? TRUE FALSE if the statement agrees with the information if the statement contradicts the information … Explain why plastic containers are favoured for storing food. Ans. B) True 14. Ans: Thermosetting plastics are kind of plastic which once moulded cannot moulded again by heating. Some plastics behave in a similar way to 1 .In that they melt under heat and can be moulded into new forms. True. Fill in the blanks. 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. Which of two is thermosetting plastic—PVC or bakelite? The first significant application of plastics began with the development of Bakelite™. ... Bakelite, a thermosetting plastic, is used to make plugs and switches. Bakelite was unique because it was the first material to be both entirely 2 in origin, and thermosetting. ... Indicate whether the following statements are True or False. Melamine, which is used for kitchen surfaces, is an example of a thermosetting plastic (sometimes … True; False, synthetic fibres melt on heating. It cannot be reused. (i) A polymer is a chain of many small units joined together which are called _____. for example : Bakellite , melanin, Formaldehyde Thermoplastic Plastic are kind of plastic which can be moulded … d) Bakelite is a thermoplastics plastics. Synthetic fibre do not melt on heating. b) Plastics are not affected by heat. Some are ‘thermoplastic’, which means that, like candlewax, they melt when heated and can then be reshaped. 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. Start studying True /False Industrial. Hence, it is a thermosetting ploymer. Write full forms of: a) P.V.C. 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. Explain the difference between thermoplastic and thermosetting plastics. Bakelite contains cross linked molecules which on heating undergo extensive cross linking in moulds and again become infusible. .In that they melt under heat and can be moulded into new forms. True or False State whether the given statements are true or false. Also, bakelite is a poor conductor of electricity, hence, it protects us from getting electric shocks. Answer: Bakelite. Monomers of nylon 2-nylon 6 are. 22. Name a synthetic fibre which is polyamide. ... Thermoset plastics harden through a reaction called curing. A. Bakelite was immediately welcomed as a practical and versatile material. All Plastics, Thermoplastic Or Thermoset, Will Degrade At Some Temperature? Answer: synthetic Locate. True. 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 … 5. Read the passage below and answer questions 1-13. Natural polymers are the products of raw materials found in nature that can be extracted. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Bakelite was unique because it was the first material to be both entirely 2. in origin, and thermosetting. T F 2. There were several reasons for the research into plastics in the nineteenth century, among them the great advances … 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. (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. 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 … Give two examples of each. b) P.E.T. Explain why the following are made of thermosetting plastics… 25 State whether the following statements are True/False. Artificial silk is another name for silk. It is risky to wear synthetic clothes while working in the kitchen. Explain why some fibres are called synthetic. 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 … Question 21. Thermoset plastics cannot be remelted after crosslinking has occurred. MCQ Questions for Class 6 Science with Answers were prepared based on the latest exam pattern. Answer. 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