... Bakelite, a thermosetting plastic, is used to make plugs and switches. 10. Handles of frying pans and knobs of pot lids are made of thermosetting resins. The fabric tery wool is obtained by mixing terylene and wool. Chapter 10 Quiz Characteristics of Plastic Materials Name: _____ True-False Circle the correct answer. Differentiate between thermoplastics and thermosetting plastics. A plastic substance which once moulded into a shape cannot be melted or made soft on reheating is said to be a thermosetting plastic. There were several reasons for the research into plastics in the nineteenth century, among them the great advances … True; False, synthetic fibres melt on heating. If assertion is true but reason is false. Bakelite is an example of polymer. Read the passage below and answer questions 1-13. Explain the difference between thermoplastic and thermosetting plastics. C. If assertion is true but reason is false. 13. Reason: In thermosetting plastics, the polymeric chains are held together by strong covalent bonds. The Academic passage ‘Bakelite – The Birth of Modern Plastics’ is a reading passage that appeared in an IELTS Test. If both assertion and reason are false. 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. Natural rubber is formed through cationic addition polymerisation. We have provided Electricity and Circuits Class 6 Science MCQs Questions with Answers to help … Question 21. Also, bakelite is a poor conductor of electricity, hence, it protects us from getting electric shocks. Some are ‘thermoplastic’, which means that, like candlewax, they melt when heated and can then be reshaped. Modern-day plastic preparation is based on the same principles as that patented in 1907. All Plastics, Thermoplastic Or Thermoset, Will Degrade At Some Temperature? is a good conductor of plastics. toys, chappals, etc. 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 … 12. (Starch, Nylon, Butadiene, Styrene rubber, Natural rubber, … Bakelite was unique because it was the first material to be both entirely 2. in origin, and thermosetting. b) Plastics are not affected by heat. Bakelite contains cross linked molecules which on heating undergo extensive cross linking in moulds and again become infusible. Also write the false statements in their correct form. True. 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. Bakelite was unique because it was the first material to be both entirely 2 in origin, and thermosetting.. Explain why the following are made of thermosetting plastics… Natural polymers are the products of raw materials found in nature that can be extracted. glycine and amino caproic acid. Classify the following compounds into natural and synthetic polymers. Among the thermosetting polymers, the most widely used commercially is which one of the … Give two examples of each. 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. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. 73. True or False State whether the given statements are true or false. It cannot be reused. (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 the following questions in short: 1. It is risky to wear synthetic clothes while working in the kitchen. TRUE FALSE if the statement agrees with the information if the statement contradicts the information … Some plastics behave in a similar way to 1 Answer: candlewax.In that they melt under heat and can be moulded into new forms. 4. Explain why plastic containers are favoured for storing food. Some plastics behave in a similar way to 1 .In that they melt under heat and can be moulded into new forms. Which of two is thermosetting plastic—PVC or bakelite? Thermosetting plastics are bad conductors of … 5. 10. Question 2. 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- Bakelite is a thermosetting plastic. Assertion: Bakelite is a thermosetting plastic. Reason-Raw materials used to prepare rayon are coal, air and water. Question: True Or False. Check the below NCERT MCQ Questions for Class 6 Science Chapter 12 Electricity and Circuits with Answers Pdf free download. 2. … Hence these plastics cannot be reprocessed and they can maintain their shape and size even at very high temperatures. Thermoplastic materials can be melted, formed, cooled, and then remelted, formed, and cooled again. If both assertion and reason are false… (i) A polymer is a chain of many small units joined together which are called _____. Can you write the ... Indicate whether the following statements are True or False. Write full forms of: a) P.V.C. ... Indicate whether the following statements are True or False. T F 3. ... Thermoset plastics harden through a reaction called curing. (a) Melamine (b) Polythene (c ... (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. c) Acrilon is pure wool obtained from sheep. The strong bonds between polymers also mean that thermosetting plastics are much more heat resistant than thermosoftening ones. 6. false, false, true, true, true. 3. Bakelite was unique because it was the first material to be both entirely 2 in origin, and thermosetting. MCQ Questions for Class 6 Science with Answers were prepared based on the latest exam pattern. .In that they melt under heat and can be moulded into new forms. Answer: True. For Any Sample Of Plastic, It Is Generally Too Costly To Count The Number Of Repeating Units On Each Of The Polymer Chains. Solution: Bakelite is a thermosetting plastic, which means it retains its shape even at high temperatures. Write True or False against the following statements: a) Polyester shrinks on washing. Question. 2. Melamine, which is used for kitchen surfaces, is an example of a thermosetting plastic (sometimes … Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Bakelite is the first plastic made from synthetic components. Whereas, the others mentioned are thermoplastics that can be moulded on heating. Answer: Nylon. Give examples which indicate that nylon fibres are very strong. 7. D. Bakelite. (a). Can you write the major difference between these two types of plastics? 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. Chemistry Questions & Answers for Bank Exams : Which of the following is an example of thermosetting plastic? T F 1. Artificial silk is another name for silk. for example : Bakellite , melanin, Formaldehyde Thermoplastic Plastic are kind of plastic which can be moulded … 2. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Thermoset plastics cannot be remelted after crosslinking has occurred. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Fill in the blanks. 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. The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed … Hence, it is a thermosetting ploymer. Answer: (D) Bakelite. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. T F 2. Question 40. True. Assertion-Rayon is called artificial silk. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Answer. Monomers of nylon 2-nylon 6 are. e) P.V.C. B) True 14. 25 State whether the following statements are True/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. 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 … 4. The first significant application of plastics began with the development of Bakelite™. Some plastics behave in a similar way to 1. It is a thermosetting phenol formaldehyde resin, formed from a condensation reaction of phenol with formaldehyde. True or false? Bakelite was immediately welcomed as a practical and versatile material. Answer: Bakelite. Once set into its original shape, a thermosetting plastic can't be softened and remoulded. Answer. 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 … 3. Synthetic fibre do not melt on heating. 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 … If assertion is true but reason is false. Most of the plastics are biodegradable. Start studying True /False Industrial. A. d) Bakelite is a thermoplastics plastics. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. 1. Thermosetting plastics are those plastics which once moulded, cannot be softened by heating. 11. Answer: synthetic Locate. Name a synthetic fibre which is polyamide. 22. 1 2. There were several reasons for the research into plastics in the … Ans. Can you write the major difference between these two types of plastics? Fill in the blanks. Ans: Thermosetting plastics are kind of plastic which once moulded cannot moulded again 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 … Rayon is a natural fibre. Ans: i) Both A and R are true and R is correct explanation of the assertion. 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 … 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? Explain why some fibres are called synthetic. Also, thermosetting plastics such as bakelite are poor conductors of heat. Answer. Which is a thermosetting plastic? … Question 20. A) False 13. Costly to Count the Number of Repeating Units on Each of the assertion reprocessed and they can their... Hence, it protects us from getting electric shocks of thermosetting resins products of raw found. Knobs of pot lids are made of thermosetting plastics… Reason- bakelite is a thermoplastic and used... Entirely 2. in origin, and more with flashcards, games, and other study.! Into new forms kind of plastic which once moulded, can not be softened by heating plastics began with development! 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