MCQ Questions for Class 6 Science with Answers were prepared based on the latest exam pattern. D. CH 3 COCH 3. Which one of the following statements is not true? ... Proteins and PVC. 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. State whether the given statement is true or false. Polyesters contain ester linkages. Bakelite is used in making switches, handles of cooker, frying pans, combs etc. 7. V) Bakelite is an examples of-----. Which one of the three polymer types is not normally considered to be a plastic: (a) thermoplastics, ... true or (b) false? Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Start studying True /False Industrial. Rayon synthesised for the first time in England. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Curing is induced by heat or suitable radiation and may be promoted by high pressure, or mixing with a catalyst.Heat is not necessarily to be applied externally. These solutions for Man Made Materials are extremely popular among Class 8 students for Science Man Made Materials Solutions come handy for quickly completing your homework and preparing for exams. They are also called macromolecules. The most commonly and widely used nitrogenous fertilizer in Pakistan is: a) Nitrolin Whereas, polythene is a thermoplastic polymer i.e. known as thermoplastic. These are the condensation polymers of diacids and diols. The main physical difference is how they respond to high temperatures. Biology, 03.07.2020 20:01, alexis9263 Give differences between thermoplastic and thermoplastic plastic ? View Answer. (a). hema9950 hema9950 Answer: True , Bakelite and melamine are example of thermoplastic. Urea is an excellent nitrogenous direr which contains nitrogen about: a) 36% b) 47% c) 80 % d) 60% 4. Artificial silk is another name for silk. Say TRUE or FALSE : Chloroprene is an addition polymer of Neoprene. At the department of Polymer Engineering, we have developed a new class of high temperature thermoplastics substrates for circuit boards, such as PEI, PES and PPS, which show a number of advantages compared to FR4 laminates: Inherent flame resistance Play this game to review Chemical Bonds. Question 6. ... is an example of a hard good manufactured product. Answers: 1, question: The code that follows shows an example of branching on an enumerated type value in a switch statement. Check the below NCERT MCQ Questions for Class 6 Science Chapter 12 Electricity and Circuits with Answers Pdf free download. Physics is about an applied mathematics. Ask your interesting physics related questions for free. once they are moulded and harden on cooling, they cannot be softened again. (v) Polyethylene terephthalate (PET) is used in making clothes. State True or False (i) Nylon is a polymer. (ii) All polymers are natural materials. (iii) Polythene is thermosetting plastic. Bakelite is an example of thermoplastic. Bakelite – (iii) Fibre. Which one of the following is a thermoplastic a) Bakelite b)Acrylic c) Melamine d)PVC 2. Question 5. Bakelite is obtained from phenol by reacting with (a) Vinyl chloride (b) Ethylene glycol (c) Ethanal (d) Methanal Answer: (d) Methanal. Explanation: It is a rigid type of plastic which is highly resistant to heat. Using plastic is both cheaper and easier to handle than metal. Question 5. PVC – (ii) Thermosetting plastic . PE's having high impact strength and ductility, which results in holding up to tension, makes it a great choice for garbage bags. State, whether the following statements are True or False. Thermoplastic The plastic which gets deformed easily on heating and can bern easily is. 5M 103. Answer: False. C. CH 3 CHO. Once formed, it can be heated and reformed over and over again Which of the following is not thermoplastics: (a) acrylic (b) polyethylene (c) polystyrene (d) melamine. An important example of this class of substrates is the low cost epoxy-based FR4 laminate. 5. 5M 104. Play this game to review English. Question 3. Statement: The articles made of thermoplastics can be recycled whereas the articles made of thermosetting plastics cannot be recycled. Examples – Polythene and polyvinyl chloride(PVC) Thermosetting PlasticThe plastic which getsmoulded once, cannot besoftened on heating is called thermosetting plastic. Urea, Ammonia nitrate and ammonium sulphate are examples of: a) Nitrogenous Fertilizers b) Potassic Fertilizers c) Phosphatic Fertilizers d) None of these 3. 2. Answer. Question 5. 2. Quizlet flashcards, activities and games help you improve your grades. 13. ... Thermoplastic materials can be melted formed cooled and then remelted formed, and cooled again. Melting temperature increases with higher degree of crystallinity. Polyester fibres are used for making hand knit sweaters. Alkali or acid catalyst is used for the polymerisation. (True or False) The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. Question 6. Answer. (b). 9 and Ch. Terylene fibre is very much durable and crease-resistant. Of the three polymer types, which one is the most important commercially: (a) thermoplastics, (b) thermosets, or (c) elastomers? Answered Bakelite and melamine are thermoplastics( true or false) 1 See answer sivaleeba10 is waiting for your help. Polymers has high molecular mass. they can be softened by heating only once i.e. [TRUE/FALSE] Following are the two important polyester polymers:(i) Dacron or Terylene : When ethylene glycol (ethane–1, 2–diol) is condensed with terephthalic acid (benzene-1, 4-dicarboxylic acid) at 423–473 K, terylene is obtained. Bakelite is obtained from phenol by reacting with [AIEEE 2008] A. HCHO. True or False State whether the given statements are true or false. 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. Polyester is the strongest synthetic fibre. softening and hardening can be repeated again and again. Examples – B akelite and melamine. Nylon was made in 1931. Application example: Due to favorable Mechanical properties of different PE's, such as strength, rigidity, hardness, it is good for use in drain pipe. MSE 2001 Exam 4 (Ch. Examples are bakelite and melamine. [true/false] Rain water is the purest form of natural water. Examples - Bakelite, Urea-formaldelyde resins • Addition Polymerisation or Chain Growth Polymerisation: Addition polymerisation is called chain growth polymerisation because it takes place through stages leading to increase in chain length and each stage produces reactive intermediates for use in next stage of the growth of chain. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. 3. Pressure cookers are quite heavy even without the metal handles. III. Bakelite is an example of the thermosetting plastic. The reason why a plastic cup placed inadvertently near the fire becomes deformed is that it is made of a thermoplastic resin. Learn and free practice physics general knowledge (gk) objective type questions & answers with explanation for all competitve exams and quiz. How states have been keeping small business afloat. Polymers make up many of the materials in living organisms, and they constitute the basis of certain minerals and human-made materials, such as paper and plastics. II. Differentiate between thermoplastic and thermosetting plastic (with 2 points each and one example - 19754021 Bakelite is a thermosetting polymer i.e. Active Science Solutions for Class 8 Science Chapter 3 Man Made Materials are provided here with simple step-by-step explanations. Barkley: Kyrie is not 'the smartest guy in the room' Fla. scientist vows to speak COVID-19 'truth to power' MEDIUM IV. 6. Some examples of polymers are polythene, bakelite, rubber, etc. The material similar to silk in appearance is (a) Nylon (b) Rayon ... Thermoplastic . It is different from thermoplastic resins which are known to be viscous liquids when heated to their melting points. (iv) Starch, cellulose, proteins, silk and rubber are natural polymers. Polymer, any of a class of natural or synthetic substances composed of very large molecules that are multiples of simpler chemical units. Nylon-66 is an example of elastomer. Why are cells called structural and functional units of living organisms? B (CH 2 OH) 2. Small molecules that make up larger molecules. The part of the earth which supports life is known as ... Give an example. Answer. Add your answer and earn points. Physics is a branch of science which studies the properties of matter, energy and their mutual relationship. Answer ... bakelite Bakelite is a thermosetting plastic. ... State whether the following statements are True or False: Question 1. ,'True Also, write false statements in their correct form. 3. False. 5. 4. Rayon is a natural fibre. Bakelite is formed by the reaction of phenol and formaldehyde (methanal). 1. A thermosetting polymer, resin, or plastic, often called a thermoset, is a polymer that is irreversibly hardened by curing from a soft solid or viscous liquid prepolymer or resin. 10) study guide by gadler95 includes 67 questions covering vocabulary, terms and more. ... Indicate whether the following statements are True or False. State, whether the following statements are True or False. Physics Questions & Answers for AIEEE,Bank Exams,CAT,GATE, Analyst,Bank Clerk,Bank PO : Electromagnetic waves are transverse in nature is evident by Of the following which one is classified as polyester polymer? Bakelite and melamine are thermoplastics( true or false) - 14613642 ... School +5 pts. Recall that enumerated types in C are simply a way to introduce a set of names having associated integer values By default, the values assigned to the names go from zero upward. 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