Thermosetting plastic once set do not soften on heating. (c) polvthene Question 16. Contact us for your Swiss made TCU! (a) thermoplastic Plastics which gets deformed easily on heating and can be bent easily are known as …………………, Question 2. Question 15. (d) polyester and wool. (c) polythene ? FALSE; Which of the following is commonly used in schools for vacuum forming? (c) cow-dung Odd one out: choose the letter of the word that is not related from the other choices. A synthetic fibre resembling wool is: Answer: True. Question 9. Differentiate between thermoplastic and thermosetting plastics. (d) all of these, (d) all of these Plastics are man-made materials. Polyester is a synthetic fibrous material. Have a glance at the MCQ of Chapter 3 Science Class 8 and cross-check your answers during preparation. FALSE; Plastic is suitable for building large and heavy structures. Which of the following can be recycled: Question 17. Question 2. (b)cotton Explain why plastic containers are favoured for storing food. (c) terylene Thermoset vs thermoplastic, and Bakelite. Which of the following garbage is biodegradable: (c) polythene and wool Explain the difference between thermoplastic and thermosetting plastics. (a) corrosive The terms thermoplastic and thermoset stand for how a material is or can be processed under a changed temperature [1]. Question 22. Question 5. Question 4. (b) jute FALSE; PVC is a thermoplastic. HIPS ? We should wear synthetic clothes while working in the kitchen or in a laboratory. (c) polyester (a) nylon False 2. (b) Reuse Question 6. [CBSE AIPMT 2012] A. Question 26. Question 14. (c) polyester Why don't libraries smell like bookstores? (d) PET. (b) cotton (b) polyethylene (b) nylon Short Answer Type. (c) polythene and wool A. Cellulose B. Starch C. Rubber D. DNA 15. 14. (c) teflon It cannot be reused. (b) teflon Contact our team today T: 01933 442623 E: info@tool-temp.net W: www.tool-temp.net Inc. Live Chat Continuous temperature & (flow regulation) with accuracy to 1/10th of a ℃ Question 13. Write the importance of synthetic polymers in our life. (c) hining Synthetic fibres are moth and insect resistant. (i) chemical molecules formed naturally like silk, cotton etc. Most polymers used in 3D printing applications are thermoplastic. State whether the statements given below are True or False. (d) ball point pens. Bakelite is a thermosetting plastic. (a) glucose (iv) simple chemical molecules made of single unit. Which of the following is used to make non-stick cookwares: (a) nylon (d) nylon. (b) therniosetting plastic It is good to wear clothes made of synthetic fibres while cooking. Question 3. Which of the following is used for making parachutes and stockings: (d) polythene. The simplest molecule of a polymer is called …………………. 2. Melamine is not thermoplastics, it is thermosetting plastic. (iii) the process of formation of polymers by synthesis of monomers. What precautions should you use when working in an area with a large number Question 8. Nylon is used for making parachutes and stockings. 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 Electric plugs are made up ………………… plastics. (b) thermoplastic ? Question 14. 3. A material which is not easily decomposed by natural processes is termed as …………………. 13. Question 18. Rubber and wood are good conductors of electricity. (b) Recycle (d) rubber, (b) cellulose (a) plastic toys Answer: True. The biggest difference between a thermoplastic and thermoset is that a thermoplastic can be recycled. FALSE; HDPE is a tough plastic used for making toys. (d) all of these. (c) nylon Fabrics made of polyester do not wrinkle easily. Which of the following is not biodegradable: Cellulose is made up of a large number of ………………… units. Bristles of tooth brush are made from: False 6. Question 4. Question 24. (c) cotton (d) polyester and wool. Question 15. Wood is a natural substance where as plastics, cement and glass are man-made substances. I thought that thermosets were "set solid" by a chemical reaction that was irreversible. Cotton clothes are more comfortable during hot/humid weather. How long will the footprints on the moon last? (b) polyester and cotton Answer: 1. (b) nylon Can you write the major difference between these two types of plastics? Aluminium foil is not biodegradable. Cellulose is made up of a large number of glucose units. 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. (c) acrylic Which of the following is not thermoplastics: Students can solve these Synthetic Fibres and Plastics Class 8 MCQs Questions with Answers and assess their preparation level. Who is the longest reigning WWE Champion of all time? Cotton is natural polymer whereas rayon, polyester and polythene are synthetic polymers. 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 subject knowledge. Question 20. When did organ music become associated with baseball? Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. TRUE ? Cotton fibre burns readily with smell of burning paper. (a) broken plastics things Fill in the blanks. (c) telephone instruments Hint: Write uses of synthetic polymers like nylon, acrylic, terylene, PET, plastics, etc. True or False. (a) rayon (d) melamine. (b) teflon Question 21. True 7. 11. 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