1. The individual polymer unit of cotton is: Answer: - TopicsExpress



          

1. The individual polymer unit of cotton is: Answer: Cellulose 2. The fibre that is obtained by chemical treatment of wood pulp is: Answer: Rayon or artificial silk 3. Which synthetic fibre used coal, water and air as its raw materials? Answer: Nylon 4. Parachutes and ropes for rock climbing are made out of the artificial fibre called ......... Answer: Nylon 5. What is polycot? Answer: Mixture of polyester and cotton 6. Which polymer form is used widely for making bottles, utensils and films? Answer: PET (polyethylene Terephthalate) 7. Plastics which get deformed easily on heating and can be bent are known as ......... Answer: Thermoplastics 8. Once moulded, some plastics cannot be softened by heating. Such plastics are termed as ......... Answer: Thermosetting plastics 9. Bakelite and Melamine are examples of ......... plastic. Answer: Thermosetting plastic 10. The thermosetting plastic used for making floor tiles is ......... Answer: Melamine 11. Which is the plastic used for making nonstick coating on cookware? Answer: Teflon 12. Uniforms of fireman have been coated with a plastic so as to make them flame resistant. Which is the plastic form? Answer: Melamine 13. What is the “4R” principle associated with the sustainable use of plastics? Answer: Reduce, Reuse, Recycle and Remove 14. The property of metals by which they can be beaten into thin sheets are called ......... Answer: Malleability 15. What is ductility? Answer: Ability of metals to be drawn into wires 16. Which are the common metals those can be cut into pieces with a knife? Answer: Sodium and Potassium 17. Why is the metal Sodium stored in kerosene? Answer: Because it reacts vigorously with oxygen and water 18. Which non-metal, that catches fire if exposed to air, is kept under water? Answer: Phosphorus 19. Which element is the main constituent of coal? Answer: Carbon 20. The slow process of conversion of dead vegetation into coal is called ......... Answer: Carbonisation
Posted on: Fri, 08 Nov 2013 09:07:02 +0000

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