Choose the correct option. 1. A chain of small chemical units combined to form a large single unit is called ______

Choose the correct option.
1. A chain of small chemical units combined to form a large single unit is called ______ a) Polymer b) Poly c) Polythene d) None of the above 2. Polythene and PVC are examples of a) Bio degradable substance b) Thermosetting plastics c) Thermoplastics d) Rayon 3. Plastics which when moulded once, cannot be softened by heating. Such plastics are called __ a) Polythene b) Thermoplastics c) Polyster d) Thermosetting plastics 4. Polycot is made by mixing two types of fibres namely a) Silk + Cotton b) Polythene + cotton c) Silk + Polyester d) Polyester + Cotton 5. The 4 R Principle is a) Reduce, Reuse, Recycle, Recover b) Remember, reduce, Recycle, Rejoice c) Repeat, Rejoice, recycle, reduce d) None of the above 6. _____________ is an example of natural polymer a) Rayon b) Cellulose c) Nylon d) All of the above 7. Which of the following is Non-biodegradable ? a) Woolen clothes b) Plastic bag, c) Cotton cloth d) Wood 8. Bakelite and Melamine are examples of a) Thermosetting plastics b) Silk c) Nylon d) Rayon 9. Fire proof plastic uniform worn by fire fighters has a coating of _____ to make it fire resistant. a) Nylon b) Rayon c) Melamine plasticd) silk The coating on modern non- stick cookware and electric iron is of a) Terrycot b) Rayon c) Polyester d) Teflon​

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