Question

Fill in the blanks – 1. ----------made from both synthetic and natural fibers. 2. ---------- is the another name of lycra. 3. ---------- fibre is also called artificial silk. 4. Electrical switches are made of ----------. 5. The process of combining monomers to form a polymer is called-------. 6. Rayon is a fiber regenerated from---------. 7. ------------ is often used are substitute for wool. 8. ------------ is used as a coating on the surface of non- stick frying pans. 9. -----------synthetic fiber is commonly used to make strong ropes. 10. ---------- are long- chain polymers made by linking of several ester units. 11. ----------plastics are set into a particular shape cannot be remolded. 12. ---------- is the most common source for synthetic fibers. 13. Plastics are an example of -----------. 14. Themocol is made from--------- plastic material. 15. Plastics are polymers that can be --------- and ---------- into any desired shape.

Answer 1

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1. Fabric/Cloth made from both synthetic and natural fibers. 2. elastane is the another name of lycra. 3. Rayon fibre is also called artificial silk. 4. Electrical switches are made of PVC(Polyvinyl chloride) 5. The process of combining monomers to form a polymer is called polymerisation 6. Rayon is a fiber regenerated from cellulose (wood pulp) 7. Arcylic Fibre is often used are substitute for wool. 8. (PTFE) is used as a coating on the surface of non- stick frying pans. 9. Nylon synthetic fiber is commonly used to make strong ropes. 10. Polyester are long- chain polymers made by linking of several ester units. 11. Thermosetting plastics are set into a particular shape cannot be remolded. 12. Petroleum is the most common source for synthetic fibers. 13. Plastics are an example of Non-biodegradable 14. Themocol is made from polystyrene plastic material. 15. Plastics are polymers that can be cooled and solidified into any desired shape.

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• The handle and bristle of a toothbrush should not be made of the same material as the handle of the toothbrush should be hard and strong while the bristle should be soft and flexible.

• Plastics are non-corrosive in nature, they do not react even if they come in contact with strong chemicals. For example, the cleaning chemicals that we use at home are stored in plastic bottles, instead of metal containers.

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Answer 2

Correct words for the blanks given in the above sentences:

1. Blended fabrics

They are made of different fiber combinations. Hence they have the property of both natural and synthetic fibers.

2. Spandex/elastane

It is a synthetic fiber that is very much elastic. It is an elastomeric polyurethane (a combination of polymers and polyester).

3. Synthetic

Synthetic fibers are generally known as rayons. They are made from wood pulp hence called artificial fiber.

4. Bakelite

Electrical switches are made up of bad electricity conductors such as bakelite or porcelain.

5. Polymerization

It is a process by which a polymer is formed by combining multiple monomers. For example plastics

6. Cellulose (wood pulp)

The cellulose of soft fibers or wood pulps is synthesized to make synthetic fibers I.e. rayon.

7. Acrylic

Acrylic is a synthetic fiber that is as soft and warm as wool. Hence it is used as a substitute for wool.

8. (PTFE)polytetrafluoroethylene/Teflon

Teflon is a compound made of carbon and fluorine and it is used for coating nonsticky pans.

9. Nylon

It is used for making ropes as this synthetic fiber is stronger than a steel wire.

10. Polyester

It is a synthetic polymer made of ester chains.

11. Thermosetting

these are hard plastics which once molded cannot be reshaped.

12. Petroleum

Petroleum-based chemicals are raw materials for making synthetic fibers.

13. Polymers

Plastics are polymers that are non-biodegradable waste.

14. Polystyrene

It is a polymer of monomer styrene used to make thermocol.

15. Melted, molded

Plastics can be heated and then reshaped to any desired shape.