In which of the following do the cross-links prevent the displacement of individual polymer chains on being heated?

a. Bakelite b. Melamine c. Polythene d. PVC

Which of the following is chemically identical to cotton and is used in medical field for making bandages and surgical dressings?

Which of the following is used for making conveyor belts and sails of sail-boats?

The manufacturing of which of the following fibers is helping in the conservation of forests?

a. Nylon b. Polyester c. Rayon d. Acrylic

Which of the following is a fire-resistant plastic and is also used to make special microwaveable cookware?

Which of the following can be made by the process of polymerisation and is lightweight, soft and warm?

Which of the following is obtained from the polymerisation of a chemical compound called ethene?

Which of the following statements is/are false?

a. A polymer is a very big molecule formed by the combination of a large number of small molecules. b. Clothes made of synthetic fibers have a very smooth texture. c. Handle of a toothbrush should be made of thermoplastic and its bristles of thermosetting plastic.

Rayon is a semi-synthetic fiber. Which of the following is not a use of rayon?

Which of the following properties makes rayon different from truly synthetic fibers?

Non-biodegradable materials do not rot away on their own and cause pollution. Which of the following is not a non-biodegradable waste?

Which of the following statements is/are false?

a. Thermoplastics are used for making those articles that may get too hot during use and are hard and rigid. b. In thermoplastics, the long polymer chains are not cross-linked with one another. c. Plastics are chemically unreactive and do not react with air and water.

Articles made of which of the following cannot be recycled?

a. Bakelite b. Polythene c. Melamine d. PVC

Nylon was developed in New York and London. Which of the following is not a property of nylon fiber?

Which of the following pairs represents cellulose polymers?