NCERT Class VIII Science Solution: Chapter 3-Synthetics Fibres and Plastics Part 2

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Question 8:

Which of the following represents the correct match for items in Column A with those in Column B.?

Which of the Following Represents the Correct Match for Items in Column a with Those in Column B.
Which of the following represents the correct match for items in Column A with those in Column B.

Column A

Column B

Nylon

Thermoplastic

PVC

Thermosetting plastic

Bakelite

Fibre

  1. I-(ii), II-(iii), III-(i)

  2. I-(iii), II-(i), III-(ii)

  3. I-(ii), II-(i), III-(iii)

  4. I-(iii), II-(ii), III-(i)

Answer: B

Question 9:

Which of the following groups contain all synthetic substances?

  1. Nylon, Terylene, Wool

  2. Cotton, Polycot, Rayon

  3. PVC, Polythene, Bakelite

  4. Acrylic, Silk, Wool

Answer: C

Question 10:

The material which is commonly used for making kitchen containers is

  1. PVC

  2. Acrylic

  3. Teflon

  4. PET

Answer: D

VERY SHORT ANSWER QUESTIONS

Question 11:

Cotton is a natural polymer. What is its chemical name?

Answer:

Cellulose.

Image of classification of fibres

Classification of Fibres

Image of classification of fibres

Question 12:

A synthetic fiber which looks like silk is obtained by chemical treatment of wood pulp. It is, therefore, known as artificial silk. What is its common name?

Answer:

Rayon.

Question 13:

Terrycot is made by mixing two types of fibres. Write the names of the fibres.

Answer:

Terylene and cotton

Question 14:

Plastic articles are available in all possible shapes and sizes. Can you tell why?

Answer:

Plastic is easily moldable so the articles can be made in any shape and size.