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Last Updated On September 19, 2022

Page No 42: - Chapter 3 Synthetic Fibers & Plastics class 8 ncert solutions Science - Free PDF Download 2022 - 2023

Question 13:

Match the terms of column A correctly with the phrases given in column B.

A

B

(i)

Polyester

(a)

Prepared by using wood pulp

(ii)

Teflon

(b)

Used for making parachutes and stockings

(iii)

Rayon

(c)

Used to make non-stick cookware

(iv)

Nylon

(d)

Fabrics do not wrinkle easily

Answer:

A

B

(i)

Polyester

(d)

Fabrics do not wrinkle easily

(ii)

Teflon

(c)

Used to make non-stick cookware

(iii)

Rayon

(a)

Prepared by using wood pulp

(iv)

Nylon

(b)

Used for making parachutes and stockings


Question 14:

‘Manufacturing synthetic fibres is actually helping conservation of forests’. Comment.

Answer:

Raw materials for natural fibres are mainly derived from plants and this means cutting a lot of trees. This leads to deforestation. But raw materials of synthetic materials are mainly petrochemicals. Hence, manufacturing synthetic fibres helps in the conservation of forests.

Question 15:

Describe an activity to show that thermoplastic is a poor conductor of electricity.

Answer:

We will design a circuit to see that thermoplastics are poor conductors of electricity. We need a bulb, some wires, a battery, a piece of metal, and a plastic pipe. Set up the circuit first with the metal and then with the plastic pipe (as shown in the figure). After you switch on the current, you will observe that the bulb glows in the former case. In the latter case, the bulb does not glow. Hence, a plastic pipe (which is a thermoplastic) is shown to be a poor conductor of electricity. https://img-nm.mnimgs.com/img/study_content/content_ck_images/images/1(533).png

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