SEBA Class 8 Science Important Chapter 17 Synthetic Fibres And Plastics

SEBA Class 8 Science Important Chapter 17 Synthetic Fibres And Plastics Solutions English Medium As Per SEBA New Syllabus to each chapter is provided in the list so that you can easily browse through different chapters SEBA Class 8 General Science Additional Solutions and select need one. SCERT Important Solutions For Class 8 General Science Download PDF. Important Notes for Class 8 Science SCERT.

SEBA Class 8 Science Important Chapter 17 Synthetic Fibres And Plastics

Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. Assam SEBA Board Class 8 Science Additional Question Answer are part of All Subject Solutions. Here we have given SCERT Class 8 General Science Important Notes for All Chapters, You can practice these here.

Synthetic Fibres And Plastics

Chapter: 17

PART – II

IMPORTANT QUESTION ANSWER

A. Very Short Type Question & Answer:

1. What is a synthetic fibre?

Ans. A synthetic fibre is a man-made fibre made from chemical substances and is a type of polymer.

2. What is rayon?

Ans. Rayon is an artificial silk fibre made from wood pulp and has properties similar to silk.

3. Which was the first fully synthetic fibre?

Ans. Nylon was the first fully synthetic fibre made without using any natural raw material.

4. Why is polyester popular for making clothes?

Ans. Polyester is wrinkle-free, easy to wash, and durable, making it ideal for dress materials.

5. What is PET?

Ans. PET (Polyethylene Terephthalate) is a form of polyester used for bottles and containers.

6. What is a polymer?

Ans. A polymer is a large molecule made by joining many small chemical units together.

7. Give one use of bakelite.

Ans. Bakelite is used to make electrical switches and handles of utensils.

8. Why should we avoid wearing synthetic clothes in the kitchen?

Ans. Synthetic fibres melt on heating and may cause burns, so they are unsafe in the kitchen.

9. What is the 4R principle?

Ans. The 4R principle stands for Reduce, Reuse, Recycle, and Recover to protect the environment.

10. What is the difference between biodegradable and non-biodegradable materials?

Ans. Biodegradable materials decompose naturally, while non-biodegradable materials do not.

B. Fill in the Blanks:

1. Rayon is made by chemical treatment of ________.

Ans. Wood pulp.

2. Nylon was first made from coal, water, and ________.

Ans. Air.

3. Plastic is a ________ like synthetic fibres.

Ans. Polymer.

4. Bakelite is used for making electrical ________.

Ans. Switches.

5. The principle of managing plastic waste includes Reduce, Reuse, Recycle, and ________.

Ans. Recover.

C. True or False:

1. Polyester is a natural fibre.

Ans. False.

2. Nylon threads are stronger than steel wires.

Ans. True.

3. Bakelite can be remoulded after heating.

Ans. False.

4. Plastic is a good conductor of electricity.

Ans. False.

5. Synthetic fibres are less durable than natural fibres.

Ans. False.