Synthetic Fibres and Plastics Class -8 Science Ch. 3 NCERT

Name: Synthetic Fibres and Plastics Class -8 Science Ch. 3 NCERT
Rating: 3.8 (5 reviews)

Created byPrabh Kirpa Classes

Last updated 8/2021

English

What you'll learn

The students will learn about the properties, uses, and environmental impacts of synthetic fibers and plastics.
They will understand the differences between natural and synthetic materials.
They will explore the characteristics and applications of materials like nylon, rayon, and acrylic.
Students will grasp the distinctions between thermoplastics and thermosetting plastics and their practical uses.
They will classify recyclable and non-recyclable materials and learn why plastics are favored for specific applications, such as food storage.
The students will study the 4Rs—Reduce, Reuse, Recycle, and Recover—and the environmental threats posed by plastics.

Course content

5 sections • 5 lectures • 56m total length

Introduction6:23
NCERT QUESTIONS:
Q.1. : Explain why some fibres are called synthetic
Q.2: Mark the correct answer :
Rayon is different from synthetic fibres because
(a) It has a silk-like appearance
(b) It is obtained from wood pulp
(c) Its fibres can also be woven like those of natural fibre.
Q.3: Fill in the blanks:
(a) Synthetic fibres are also called _____________ or ________________ fibres.
(b) Synthetic fibres are synthesised from raw material called ______________.
(c) Like synthetic fibres, plastic is also a _____________ .
Q.4: Give examples which indicate that nylon fibres are very strong.
Q.5: Explain why plastic containers are favoured for storing food?
Q.6: Explain the differences between thermoplastics and themosetting plastics.
Q.7: (a) Explain why the following is made of themosetting plastics? - Saucepan handles
Q.7: (b) Explain why the following is made of themosetting plastics? - Electric plugs/ switches/plug boards
Q.8: Categorise the materials of the following products into “can be recycled” and “cannot be recycled”.
Telephone instruments, plastic toys, cooker handles, carry bags, ball point pens, plastic bowls, plastic covering on electrical wires, plastic chairs, electrical switches.
Q.9: Rane wants to buy shirts for summer. Should he buy cotton shirts or shirts made from synthetic material? Advise Rane, giving your reason.
Q.10: Give examples to show that plastics are non-corrosive in nature.
Q.11: Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.
Q.12: “Avoid plastics as far as possible” comment on this advice.
Q.13: Match the terms of column A correctly with the phrases given in column B.
Q.14: Manufacturing synthetic fibres is actually helping conservation of forests. Comment.
Q.15: Describe an activity to show that thermoplastic is a poor conductor of electricity.
IMPORTANT QUESTIONS:
Q.1: What is meant by biodegradable and non-biodegradable materials?
Q. 2: What is the meaning of 4Rs ?
Q.3: Why are plastics considered a threat to our environment?
Q.4: What is meant by synthetic fibres?
Q.5: We prefer nylon ropes instead of cotton or jute ropes for rock climbing. Why?
Q.6: We prefer to buy an acrylic blanket instead of wool blanket. Why?
Q.7: Rayon is called an artificial silk. Why?
Q.8: How plastics are used in health care industry?
Q.9 : We should not wear synthetic clothes while working in the kitchen. Why?
Q.10: Plastics are poor conductors of heat and electricity. Give examples.
Q.11 : A bucket made of plastic does not rust like a bucket made up of iron. Why?
Q.12: Name some natural fibres.
Q.13: A synthetic fibre which looks like silk is obtained by chemical treatment of wood pulp. It is known as artificial silk. What is its common name?
Q.14. Name some artificial fibres.
Q.15: Cotton is a natural polymer. What is its chemical name.
Q.16: Terrycot is made by mixing two types of fibres. Write the names of the fibres.
Q.17: What is PET?
Q.18: Name the first fully synthetic fibre.
Q.19: Which raw material is used for making synthetic fibres?
Q..20: Name any two thermoplastics.
Q.21: Why is polyester not suitable for summer wear?
Q.22: Name the polymer used in making non-stick cookwares.
Q.23: Which is the most suitable material for preparation of handles of cooking utensils?
Q.24: Which plastic is used for making crockery?
Q.25: Which fibre is similar to wool or often used as a substitute to wool?
Q.26: Whether most of the plastics are biodegradable?

Why some fibres are synthetic, plastic containers favoured for storing food? etc10:19
Q.1. : Explain why some fibres are called synthetic
Q.2: Mark the correct answer :
Rayon is different from synthetic fibres because
(a) It has a silk-like appearance
(b) It is obtained from wood pulp
(c) Its fibres can also be woven like those of natural fibre.
Q.3: Fill in the blanks:
(a) Synthetic fibres are also called _____________ or ________________ fibres.
(b) Synthetic fibres are synthesised from raw material called ______________.
(c) Like synthetic fibres, plastic is also a _____________ .
Q.4: Give examples which indicate that nylon fibres are very strong.
Q.5: Explain why plastic containers are favoured for storing food?
Q.6: Explain the differences between thermoplastics and themosetting plastics.

NCERT Questions 7 to 15 - themosetting plastics, shirt for summer-cotton or syn.12:41
Q.7: (a) Explain why the following is made of themosetting plastics? - Saucepan handles
Q.7: (b) Explain why the following is made of themosetting plastics? - Electric plugs/ switches/plug boards
Q.8: Categorise the materials of the following products into “can be recycled” and “cannot be recycled”.
Telephone instruments, plastic toys, cooker handles, carry bags, ball point pens, plastic bowls, plastic covering on electrical wires, plastic chairs, electrical switches.
Q.9: Rane wants to buy shirts for summer. Should he buy cotton shirts or shirts made from synthetic material? Advise Rane, giving your reason.
Q.10: Give examples to show that plastics are non-corrosive in nature.
Q.11: Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.
Q.12: “Avoid plastics as far as possible” comment on this advice.
Q.13: Match the terms of column A correctly with the phrases given in column B.
Q.14: Manufacturing synthetic fibres is actually helping conservation of forests. Comment.
Q.15: Describe an activity to show that thermoplastic is a poor conductor of electricity.

Some very important questions of Synthetic Fibres and Plastics13:45
Q.6: We prefer to buy an acrylic blanket instead of wool blanket. Why?
Q.7: Rayon is called an artificial silk. Why?
Q.8: How plastics are used in health care industry?
Q.9 : We should not wear synthetic clothes while working in the kitchen. Why?
Q.10: Plastics are poor conductors of heat and electricity. Give examples.
Q.11 : A bucket made of plastic does not rust like a bucket made up of iron. Why?
Q.12: Name some natural fibres.
Q.13: A synthetic fibre which looks like silk is obtained by chemical treatment of wood pulp. It is known as artificial silk. What is its common name?
Q.14. Name some artificial fibres.
Q.15: Cotton is a natural polymer. What is its chemical name.
Q.16: Terrycot is made by mixing two types of fibres. Write the names of the fibres.
Q.17: What is PET?
Q.18: Name the first fully synthetic fibre.
Q.19: Which raw material is used for making synthetic fibres?
Q..20: Name any two thermoplastics.
Q.21: Why is polyester not suitable for summer wear?
Q.22: Name the polymer used in making non-stick cookwares.
Q.23: Which is the most suitable material for preparation of handles of cooking utensils?
Q.24: Which plastic is used for making crockery?
Q.25: Which fibre is similar to wool or often used as a substitute to wool?
Q.26: Whether most of the plastics are biodegradable?

Requirements

Description

This course explores the fascinating world of synthetic fibers and plastics, focusing on their properties, uses, and environmental impacts. Students will learn why certain fibers are called synthetic and understand the differences between natural and synthetic materials. Through various exercises, they will identify characteristics of materials like nylon, rayon, and acrylic, while examining their strength, durability, and applications in daily life.

The course highlights key concepts such as thermoplastics and thermosetting plastics, explaining their distinctions and practical uses in products like saucepan handles and electrical switches. Students will also classify materials into recyclable and non-recyclable categories and understand why plastics are preferred for specific purposes, such as food storage, due to their non-corrosive and lightweight nature.

Environmental awareness is a significant focus, as students explore the 4Rs—Reduce, Reuse, Recycle, and Recover—and discuss the threats plastics pose to ecosystems. Topics like biodegradable versus non-biodegradable materials and the importance of avoiding excessive plastic use are covered in depth. Additionally, the course examines the health care industry's reliance on plastics and their role as insulators in various applications.

By the end, students will grasp the benefits and drawbacks of synthetic fibers and plastics, enabling them to make informed choices about their use and environmental responsibility.

Who this course is for:

Class 8 Science Chapter - Synthetic Fibres and Plastics

Synthetic Fibres and Plastics Class -8 Science Ch. 3 NCERT

What you'll learn

Explore related topics

Course content

Introduction1 lecture • 6min

Why some fibres are synthetic, plastic containers favoured for storing food? etc1 lecture • 10min

NCERT Questions 7 to 15 - themosetting plastics, shirt for summer-cotton or syn.1 lecture • 13min

Biodegradable/non-biodegradable materials, 4Rs, plastics are threat, nylon ropes1 lecture • 13min

Some very important questions of Synthetic Fibres and Plastics1 lecture • 14min

Requirements

Description

Who this course is for: