Science- Fibres and Plastics Online Practice Exams

Science- Fibres and Plastics

Free Mock Test

Questions 10
Maximum mark 10

Introduction

Welcome to the study material on "Fibres and Plastics" for your 8th class Science exams. In this section, we will explore the fascinating world of fibres and plastics and their diverse applications in our daily lives.

Natural Fibres

Discover various natural fibres, such as cotton, wool, and silk. Learn about their sources, properties, and uses in making fabrics and textiles.

Synthetic Fibres

Explore the world of synthetic fibres, including polyester, nylon, and acrylic. Understand how these fibres are manufactured and their advantages over natural fibres.

Blended Fabrics

Learn about blended fabrics, which are a combination of natural and synthetic fibres. Understand how blending enhances fabric properties and widens their applications.

Plastics: An Overview

Understand the composition and properties of plastics. Learn about the different types of plastics and their applications in various industries.

Plastics and the Environment

Explore the environmental impact of plastics and their contribution to pollution. Understand the importance of plastic recycling and responsible plastic usage.

Role of Plastics in Daily Life

Discover the significance of plastics in our everyday lives. Learn about their applications in packaging, construction, healthcare, and other industries.

Uses of Fibres and Plastics

Explore the diverse uses of fibres and plastics in making clothing, household items, industrial materials, and more.

Advancements in Fibres and Plastics

Stay updated on the latest advancements in the field of fibres and plastics. Learn about innovative materials and technologies that are shaping the future of these industries.

Conclusion

Fibres and plastics play a vital role in modern life, from the clothes we wear to the products we use daily. By understanding their properties and applications, we can make informed choices and contribute to a more sustainable and environmentally friendly future.

Explore More Topics

At MyTAT, we provide study material on various other Science topics for 8th class exams. Dive into different concepts to prepare comprehensively for all your exams.

Science- Fibres and Plastics Online Practice Exams FAQs

1. What are fibres, and what are the different types of natural fibres?

Fibres are thread-like structures that are used to make fabrics and other materials. There are two main types of fibres: natural fibres and synthetic fibres. Natural fibres come from plants and animals. Some examples of natural fibres include:

Cotton: Cotton fibres come from the cotton plant's seed pods and are known for their softness and breathability.
Wool: Wool fibres come from the fleece of sheep and other animals like goats and rabbits. Wool is warm and insulating.
Silk: Silk fibres are produced by silkworms and are known for their smooth and lustrous appearance.
Jute: Jute fibres come from the stem of the jute plant and are commonly used to make bags and ropes.
Coir: Coir fibres come from the outer husk of coconut and are used to make doormats and other products.

These natural fibres have been used for centuries to make clothing, textiles, and various other products.

2. What are synthetic fibres, and why are they widely used?

Synthetic fibres are man-made fibres that are produced through chemical processes. They are designed to have specific properties and characteristics suitable for various applications. Some common synthetic fibres include:

Polyester: Polyester fibres are lightweight, durable, and wrinkle-resistant. They are widely used in clothing, upholstery, and carpets.
Nylon: Nylon fibres are strong and elastic, making them suitable for a variety of applications, such as clothing, ropes, and fishing nets.
Acrylic: Acrylic fibres resemble wool and are used as a cheaper alternative for making sweaters and blankets.
Rayon: Rayon is a semi-synthetic fibre made from cellulose and is used in various textiles and clothing items.
Spandex: Spandex, also known as Lycra, is highly elastic and used in stretchable fabrics like sportswear and swimwear.

Synthetic fibres are popular because they are often more affordable, easy to produce in large quantities, and can be engineered to have specific properties like strength, elasticity, and water resistance.

3. What are plastics, and how are they different from fibres?

Plastics are a type of synthetic material that can be molded into various shapes and forms. Unlike fibres, which are long and thread-like, plastics are usually solid and can take the form of bottles, containers, toys, and other objects. Plastics are made from polymers, which are large molecules composed of repeating subunits called monomers. The process of polymerization allows monomers to join together, forming long chains that give plastics their unique properties. Plastics can be rigid, like those used in bottles, or flexible, like those used in plastic bags. They are widely used in packaging, construction, electronics, and various other industries due to their versatility and low cost of production.

4. How are natural fibres converted into fabrics for clothing?

The process of converting natural fibres into fabrics involves several steps:

Harvesting: Natural fibres are obtained by harvesting the raw materials from plants or animals. For example, cotton is harvested from cotton plants, while wool is obtained from sheep.
Cleaning and Sorting: The harvested fibres are cleaned to remove impurities and sorted based on length and quality.
Spinning: The cleaned fibres are spun into yarns, which are long, continuous strands of fibres. Spinning can be done using traditional methods or modern machinery.
Weaving/Knitting: The yarns are then woven on a loom or knitted using knitting machines to create fabric.
Dyeing and Finishing: The fabric may be dyed to add color, and finishing processes like bleaching or sizing may be applied to achieve the desired properties.

The resulting fabric can then be used to make clothing, household textiles, and various other products.

5. What are the advantages and disadvantages of using plastics?

The use of plastics has both advantages and disadvantages:

Advantages:
- Lightweight: Plastics are lightweight, making them easy to transport and use in various applications.
- Durable: Plastics are durable and can withstand wear and tear, making them suitable for long-lasting products.
- Water-Resistant: Many plastics are water-resistant, making them suitable for packaging and outdoor use.
- Versatile: Plastics can be molded into different shapes, sizes, and forms, offering versatility in design and functionality.
- Cost-Effective: Plastics are often less expensive to produce compared to other materials, making them cost-effective for mass production.
Disadvantages:
- Environmental Impact: Plastics are non-biodegradable and can persist in the environment for a long time, leading to pollution and harm to wildlife.
- Health Concerns: Some plastics contain harmful chemicals that can leach into food or water, raising health concerns.
- Waste Management: Improper disposal of plastics can lead to littering and pose challenges for waste management and recycling.
- Dependency on Fossil Fuels: Plastics are derived from fossil fuels, contributing to the depletion of non-renewable resources.
- Microplastics: Plastics can break down into tiny particles known as microplastics, which can be ingested by organisms and enter the food chain.

Balancing the benefits of plastics with their environmental and health impacts requires responsible use, recycling, and sustainable alternatives.