NCERT Exemplar Solution for Class 8 Science Chapter-3 Synthetic Fibres and Plastics
The modern world depends heavily on materials that are lightweight, durable, and easy to use, and synthetic fibres and plastics are among the most widely used examples. Chapter 3, Synthetic Fibres and Plastics, introduces students to the fascinating world of man-made materials and their applications in daily life. This chapter explains how synthetic fibres are prepared, their characteristics, different types, and the advantages and disadvantages of plastics. Students learn how science and technology have transformed the textile and manufacturing industries through the development of artificial fibres such as nylon, polyester, and acrylic. By studying the chapter through NCERT Exemplar Solution for Class 8, learners can understand scientific concepts in a simple and practical way. The detailed explanations provided in the NCERT Exemplar Solution help students improve conceptual clarity and strengthen problem-solving skills. Students looking for accurate NCERT solutions for class 8 also find this chapter useful because it includes important questions and explanations designed according to the latest syllabus and examination pattern.
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Types and Properties of Synthetic Fibres
Synthetic fibres are man-made fibres prepared from chemical substances. Unlike natural fibres such as cotton and wool, synthetic fibres are produced through industrial processes. These fibres are made from polymers, which are long chains of repeating chemical units. The chapter explains how polymers form the basic structure of synthetic materials and why they possess special properties.
Rayon is one of the first synthetic fibres discussed in the chapter. It is prepared from wood pulp and is often called artificial silk because of its shiny appearance. Nylon is another important synthetic fibre known for its strength, elasticity, and durability. It is widely used in ropes, parachutes, fishing nets, and sports equipment. Polyester is commonly used in clothing because it is wrinkle-resistant and easy to maintain. Many clothes today are made from blends of polyester and natural fibres to increase comfort and durability. Acrylic fibres resemble wool and are often used in sweaters, shawls, and blankets because they provide warmth at a lower cost.
Students also learn about the advantages of synthetic fibres. These fibres dry quickly, are lightweight, strong, and available in different colors and designs. However, they also have disadvantages. Synthetic clothes may catch fire easily and are less comfortable during hot weather because they absorb less sweat compared to cotton. The chapter helps students understand why synthetic fibres have become popular in modern life while also encouraging them to think about their environmental impact.
Plastics and Their Uses in Everyday Life
Plastics are another major topic covered in this chapter. Plastics are also polymers and are widely used because they are strong, lightweight, water-resistant, and inexpensive. The chapter explains two important types of plastics: thermoplastics and thermosetting plastics.
Thermoplastics can be softened and reshaped repeatedly when heated. Examples include polythene and PVC, which are used in pipes, toys, and containers. Thermosetting plastics, on the other hand, cannot be reshaped once heated. Bakelite and melamine are common examples used in electrical switches and kitchen utensils because they resist heat and electricity. Students discover how plastics are used in almost every field, including medicine, transportation, packaging, electronics, and household products. Plastic containers are preferred because they do not react with food and chemicals easily. In hospitals, disposable syringes and medical instruments made from plastic help maintain hygiene and reduce the spread of infection.
The chapter also explains why plastics are preferred over metals in many situations. Plastics are corrosion-resistant, lighter in weight, and easier to handle. Their versatility has made them an essential part of modern civilization. However, the excessive use of plastics has also created environmental challenges. Since most plastics are non-biodegradable, they remain in the environment for a long time and contribute to pollution. This section encourages students to use plastics responsibly and understand the importance of waste management.
Environmental Impact of Plastics and Responsible Usage
One of the most important lessons in this chapter is the environmental effect of plastic waste. Plastic materials do not decompose naturally, which leads to soil and water pollution. Burning plastics releases toxic gases that harm both the environment and human health.
The chapter promotes the concept of the 4Rs: Reduce, Reuse, Recycle, and Recover. Students are encouraged to minimize plastic use, reuse items whenever possible, and recycle waste materials properly. Cloth and jute bags are suggested as eco-friendly alternatives to plastic bags. Scientific awareness about plastic pollution is important for creating a cleaner environment. Students learn how small habits, such as avoiding single-use plastics and disposing of waste properly, can make a big difference in protecting nature.
Practicing questions from NCERT Exemplar Solutions allows students to strengthen their understanding of polymers, fibres, and plastics. These solutions explain important concepts clearly and help students prepare effectively for exams. The chapter not only develops scientific knowledge but also builds environmental awareness and responsible habits among learners.