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NCERT Solutions for Class 8 Science Chapter 3- Synthetic Fibres and Plastics

NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics have been prepared for all the questions available in the exercises. The chapter consists of only one exercise carrying 14 questions in total. The solutions provided for the questions in Chapter 3 cover all the topics in a comprehensive way.

Class 8 Science Synthetic Fibres and Plastics teach you about names, types, uses, advantages and disadvantages of the primary synthetic fibres and plastics used in day to day life. NCERT Solutions for Class 8 Science Chapter 3 by Instasolv are the best study materials for learning and preparing thoroughly for the CBSE exams. You will find that the NCERT Solutions are developed in an interactive manner and are very descriptive.

Solutions of NCERT Class 8 Science Chapter 3 are written in a step by step manner to make you understand complex concepts and scoring well in your exams. NCERT Solutions for Class 8 Science Chapter 3 are reliable sources of study and give you sufficient exposure to the subject.

NCERT Class 8 Science Chapter 3 Synthetic Fibres and Plastics

NCERT Class 8 Science Chapter 3 introduces you to the synthetic fibres or man-made fibres which are used very commonly along with natural fibres for our daily lives. The topics dealt in detail in our NCERT Solutions Class 8 Science Chapter 3-Synthetic Fibres and Plastics are as follows.

  • What are Synthetic Fibres?

This part of the NCERT Class 8 Science Chapter 3 tells you that synthetic fibre is a chain of small units joined together, and the chain is known as ‘polymer’.

  • Types of Synthetic Fibres

This part of the NCERT CBSE Class 8 Science Chapter 3 elaborates about the synthetic fibres used mainly by us. They are

  • Rayon 

Here you will learn that rayon is also known as artificial silk because its texture is similar to natural silk. It is made artificially with chemically treated wood pulp. It is used for creating clothing, bedsheets, carpets and other clothes. 

  • Nylon

This section will teach you that nylon is a pure man-made or synthetic material made using coal, air and water. Nylon fibres are strong, lustrous, light and washable. All these properties find great use in making tents, clothes, ropes, toothbrushes, curtains, parachutes and a lot of other things. 

  • Polyester and Acrylic 

Polyester and Acrylic is another completely synthetic fibre. You can wash it easily and wrinkle-free. Hence, it’s a good choice for making clothes. Terylene can be transformed into fine fibres and is a popular polyester. PET is another polyester used for creating storage utensils and bottles. Acrylic is a synthetic fibre and a good alternative to natural wool which is less available and costly.

Synthetic fibres are more affordable and durable, and this is why they are more accessible and popular in comparison to natural fibres. Synthetic fibres meltdown on heating and catch fire easily. This is a disadvantage of synthetic fibres.

  • Characteristics of Synthetic Fibres

This section on NCERT Solutions for Class 8 Science Chapter 2 teaches you that synthetic fibres have unique characteristics. This makes them popular clothing material. They quickly dry, they are less expensive, durable, easy to maintain and readily available.

  • Plastics

Class 8 Science Synthetic Fibres and Plastics talk about many things made of plastic that we use in our daily lives. Just like synthetic fibre, plastic is a polymer too, but the units may be arranged in linear or cross-linked fashion. This Chapter further introduces you to two types of plastics, thermoplastics which are easy to mould and deform on coming in contact with hot water and the thermosetting plastic which when once moulded cannot be softened by heating.

Polythene and PVC are examples of thermoplastics, used for manufacturing toys, combs and various types of containers.

Melamine and Bakelite are two examples of the thermosetting plastic. Bakelite is a poor conductor of heat and electricity and is used for creating various handles of utensils, and electrical switches. Melamine is used for crafting kitchenware and floor tiles.

  • Plastics as Materials of Choice

This part of the NCERT CBSE Class 8 Science Chapter 3 tells you how plastic items have become an integral part of our lives. The use of plastic is indispensable because plastic is non-reactive. Hence they are used for producing storage materials, chairs, buckets, containers and tables. Plastic is a poor conductor of electricity and heat, and this is why it is used to make things like electric switches to avoid heat and electric shock.

  • Plastics and the Environment

This subtopic tells you that plastics are non-biodegradable hence they are a big threat to the environment. Even though plastic is cheap and convenient to use, we should cut down its usage in order to maintain nature’s balance.

NCERT Class 8 Science Chapter 3- Synthetic Fibres and Plastics: Exercise-Discussion

NCERT CBSE Class 8 Science Chapter 3 given in Science Book, consists of a total of 15 questions. The detailed analysis of the questions asked in NCERT Class 8 Science Chapter 3are given below –

  • Questions 1 to 3 are based on the terms related to rayon, synthetic fibres and plastics; learnt in Class 8 Science Synthetic Fibres and Plastics.
  • Question no. 4, 5, 7, 8,10 and 11 use your higher-order thinking skills to use the concepts learnt related to the characteristics of fibres and plastics. NCERT Solutions for Class 8 Science Chapter 3 – Synthetic Fibres and Plastics solve these questions in an explanatory way.
  • Question no. 6 asks you to write a comparative account of properties of two types of plastics mentioned in Class 8 Science Synthetic Fibres and Plastics.
  • Question no. 12 asks you to write about methods of avoiding plastic in daily lives.
  • Question no. 13 tests your knowledge about the topic of properties of certain man-made fibres. 
  • Question no. 14 tests your analytical skills where it asks you to highlight the positive points related to man-made fibres towards the benefit of the environment. 
  • Question no. 15 tests your imagination and application skills by asking you to design an activity utilizing electrical conductivity properties of thermoplastic.

NCERT Solutions for Class 8 Science Chapter 3 – Synthetic Fibres and Plastics gives you the Solutions of the above questions in a stepwise manner with utmost clarity.