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

NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics - In this article, you will find the NCERT solutions of chapter 3 Synthetic Fibres and Plastics of Class 8 Science. The NCERT solutions for Class 8 Science chapter 3 Synthetic Fibres and Plastics gives you an explanatory solution of each question given in the NCERT Books.

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Students must refer to these NCERT Solutions for Class 8 to get all their queries resolved. These NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics will help in your homework as well as in preparing for the examination. Read further to get solutions of each question, topics and subtopics included in the chapter, and benefits of these NCERT Solutions.

Q. Most women do not prefer to wear polyester clothes while working in the kitchen. Give reason

Ans. Polyester is a synthetic fabric that melts on heating. So if women wear polyester in the kitchen there are chances that on heating, it will melt and stick to the body causing destruction. Hence most women do not prefer to wear polyester clothes while working in the kitchen.

NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics: Solved Exercise Questions

Q1. Explain why some fibres are called synthetic.

Answer: Some fibres are made by human beings and not obtained from plants and animals. These fibres are obtained by chemical processing of petrochemicals..That is why some fibres are called synthetic or man-made fibres. Few examples are Nylon, Polyester and Acrylic.

Q2. Mark ( tick ) 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 fibres.

Answer: (b) is the correct option.

Rayon also called artificial silk is a man-made fibre, but it is obtained from a natural source, wood pulp. its fibres can also be woven like those of natural fibres

Q3. Fill in the blanks with appropriate words.

(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 __________ .

Answer: (a) Synthetic fibres are also called man-made or artificial fibres.

(b) Synthetic fibres are synthesised from a raw material called petrochemicals.

(c) Like synthetic fibres, plastic is also a polymer.

Q4. Give examples which indicate that nylon fibres are very strong.

Answer: Nylon fibres are used for making parachutes and ropes for rock climbing. These examples indicate that nylon fibres are very strong. Moreover, Nylon fibre is actually stronger than steel wire.

Q5. Explain why plastic containers are favoured for storing food.

Answer: Plastic containers are favoured for storing a food item, water, milk etc. because of the following reasons:

(a) Plastics are lightweight

(b)Plastics are cheaper than metals

(c) Plastics are very strong and are easy to handle.

Q.6. Explain the difference between thermoplastic and thermosetting plastics.

Answer:

Q7.(a) Explain why the following are made of thermosetting plastics.

Saucepan handles

Answer: Thermosetting plastics are those plastics which retain their shape on heating. Saucepan handles are made of thermosetting plastic like Bakelite because it is a poor conductor of heat. Hence, it prevents the hand from getting burned.

Q7. Explain why the following are made of thermosetting plastics.

(b) Electric plugs/switches/plugboards

Answer: Thermosetting plastics are used to make electrical switches because these are a poor conductor of heat and electricity. Hence, they are good insulators and prevents from getting electric shocks.

Q8. 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.

Answer:

Q9. Rana wants to buy shirts for summer. Should he buy cotton shirts or shirts made from synthetic material? Advise Rana, giving your reason.

Answer: Rana should buy cotton shirts and not synthetic shirts for summer.

Because synthetic shirts are not good absorber of moisture as compared to cotton. Hence, during summer, cotton being a good absorber of moisture will let the sweat evaporate from the body.

Q10. Give examples to show that plastics are noncorrosive in nature.

Answer: The cleaning chemicals used at home are stored in plastic bottles, instead of metallic bottles/containers. This shows that plastics are noncorrosive in nature.

Q11. Should the handle and bristles of a toothbrush be made of the same material? Explain your answer.

Answer: No, the handle and bristles of a toothbrush cannot be made of the same material. This is because the handle has to be hard and strong while bristles have to be soft and flexible.

Q12. ‘Avoid plastics as far as possible’. Comment on this advice.

Answer: Although plastics have many properties which makes it very useful in our daily lives, yet we should try to avoid them as far as possible. This is because plastics are non-biodegradable. The waste created by plastics is not environment-friendly, which on burning release poisonous gases. Plastics may take years to degrade and keep on piling up and hence are an environmental hazard for the living community

Q13. Match the terms of column A correctly with the phrases given in column B.

A B

(i) Polyester (a) Prepared by using wood pulp

(ii) Teflon (b) Used for making parachutes and stockings

(iii) Rayon (c) Used to make non-stick cookware

(iv) Nylon (d) Fabrics do not wrinkle easily

Answer:

Q 14. ‘Manufacturing synthetic fibres is actually helping conservation of forests’. Comment.

Answer: Natural fibres like cotton, wool are obtained from plants and animals. To acquire the raw materials, trees and plants have to be chopped off hence leading to deforestation. Whereas synthetic fibres like nylon, polyester are manufactured in laboratories using chemicals or petrochemicals. Hence manufacturing fibres are actually helping the conservation of forests.

Q15. Describe an activity to show that thermoplastic is a poor conductor of electricity.

Answer: Aim: To show thermoplastic is a poor conductor of electricity.

Materials required: A battery, conducting copper wires, an LED bulb, a small PVC (thermoplastic) rod, a metal rod.

Experiment: We make a circuit as shown. First, we connect the two ends of the copper wires with the metal rod. Next, we replace it with the PVC rod.

Observation: The LED bulb glows when the metal rod is connected but does not glow when the PVC rod is connected.

Conclusion: Thermoplastic is a poor conductor of electricity.

About NCERT Class 8 Science Chapter 3 Synthetic Fibres and Plastics

This chapter 3 of NCERT Class 8 Science, explains about Synthetic Fibres and Plastics. You will get knowledge about different types of synthetic fibres, their characteristics, about plastics and a lot more. You can also refer to the NCERT class 8 science solutions Chapter 3 Synthetic Fibres and Plastics to have a deep understanding of the questions asked in this chapter.

What are synthetic fibres

Synthetic fibres are those fibres which are produced in laboratories using chemicals by man. Thus, they are also called man-made fibres. Synthetic fibres are made in such a way that small units join together to form them. These small units that are joined together are called monomers. After joining they form polymers which make up the synthetic fibres.

Types of synthetic fibres

Every day you use so many different types of synthetic fibres such as rayon, nylon, polyester and acrylic. In NCERT science Class 8 chapter 3, you will study about the various characteristics of the above mentioned synthetic fibres. So what do you think “are synthetic fibres better natural fibres”? After reading chapter 3 synthetic fibres and plastics, you will be able to find out the answer to this question.

Each of you must have used objects made up of plastic. In NCERT class 8 chapter 3 Synthetic fibres and plastics, you will get to know the details about what is plastic, how it is made, what are its different characteristics and how they are useful to humans. Have you ever thought why plastic bags are now banned on grocery shops? Why everybody prefers to use paper cups and not plastic cups? You can get answers to these questions in NCERT solutions for class 8 science Chapter 3 Synthetic fibres and plastics.

In the end, there are insights of biodegradable and non-biodegradable substances in your NCERT textbook science chapter 3. Do you segregate your waste when you dispose of them? If yes, then how do you segregate them? Why do we see blue, red, yellow and green dustbins on roads? You will be able to answer all these questions once you have gone through NCERT solutions for class 8 science chapter 3 Synthetic fibres and plastics.

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

• The NCERT Class 8 Science solutions chapter 3 Synthetic Fibres and Plastics provided in this article are easy to understand. All the solutions are given in a very basic language which everyone can easily understand.

• You can check the correct answers and solutions of each question from the NCERT solutions for Class 8 Science chapter 3. This will be really beneficial during home works, and self-study.

• It is very important to refer to the NCERT Syllabus for Class 8 Science to gain maximum benefit from the NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics.

• At times, questions in the Class tests and annual exams have been directly asked from the NCERT Solutions for Class 8 Science Chapter 3. Hence you should check all the solutions carefully.

What After NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastic

• You can refer to the NCERT Books for Class 8 Science to check more chapters and questions.

• To further check these solutions offline, you can get ncert solutions for Class 8 Science chapter 3 by downloading the webpage.

• Once you have completed the NCERT class 8 science solutions Chapter 3 Synthetic Fibres and Plastics, you can check the other chapters solutions. The chapter-wise link of each chapter is provided in the table below.

Synthetic Fibres and Plastics Class 8 Science Chapter 3-Topics

• What are synthetic fibres
• Types of synthetic fibres
• Nylon
• Rayon
• Polyester and acrylic
• Characteristics of synthetic fibres
• Plastic
• Plastics as materials of choice
• Plastics and the environment

NCERT Solutions For Class 8 Science- Chapter-Wise

Tips to Crack CBSE Class 8 Exams

• While preparing for the CBSE Class 8 exams, you should first read NCERT Syllabus for Class 8.

• Make short notes for each topic and revise them on a regular basis.

• Practice all the questions provided in the exercise. You can also refer to the NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics in case of any doubts.

• Take help from your teachers or seniors if you have any questions. Do not let any query unresolved.

Why follow Careers360 to get NCERT Class 8 Solutions

Careers360 provides authentic and to the point solutions to each question. These solutions are prepared by the subject matter experts, which makes it completely reliable. All the NCERT solutions for Class 8 Science chapter 3 Synthetic Fibres and Plastics are given with proper explanations along with the relevant diagrams wherever required.

NCERT Solutions For Class 8: Subject-Wise

• NCERT Solutions for Class 8 Maths
• NCERT Solutions for Class 8 Science

Also Check NCERT Books and NCERT Syllabus here:

• NCERT Books Class 8 Science
• NCERT Syllabus Class 8 Science
• NCERT Books Class 8
• NCERT Syllabus Class 8