NCERT Solutions for Class 8 Science Chapter 3 - Free PDF Download
Synthetic Fibres and Plastics Chapter 3 of Science Class 8 is one of the most important topics for the students to cover in their exams. These solutions provided by Vedantu are designed appropriately for the proper understanding of students. They bring clarity in concepts, reason wise explanation, and examples in each answer which makes the area of understanding wider. In this article , you will find Synthetic Fibers And Plastics NCERT Solutions Class 8 Science free pdf for downloads
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Access NCERT Solutions for Class 8 Science Chapter 3 – Synthetic Fibers and Plastics
1. Explain why some fibers are called synthetic.
Ans: Some fibers are called synthetic because-
They are man-made, meaning they are made from chemicals like petrochemicals.
They are artificial fibers made with or without using any natural raw material from plants or animals.
Synthetic fibers are typically a chain of small units joined together to form a large single unit called a polymer.
Examples of synthetic fibers are nylon, rayon, acrylic, and polyester.
2. Mark the correct answer.
Rayon is different from synthetic fibers because
(a) It has a silk-like appearance.
(b) It is obtained from wood pulp.
(c) Its fibers can also be woven like those of natural fibers.
Ans: (b) it is obtained from wood pulp
Rayon is obtained from a natural source, wood pulp; while most synthetic fibers are made without using any natural raw material from plants or animals.
3. Fill in the blanks with appropriate words.
(a) Synthetic fibers are also called __________ or __________ fibers.
Ans: artificial or man-made
(b) Synthetic fibers are synthesized from raw material called __________
(c) Like synthetic fibers, plastic is also a __________ .
4. Give examples which indicate that nylon fibers are very strong.
Ans: Nylon is a man-made fiber produced from coal water and air. It is strong, elastic, and light. It is said to be stronger than steel wire. Because of this property nylon is used for making parachutes and ropes for rock climbing. It is also used in seat belts for cars and fishing nets as well.
5. Explain why plastic containers are favored for storing food.
Ans: Plastic containers are most convenient for storing food because:
of their lightweight, good strength, lower price, and easy handling.
Most importantly plastic containers do not react with the food item that is stored in them, making them safe to store.
6. Explain the difference between thermoplastic and thermosetting plastics.
Ans: The difference between thermoplastic and thermosetting plastics is given below,
They can be bent easily.
They cannot be bent easily; instead, they break up on applying force.
They soften upon heating. Hence they can be remolded and reshaped.
They do not soften upon heating. Hence they cannot be remolded and reshaped.
These have been used for the production of combs, toys, and different kinds of containers.
It has been used for creating electrical switches, handles of different utensils, for manufacturing floor kitchenware, tiles, and fabrics that resist fire.
Examples: Polythene and PVC
Examples: Bakelite and melamine
7. Explain why the following are made of thermosetting plastics.
(a) Saucepan handles
(b) Electric plugs/switches/plug boards
(a) Saucepan handles– Thermosetting plastics, such as melamine, are used because they resist fire and can withstand heat better than other polymers. They also don't easily bend or melt when heated.
(b) Electric plugs/switches/plug boards – They are made from thermosetting plastics like bakelite because it is a poor conductor of heat and electricity. Thus in case of any short or current leakage, it will not allow the electricity to pass and harm the user.
8. Categorize the materials of the following products into ‘can be recycled’ and ‘cannot be recycled’.
9. Rana wants to buy shirts for summer. Should he buy cotton shirts or shirts made from synthetic material? Advise Rana, giving your reason.
Ans: Rana should buy cotton shirts for summer because cotton can absorb the sweat easily and allows the evaporation of sweat through its pores, helping Rana to cool down his body during the hot summer season. Also, it is not advised to buy synthetic shirts because the synthetic fibers do not absorb sweat and make it uncomfortable during the hot climate.
Give examples to show that plastics are non corrosive in nature.
Ans: Plastics are non corrosive in nature because-
They do not react with water and air. That is why an exposed iron nail rusts, but plastic remains unaffected.
Plastics do not react even with most chemicals. For example, cleaning materials like acid and detergents are usually stored in plastic containers but not in metal containers.
Plastic is used to store food as well because it does not react with the food stored in it. For example, we store pickles, dry food in plastic containers but not in metal containers.
11. Should the handle and bristles of a toothbrush be made of the same material? Explain your answer.
Ans: No, the handle and bristles of a tooth brush should not be made of the same material because the bristles which are used to brush our teeth must be soft and flexible; while the handle which we hold and grip on must be hard and strong.
That is why the bristles are made up of nylon, while the handle is made of thermosetting plastics like melamine or bakelite.
‘Avoid plastics as far as possible’. Comment on this advice.
Ans: ‘Avoid plastics as far as possible’ as-
Plastics are non-biodegradable in nature, meaning it is not easily decomposed by natural processes. Plastics typically take several years to decompose and are not environmentally friendly. They tend to cause environmental pollution as well.
Even when the plastics are burnt to get rid of them, they do not burn completely and would release poisonous fumes into the atmosphere causing air pollution.
The plastic bags which are thrown in dumps are eaten and swallowed by animals like cows, which would choke the respiratory tracts of the animal, resulting in its death.
There are also cases of plastic bags clogging our drainage systems.
Hence we should avoid them as much as possible and try to use plastic alternatives like cotton or jute bags.
As responsible citizens, we must be environmentally friendly and practice Reduce, Reuse and Recycle principles.
Match the terms of column A correctly with the phrases given in column B.
(a) Prepared by using wood pulp
(b) Used for making parachutes and stockings
(c) Used to make non-stick cookware
(d) Fabrics do not wrinkle easily
(i) Polyester - (d) Fabrics do not wrinkle easily
(ii) Teflon - (c) Used to make non-stick cookware
(iii) Rayon - (a) Prepared by using wood pulp
(iv) Nylon - (b) Used for making parachutes and stockings
14. ‘Manufacturing synthetic fibers is actually helping conservation of forests’. Comment.
Ans: It is true that manufacturing synthetic fibers is actually helping conservation of forests. As synthetic fibers are man-made, meaning they are made from chemicals like petrochemicals. Synthetic fibers are artificial fibers that can be made with or without using any natural raw material from plants or animals. Thus their existence has helped in the substitution of natural fibers like cotton, silk, wool, jute which are obtained from plants and animals. So it means that trees need not be cut down for their production, since there is a man-made alternative. This can aid in preventing deforestation as well.
15. Describe an activity to show that thermoplastic is a poor conductor of electricity.
Ans: In order to show that thermoplastic is a poor conductor of electricity, let us make use of a simple circuit with a bulb, battery, switch, metal rod, and PVC (thermoplastic) of the same dimensions, and connecting wires.
Set up two circuits as shown below.
(i) (Image will be uploaded soon)
(ii) (Image will be uploaded soon)
Switch on the circuit.
It is observed that in the first case (i), with a metal rod, the bulb lights up. It implies that the metal rod is a good conductor of electricity.
In the second case (ii), with a PVC pipe, the bulb does not light up. It implies that the PVC i.e. thermoplastic is a poor conductor of electricity.
NCERT Solutions for Class 8 Science Chapter 3 - Synthetic Fibres and Plastics
NCERT Solutions for Class 8 Science Chapter 3 – Free PDF Download
NCERT solutions for Class 8 Science Chapter 3 are very crucial from the final exam’s perspective. The Ncert solutions for Class 8 Science Chapter 3 Synthetic Fibres And Plastics are provided in such a way that students get a better understanding of the topic. Clarity of concept, quick absorption of the content and an easy language to comprehend are some of the main objectives of this solution. Ncert solutions of Class 8 Science Chapter 3 learning is especially important to understand the NCERT concepts, terminologies, and questioning pattern.
The solutions are specially drafted, topic wise, by specialized professional staff with a greater understanding of the concepts, and the kind of answers that need to be written in exams. Downloading these Ncert Class 8 Chapter 3 Science solutions PDF will undoubtedly help you in learning and crystal-clear logical thinking.
Download Ncert Class 8 Chapter 3 Science solutions free pdf with a single click on the pdf link given below.
NCERT Solutions for Class 8 Science Chapter 3 - Synthetic Fibres And Plastics
Class 8 Chapter 3 Synthetic Fibres and Plastics includes different topics like synthetic fibres meaning, types of synthetic fibres, their characteristics, plastics, benefits of plastics, use of plastic as a choice, hazards of plastic on the environment, and exposure to many fibres like nylon, rayon, melamine, bakelite, etc.
This chapter deals with the type of cloth we use in our daily life. The cloth is made up of fabric, so there are two types of fabric explained in the chapter. The natural fibre which is obtained from plants and the synthetic fibre which is synthesized by humans using some chemicals.
There are a variety of synthetic fibres present in the environment with a diverse range of characteristics and benefits. This Class 8th Science Chapter 3 explains the various things around us made up of different kinds of synthetic fibres.
We have to understand the core concepts of these fibres to understand their implementation in their surroundings. Also, there is an elaborate description of plastics, the types of plastics, the impact of plastic on the environment, and a logical understanding among humans to make an easy choice whether to use plastic or not. Here also, the implementation of plastics is essential in various things surrounding us, and the questions are asked about these objects and their texture with justified reasons.
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FAQs (Frequently Asked Questions)
1. Why Are Saucepan Handles Made of Thermosetting Plastics?
Thermosetting plastics are poor conductors of heat; hence they do not get heated up while cooking. That's why saucer pan handles are made of thermosetting plastics.
2. How Plastics Are a Threat to the Environment?
Plastics are non-biodegradable; hence they can not be decomposed by either natural or man-made decomposers. They get collected in soils, oceans, or any other place where dumped, therefore, imparting a threat to natural life and the environment.
3. What Are the Examples of Synthetic Fibres?
There are many examples of synthetic fibres like nylon, rayon, bakelite, melamine, etc.
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6. What are synthetic fibres according to Chapter 3 of Class 8 Science?
The various synthetic fibres are:
Rayon - Processed from wood pulp, rayon is similar to silk, and it may be dyed in a variety of colours. It is also cheaper than silk.
Nylon - The first commercially produced synthetic fibre, nylon is processed from coal, water and air. Nylon is extremely durable and appears like silk.
Polyester - Probably one of the most popular synthetic fibres, polyester is created using repeating units of ester.
Acrylic - Known as artificial wool, acrylic is a fibre that closely resembles wool.
7. Which guide is the best for Chapter 3 of Class 8 Science CBSE?
NCERT Solutions by Vedantu for Class 8 CBSE is the best choice for guiding you through your exams and helping you score very well. These solutions are curated by teachers who are experts in their fields and are perfect to help you clear the concepts and learn the basics properly. The NCERT solutions by Vedantu provide authentic and genuine guidance to students to help them score the best in their exams with proper preparation as well as a clear understanding of all topics.
8. How can I ace Chapter 3 of Class 8 Science?
The NCERT textbook should be your first priority. Follow your NCERT book thoroughly alongside your class notes. To have a better idea of the types of questions, NCERT solutions provided by Vedantu are a great choice. They contain revision of chapters, simple language, extra questions as well as diagrams. The NCERT solutions also provide a thorough conceptual understanding of the theory part, meaning you will be able to effectively answer questions in the exam as well. These are also free to download and you can access them anywhere.
9. What are the basics of Class 8 Chapter 3 Science?
Chapter 3 of Class 8 Science deals with the concept of synthetic fibres. These are called synthetic because they are artificially prepared using chemicals. This chapter also discusses a few examples of such synthetic fibres, as nylon, acrylic, rayon, polyester etc. To know in detail about the basics of Class 8 Chapter 3 Science, make it a point to download and study the NCERT Solutions for Class 8 Science that will surely help you to understand your concepts easily and clearly.