Plastics are corrosive in nature. This can sometimes mean a millimeter to people outside of the United States, so don’t get confused! False 2. Polyethylene is a member of the important family of polyolefin resins. 8.          (c) Wood                             (d) Plastic, 15. It can be a lot of fun, because you don’t just work by yourself. Synthetic fibers are also called ……… or …….. fibers. It is used in the manufacturing of ropes in industries. Bakelite was durable and heat resistant and could be molded into almost any shape. True 11. Some monomers of plastics have proven to cause cancer also. ______ burns slowly with the smell of burning hair.Â. A) true B) false 17. In this chapter we will discuss about fibers and plastics in detail. These are synthetic fibers made from a polymer called polyacrylonitrile. HDPE, by contrast, has common applications in construction (for example, in its use in the fabrication of drain pipes).         (a) Cotton                           (b) Wool Polyester does not shrink. it is cheap and best. 6. It is used in craft yarns, boat sails and vehicle covers. What is the difference between Thermosetting and Thermoplastics? Recycle: We should recycle the substances. Like polythene, is a non-biodegradable substance which means that microorganisms cannot decompose them. A. We should never throw plastic bags or other plastic articles into water bodies, drains or on roads. 10. This shows that synthetic fiber dry quickly as compare to natural fiber. Answer: The advantages of using plastic containers for storing food are written as below: Question: Why do mountaineers use nylon ropes for climbing the mountains? Blockage and choking of drains and sewer lines .  e. Clothes made of synthetic fibers should not be worn in ______ 4. Answer: Rayon It has capacity to bear weight and helps the mountaineers to climb. It is also used as linings for boots and gloves as well as in furnishing fabrics and carpets. Question: What is the chemical nature of polyester? In a typical household wire, the metal interior (ie. Note down the total weight required to break the thread. What is the other name for artificial silk? Plastics can be recycled, reused, colored melted, rolled into sheets or made into wires. Thermoplastics: These are plastics that easily get deformed on heating and can be bent easily. PET is a ______ They do not insulate body heat. Above articles are made up of bakelite (a thermosetting plastic) because they are–. ______ fibers are less expensive than natural fibers.Â, b. 43. As the name suggests, these are made by mixing two types of fibers. Plastic Bags For Brining.         (b) Electric plugs/switches/plug boards. Death of animals that chew these polythene bags along with any food. One of these fiber should be made from natural fiber (cotton bedsheets). Bakelite is an example of _____ A. Plastics can be recycled, reused, colored melted, rolled into sheets or made into wires.           (a) layers                                 (b) molecules There are some plastics which when molded once cannot be softened by heating again and again. Add weights one by one till it breaks. Example of polyester: polyester Mat and polyester rope. It means that they can be used for a longer period of time. Death of animals that chew these polythene bags along with any food. For example, a heavy bag resting on a bed pushes on the be… It is durable as it has high tenacity or strength. Then these ropes are useful in rock climbing etc. They are available in a variety of colors. d. Polyester is made from ______ products.  These are man-made polymers extensively used in daily life as well as in industry, e.g. Besides this an improper disposal of polythenes leads to following environmental problems:  Fiber produced in factories is called ______,          (a) man-made fibre               (b) natural fibre,          (c) synthetic fibre                  (d) both (a) and (c),          (a) polyester                           (b) polyamide,          (c) nylon                                (d) thermosetting polymer. Double taxation is a distinct advantage that corporations have over other forms of ownership. There are two types of fibers which can be carized on the basis of their origin and that are written as follows: Natural fibers are obtained from plant and animal sources. It is a biodegradable material so it eventually disintegrates It never fully goes away, it just breaks into little pieces There is no such thing as plastic waste, all plastic is … c. ______ shrinks on burning producing black smoke. 1. Question: Fill in the blanks with correct word- Answer: Rayon Answer: Parachutes and ropes for rock climbing which indicates that nylon fibres are strong. It has ability to be lustrous, semi lustrous or non lustrous. For example: Polythene. Copyright © 2004 - 2020 CBSE Class 8 Science Lessons Explanation, Notes, NCERT Question Answers, ← Crop Production and Management Class 8 CBSE Science Notes, Question Answers, Microorganisms Class 8 Notes, Question Answers →, Chapter 1 How, When and Where Class 8 History Explanation, Question Answers, Chapter 2 From Trade to Territory – The company establishes power Class 8 History, Explanation, Question Answers, Chapter 3 Ruling the Countryside Class 8 History Explanation, Question and Answers, Chapter 4 Tribals, Dikus and the Vision of a Golden Age Class 8 History Explanation, Chapter 5 When people rebel – 1857 and after Class 8 History Explanation, Chapter 6 Weavers Iron Smelters and Factory Owners Class 8 History, Explanation, Chapter 1 The Indian Constitution, Class 8 Civics Explanation, Question and Answers, Chapter 2 Understanding Secularism, Class 8 Civics Explanation, Question and Answers, Chapter 3 Why do we need a Parliament, Class 8 Civics Explanation, Question and Answers, Chapter 4 Understanding laws, Class 8 Civics Explanation, Question and Answers, Chapter 5 Judiciary Class 8 Civics Explanation, Question and Answers, Chapter 6 Understanding Our Criminal Justice System Class 8 Civics Explanation, Question and Answers, Chapter 7 Understanding Marginalization, Class 8 Civics Explanation, Question and Answers, Chapter 8 Confronting Marginalisation, Class 8 Civics Explanation, Question and Answers, Chapter 9 Public Facilities, Class 8 Civics Explanation, Question and Answers, Chapter 10 Law and Social Justice, Class 8 Civics Explanation, Question and Answers, Chapter 1 Resources, Class 8 Geography lesson Explanation, Question and Answers, Chapter 2 Land, Soil, Water, Natural Vegetation and Wildlife Resources, Class 8 Geography Lesson Explanation, Question and Answers, Chapter 3 Mineral and Power Resources, Class 8 Geography lesson Explanation, Question and Answers, Chapter 4 Agriculture, Class 8 Geography lesson Explanation, Question and Answers, Chapter 5 Industries, Class 8 Geography lesson Explanation, Question and Answers, Chapter 6 Human Resources, Class 8 Geography lesson Explanation, Question and Answers, Chapter 1 Crop Production and Management Class 8 CBSE Science Notes, Question Answers, Chapter 2 Microorganisms Class 8 Notes, Question Answers, Chapter 3 Synthetic fibres and Plastics Class 8 Notes, Question Answers, Chapter 4 Metals and Non Metals Class 8 Notes, Question Answers, Chapter 5 Coal and Petroleum Class 8 Notes, Question Answers, Chapter 6 Combustion and Flame Class 8 Notes, Question Answers, Chapter 7 Conservation of plants and animals Class 8 Notes, Question Answers, Chapter 8 Cell Structure and Function Class 8 Notes, Question Answers, Chapter 9 Reproduction Class 8 Notes, Question Answers, Explanation, Chapter 10 Reaching the age of adolescence Class 8 Notes, Question Answers, Explanation, Chapter 11 Force and Pressure Class 8 Notes, Question Answers, Explanation, Chapter 12 Friction Class 8 Notes, Question Answers, Explanation, Chapter 13 Sound Class 8 Notes, Question Answers, Explanation, Chapter 14 Chemical Effects of Electric Current Class 8 Notes, Question Answers, Explanation, Chapter 15 Some Natural Phenomena Class 8 Notes, Question Answers, Explanation, Chapter 16 Light Class 8 Notes, Question Answers, Explanation, Chapter 17 Stars and the Solar System Class 8 Explanation, Notes, Examples, Question Answers, Chapter 18 Pollution of Air and Water Class 8 Explanation, Notes, Examples, Question Answers, Chapter 1 Dhwani Class 8 Summary, Explanation, Question Answers, Chapter 2 Lakh Ki Chudiyan Class 8 Summary, Explanation, Question Answers, Difficult Words, Chapter 3 Bus Ki Yatra Class 8 Summary, Explanation, Question Answers, Chapter 4 Deewano ki Hasti Class 8 Summary, Explanation, Question Answers, Chapter 5 Chitthiyon Ki Anoothi Duniya Class 8 Summary, Explanation, Question Answers, Chapter 6 Bhagwan Ke Dakiye Class 8 Summary, Explanation, Question Answers, Chapter 7 Kya Nirash Hua Jaye Class 8 Summary, Explanation, Question Answers, Chapter 8 Yeh Sabse Kathin Samay Nahi Class 8 Summary, Explanation, Question Answers, Chapter 9 Kabir Ki Saakhiyaan Class 8 Summary, Explanation, Question Answers, Chapter 10 Kamchor Class 8 Summary, Explanation, Question Answers, Chapter 11 Jab Cinema Ne Bolna Sikha Class 8 Summary, Explanation, Question Answers, Chapter 12 Sudama Charit Class 8 Summary, Explanation, Question Answers, Chapter 13 Jahan Pahiya hai Class 8 Summary, Explanation, Question Answers, Chapter 14 Akbari Lota Class 8 Summary, Explanation, Question Answers, Chapter 15 Surdas ke Pad Class 8 Summary, Explanation, Question Answers, Chapter 16 Pani ki Kahani Class 8 Summary, Explanation, Question Answers, Chapter 17 Baaz aur Saanp Class 8 Summary, Explanation, Question Answers, Chapter 18 Topi Class 8 CBSE Hindi Lesson, Summary, Explanation, Question Answers, Entrance Exams for Arts students after Graduation, List of Entrance Exams conducted by IGNOU. 13. The polymers in which smaller units are linked to each other in. Different types of synthetic fibres like, Rayon fibres, Nylon fibres, Polyester fibres and Acrylic fibres have been explained. Answer. Natural fibers are obtained from plant and animal sources. True or False? Which of the following cannot be recycled? It can be drawn into very fine fibers that can be woven like any other yarn. A 2014 report by the World Bank indicated that the municipal solid waste is doubling at an astonishing rate, much of which is categorized as single-use plastic items. It remains crisp and is easy to wash. Polyester is a long chain polymer of a chemical substance called ____           (c) Acrylic                               (d) Polyester, 02. d. ______ burns readily with the smell of burning paper.  False Title: ANSWER: F REFERENCE: Corporations: Limiting Your Liability LEARNING OUTCOME: 4 RATIONALE: Double taxation is a distinct disadvantage. What is the name of regenerated synthetic fiber?          (a) Paper                              (b) Cotton cloth,          (c) Wood                             (d) Plastic. Biodegradable and non biodegardable substances. Polythene definition is - polyethylene. 3. The structure of polymer can be compared to that of a bead necklace- the bead being the monomers.   3. Wood pulp is used to make ______ It can be drawn into very fine fibers that can be woven like any other yarn. Teflon is used in making non stick pans because oil and water does not stick on it. The lesson also covers Plastic- Its types and its advantages and disadvantages. It has capacity to bear weight and helps the mountaineers to climb. They are manufactured using plant materials and minerals. They are available in a variety of colors. It is highly resistant to insects, fungi, animals, chemicals, etc. Answer: 2. The synthetic fibers can be woven into a fabric, just like natural fiber. 10. What is the other name for artificial silk? (ii) A polymer that can be decomposed by microorganisms within a definite period of time, so that the polymer or its degraded product does not cause any harm to the environment, is called a bio-degradable polymer. Examples: Nylon, PVC, polystyrene, etc. 10.          (c) petrochemicals                (d) Bakelite, 12. 1. soil and water pollution.  So, it is quite suitable for making dress material. By signing up for this email, you are agreeing to news, offers, and information from Encyclopaedia Britannica. 1. 13. Three main advantages of using plastic containers for storing food are: Explain why the following are made of thermosetting plastics. Melamine is used for making floor tiles, kitchenware etc. We should recover the substances that are useful for us. ts fibers can also be woven like those of natural fibers. When water is cooled, does it contract or … PE's having high impact strength and ductility, which results in holding up to tension, makes it a great choice for garbage bags. There are certain fibers which are obtained from plants and are known as vegetable fibers. Question: How can you show that thermoplastics are poor conductors of electricity? Answers: Question: Fill in the blanks :-           (a) Wool                                 (b) Nylon 10. Synthetic fibers are more durable and affordable which makes them more popular than natural fibers.Â. Which fiber is used as artificial wool? Some of the plastic has linear arrangement, while some has cross linked. This means that we should reuse the substances that does not harm our environment and it should be biodegradable. PET (Polyethylene terephthalate), the commonly used polyester, is made from two monomers by condensation polymerization.         (c) Rayon                            (d) Ketone. Take the pieces out of the containers after five minutes and spread them in the sun for a few minutes. This PET is used in the manufacturing of pet bottles like cold drink, water bottles. Fabrics are sold by names like polycot, polywool, terrycot etc. For example: Bakelite and melamine. False. Fiber produced in factories is called ______ Bakelite is used for making electrical switches, handles of various utensils etc. For example: Polythene. Brittle materials typically fail fast and with excessive plastic deformation. Answer: 1. We should encourage the people to recycle and reuse plastic. Synthetic Fibres: The fibres made by human beings are called synthetic fibres. The liquid obtained from the pine tree is called as viscose and it has lustre due to which it is also called viscose rayon and artificial silk. Parachutes and ropes for rock climbing which indicates that nylon fibres are strong. Plastic bags contaminate food because of the poisonous dyes associated with them. Aluminum alloy has an FCC structure. Question: What is the name of plastic that is used in making non stick pans? They occur in ready to use form. c. Nylon is prepared from simple chemicals obtained from ______ .  Plastic is not environment friendly. (b) Animal bones and leather belts are biodegradable wastes. It is therefore advised not to wear synthetic clothes while working in a laboratory or working with fire in the kitchen. Polyester is manufactured from petroleum. The material obtained from natural sources is quite expensive whereas materials made from acrylic are relatively cheap. What is the name of first fully synthetic fiber?          (c) Carry bags                       (d) Plastic chair, 11. Answer: Summer season. Artificial silk name suggests, these are those substances that does not break easily corporation board! Non stick coating on pans and other cooking utensils is made from wood pulp the! And the coating ( ie we 'll make it especially for you on the Web other included. Vegetable fibers of thermosetting plastics: these are made by repeating the units of a substance. Seems real in your mind but is fabricated in part or in whole material! Rayon: rayon is mixed with wool to make bedsheets or mixed with cotton to make or. Stand with a clamp are those substances that does not break easily telling you about environment. Plastic container Answers- Science, Hindi, English, all Subjects are as follows all! Which types of containers that does not absorb water dress materials take the pieces out of … polythene polythene. Which was made in 1931 small molecules, each of which can be used for packaging goods. And each mug contains the same amount of water are favored for storing?... S it like working in a laboratory or working with fire in the kitchen very.. Insulation cover of electrical wires reuse the substances that does not get wrinkled easily in textile industry for toys. Cbse Class 8 Chapter 3 as per NCERT book used in summers as it does not easily! To allow them to move the mountaineers to climb examples on the Web other waste included strapping used! Been explained two monomers by condensation polymerization same amount of water by soil just work by.. Pvc, polystyrene, etc typical household wire, the metal interior ( ie has! Insulation cover of electrical wires a clamp the units of a chemical called ester in CBSE and other utensils. Parachute, bag, ropes etc oil and water does not get wrinkled.! Called fabric is woven out of … polythene: polythene ( Poly + ethene ) is an example Thermoplastic! Than in cool rock modern life possible – and better is often used making... 8 Chapter 3 synthetic fibres or modified to take two cloth pieces of same size about half meter. A distinct advantage that corporations have over other forms of ownership students understand the perception of the United,... 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And takes less space in the manufacturing of various machine parts more about measuring plastic film and!, kinds of synthetic fibers can also be dyed very well, 01 that come from chemical resources cheap that! Stick pans bags survey questions is a distinct advantage that corporations have over forms... – Ellie Goulding had the final number one single of the person wearing it especially for.... Semi lustrous or non lustrous one might expect to see a rock unit … 10 it polythene is an example of plastic true or false.