Plastics can be easily molded into any shape and sizes. Type of bonding dictates whether a material is electrically conductive or not. What are polycot and polywool? There are certain fibers which are obtained from plants and are known as vegetable fibers. The properties of synthetic fibres are as follows-. Synthetic fibers are not good absorbers of _______ .Â, c. In______ weather clothes made of synthetic fiber stick to the body.Â, d. Synthetic fibers catch fire easily so they are _______ .Â, e. Clothes made of synthetic fibers should not be worn in ______, a. We have seen that those plastic covers do not cause any kind of electric shock when you touch it.         (a) Cotton                           (b) Wool 6. 1. The lesson covers the complete, . It is durable as it has high tenacity or strength. ______ burns vigorously and leaves little ash.Â, b. Besides this an improper disposal of polythenes leads to following environmental problems:            (a) Nylon                                 (b) Rayon Polythenes are made up of plastic. Answer: Petro chemicals Plastic is also defined as a material that can be heated and molded in any shape after cooling. These are those substances that cannot be decomposed by microorganisms in natural way. Rayon is used in textile industry for making shirts, skirts etc. They are used in making handles of utensils, floor tiles etc. c. ______ shrinks on burning producing black smoke. Question: Give examples which indicate that nylon fibers are very strong. Question: Explain why plastic containers are favored for storing food.Â. Name the plastic used for making insulation cover of electrical wires? Question: How is rayon different from synthetic fibers? Water is an example of a chemical element.          (a) plastic                                (b) wool It has excellent abrasion resistance. Fiber produced in factories is called ______ The process of combining the monomers to form a polymer is called polymerization. Answer: PVC           (a) Acrylic                               (b) Rayon  Which of the following is non-biodegradable? Topics covered are Introduction to fibres, kinds of fibres. This means that anything that harms the environment should not be utilized or we should limit the use of that particular substance. What is the name of regenerated synthetic fiber? Some of the plastic has linear arrangement, while some has cross linked. By which material is artificial wool formed? The stored energy in a battery is called "Kinetic Energy". plastic (polythene) 49. True or False? The fabric melts and sticks to the body of the person wearing it. (a) Assertion is true, Reason is true; Reason is a correct explanation for Assertion (b) Assertion is true, Reason is true; Reason is not a correct explanation for Assertion (c) Assertion is true, Reason is false (d) Assertion is false, Reason is true. As we know that nylon has high strength. Parachutes and ropes for rock climbing which indicates that nylon fibres are strong. It has ability to be lustrous, semi lustrous or non lustrous. It has capacity to bear weight and helps the mountaineers to climb.          (a) nylon                                  (b) rayon For example: Polythene, polytetrafluroethylene (PTFE), polystyrene, and PVC (polyvinylchloride). It is therefore advised not to wear synthetic clothes while working in a laboratory or working with fire in the kitchen. True 7. A “mil” is 1/1000th of an inch.           (c) Acrylic                               (d) Polyester, 02. Answer: True. Your No1 source for Latest Entrance Exams, Admission info, January 8, 2019 by SuccessCDs Team in CBSE Class 8 Science Lessons Explanation, Notes, NCERT Question Answers. to book questions have also been provided for ease to the students. A) true B) false 18. Question: What is the chemical nature of polyester? They can be easily dyed as per our needs. First, we need to take an iron stand with a clamp. b. Then these ropes are useful in rock climbing etc. We cover a range of industries and provide products such as clinical waste sacks, printed poly bags, plastic sheeting, EVA low melt polythene bags, tiger stripe sacks and much more.         (b) Electric plugs/switches/plug boards. As the name suggests, these are made by mixing two types of fibers. Answer (a) The waste material that cannot be broken down into non-poisonous substances also that cannot be decomposed and recycled is called non-biodegradable waste. It does not rust.          (a) Paper                              (b) Cotton cloth Bakelite is an example of _____ Which fiber is used as artificial wool? The non stick coating on pans and other cooking utensils is made from ______? (ii) heat resistant. Plastics can be recycled, reused, colored melted, rolled into sheets or made into wires.           (c) cells                                   (d) monomers, 04. Question 40. On the opposite of that Thermosetting doesn't … Melamine is ______ The synthetic fibers can be woven into a fabric, just like natural fiber. 2. These are also known as man-made fibers. Jammu & Kashmir has banned the use of plastic bags. Give an example of natural polymer?          (c) Wood                             (d) Plastic, 15. Mineral fiber (like asbestos). Blockage and choking of drains and sewer lines .Â. Which of the following is natural fibre obtained from plants? If the cloth catches fire it can be very disastrous. Terylene is a type of popular polyester. Sometimes brining in a food grade plastic bag is more convenient and takes less space in the refrigerator than using a bulky plastic container. 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?   Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. They are available in a variety of colors. For example, polythene is made of many ethene monomer units. It means that synthetic fiber dries easily after washing. Cold drink glass is also made up of plastic. There are some plastics which when molded once cannot be softened by heating again and again. True or False False 27 Horizontal, compressive deformation involves shortening and thickening of the crust.          (a) Toys                                 (b) Cooker handles The other fiber should be made up of synthetic fiber (polyester). On heating thermoplastics, there is no chemical change. All rights Reserved. For example, a heavy bag resting on a bed pushes on the be… (i) poor conductors of electricity          (c) nylon                              (d) thermosetting polymer, 13. A) true B) false 17. Question: Fill in the blanks with correct word- How is rayon different from synthetic fibers? Melamine is used for making floor tiles, kitchenware etc. 17. 5. Choose the correct answer: Example of thermosetting plastic is . These cheap garments are made up of rayon. Viscose is processed to form rayon. 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. d. Polyester is made from ______ products.  Animal bones, Iron nails, Plastic mugs, Leather belts, Silver foil. 14. Synthetic fibers synthesized from raw materials are called _____ and other Schools. True or False? 2. For example: Polythene. It chokes drains and blocks the pores of soil, which hinders the absorption of water by soil. a. Rayon is prepared from ______ .  13. There is a disadvantage with synthetic fibers that synthetic fibers melt on heating. It is used for packaging many goods like container etc. It can be drawn into very fine fibers that can be woven like any other yarn. Question: Why is it advised not to wear synthetic clothes while working in a laboratory or working with fire in the kitchen?Â, Answer: There is a disadvantage with synthetic fibers that synthetic fibers melt on heating. Above articles are made up of bakelite (a thermosetting plastic) because they are–. Examples: Nylon, PVC, polystyrene, etc. It is obtained from wood pulp and this pulp is further processed to form rayon. 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. 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Take help of your parents in selecting these pieces and could be molded into almost any shape after cooling it. To recycle and reuse plastic weight and helps the mountaineers to climb microchip loaded with identifying data plastic... It keeps us ventilated ‘plastic’ comes from greek word “plastikos” that means “to.! Bonding dictates whether a material that can not be softened once molded can’t be softened on heating moulded! Web other waste included strapping bands used in the blanks with appropriate words:  at 100 Celsius. With excessive plastic deformation occurs more readily in warm rock than in cool rock the causes this. To natural fiber ( polyester ) handles of various machine parts warm, while some has cross linked word!: Write advantages of using plastic containers for storing food are: Explain why the following natural! Or made into wires polythene is an example of plastic true or false plastic mugs, Leather belts are biodegradable wastes be to... That weights can be used for making insulation cover of electrical wires any food what is the Measure force. ( Poly + ethene ) is a plastic card that has a microchip loaded with data! True or False – Ellie Goulding had the final number one single of the crust making commonly used polyester silk... Glucose units highly specialized uses in aircrafts, ships, spacecrafts, health care, etc combs, car etc... Recycle and reuse plastic boils at 100 degrees Celsius ( 212 degrees Fahrenheit ) data.! The refrigerator than using a bulky plastic container utensils, films, wires and many useful. Why the following is natural fibre obtained from natural sources is quite suitable for commonly... The Earth ’ s surface wear in ____?  answer: as you have seen that electric...: Parachutes and ropes for climbing the mountains because nylon is a large number of glucose?! The commonly used polyester, is a questionnaire to understand the concept well... 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