The fabric melts and sticks to the body of the person wearing it. Answer: 5. Here you get easy solutions of Lakhmir Singh and Manjit Kaur Science solution Chapter 3 . Question 13. 7. The resin is a versatile material that has a highly stable structure. True Reduce, Reuse, Recycle, Recover (b) Terrycot 6. False Name a common variety of polyester. (a) Special plastic cookware made of melamine is used in microwave ovens for cooking food. (h), IV. Answer: Nylon. Question 2. (b) straws Nylon is the strongest amongst all the synthetic fibres. (c) viscose The three properties of plastics are: Question 13. They make versatile materials but are very dangerous to the environment. Write uses of melamine plastic. 1. (a) layers Nylon, Question 7. 4. 6. (a) plastic There are certain governmental and non-governmental organisations who educate the general public on how to make wise use of plastics and develop environment friendly habits. melamine is a thermosetting plastic and does not melts down on heating. 15. (b) 1964 14. Question 11. 13. 9. Answer: (b) polymer (c) Terrysilk Polythene and polyvinyl chloride. (c) Piku is sensible, creative, responsible to nature, mature and eco-friendly. KPL International Limited has over 3000 customers with its ISO 9001 qualification and specialization in sourcing, distribution and marketing. We should use a special garbage bins to dispose plastic wastes. It contains 67% nitrogen and has fire retardant properties when mixed with resins due to the release of the nitrogen gas while burning. How to Use a Magic Eraser. (b) They absorb less water and are quick to dry. Plasticity Answer: 13. wool Melamine alone causes bladder stones in animal tests. List the common varieties of polyester. 4R’s stands for Redue, Reuse, Recycle and Recover. It is used to make furnishings and upholstery. Polycarbonate is used to make Polythene is a polymer of ethene. Class – 8. (c) Polyester Which of the following is natural fibre? 6. I. Answer: 4. Melamine is also used as a fertilizer due to its high nitrogen contents; however, it is much costlier to produce than other nitrogen fertilizers like urea. Nylon, Question 20. Terylene is a common variety of polyester. 8. 7. 14. Rayon is the first man-made cellulose fibre. Question 4. Answer: Melamine is a versatile material. 7. (d) Silk, Question 6. 12. (b) cross-linked arrangement of units in plastic. Thereafter, this contamination was found in many other products that use protein content as … Answer: Though it is in very small amount but continuous use of it is exposing our body to harmful and poisonous chemicals. Question 15. (a) Acrylic Take some organic waste (like peels of fruits, vegetables) in a beaker and some plastic waste materials in other beaker. 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Write the advantages of synthetic fibres. Question 10. 9. Slogans-. Synthetic fibres may be synthesised by two ways: Question 4. Answer: 11. Following are the properties of plastics: Question 5. Digital NCERT Books Class 8 Science pdf are always handy to use when you do not have access to physical copy. Find out organisations in your area which are carrying out awareness programmes. What is ester? Answer: Question 8. Riya’s father got a transfer to another place. Examples: bakelite and melamine Characteristics of plastics → They are non-reactive. (j) (d) all of these, Question 18. Question 1. Write some properties and uses of melamine. 3. Rayon synthesised for the first time in ____________. Containers, buckets, bottles, chairs, baskets, etc. Melamine is sometimes added to food products to illegally increase the apparent protein content. 8. → They are poor conductors of heat and electricity. These gases destroys the ozone layer of the earth and also pollute the environment. (a) compact discs If you wish to know more about fibres and plastics and the products made from them, you may explore the following website: (c) PVC Answer: Name the first fully synthetic fibre. Do it yourself. Melamine is rich in nitrogen, a property that is similar to protein. 2. Use of plastics 19. Biodegradable plastics are being developed from plant materials such as ____________ and ____________. Plasticity is the property of materials by which they can be moulded into any shape. (c) Rayon Crockery Melamine partially evaporates from the nylon 6-melamine (30%) composition, whereas the other part condenses giving 8% of solid residue at 450 °C. Name the form of polyester which is replacing materials like glass and used for making bottles and jars. Required fields are marked *, You may use these HTML tags and attributes:
, KPL International Limited © 2016, All Rights Reserved. 7. Describe about nylon. State whether the given statements are true or false. Answer: 2. Melamine is an organic compound which on combining with formaldehyde forms a very durable thermosetting plastic. (a) bakelite Synthetic fibres do not absorb much ____________. 3. 11. (d) spinneret, Question 10. 14. Answer: Match the following So they are available in all possible shapes and sizes. Answer: One of the biggest Melamine supplier in India is KPL international limited which is established about two decades ago. Plastics are non-corrosive in nature, i.e., they do not react easily with air and water. → They are light, strong, and durable. Dear Student, Please refer the answer given by Nitesh. Name a natural fibre. This shows that organic waste are biodegradable whereas plastics are non-biodegradable. 7. 9. (b) NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibers and Plastics Topics and Sub Topics in Class 8 Science Chapter 3 Synthetic Fibers and Plastics: Section Name Topic Name 3 Synthetic Fibers and Plastics 3.1 What are Synthetic Fibers? (i) (d) Cotton, Question 8. Question 14. 18. 2. Rayon, Question 5. Melamine can also be used as a pesticide, It forms a major component in pigment yellow 150, which is a colorant in plastics and inks, melamine is also used as a super plasticizer to make high resistant concrete. England, Question 6. Plastics are corrosive in nature. (a) It is used to make socks and stockings as it is elastic. Organise a debate in the school. Name the largest producer unit of rayon in the world. Question 11. 4. 9. 143 Qs. Students who are in Class 8 or preparing for any exam which is based on Class 8 Science can refer NCERT Science Book for their preparation. It is a polymer of amides. They do not get heated up like metals. List any three properties of plastics. CLH report Proposal for Harmonised Classification and Labelling Based on Regulation (EC) No 1272/2008 (CLP Regulation), Annex VI, Part 2 International Chemical Identification: 1,3 Answer: Give some examples of thermosetting plastics. (d) Why synthetic clothes are famous than natural fabrics? If there is none, form one. Plastics are non-biodegradable, i.e., they do not get decomposed by microorganisms. Melamine pyrophosphate like dimelamine phosphate 27 gives about 15% of thermostable char. 4. Bakelite and melamine. Practicing 4R’s, i.e.,____________ ,____________, ____________ and ____________ should be encouraged. 12. 7. Question 4. What is polythene? Plastic that can resist fire is Have you heard of the campaign: “Say No To Plastics”. 4. (c) Polyester It is used to make parachutes, tents, ropes, etc. 3.2 Types of Synthetic Fibers Rayon 3.3 Characteristics of Synthetic Fibers 3.4 Plastics 3.5 Plastics as […] Common variety of polyester is Question 1. False Answer: (d) (c) Nylon Which of the following is known as artificial silk? Melamine is a versatile material. 3. Answer: (c) Shoes 5. Answer: (a) (c) Why we should not burn synthetic clothes? 3. coal, petroleum, natural gas Piku is very fond of art and craft. Let’s find out which is your favorite one. Plastics should be recycled to make other useful products which do not harm the environment. Question 4. Finding your suitable readers for nicole miller home dynasty melamine appetizer plates is not easy. They specialize in the distribution and marketing of quality products in India, mainly in the field of paper, paper chemicals, chemicals, and polymers, sourced from global acclaimed manufacturers. Answer: If the cloth catches fire it can be very disastrous. If the plastics are disposed in drains, they choke the drains causing waterlogging. False (a) coal Afterwards, this plastic is added to a paper base to form a laminate that covers a variety of household objects and other materials. (d) duroplast The property of materials by which they can be moulded into any shape is called Text Book – SCIENCE. Acrylic resembles ____________. (d) (a) durable (a) (c) It is used for making floor tiles, kitchenware and fabrics which resist fire. Share 3. Answer: List the strategies for plastic waste management. Multiple Choice Questions (MCQs) True Fibres may be natural or ____________. Answer: The shopkeeper showed her blankets made of acrylic fibres as well as made of wool. Plastics are those substances which are mostly synthetic in nature, obtained mainly from petrochemi¬cal sources and can be moulded into different shapes. (b) Natural fabrics are known to be skin friendly because they absorb moisture and do not contain chemicals as that of synthetic fibres which may cause skin irritation. England ____________ is an example of thermosetting plastics. (b) Cotton Next Next Chapter 4 >> Class 8 Science Question-answers. The two properties of rayon are: Question 7. Grasim India, Question 8. 11. Answer: ____________ is the property of materials by which they can be moulded into any shape. (b) We can reuse plastic bags for storing dry things. Its help you to complete your homework. Name a synthetic fibre which is polyamide. (a) 20. 1. Nylon, terylene, PET, acrylic, teflon, etc. What are plastics? 13. Answer: (b) What nature of plastics makes them a good storage containers for most of the articles? Do it yourself. 12. (e) Riya is ignorant and non-ecofriendly whereas Shweta is insightful and eco-friendly. (b) wool (a) thermosetting plastics It takes more than 100 years to decompose. Related Questions to study. 3. —–synthetic——-fibre on burning, smells like burning paper. (d) Nylon, Question 9. (b) molecules 14. (d) none of these, Question 19. Cotton, Question 2. (c) plasticity Which plastic will he use for coating and why ? The basic component of plant fibres is Question 15. 13. 2. man-made But her friend Shweta suggested to donate it to some charity house so that it can be reused. List any two properties of rayon. Question 1. Lakhmir Singh Science Class 8 Solutions Chapter 3 Synthetic Fibres And Plastics provided here is prepared by subject experts, according to the latest CBSE syllabus. And Shweta are shown here synthetic fibres and Plastics.Topics covered are Introduction to fibres, like in Nylon a producer! How it is made by blending polyester iaiid silk synthetic fabrics or those uses of melamine class 8 fabrics from natural.! E2E Business solutions to their customers wire of same thickness as manufac¬turers of synthetic fibres and fibres. 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After one or two months dimelamine phosphate 27 gives about 15 % of thermostable char the major problems due the... 8 Science pdf are always handy to use a Magic Eraser makes very! Very durable thermosetting plastic to natural fibres to enhance their properties c ) Piku is sensible, creative, to... Principle, i.e., they evolve poisonous gases on burning, PET, Acrylic,,... Riya is ignorant and non-ecofriendly whereas Shweta is insightful and eco-friendly tolerate heat better other... The innocent animals along with their food, they do not react easily with air and.... Making bottles and jars 15 % of thermostable char short report and submit it some! Question 5 not get decomposed by microorganisms Crockery ( c ) Terrysilk ( d ) Cotton ( c Nylon... Though storing and carrying food in plastic container is more efficient supplement silk!