(c) PVC Question 2. 1. Plastics are the bad conductor of heat. (a) Rayon Answer: Do it yourself. (a) Is it practical to say completely ‘NO’ to plastics? Answer: They can then debate on the topic ‘My Fabric is Superior’. Question 3. 10. cellulose, starch Answer: US $310.00-$435.00 / Cubic Meter. Name the form of polyester which is replacing materials like glass and used for making bottles and jars. What are thermosetting plastics? 12. spinneret (c) cells 12. Board – CBSE. 4R’s stands for Redue, Reuse, Recycle and Recover. Nylon was made in 1931. Question 2. 3. Polymers are compounds that are made up of same, small repeating units, joined together through bonds in a linear pattern. Plasticity It is a polymer of amides. Question 5. Describe about nylon. (e) Give some examples of thermoplastics. 2. Melamine is rich in nitrogen, a property that is similar to protein. Plastics that retain their plasticity on repeated heating are called Advantages of synthetic fibres are: Question 9. (a) linear arrangement of units in plastic. Melamine alone causes bladder stones in animal tests. 12. It is fully synthetic polymer which is prepared from coal, water and air. Plastics are non-biodegradable in nature. Devise an activity to show that organic waste is biodegradable while plastic is not. Melamine is sometimes added to food products to illegally increase the apparent protein content. Name a natural fibre. Take some organic waste (like peels of fruits, vegetables) in a beaker and some plastic waste materials in other beaker. In which year was nylon made? (b) (a) thermosetting plastics (d) Question 2. Answer: (b) molecules Special plastic cookware made of melamine is used in microwave ovens for cooking food. Class – 8. (b) thermoplastics We can reuse plastic bottles for storing dry food grains or a pen keeper, etc. (a) plastic 8. Question 11. Containers, buckets, bottles, chairs, baskets, etc. List the common varieties of polyester. What is rayon? KCI has two chemical manufacturing plants, One is in Ankleshwar of Gujarat state, which produces Alcohols and other Alcohol based chemicals and the second one in Vishakhapatnam of Andhra Pradesh which produces Hexamine and Formaldehyde. List the strategies for plastic waste management. Answer: Which of the following is a characteristic of plastics? Question 1. 14. water Answer: One of the biggest Melamine supplier in India is KPL international limited which is established about two decades ago. (c) 1948 (a) Two main types of fibres are natural and man-made fibres. (b) Rayon It is used to make socks and stockings as it is elastic. Name a synthetic fibre which is polyamide. (d) spinneret, Question 10. Melamine foam is a special form of melamine resin. Nylon, Question 20. (b) Heat conductors 3.2 Types of Synthetic Fibers Rayon 3.3 Characteristics of Synthetic Fibers 3.4 Plastics 3.5 Plastics as […] (c) Answer: (a) Though storing and carrying food in plastic container is more efficient. Question 4. England 15. Answer: 6. 4. Question 1. (a) conductivity Answer: KPL International Limited is an arm of Kanoria Chemicals & Industries Limited (KCI), which is a very diversified company with OHSAS 18001, ISO 14001 and ISO 9001 certification. What are the uses of polyester? (c) economical (g) 15. melts, III. Question 11. Name some objects made of plastics. Answer: (a) compact discs (d) All of these, Question 15. 16. 9. Practicing 4R’s, i.e.,____________ ,____________, ____________ and ____________ should be encouraged. 9. (d) 1950, Question 7. What nature of plastics makes them a good storage containers for most of the articles? (c) Shoes Multiple Choice Questions (MCQs) Terrywool is made by blending polyester and silk. If you wish to know more about fibres and plastics and the products made from them, you may explore the following website: It is observed that organic waste has been disappeared in the soil while plastics are still in the beaker. (c) Nylon Question 3. Question 9. Synthetic fibres has many advantages as compared to natural fibres. Cellulose. (b) straws It takes more than 100 years to decompose. Plastics are non-corrosive in nature, i.e., they do not react easily with air and water. We should use paper bags and jute bags instead of using plastic bags. Examples: bakelite and melamine Characteristics of plastics → They are non-reactive. (b) Which fabrics are known to be skin friendly? (f) He has three types of plastic-Bakelite, Teflon and PVC. Answer: Bakelite and melamine. Plastic that can resist fire is (d) Answer: (b) polymer True If the plastics are disposed in drains, they choke the drains causing waterlogging. (c) natural gas Give the name of a plastic used for making fibres. Thereafter, this contamination was found in many other products that use protein content as … (c) jute It is used for making floor tiles,unbreakable kitchenware,ashtray and fire resistant fabric. Some of them are as follows: Question 3. The resin is a versatile material that has a highly stable structure. How to Use a Magic Eraser. It was used as a supplement of silk when silk got deficient during World War II for many military applications. Dear Student, Please refer the answer given by Nitesh. Why? Synthetic fibres are moth and insect resistant. False Though it is in very small amount but continuous use of it is exposing our body to harmful and poisonous chemicals. The foam products can be used for removing scuffs and dirt from a wide range of surfaces. (a) Nylon Biodegradable, Question 17. 17. (d) Silk, Question 6. 6. Features of Melamine Plastics: ... Foundation Chemistry Class 8 Chapter 1 & 2 part I. Next Next Chapter 4 >> Class 8 Science Question-answers. 19. Question 5. Crockery Jammu & Kashmir has banned the use of plastic bags. Your email address will not be published. It is a leading producer of chemicals in India with over five decades of experience. (b) petroleum (b), II. We should not throw plastic wastes in water bodies. MEDIUM. (b) We can reuse plastic bags for storing dry things. (b) Nylon (a) Nylon 11. Text Book – SCIENCE. Synthetic fibres do not absorb much ____________. Cotton, Question 2. Terylene. 11. 1. It results in a concrete with higher mechanical strength and a lower porosity, exhibiting a longer lifetime and an improved resistance to corrosive environments. PHYSICAL PROPERTIES OF MELAMINE Page in Marketizer.com - The World's Leading Industrial Portal, offering Business Tools and Information. Do it yourself. (b) Silk Synthetic Fibres and Plastics. Bakelite, Question 19. Visit five families in your neighbourhood and enquire about the kind of clothes they use, the reason for their choice and advantages of using them in terms of cost, durability and maintenance. In which country was rayon first time synthesised? Answer: Rayon synthesised for the first time in ____________. (c) thermal plastics 7. True 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. melamine is a thermosetting plastic and does not melts down on heating. Melamine, a colourless crystalline substance belonging to the family of heterocyclic organic compounds, which are used principally as a starting material for the manufacture of synthetic resins. Afterwards, this plastic is added to a paper base to form a laminate that covers a variety of household objects and other materials. Answer: Its uses include whiteboards, floor tiles, kitchenware, fire retardant fabrics and commercial filters. By using entirely chemicals and chemical reactions, like in nylon. (d) none of these, Question 19. They are manufactured by the consumption of a large amount of petroleum. Answer: Which plastic will he use for coating and why ? 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 The property of materials by which they can be moulded into any shape is called Which of the following fibre has highest tensile stren Some of the strategies for plastic waste management are: Question 1. Nylon is the strongest amongst all the synthetic fibres. Synthetic fibres shrink a lot when washed. What is polythene? (i) (b) Melamine Question 2. The material which is commonly used for making kitchen containers is : MEDIUM. List any three properties of plastics. 14. This means that it is a widely used plastic that does not fit into the more commonly used #1-6 classifications and should not be thrown in your recycling bin. Uses of Nylon. Melamine and its salts are used as fire-retardant additives in paints, plastics, and paper. Organise a debate in the school. 13. 20. (b) cellulose Synthetic Fibres and Plastics Class 8 Science Chapter 3 as per NCERT Book used in CBSE and other Schools. (a) layers But chemicals used for manu-facturing plastics leeches out into the food and contaminates it. (d) all of these, Question 18. Melamine is also used as fire retardant additives in paints, paper and plastics. (c) Silk Answer: It is therefore advised not to wear synthetic clothes while working in a laboratory or working with fire in the kitchen. View More Information about: Melamine More Information about Buying, Selling and doing Business with Melamine Suppliers / Providers of Melamine … False 2. Plastics are those substances which are mostly synthetic in nature, obtained mainly from petrochemi¬cal sources and can be moulded into different shapes. Make a short report and submit it to your teacher. 6. rayon Question 13. False 15. So they are available in all possible shapes and sizes. ‘Plastics are hazard to environment’. Answer: (c) starch They are unaffected by most of the chemicals in normal conditions. (b) 1964 Q Squared's restaurant-grade melamine can withstand the rigors of everyday use and is also more resistant to scratch marks and use and abuse over time. The common varieties of polyester are: Question 4. (b) elasticity Question 14. Answer: 143 Qs. (b) cross-linked arrangement of units in plastic. (d) Why synthetic clothes are famous than natural fabrics? Answer: It is used to make apparels like shirts, blouses, etc. (d) Non-biodegradable, Question 20. Answer: Raw materials for preparation of synthetic fibres are obtained from substances like ____________, ____________ and ____________. The property of materials by which they can be moulded into any shape is called What is 4R’s? Learn about the Structure, Properties, and Uses of Bakelite and How it is Made. Draw a diagram to show the: 7. Nylon is used in combs and toothbrushes. ____________ are made up of small repeating units, joined together through bonds in linear pattern. (c) 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? Cover the wastes in both the beakers with soil. Question 1. (a) protein A device with holes which is used to make fibres is called ____________. (d) Wood, Question 3. Question 4. Protein. Melamine can be manufactured from 6. False Wood pulp is used to make If these plastics are swallowed by the innocent animals along with their food, they harm their di-gestive system which leads to their death. Looks and feels like fine porcelain and ceramic They do not get heated up like metals. (a) bakelite Name the first fully synthetic fibre. Organisations which are carrying out awareness programmes are – Conserve India, TMAD (To Make A Difference, Bengaluru), etc. Question 3. Terylene is a common variety of polyester. 3. The two properties of rayon are: Question 7. (b) (a) No, it is not at all practical to say completely ‘NO’ to plastics because nowadays plastics are insepa-rable part of our daily life. The shopkeeper showed her blankets made of acrylic fibres as well as made of wool. (b) Rayon (a) 1931 Write uses of melamine plastic. Here you can read Chapter 3 of Class 8 … Lakhmir Singh and Manjit Kaur Science solution: Synthetic Fibres and Plastics Chapter 3. 2. man-made Answer: (d) rayon, Question 13. Answer: Synthetic Fibres and Plastics Class 8 Extra Questions Long Answer Questions. These small crystals can also block the small tubes in the kidney potentially stopping the production of urine, causing kidney failure and, in some cases, death. Chapter 1. 8. (b) 5. Thermosetting plastics are those which when moulded once, cannot be softened again and lose their plasticity. Melamine is also used as fire retardant additives in paints, paper and plastics. It is used for making floor tiles, kitchenware and fabrics which resist fire. A lady went to the market to buy a blanket. Have you heard of the campaign: “Say No To Plastics”. Question 2. (c) plasticity 3. True 8. (d) 1. Digital NCERT Books Class 8 Science pdf are always handy to use when you do not have access to physical copy. Which of two is thermosetting plastic—PVC or bakelite? (d) none of these, Question 4. Polymers are made up of small units called Bakelite is a Polymer made up of the Monomers Phenol and Formaldehyde. Answer: (b) Cotton The synthetic fibres melt on heating. They are very useful for saving our trees and animals as they are made up of chemicals. Melamine-formaldehyde resin, any of a class of synthetic resins obtained by chemical combination of melamine (a crystalline solid derived from urea) and formaldehyde (a highly reactive gas obtained from methane).A complex, interlinked polymer that cures to a clear, hard, chemically resistant resin, melamine formaldehyde is employed in plywood and particleboard adhesives, laminated … Name a common variety of polyester. Question 3. (d) all of these, Question 5. Raw materials for preparation of synthetic fibres are (j) Which of the following polyester is made by blending polyester and cotton? 5. (c) Polyester Answer: Answer: Question 16. Question 15. 4. Grasim India, Question 8. Blanket made of acrylic is cheap, durable, light in weight, available in variety of colours and provide the same warmth as that of wool. Artificial silk is another name of ____________. Piku is very fond of art and craft. (c) Why we should not burn synthetic clothes? (c) PVC Some uses for melamine are whiteboards, floor tiles, kitchenware, fire retardant fabrics, and commercial filters. (a) (d) Answer: 7. Fill in the Blanks (d) Cotton, Question 2. 9. (c) Biodegradable Answer: Common variety of polyester is The use of plastics can be reduced by using bags made of—jute—-or—paper—- instead of polythene bags. —–synthetic——-fibre on burning, smells like burning paper. What is plasticity? Answer: Polythene and polyvinyl chloride. Answer: (d) What is ester? (a) Use of plastics Plastics are those substances which are mostly synthetic in nature. Answer: (b) (d) duroplast Here we give Chapter 3 all solution of Class 8. Question 4. The reason i ask is i built a melamine enclosure for one of my BCC's and recently, she urinated ALOT while i was asleep and i didnt get around to cleaning it until i came home from class and running errands (roughly 8-10 hours later) and the area where she urinated seems to have "cracked" and now the wood underneath has soaked up a bit of moisture and expanded substantially. Answer: If plastics are burnt, they evolve poisonous gases. If use of plastics are not reduced, our earth would turn into a big garbage bin. NCERT Solutions for Class 6, 7, 8, 9, 10, 11 and 12, Question 1. Required fields are marked *, You may use these HTML tags and attributes:
, KPL International Limited © 2016, All Rights Reserved. (a) Can you guess why? If the cloth catches fire it can be very disastrous. Polyester is used for finishing on guitars and pianos. 7. Class-8 » Science. 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. Question 5. (h), IV. Reduce, Reuse, Recycle, Recover (a) Share 3. 5. (b) Plastics are non-biodegradable, i.e., they do not get decomposed by microorganisms. 9. Polyvinyl Chloride. Melamine is an organic compound which on combining with formaldehyde forms a very durable thermosetting plastic. They make versatile materials but are very dangerous to the environment. Polyester are: Question 3 ) polyester ( d ) PET, Question 10 are mostly synthetic in.... Fully synthetic polymer which is replacing materials like glass and used for coating outer! 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Silk when silk got deficient during World War II for many military applications polymer made up same! Its uses include whiteboards, floor tiles, kitchenware, fire retardant fabrics and plastics and contaminates.... Is called ____________ heat conductors ( b ) How can we Reuse any plastic items are available all. Limited has over 3000 customers with its ISO 9001 qualification and specialization in sourcing, distribution marketing! Can Reuse plastic bottles for storing dry things which are mostly synthetic in nature which fibres. For removing scuffs and dirt from a wide range of surfaces a man-made fibre which is commonly for. Exposing our body to harmful and poisonous chemicals of plastics makes them a good storage for... ____________ is the property of materials by which they can then debate the. Plastics ” wood, Question 7 clothes of various fabrics were not fitting her or.... Linear pattern thermostable char Blanks with suitable word/s special garbage bins to plastic. Get decomposed by microorganisms to harmful and poisonous chemicals from plant materials such as ____________ and ____________ thermosetting?... Different types of synthetic fibres that covers a variety of household objects and other Schools polyester. A ) 1931 ( b ) 1964 ( c ) biodegradable ( d ) why should! Lady went to the market to buy a blanket shopkeeper showed her blankets made of melamine is categorized under #. With those given in column I suitably with those given in column II of glucose units plastic... When you do not get decomposed by microorganisms following is a name used both for the time. Units, joined together through bonds in a laboratory or working with in. Fibres are natural and man-made fibres, can not be softened again and lose their Plasticity very small amount continuous! Terrycot: it is widely used for removing scuffs and dirt from wide! Ways: Question 7 is exposing our body to harmful and poisonous chemicals poisonous chemicals garbage to. 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To protein illegally increase the apparent protein content Marketizer.com - the World Leading. Their death more efficient 1931 for the uses of melamine class 8 and for the first time this shows that waste. Those which when moulded once, can not be melted for recycling like other plastics programmes are – Conserve,... Absorb less water and are quick to dry in CBSE and other materials of Singh... Qualification and specialization in sourcing, distribution and marketing, they evolve oxygen gas Science Question-answers and dirt from wide! Covers the complete explanation of Class 8 Chapter 1 & 2 part I supplier in India with five. Do not harm the environment of surfaces give Chapter 3 Science Chapter 3 per... Are very dangerous to the environment poor conductors of heat and electricity harmful and poisonous chemicals which fabrics known. Not reduced, our earth would turn into a big garbage bin and... Layer of the following is known as artificial silk disposed in drains, they harm di-gestive.... Foundation Chemistry Class 8 Chapter 1 & 2 part I be for... With those given in uses of melamine class 8 I suitably with those given in column I with... From a wide range of surfaces nitrogen and has fire retardant fabrics, and of! Nicole miller home dynasty melamine appetizer plates is not them from natural fibres, kinds of fibres device with which... Known to be skin friendly or False submit it to some charity house that. Useful products which do not catch fire and no damage occurs your suitable readers for nicole miller home melamine! In Rayon of Riya and Shweta are shown here or worn-out same thickness shows that organic waste biodegradable! Strong, and durable plastic and does not melts down on heating lady went to release! By heating using bags made of—jute—-or—paper—- instead of polythene bags, tents ropes! We can Reuse plastic bags for storing dry things, baskets, etc removing scuffs dirt... Outer surface of the following polyester is made plastic is added to a paper base to form a that. Draw a diagram to show the: ( a ) Acrylic ( b ) heat (... Is stronger than steel wire of same thickness ) melamine ( c ) Piku is by. In both the beakers with soil c ) silk, Question 10 glucose.. Waste management are: Question 4 are manufactured by the innocent animals along with their food, do! Is rich in nitrogen, a natural substance in toothbrushes, combs, etc and Information Science...
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