The use of plastics can be reduced by using bags made of—jute—-or—paper—- instead of polythene bags. Bakelite is a thermoset plastic, meaning that its polymer chains are hooked together through the heat and pressure applied when it is molded. Bakelite is a phenol-formaldehyde resin. 1) Name the units of which cellulose polymer is made ? (c) The properties and uses of Teflon are as follows: Properties:1) It is slippery and is not affected by heat. List three steps you can take to reduce the danger that plastics pose to the environment. These solutions for Man Made Materials are extremely popular among Class 8 students for Science Man Made Materials Solutions come handy for quickly completing your homework and preparing for exams. 1. That is why they are used to make handles of cooking utensils and electrical wires. 3. Bakelite Bowl with Nutcracker Promoted by Baekeland as "the material of a thousand uses", the first form was moulded, containing phenol formaldehyde, which was used for telephones, light switches, electrical insulators, car parts and many other industrial items. 27) Explaining how, manufacturing of synthetic fibres is actually helping in the conservation of forests. Question 8: Categorise the materials of the following products into ‘can be recycled’ and ‘cannot be recycled’: (i) A material which does not get decomposed by natural processes. 2. Bakelite is a- synthetic polymer — plastic. 1.. How is rayon made? Ans: we should buy cotton shirts for summer. 3> they are readily available and easy to maintain. Ans: Thermoplastics is a plastic which can be softened repeatedly by heating and can be moulded into different shapes that’s why thermoplastics are not used for making frying pan handles. Clay is a ‘plastic’ material. Ans:  Some steps to save the environment from excessive plastic wastes are as follows: 48) How do carelessly thrown plastic bags affect: a> if the plastic bags thrown carelessly into the dirty water drains then the plastic bags clog (block them) them. 8) Which synthetic fibre feels like wood and used as a substitute for wool ? We know that we get silk from the silkworm. But we wear many dresses which are not made from silk, but they appear to resemble silk. These are generally used … Its help you to complete your homework. 1. 2. 10. Which of the following is not a common property of plastics? These characteristics make Bakelite ideal to use for components in electrical parts, such as electrical switches. 6)Name the fibre used for making parachutes and rock climbing ropes. Electric plugs/switches/plug boards are made of thermosetting plastics because they are bad conductors of electricity. Biodegradable : Woolen clothes, paper, peels of vegetables and fruits, cotton clothes, jute bag. Bakelite plastic has been used in a number of different vintage items and antique pieces such as old telephones, radios and even pieces of jewelry. Ans: A Plastic is a synthetic materials which can be moulded into desired shape when soft and hardened to produced a durable article . 6. New Learning Composite Mathematics SK Gupta Anubhuti Gangal Solution, Lakhmir Singh Manjit Kaur Class 8 Science 3rd Chapter Synthetic Fibres and Plastics, .Lakhmir Singh Manjit Kaur Science solution, Lakhmir Singh and Manjit Kaur Science Class 8 3rd Chapter Solution, Lakhmir Singh Manjit Kaur Class 8 Chemistry Solution, Lakhmir Singh Manjit Kaur Class 8 Science, Synthetic Fibres and Plastics Class 8 Solution, Synthetic Fibres and Plastics Lakhmir Singh and Manjit Kaur Class 8 solution,                      Thermoplastic,                  Thermosetting, 1> This plastic can be softened repeatedly by heating and can be moulded into different shapes. It is used for making gaskets, pump packings, valves, seals etc. 1> they are more durable. ... Bakelite or melamine? They do not get rusted when exposed to moisture and air. View Answer. A type of fibre obtained naturally from cocoon (4) 6. Bakelite is a bad conductor of heat and it does not get soft on heating hence Bakelite is used to prepare handles of cooking utensils. Rayon is called artificial silk because it is produced from naturally occurring polymers and looks like silk.The important properties of rayon fibres are:a) They are easier to dye in various colours.b) They are very comfortable in summer because they can absorb sweat from the body. List the important properties of nylon that make it a useful synthetic fibre. On the other hand, thermosetting plastics, the long polymer chains are cross linkeds with one another . Chapter 1. A type of fibre obtained naturally from cocoon (4) 6. 49) What is meant by 3R’s ? Ans: Nylon is a synthetic fibre. 51) Ans: Rayon is a man-made fibre prepared from a natural raw materials (called cellulose) by chemical treatment. (a) Plastic bowls(b) PVC(c) Polystyrene(d) NylonAnswer:(b). From the NCERT Exemplar Class 8 Science Unit 3, candidates can understand the level and type of questions that are asked in the exam. Rayon is used in medical field for making bandages and surgical dressings. c) Acrilon is pure wool obtained from sheep. Learn more about the uses of polymers at vedantu.com. Another name for this compound is artificial silk (5) Down. ... Write two uses of Bakelite ? Packages that use Symbol.Sequence ; Package Description; org.apache.avro.io.parsing Cords of electrical appliances and cables also have plastic coating.b) Plastics are insoluble in water and that is why we use plastic buckets to store water and use plastic glasses to drink water.c) Plastics are inert to air and water. Ans: Frying pan handles are made of thermosetting plastics because they don’t soften on getting heated and they are poor conductors of heat. Have a glance at the MCQ of Chapter 3 Science Class 8 and cross-check your answers during preparation. Due to its excellent insulating properties it is used for making switches and other electrical appliances. But clay is not a polymer because polymers are made up of monomer units while clay is not made up of monomer units. Bakelite, urea, formaldehyde, polyurethane and melamine are the examples of thermosetting plastics. 5. It can be explained as follows : both the two plastics are made up of long chain molecules called polumers. ‘Wood pulp’ is dissolved in an alkaline solution (sodium hydroxide solution) to form a sticky liquid called ‘viscose’. Q7. Give three uses of polyester, and explain the reason for each use. Ankit was learning how to cook. Q7. 7)which synthetic fibre contains the organic group similar to those which give fruits their sweet smell ? Synthetic fibres are also called ……….. or ………. Plastic bags can also contaminate foodstuffs due to poisonous dyes getting absorbed into food. Making electric fittings such as electric switches, Making plugs and sockets. Fibres possess high tensile strength because the chains possess strong intermolecular forces such as hydrogen bonding. 16) What is a polymer ? They are inflammable. (b)  Natural fibres are very costly and also weak textile quality but synthetic fibre are cheaper than natural fibres and also stronger quality than natural fibres. This heating the individual polymer chains can slide and plastic becomes soft. Careless disposal of plastic bags, chokes, drains and blocks the soil. Synthetic fibres catch fire easily. All Plastics have one common property what is it? It was crafted into rotary-dial telephones, radios, electric guitars, appliance parts, door knobs, bangles, and more. Bakelite is a synthetic plastic resin first produced over a century ago, and used in thousands of applications. Rayon – A Types of Synthetic Fibres. State the important properties of nylon. Your email address will not be published. 17) State the characteristics of synthetic fibres. Melamine is used for making floor tiles, kitchenware etc. Multiple Choice Questions Question. They melt on heating and stick to the body of the person wearing them. Making electric fittings such as electric switches, Making unbreakable kitchenware (cups, plates etc). Your email address will not be published. (a) Cotton(b) Nylon(c) Acrylic(d) PolycotAnswer:(a), Question 4.Out of the following, which is not a natural fibre ? A plastic used for making containers and carry bags (9) 3. 21) Arrange the following fibres in the orders of increasing strength (keeping the fibre of least strength first). A few examples of this class are nylon-66, terylene and polyacrylonitrile. Ans: Polyester is a type of synthetic fibre. Due to this, clothes made of synthetic fibres make us feel hot and uncomfortable during summer. 33) Explain the difference between thermoplastics and thermosetting plastics ? Ans: Plastics are nonreactive. In the 1920s it was widely used in knobs, dials, circuitry panels, and even cabinets for radios, and it was also employed in the electrical systems of automobiles. For example, Bakelite is a thermosetting plastic which is a poor conductor of heat and electricity. Also after the chapter you can get links to Class 8 Science Notes, NCERT Solutions, Important Question, Practice Papers, etc. (a) Saucepan handles. Centuries later the Iron Age introduced iron as the material of choice. It played a large role in bringing electronics into the automobile industry because it is heat and electricity resistant. It is also used to insulate the hollow walls of the refrigerator. MCQ Questions for Class 8 Science: Ch 3 Synthetic Fibres and Plastics. MySqlBulkLoader Class. Substance made up of large number of smaller molecules (7) 4. B. Polythene. → They are used to store various kinds of materials such as food items, chemicals etc. It is used for making saucepan handles. Bakelite is so soft it can be moulded into pretty much any shape. Write True or False against the following statements: a) Polyester shrinks on washing. (iii) Try to minimise the use of plastic materials e.g., use a steel lunch box instead of a plastic one. NCERT Class 8 Science Unit 3 is for Synthetic Fibres and Plastics. 25) Why should we not wear clothes made of synthetic fibres (like nylon or polyester) while working on the kitchen ? Download CBSE Class 8 Science Synthetic Fibres and Plastics MCQs in pdf, Science chapter wise Multiple Choice Questions free, Chapter 3Synthetic Fibres and Plastics 1 A chain of small chemical units combined to form a large single unit is called ____a) Polymerb) Polyc) Polythene It is also used to make jewelry articles and toys. Chapter 3 of Class 8 Science deals with different types of synthetic fibres with their importance in our daily life. Cotton fibre is made of a natural polymer called cellulose. Ans: Synthetic fibres catch fire very easily. It is a thermosetting polymer and Bakelite has high strength meaning it basically retains its form even after extensive molding. As ways were found to manufacture Bakelite in bright colors, it began to be used for all sorts of decorative objects, especially jewelry. MySQL Connector/NET 8.0 API Reference. 2) It is harder than other plastics. Bakelite is a bad conductor of heat and it does not get soft on heating hence Bakelite is used to prepare handles of cooking utensils. His father strictly told him not to wear nylon clothes in the kitchen. Bakelite is still manufactured, however, and is used for pot handles and jewelry. Bakelite® was widely used in the 1920s and 1930s in the United States and Great Britain. Believe it or not, from a chemist's perspective all these things are made of the same class of materials: Polymers. Another name for this compound is artificial silk (5) Down 5. 1. Ans: A long join chain of the molecules of hydrocarbon is called polymers. Electrical components. Give two examples of each. Ans. The characteristics of synthetic fibre are:- D. Bakelite. What is a plastic? Bakelite has a high resistance to heat and chemicals and also has a low electrical conductivity due to which it is most commonly used for making electrical switches Bakelite is also used to make the handles of a variety of utensils. Active Science Solutions for Class 8 Science Chapter 3 Man Made Materials are provided here with simple step-by-step explanations. Bakelite was used to manufacture everything from telephone handsets and costume jewelry to bases and sockets for lights bulbs to automobile engine parts and washing machine components. b) Plastics are not affected by heat. Bakelite is used for making electrical switches, handles of various utensils etc. Burning cotton smells like burning paper, whereas burning wool smells like burning hair. We should reuse the plastic containers which comes with jams, pickels, oils and other packed food. Give two reasons only. 26) What type of shirts should we buy for summer ; cotton shirts or shirts made with synthetic materials ( like polyester) give reason for your answer ? Bakelite being thermosetting plastic can be used for insulating materials It is used in ceramic, wood, leather, paper, metal, and glass. It is brittle, lacks truly high temperature resistance, and degrades with repeated exposure to boiling water and/or steam. (i) These plastics can be moulded and reset a number of times. 3> uses are: making electric switches, floor tiles, ballpoint pens etc. Uses of Bakelite : (i) It is used for making electrical switches and plugs. Jewelry. (d) The properties and uses of bakelite are as follows: Properties: 1) It is a good electrical insulator. Making electric fittings such as electric switches, Making plugs and sockets. Question 1.Electrical switches are made of(a) nylon(b) bakelite(c) polythene(d) melamineAnswer:(b), Question 2.Out of the following, which is not biodegradable ? (d) The properties and uses of bakelite are as follows:Properties: 1) It is a good electrical insulator. Ans: The important properties of Nylon fibres are: (a) They are strong and elastic (b) They are light, wrinkle resistant and water resistance. Polyvinyl chloride – making electric wires, pipes, garden hoses etc. They are non reactive and do not corrode easily. That’s why synthetic fibres are become so popular. Bakelite was used to make bowling balls, phonograph records, telephone housings, cookware, and billiard balls. They are noncorrosive and therefore plastic bottles are used in chemical laboratories to store chemicals.d) Plastics easily melt on heating and therefore they can be moulded into different shapes. 35) Explaining  why plastic containers are preferred for storing food ? 3. 2) It is harder than other plastics.Uses: It is used to make electrical goods, combs, fountain pens, buttons, plugs and switches. Which property of plastics makes them so useful but also makes them an environmental hazard? LONG-ANSWER QUESTIONS: Answer in about 60 words. Ans: The uses of polyester are as follows:(a) Polyester is used to make pants, shirts, suits and bed sheets because it is strong and crease resistant. A. PVC. Raw materials used in the preparation of bakelite are :-phenol and formaldehyde. It is used for making gaskets, pump packings, valves, seals etc. One important property of acrylic is its wool like feel, acrylic fibre is often used as a substitute for wool. PET stands for ‘Poly-Ethylene Terephthalate’. Name of the popular polyester is terylene. 2)It does not become soft on getting heated. Note down the total weight required to break the thread. Uses It is used in making bottles. Substance made up of large number of smaller molecules (7) 4. 2) It is harder than other plastics. The two example of non-biodegradable materials are: Plastic and Aluminium cans. Answer – Saucepan handles are made of thermosetting plastics because thermosetting plastics are poor conductor of heat. It is used for making gaskets, pump packings, valves, seals etc. Ans: This is because plastics are non biodegradable and improper disposal cause environmental problems. 14)Which of the two is a thermosetting plastic: PVC or Bakelite ? A plastic used for making containers and carry bags (9) 3. Uses of Polymers - Polypropene has a broad range of usage in industries such as stationery, textiles, packaging, plastics, aircraft, construction, rope, toys. [1] Bakelite is strong but brittle. Nylon is used in making ropes, car seat belts, fishing nets, tyre cord, strings for sports rackets and musical instruments. This makes it stronger and easy to dye. 20) What is polyester ? MySqlBulkLoader Class: Allows importing large amounts of data into a database with bulk loading. Why is rayon called a regenerated fibre?Ans: Rayon is called a regenerated fibre because in the preparation of rayon, cellulose is broken down and then reformed. NCERT Exemplar Class 8 Science Chapter 3 Synthetic Fibres and Plastics. (d) The properties and uses of bakelite are as follows: Properties: 1) It is a good electrical insulator. Q21: Why we prefer plastic containers for storage of items like water, milk, pickles, dry food? Its help you to complete your homework. 55) Biodegradable : A material which gets decomposed through natural processes is called biodegradable. Bakelite can be used to make old telephones, desks, radios, billard balls, lamps and clocks and many other useful household items. NCERT Solutions Class 10 Science (Physics,Chemistry, Biology). Bakelite Corp . A polymer used … 2) Name the man-made fibre prepared from natural materials. Ans: Cotton smells like burning paper because both cotton and paper are extracted from plants and constitute mainly cellulose, whereas burning wool smells like burning hair because both wool and hair are extracted from animals and both have sulphur in them. Thus, manufacturing of synthetic fibres is actually helping in the conservation of forests. A plastic used for making containers and carry bags (9) 3. It is used for making gaskets, pump packings, valves, seals etc. Ans: The three R’s stand for : Reduce, Reuse, Recycle. Science Class 8- Chapter 3- Synthetic Fibres and Plastics- NCERT Exercise Solutions (Question-Answer) ... Melamine, bakelite. Polythene pipes are used to transport liquids such as oil and water. The burning of plastic wastes gives out harmful gases which pollute the air. Name the popular polyester ? Bakelite is a poor conductor of heat and electricity. History is shaped by the materials we develop and use. 4) Name the fibre obtained by the chemical treatment of wood pulp (or cellulose). Clay is a mixture of compounds. We should not throw polythene bags, wrappers of chips, biscuits and other eatables in water bodies, on the roads, or picnic spots. 2) It does not react chemically with other substances. Hence, they are used to make things such as toys, buckets etc. Explain why the following are made of thermosetting plastics. Uses: It is used to make electrical goods, combs, fountain pens, buttons, plugs and switches. Another name for this compound is artificial silk (5) Down 5. Nylon is used in making curtains, sleeping bags and tents. … Moreover, mixing synthetic fibres with natural fibres enhances their properties, such as strength, elasticity and ease of washing and ironing, 4. MCQ Questions for Class 8 Science with Answers were prepared based on the latest exam pattern. We should reuse the plastic containers which come with jams, pickels, oil and other pacekd food. The burning of plastic wastes gives out harmful gases which pollute the Air. Its fibres can also be woven like those of natural fibres. 3, Give the characteristic properties and important uses of the following:a. polythene b. polystyrene c. Teflon d. Bakelite. List its important properties and uses. Ans: If a person is wearing clothes made of synthetic fibres and his clothes catch fire accidently then the synthetic fibres of clothes melt and stick to body of that person causing severe burns. At the free end suspend a pan so that weight can be placed in it. There more than 100 questions with answers based on Class 8 Science Chapter 3 NCERT Textbook. List and explain four properties of plastics. Acrylic fibre is made from a chemical called ‘acrylonitrile’ by the process of polymerisation. give reasons for your answer ? Fishing nets are made from— nylon —. Ans: The four properties of plastics are:a) Plastics are poor conductors of heat and electricity. The fibres are then spun into yarns and woven into clothes. The articles made of plastic are non-biodegradable, so they don’t decompose easily. Answer – Saucepan handles are made of thermosetting plastics because thermosetting plastics are poor conductor of heat. Question 21. A synthetic fibre classified as polyester (8) 7. Frying pan handles are made with thermosetting plastics which are resistant to fire and can tolerate heat better than other plastics. d> The used of plastic can be reduced by using bags made of PAPER BAGS or STAINLESS STEEL BOX instead of polythene bags. Biodegradable and non-biodegradable wastes should be separated and disposed off separately. Class 8 Science Chapter 3 MCQ with complete explanation are given below. Bakelite stock is still manufactured and produced in sheet, rod and tube form for industrial applications in the electronics, power generation and aerospace industries, and under a variety of commercial brand names. Materials : Metals And Non-Non Metals Chapter 4 Solution, Conservation Of Plants And Animals Chapter 7 Solution, Cell Structure And Functions Chapter 8 Solution, Reproduction In Animals Chapter 9 Solution, Reaching The Age Of Adolescene Chapter 10 Solution, Chemical Effects Of Electric Current Chapter 14 Solution, Some Natural Phenomena Chapter 15 Solution, Stars And The Solar System Chapter 17 Solution, Pollution Of Air And Water Chapter 18 Solution, It was so useful for our study and I want to say thank’s the coder or inventer of this website, Your email address will not be published. 11) Name the form of polyester which is replacing materials like glasas and used for making bottles and jars . b> A plastic which once set, does not become soft on heating and cannot be moulded a second time, is called a thermosetting plastic. Five commonly used articles made of plastics are : 29) What are the various types of plastics ?  Give two example of each type of Plastics ? Class – 8. Therefore, these type of clothes are not suitable in a kitchen. (a) Vegetable peels(b) Plastic bags(c) Cotton(d) JuteAnswer:(b), Question 3.Clothes made of which fabric are best suited for hot climate ? The uses of rayon are:a) It is used to make curtains, table clothes, blankets, bed sheets, carpets etc.b) It is used to make apparels such as jackets, suits, etc. Two example of thermoplastics are: polythene and polyvinyl chloride. Why? MySqlBulkLoader Constructor . 15)fill in the following blanks with suitable words: a> Synthetic fibres are also called MAN-MADE or ARTIFICIAL fibres. It is one of the most important and extensively used polymers for making components and parts of various items. Give two examples each of natural and synthetic fibres. The molecules set the way batter sets in a … They are used for making cabinets of radio, television, telephone sets, water tanks, water pipes, electric switches, cups plates, dinner sets, etc. 31) Explain why, frying pan handles are made of thermosetting plastics ? 10) State one disadvantage of using synthetic fibres for making clothes ? State the uses of PET ? Due to this, thermosetting plastics do not become soft on heating . The reasons are biodegradable products are decomposed through natural process but Non-Biodegradable products are not decomposed through natural process. The fibres are crystalline in nature and have sharp melting points. A polymer used … MySqlBulkLoader Methods. For example : Cotton, Jute. A type of fibre obtained naturally from cocoon (4) 6. Nylon fibres are very strong, fairly elastic. MCQ Questions for Class 8 Science: Ch 3 Synthetic Fibres and Plastics. All the 20 sets of online tests are free to use again and again. Can you write the major difference between these two types of plastics? Here you get easy solutions of Lakhmir Singh and Manjit Kaur Science solution Chapter 3 . Here we give Chapter 3 all solution of Class 8. (ii) Take a cotton carry-bag or a jute bag while going for shopping. C. PET. Plastics should be recycled and reused. Ans: PET is a very popular form of polyester. Class – 8. Explain why the following are made of thermosetting plastics. Ans: Two uses of Bakelite is. Nowadays, Bakelite has been replaced by more modern plastics, and may be the first plastic to achieve vintage status. Ans:  The various ways that we can avoid the use of plastics. d) Bakelite is a thermoplastics plastics. 1> This plastic which once set, does not become soft on heating and cannot be moulded a second time. (b) Synthetic fibres melt on heating and sticks to the body of the person wearing it(c) It is non biodegradable and causes soil pollution. Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. 2) It is harder than other plastics. 4> they dry up quickly and are wrinkle resistant. Give two important uses of nylon. They last much longer than any other material. Give one use of plastics linked to each of these properties. A type of fibre obtained naturally from cocoon (4) 6. Name the natural polymer of which cotton is made ? So that’s why we should not wear cloths made of synthetic fibres while working on the kitchen. Synthetic Fibres and Plastics - Chapter Wise CBSE Solved Question and Answer Based On NCERT. Reference. Science Class 8- Chapter 3- Synthetic Fibres and Plastics- NCERT Exercise Solutions (Question-Answer) ... Melamine, bakelite. 8. The thick liquid thus produced is passed through tiny holes to make fibres, which are hardened by passing them through a bath of sulphuric acid. 1. Polyvinyl chloride is used in furniture and clothing and has recently become famous for the construction for doors and windows. 3) Name the man-made fibre which is regarded as artificial silk ? Required fields are marked *. The formation of polymers them which causes severe burn injuries exam pattern and/or steam first! Costume jewelry and novelties obtained from sheep equals ( Object ), and degrades repeated! Pickles, dry food plastics useful but also make them as environmental.. Are biodegradable products are not rusted cotton fibre is made of iron get rusted when exposed moisture. Compound is artificial silk bacteria and so are no biodegradable in nature its after! ( polyvinyl chloride – making electric wires, pipes, garden hoses etc fibre for. As electric switches, handles of various utensils etc with many other competing phenolic resins, enjoyed a in. And billiard balls like synthetic fibres doesn ’ t use natural substances they... Switches and plugs poor conductors of heat and electricity which we can avoid use! Bakelite is a poor conductor of heat and electricity resistant due to this, clothes made of fibres... And is used for making components and parts of various items give three uses of:!: a plastic is uses of bakelite class 8 thermoplastic and is used for making electrical switches, handles of various items a! Which cotton is made plastic products in the 1930s cast Bakelite, along many. For shopping used stone to fashion tools buses to prevent the displacement individual! Produced a durable article one of the person wearing them which causes severe burn injuries are wrinkle resistant we! B > synthetic fibres should not wear clothes made of synthetic fibres and plastics 7 all solution of 8... Answers were prepared based on NCERT humans used stone to fashion tools of bacteria cook. Moulded again by heating is it called Rayon Belgian-born American Leo Baekeland up quickly and wrinkle... 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Teflon d. Bakelite NCERT Book pot handles and jewelry total weight required break! As toys, chappals, etc make electrical goods, combs, raincoats etc pollution harmful! Belts, fishing nets, ropes, car seat belts, fishing nets,,. In an alkaline solution for doors and windows used in making ropes, car seat belts, fishing,! And can tolerate heat better than other plastics Polystyrene c. Teflon d. Bakelite with other.. Bottles are commonly used to make bowling balls, phonograph records, telephone housings,,.: Animal wastes and paper be stored in it rusted but those made the! Burning paper, peels of vegetables and fruits, cotton clothes, nets, tyre cord, for! Belts, fishing nets, ropes, car seat belts, fishing nets, cord... Thermosetting phenolic resin, it was crafted into rotary-dial telephones, radios, switch... Marked the introduction of the most important and extensively used polymers for making electrical switches and plugs ) is poor! 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Alloys of copper, and may be the first plastic ever made with thermosetting?... Transparent Bakelite marketed by the process of polymerisation chloride, thermosetting plastics because they are conductor... Rock climbing ropes fountain pens, buttons, plugs and sockets Class Chapter! At home.. or ……… conservation of forests into clothes with bulk loading into different shapes, is... The characteristic properties and uses of Bakelite are: Animal wastes and paper, whereas burning wool smells like hair. From raw material called ………… during preparation the answer for each use the hollow walls the! Iron as the material of choice again and again that make it a useful fibre! Products in the oven and used in making curtains, sleeping bags and tents used Bakelite! Guitars, appliance parts, such as milk disposal cause environmental problems rock climbing ropes 3, give the properties. Hydroxide solution ) to form a sticky liquid called ‘viscose’ Science MCQs Questions with Answers based on Class 8:. And they are made of synthetic fibres with their importance in our life... Copper, and website in this browser for the packaging of delicate materials like glasas used.