MySqlBulkLoader Properties. → They are used to store various kinds of materials such as food items, chemicals etc. We should reuse the plastic containers which comes with jams, pickels, oils and other packed food. So never put your Bakelite handled lids in the oven. Synthetic fibres are also called ……….. or ………. c> Like synthetic fibres, plastic is also a POLYMER. Due to this, thermosetting plastics do not become soft on heating . Therefore, these type of clothes are not suitable in a kitchen. A polymer used … Viscose is forced to pass through the tiny holes of a metal cylinder into a solution of sulphuric acid when a silk like thread of rayon is formed. 2. 1> This plastic which once set, does not become soft on heating and cannot be moulded a second time. Melamine is used for making floor tiles, kitchenware etc. 4. Discuss the reasons for this. Acrylic fibre is made from a chemical called ‘acrylonitrile’ by the process of polymerisation. Can you write the major difference between these two types of plastics? Q7. 28) What are plastics ?  Name five commonly used articles made of plastics ? There more than 100 questions with answers based on Class 8 Science Chapter 3 NCERT Textbook. A synthetic fibre classified as polyester (8) 7. Electric plugs/switches/plug boards are made of thermosetting plastics because they are bad conductors of electricity. Fishing nets are made from— nylon —. Bakelite is still manufactured, however, and is used for pot handles and jewelry. Text Book – SCIENCE. But we wear many dresses which are not made from silk, but they appear to resemble silk. 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 type of fibre obtained naturally from cocoon (4) 6. It is brittle, lacks truly high temperature resistance, and degrades with repeated exposure to boiling water and/or steam. Non-biodegradable : Polythene bags, Aluminium cans, Toothbrush, Electric switch, Frying pan handle. If you feel revision, please visit to Important Questions or NCERT Solutions links given just below to each question. 6. 4) Name the fibre obtained by the chemical treatment of wood pulp (or cellulose). 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. Jewelry. We should not throw polythene bags,  wrappers of chips, biscuits and other eatables in water bodies, on the roads, or picnic spots. NCERT Solutions Class 10 Science (Physics,Chemistry, Biology). Ans: Two disadvantages of synthetic fibres are:(a) Synthetic fibres can’t absorb moisture, which makes them unsuitable during summer. 25) Why should we not wear clothes made of synthetic fibres (like nylon or polyester) while working on the kitchen ? 1 Pick the synthetic fibre out of the following. It is used for making electrical switches, electric plugs and plug boards, etc. Two example of each type of plastics are given below : 30) Why are thermoplastics not used for making frying pan handles ? All the 20 sets of online tests are free to use again and again. Chapter – 3.  Making bandages, syringe and some another surgical dressings. The name of two synthetic fibres are: Rayon, Nylon. for example : Bakellite , melanin, Formaldehyde Thermoplastic Plastic are kind of plastic which can be moulded again and again by heating and easily reused.For example :PVS, Polysterine , nylon , polythine. Plastics are persistent large-scale pollutants, and plastic debris (such as bottles, straws, containers, and plastic wrap) and particulates have been found in many environmental niches, from Mount Everest to … Name the popular polyester ? Believe it or not, from a chemist's perspective all these things are made of the same class of materials: Polymers. Here you get easy solutions of Lakhmir Singh and Manjit Kaur Science solution Chapter 3 . We have provided Synthetic Fibres and Plastics Class 8 Science MCQs Questions with Answers to help students understand the concept very well. Bakelite is a poor conductor of heat and electricity. 17) State the characteristics of synthetic fibres. It is used for making the handles of various cooking utensils(fry pans,pressure cooker) because. b> if the plastic bags thrown carelessly, the animals will eat up along with the left over food and vegetables and that plastic wastes choke the respiratory system   or lining in their stomach. Science Class 8- Chapter 3- Synthetic Fibres and Plastics- NCERT Exercise Solutions (Question-Answer) ... Melamine, bakelite. 3> they are readily available and easy to maintain. Biodegradable and non-biodegradable wastes should be separated and disposed off separately. It is also used to make various kitchenware products like frying pans etc. Substance made up of large number of smaller molecules (7) 4. Why? (d) The properties and uses of bakelite are as follows: Properties: 1) It is a good electrical insulator. A plastic used for making containers and carry bags (9) 3. Ans: A Plastic is a synthetic materials which can be moulded into desired shape when soft and hardened to produced a durable article . It is used for making gaskets, pump packings, valves, seals etc. 45) Explain how , the use of plastic has a a bad effect on the environment ? Does this imply that it is a polymer? They do not decompose when left in open for a long period. Nowadays, Bakelite has been replaced by more modern plastics, and may be the first plastic to achieve vintage status. 2) It is harder than other plastics.Uses: It is used to make electrical goods, combs, fountain pens, buttons, plugs and switches. Reference. "The Material of a Thousand Uses" Bakelite's properties make it suitable for several uses including a molding compound, binding agent, varnish, and protective coating. Bakelite being thermosetting plastic can be used for insulating materials It is used in ceramic, wood, leather, paper, metal, and glass. Answer – Saucepan handles are made of thermosetting plastics because thermosetting plastics are poor conductor of heat. Which property of plastics makes them so useful but also makes them an environmental hazard? Bakelite is a thermoset plastic, meaning that its polymer chains are hooked together through the heat and pressure applied when it is molded. Plastic bags can also contaminate foodstuffs due to poisonous dyes getting absorbed into food. Plastic containers do not react with items stored in it. 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. Give two examples each of natural and synthetic fibres. Name of the popular polyester is terylene. 1. As ways were found to manufacture Bakelite in bright colors, it began to be used for all sorts of decorative objects, especially jewelry. A synthetic fibre classified as polyester (8) 7. But clay is not a polymer because polymers are made up of monomer units while clay is not made up of monomer units. Biodegradable : Woolen clothes, paper, peels of vegetables and fruits, cotton clothes, jute bag. It was crafted into rotary-dial telephones, radios, electric guitars, appliance parts, door knobs, bangles, and more. —–synthetic——-fibre on burning, smells like burning paper. It is also used to insulate the hollow walls of the refrigerator. Explain why the following are made of thermosetting plastics. 5. Tabulate the data as shown in Table 3.1. 2) It does not react chemically with other substances. 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