The name of two synthetic fibres are: Rayon, Nylon. 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. Bakelite can be used to make old telephones, desks, radios, billard balls, lamps and clocks and many other useful household items. Now coming to the uses of Bakelite, since this element has a low electrical conductivity and high heat resistance it can be used in manufacturing electrical switches and machine parts of electrical systems. 20) What is polyester ? (c) Bakelite is used for making handles of frying pans. Its help you to complete your homework. (ii) It is used … This makes it stronger and easy to dye. Fibres possess high tensile strength because the chains possess strong intermolecular forces such as hydrogen bonding. MCQ Questions for Class 8 Science: Ch 3 Synthetic Fibres and Plastics. Plastic containers do not react with items stored in it. Ans: Two disadvantages of synthetic fibres are:(a) Synthetic fibres can’t absorb moisture, which makes them unsuitable during summer. Ankit was learning how to cook. A polymer used … 10. Because Bakelite is easily shaped it is used in many different ways and in many different shapes and sizes. 3. Ans: Teflon is used for giving non-stick coating on cook wares. Epoxy Resin: These are a class of polymers which contain epoxide groups. It is used for making electrical switches, electric plugs and plug boards, etc. Nowadays, Bakelite has been replaced by more modern plastics, and may be the first plastic to achieve vintage status. Why? 2) It is harder than other plastics. Uses: It is used for the packaging of delicate materials like electronic items. Ans: A Plastic is a synthetic materials which can be moulded into desired shape when soft and hardened to produced a durable article . There more than 100 questions with answers based on Class 8 Science Chapter 3 NCERT Textbook. (adsbygoogle = window.adsbygoogle || []).push({}); Lakhmir Singh and Manjit Kaur Science solution: Synthetic Fibres and Plastics Chapter 3. These are generally used … Bakelite also acted as a binder for textiles, sawdust, and paper, forming a wide range of composites including Formica laminates. Learn more about the uses of polymers at vedantu.com. It is used for making gaskets, pump packings, valves, seals etc. A synthetic fibre classified as polyester (8) 7. Why do we use melamine for making kitchenware? Check the below NCERT MCQ Questions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics with Answers Pdf free download. Uses: It is used to make electrical goods, combs, fountain pens, buttons, plugs and switches. List two disadvantages of synthetic fibres. Owing to its resistance to heat, electricity, and chemical action, today, Bakelite is used to make: Bases and sockets for light bulbs. (b) The properties and uses of polystyrene are as follows:Properties: 1) It can be easily moulded.2) It has poor chemical resistance. Substance made up of large number of smaller molecules (7) 4. → It is widely used in various industries and for making a variety of household articles. Avoid the use of plastics as far as possible. 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. Rayon – A Types of Synthetic Fibres. 3. 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. Due to this, thermosetting plastics do not become soft on heating . Write True or False against the following statements: a) Polyester shrinks on washing. Careless disposal of plastic bags, chokes, drains and blocks the soil. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. The articles made of plastic are non-biodegradable, so they don’t decompose easily. MySQL Connector/NET 8.0 API Reference. These phenolic and bakelite are of Grade A quality and come in a liquid-like appearance. 5. Answer – Saucepan handles are made of thermosetting plastics because thermosetting plastics are poor conductor of heat. Add weight one by one till the thread breaks. 33) Explain the difference between thermoplastics and thermosetting plastics ? Save my name, email, and website in this browser for the next time I comment. NCERT Solutions; _Class 6; _Class 7; _Class 8; ... Bakelite (d) Polyester (a) Polypropylene. List and explain four properties of plastics. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. NCERT Exemplar Class 8 Science Chapter 3 Synthetic Fibres and Plastics. 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. Uses of Bakelite : (i) It is used for making electrical switches and plugs. The molecules set the way batter sets in a … It is used for making gaskets, pump packings, valves, seals etc. for making a number of medical instruments. give reasons for your answer ? 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. 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. 1 Pick the synthetic fibre out of the following. Plastic pollution, harmful accumulation of synthetic plastic products in the environment. Bakelite was first used as insulators against heat and electricity. Uses of Bakelite. Ans: Clothes made of synthetic fibres are not suitable for wearing during hot summer. Uses It is used in making bottles. Ans: Any material which can be melded into any desirable shape on heating is called plastic. MySql.Data.MySqlClient. 6)Name the fibre used for making parachutes and rock climbing ropes. But we wear many dresses which are not made from silk, but they appear to resemble silk. 42) Write some of the uses of plastic in healthcare industry. Save my name, email, and website in this browser for the next time I comment. d) Bakelite is a thermoplastics plastics. 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: Plastics are nonreactive. Insulation of wires, brake pads, and some select automobile parts. 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