Question 4 Name a popular polyester? They cannot be decomposed by bacteria and so are no biodegradable in nature. Ans: The following three steps can be taken to reduce the danger that plastics pose to the environment:(i) Do not throw plastic bags in the water bodies or on the road. LONG-ANSWER QUESTIONS: Answer in about 60 words. This makes it stronger and easy to dye. Does this imply that it is a polymer? It is a strong fiber and consequently can withstand strong and repetitive movements. 6. 3) They are light weight,long lasting and extremely fine. Give two examples each of natural and synthetic fibres. 4. Terylene is a popular polyester fibre.The chemical compounds used in making polyester fibres are made from petroleum products called petrochemicals. Give three uses of polyester, and explain the reason for each use. Add your answer and earn points. Acrylic: They do not get rusted when exposed to moisture and air. Buckets made of iron get rusted but those made of plastic are not rusted. Do you think rayon when burnt will stick to the body like other synthetic fibres? Give two examples of each. 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. Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. […] Teflon coated pans are used instead of metallic as it doesnot react with chemicals in the food. 5. Natural fibres are mixed with polyester to make blended fabrics. 6. Your email address will not be published. Give one use of plastics linked to each of these properties. Ans: Thermosetting plastics are kind of plastic which once moulded cannot moulded again by heating. Answer: Cotton Question 2. 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. Ans: Clothes purely made of synthetic fibres are not comfortable to wear so they are mixed with natural fibres. All Plastics have one common property that they are made up of polymers. Discuss the reasons for this. Why? Polyester is used for making sails of sailboats. List three steps you can take to reduce the danger that plastics pose to the environment. These days clothes made out of a mixture of synthetic fibres and natural fibres are more popular than those made purely out of synthetic fibres. NCERT Solutions Class 10 Science (Physics,Chemistry, Biology). At the free end suspend a pan so that weight can be placed in it. (ii) Polyester : Though polyester is light weight, it is strong and has a good elasticity. List two disadvantages of synthetic fibres. Next Next Chapter 4 >> Class 8 Science Question-answers. 4) It is used for making sails of sail-boat. 5) It is used for … Name the basic component of animal fibres. Your email address will not be published. Ans: Plastics are nonreactive. Required fields are marked *. They last much longer than any other material. Question 11 Why synthetic fibres have become very popular these days? (a) Cotton(b) Nylon(c) Acrylic(d) PolycotAnswer:(a), Question 4.Out of the following, which is not a natural fibre ? Tabulate the data as shown in Table 3.1. Clay is a mixture of compounds. (ii) Take a cotton carry-bag or a jute bag while going for shopping. Moreover, mixing synthetic fibres with natural fibres enhances their properties, such as strength, elasticity and ease of washing and ironing, 4.
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