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Important questions based on NCERT syllabus for Chapter 3 - Synthetic Fibres and Plastics:
Question-1: Write a short note on properties of plastics.
Solution: Plastics are light, strong and durable. They are also non - reactive towards chemicals. They are poor conductors of heat and electricity, cheap and easy to handle. Because of all these properties, plastics are used in making many number of products.
Question-2: Manufacturing synthetic fibres is actually helping conservation of forests’. Comment.
Solution: Forests are a necessity for the survival of living beings. Not only do they provide a green cover that prevents soil erosion, it also converts the carbon dioxide to oxygen which is required by us for Respiration. Forests provide many important raw materials from which we make various useful items.
Many things which were earlier made from forest products are now being made from synthetic fibres. For example; plastic chairs have replaced wooden chairs in a big way. Similarly, wooden cartons and crates have been replaced by plastic cartons and crates. The way plastic has replaced wood from many items, it is definitely minimizing the need to cut forests. Thus, it can be said that manufacturing synthetic fibres is actually helping conservation of forests.
Question-3: Write down the properties of plastic which make it a material of choice.
Solution: The properties of plastic which make it a material of choice are:
Plastic is non-reactive and durable.
Plastics are good insulators, light weight and have good strength.
They are available at relatively lower prices and are easy to handle.