Q.1 difine Synthetic fibre and write its properties
Q.2• explain why Rayon is known as artificial
silk write its uses.
Q.3. Write the properties and uses of nylon
Q.4. write properties & uses of polyster&
acrylic
Q.5 What are plastic? differentiate between
thermo Settings plastic
with example
Q.6.differentiate between monumers&
Polymer with diagram
Q.7. Write properties and uses of the
follwing 1. Polythene 2• P.V.C 3. Polystyreme
04. Teflon 5. bakelite 6. Melamile
Q.8. write advantages & disadvantage of
Plastic
Q.9 Write a short note on plastic & environment
Q.10 explain 4R principle
Answers
Answer:
It started with the establishment of the Mysore Iron Works (now known as Visvesvaraya Iron and Steel Plant) at Bhadravati in 1923. It was established under the supervision of Sir M Visvesvaraya. Mysore Iron Works was the first public sector steel plant in the country
Answer:
Ans 1) Fibres are fine filaments that either occurs naturally or can be synthesized. Synthetic fibres are man-made fibres produced from chemical substances and are used for making clothes and other useful things. These are made by the process of polymerization.Characteristics of Synthetic Fibres
Synthetic fibres are cheaper than natural fibre.
Synthetic fibres are stronger than natural fibre.
Synthetic fibres are more durable than natural fibre.
Synthetic fabrics are dried up in less time.
Synthetic fibres are easy to maintain and wash.
Ans 2) Rayon is a synthetic fiber or man-made fiber or artificial fiber as it is prepared from the natural raw material called cellulose. ... The kind of rayon fibers which imitate the feel and texture of natural silk is therefore termed as 'artificial silk'.
Ans 3) Nylon fibers are exceptionally strong and elastic and stronger than polyester fibers. The fibers have excellent toughness, abrasion resistance, and are easy to wash, and to dye in a wide range of colors. The filament yarns provide a smooth, soft, and lightweight fabric of high resilience.
Ans 4)) Polyester is very durable: resistant to most chemicals, stretching and shrinking, wrinkle resistant, mildew and abrasion resistant. Polyester is hydrophobic in nature and quick drying.Polyester is generally used in carrying materials, making flexible and lightweight covers such as tarpaulin. It is basically used everywhere ranging from utensils to carry bags. Acrylic is the synthetic replacement of wool, you can use acrylic everywhere wool is used.
Ans 5)) The primary difference between the two is that Thermoset is a material that strengthens when heated, but cannot be remolded or heated after the initial forming, while thermoplastics can be reheated, remolded, and cooled as necessary without causing any chemical changes.Plastics is the term commonly used to describe a wide range of synthetic or semi-synthetic materials that are used in a huge and growing range of applications. ... The raw materials used to produce plastics are natural products such as cellulose, coal, natural gas, salt and, of course, crude oil.
Ans 6)) All monomers have the capacity to form chemical bonds to at least two other monomer molecules. Polymers are a class of synthetic substances composed of multiples of simpler units called monomers. Polymers are chains with an unspecified number of monomeric units.
Ans 8) The advantages of plastics: It is durable, low cost, water resistant, lesser energy and heavy chemicals requirements in manufacture and are light weight. ... The disadvantages of plastics: Plastics bags are make of a non-renewable resource, which gives us more reasons to use recyclable shopping bags.
Ans 9)) Plastic pollution is the accumulation of plastic objects and particles (e.g. plastic bottles, bags and microbeads) in the Earth's environment that adversely affects wildlife, wildlife habitat, and humans. Plastics that act as pollutants are categorized into micro-, meso-, or macro debris, based on size.
Ans 10)) The 4R means Reduce, Reuse, Recycle and Restore. (i) Reduce: We should reduce the use of non-biodegradable compounds that are harmful to us. ... (ii) Reuse: We should reuse the materials instead of dumping them. Example: Plastic bags can be reused to make decorative things.
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