Answer the following question
Question 1 Explain 4 R?
Question 2 What are fibres? give it's type?
Question 3 Why polyethene is used to making large number of
material:
Question 4 Write a shore note on nylon?
Question 5 Explain the type of polyethene?
Answers
Answer:
1. ans :-
2. ans :- the thin strands of thread that we see , are made up of still thinner strands called fibres . there are two types of fibre : natural fibre and synthetic fibre .
3.
4 ans :- Nylon is a artificial fibre. it is one of the most commonly used in polyameders. it is first used in February 28 , 1935. Nylon make a silky material .
5. ans :there are two types of polythene. they are HDPE (high density polythene )ans LDPE ( low density polythene ) .both have very different physical properties.
Answer:
Ans. 1 - The 4Rs is reduce, reuse, recycle and recover.
REDUCE : We should reduce the use of materials that are harmful to us. Like : We should use paper bags instead of polythene bags.
REUSE : We should reuse things like plastic bags can be used to make decorative things.
RECYCLE : We should give waste things (which cannot be decomposed) for recycling. Like : plastic materials.
RECOVER : If there is still waste left over after we have reduced, reused, and recycled as much as we can, we can use it to make energy at our energy - from - waste (EfW) facility. This process is known as Recovery.
Ans. 2 - Fibres that are obtained from plants or animals are called natural fibres. Examples are cotton, jute, wool and silk. Fibres that are made by man from chemical substances are called synthetic fibres. Examples are nylon, rayon, polyester, and acrylic.
Ans. 3 - Polythene is used to making large number of materials because we pack large number of things in polythene.
Ans. 4 - Nylon is an artificial fibre it is one of the most commonly used polyamides and was first used on February 28, 1935. Nylon makes a silky material which was first used in toothbrushes. It is strong, hard and water resistant.
Ans. 5 - There are several types of polyethylene : Ultra - high - molecular - weight polyethylene (UHMWPE) Ultra - law - molecular - weight polyethylene (ULMWPE or PE-WAX) High - molecular - weight polyethylene (HMWPE)