Important Questions - Synthetic Fibres & Plastics Class 8 Notes | EduRev

Class 8 : Important Questions - Synthetic Fibres & Plastics Class 8 Notes | EduRev

 Page 1


 
BAL BHARATI PUBLIC SCHOOL, PITAMPURA, DELHI-110034       
CLASS-8  Term I (2013-2014) 
CHEMISTRY NOTES 
     
SYNTHETIC FIBRES AND PLASTICS 
 
Q1. What is a Fibre ? 
A1. A fibre is a kind of thread which is woven to make a fabric. 
Q2. How are fibres classified ? Give examples. 
A2. Fibres are of two types – Natural fibres eg. Cotton , Wool, Silk and 
Synthetic fibres – Polyester , Nylon. 
Q3. What is Polymerization reaction. 
A3. The process of linking together of small monomers to form polymers is called  
polymerization. 
Q4. Why is Rayon called artificial silk ? 
A4. As Rayon resembles silk in its appearance, texture and shine, so it is called artificial silk. 
Q5. Name the raw materials used to make Nylon and Rayon. 
A5.  Nylon – Coal, water and air 
 Rayon – Wood pulp 
Q6 Which property of Nylon enables it to be used: 
A6. a) to make rope for rock climbing - Strong fibre, light in weight, weather resistant. 
b) To make tents – Strong, light, does not absorb much water, dries quickly  
c) Fishing nets – Strong, elastic, resist water 
Q7. From which monomer is polyester prepared ? Name some types of polyester fibres. 
A7. Polyester is prepared from the monomer called Ester. Terylene ,Terene and Dacron are some 
types of polyester fibres.  
Q8. List some advantages of polyester over cotton? 
A8 As polyester is synthetic fibre, it is - 
a. Strong 
b. Wrinkle resistant 
c. Not attacked by Moth. 
d. Does not absorb much water and dries up quickly. 
Q9. What are blended fibres ? Give examples. 
A9. Fibres formed by mixing natural & synthetic fibres. 
Page 2


 
BAL BHARATI PUBLIC SCHOOL, PITAMPURA, DELHI-110034       
CLASS-8  Term I (2013-2014) 
CHEMISTRY NOTES 
     
SYNTHETIC FIBRES AND PLASTICS 
 
Q1. What is a Fibre ? 
A1. A fibre is a kind of thread which is woven to make a fabric. 
Q2. How are fibres classified ? Give examples. 
A2. Fibres are of two types – Natural fibres eg. Cotton , Wool, Silk and 
Synthetic fibres – Polyester , Nylon. 
Q3. What is Polymerization reaction. 
A3. The process of linking together of small monomers to form polymers is called  
polymerization. 
Q4. Why is Rayon called artificial silk ? 
A4. As Rayon resembles silk in its appearance, texture and shine, so it is called artificial silk. 
Q5. Name the raw materials used to make Nylon and Rayon. 
A5.  Nylon – Coal, water and air 
 Rayon – Wood pulp 
Q6 Which property of Nylon enables it to be used: 
A6. a) to make rope for rock climbing - Strong fibre, light in weight, weather resistant. 
b) To make tents – Strong, light, does not absorb much water, dries quickly  
c) Fishing nets – Strong, elastic, resist water 
Q7. From which monomer is polyester prepared ? Name some types of polyester fibres. 
A7. Polyester is prepared from the monomer called Ester. Terylene ,Terene and Dacron are some 
types of polyester fibres.  
Q8. List some advantages of polyester over cotton? 
A8 As polyester is synthetic fibre, it is - 
a. Strong 
b. Wrinkle resistant 
c. Not attacked by Moth. 
d. Does not absorb much water and dries up quickly. 
Q9. What are blended fibres ? Give examples. 
A9. Fibres formed by mixing natural & synthetic fibres. 
e.g. Polywool – polyester + wool, 
Terycot – Terylene + cotton 
Q10. Which form of polyester is used to make bottles, utensils, wires ? 
A10. P.E.T. (PolyEtheneTetraphthalate) 
Q11. Explain why storage of Acrylic needs no special care unlike woollen clothes ? 
A11. Acrylic is synthetic wool which is resistant to the action of moths and insects while  
woollen clothes need to be stored in naphthalene as they are attacked by insects. 
Q12. Give reasons - 
A12. a. Buckets are made of plastics these days - As plastics are light in weight ,strong do not rust 
b. Bakelite plastic is used to make electrical switches.- As Bakelite is a poor  
conductor of heat and electricity. 
c. Melamine is used to make crockery – As it is unbreakable, resist fire and tolerate  
heat better than other plastics. 
d. Plastics are used in cars, aircrafts and space crafts – As they are light in weight,  
corrosion resistant, strong and durable.  
e. Chemicals are stored in plastic bottles – As they are resistant to the action of  
chemicals, light , unbreakable and corrosion resistant. 
Q13. Which special plastic is used - 
A13. a. For making non-stick coating on cookwares – Teflon 
b. To make insulation covering on wires – P.V.C. 
c. To make poly bags - Polyethene 
d. To make flame resistant uniforms – Melamine 
Q14. Why is plastics a cause of environment pollution ? 
A14. a. Non biodegradable nature 
b. Burning of plastic releases toxic fumes which cause air pollution. 
Q15. Suggest a few ways to minimize pollution due to plastics. 
A15. a. Reduce use of plastics – use jute, cotton, paper bags. 
b. Do not throw plastics on the road or in the water bodies. 
***** 
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