Fibres and Plastics
Q1. Fill in the blanks.
Synthetic fibres are also called artificial
or man-made fibres.
Synthetic fibres are synthesised from raw
material called petrochemicals.
Like synthetic fibres, plastic is also a polymers.
is a popular polyester.
is made of many repeating units.
Thermoplastics can bent easily. True
Polymers are made up of many bigger units. False
PET is a very familiar form of polyester. True
Polyester fabrics do not get wrinkled
Fabric obtained from silk fibre is very cheap.
Fabric made from polyester fibre does not
get wrinkled easily. True
Q3. Name the plastic whose sheets are used for packing liquids.
Q4. Name one naturally occurring polymer.
Q5. Name the fibre used for making parachutes and ropes for rock
Q6. Which synthetic fiber is known as artificial silk?
Rayon fiber is known as artificial silk.
Q7. Which is the first fully synthetic fibre?
is the first fully synthetic fibre.
Q8. Write one disadvantage of synthetic fibre.
Ans. Synthetic fibres melt on heating.
Q9. What are esters?
Esters are the chemicals which give fruits their smell.
Q10. What are the 4 R in waste management?
What are the 4 R's principles of plastic?
Ans. 4 R principles mean Reduce, Reuse, Recycle and
Q11. What are the advantages of nylon?
Ans. Nylon fibre is strong, elastic and light. It is
lustrous and easy to wash.
Q12. Write uses of bakelite.
It is used for making electrical switches, handles of various utensils, etc.
Q13. Write uses of melamine.
Ans. It is used for making floor tiles, kitchenware
and fabrics which resist fire.
Q14. How is rayon different from synthetic fibres?
Rayon is different from synthetic fibres because it is obtained from a natural
source, wood pulp.
Q15. Give examples which indicate that nylon fibres are very
fibres are very strong as it is used to make
parachutes and ropes for rock climbing.
Q16. What is polythene?
Ans. Polythene (Poly + ethene) is a type of plastic
that is used for making commonly used polythene bags.
Q17. Is plastic bag non-biodegradable? Why?
Plastic bag is non-biodegradable because it takes several years to degenerate.
Q18. Can we store jams and pickles in plastic containers? Give
Ans. We can store jams and pickles in plastic
containers because plastics do not react with water and air and do not get corroded
Q19. Do all plastics have same type of arrangement of units?
Ans. All plastics do not have the same type of
arrangement of units. In some it is linear, whereas in others it is
Q20. Why nylon is called fully synthetic fibre?
Ans. Nylon is called fully synthetic fibre because it
is prepared from coal, water and air.
Q21. What is polyester?
Ans. Polyester (Poly+ester) is actually made up of the
repeating units of a chemical called an ester.
Q22. Write one use of acrylic.
Ans. Acrylic is used as a substitute of natural wool
for knitting sweaters, shawls, blankets etc.