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synthetic fibres and Plastics Class 8 CBSE Practice questions




In this page we have synthetic fibres and Plastics Class 8 CBSE Practice questions . Hope you like them and do not forget to like , social share and comment at the end of the page.

I.Practice questions

Question 1
Why is polyester considered to be a good material for making the sails of ships?
Question 2
Name the component fibres of polycot, Terry wool and cots wool?
Question 3
Why polythene bags should not be thrown along with garbage?
Question 4
What are synthetic fibres? How are they made?
Question 5
Differentiate between thermoplastics and thermosetting plastics and give one example of each?
Question 6
List and explain four properties of plastics? Give one use of plastics linked to each of these properties?

Question 7
List three steps you can take to reduce the danger that plastic pose to the environment?
Question 8
Describe any three major uses of nylon?
Question 9
State advantages and disadvantages of synthetic fibres
Question 10
Explain polymerization?

II. Answer the following questions briefly:

Question 1
Why is acrylic often used to make sweaters and blankets?

Answer

Acrylic is warm.


Question 2
List the two ways in which synthetic fibres can be synthesised.

Answer

Synthetic fibres may be synthesized by two ways:
By regenerating them from natural fibres, and by using chemicals and chemical reactions.


Question 3
What is rayon manufactured from?

Answer

rayon is manufactured from the natural wood pulp after chemically treating it.


Question 4
Mention one disadvantage of synthetic fibres.

Answer

It has low water absorption rate. It does not absorb any sweat and hence very uncomfortable in summers.


Question 5
why do we need blended fibres?

Answer

This has been developed to cater specific needs by combining the attributes of different fibres to achieve a desired outcome.


Question 6
List two advantages of rayon,

Answer

a. It is less expensive than silk.
b. absorbs moisture and is comfortable to wear.


Question 7
Why polythene bags should not be thrown along with garbage?

Answer

because it is non-biodegradable and sometimes stray animals swallow plastic bags and choke their respiratory system.


Question 8
What is plasticity?

Answer

Plasticity is the property of materials by which they can be moulded into any shape.


Question 9
State two uses of nylon.

Answer

(a)Used to make socks and stockings
(b)Used to make ropes, fishing nets.


Question 10
Define thermoplasts.

Answer

It is a type of plastics which can be remoulded into various shapes again and again on heating.


Summary

This synthetic fibres and Plastics Class 8 CBSE Practice questions is prepared keeping in mind the latest syllabus of CBSE . This has been designed in a way to improve the academic performance of the students. If you find mistakes , please do provide the feedback on the mail.



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