synthetic fibres and Plastics Class 8 CBSE Practice questions
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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?
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
II. Answer the following questions briefly:
Why is acrylic often used to make sweaters and blankets?
Acrylic is warm.
List the two ways in which synthetic fibres can be synthesised.
Synthetic fibres may be synthesized by two ways:
By regenerating them from natural fibres, and by using chemicals and chemical reactions.
What is rayon manufactured from?
rayon is manufactured from the natural wood pulp after chemically treating it.
Mention one disadvantage of synthetic fibres.
It has low water absorption rate. It does not absorb any sweat and hence very uncomfortable in summers.
why do we need blended fibres?
This has been developed to cater specific needs by combining the attributes of different fibres to achieve a desired outcome.
List two advantages of rayon,
a. It is less expensive than silk.
b. absorbs moisture and is comfortable to wear.
Why polythene bags should not be thrown along with garbage?
because it is non-biodegradable and sometimes stray animals swallow plastic bags and choke their respiratory system.
What is plasticity?
Plasticity is the property of materials by which they can be moulded into any shape.
State two uses of nylon.
(a)Used to make socks and stockings
(b)Used to make ropes, fishing nets.
It is a type of plastics which can be remoulded into various shapes again and again on heating.
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.