synthetic fibres and Plastics Class 8 CBSE Practice questions
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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.
