synthetic fibres and Plastics Class 8 questions answers
In this page we have synthetic fibres and Plastics Class 8 questions answers . This included Fill in the blanks, Match the column, Short answer type , True and false and Jumbled word questions.Hope you like them and do not forget to like , social share
and comment at the end of the page.
Fill in the blanks
----------made from both synthetic and natural fibers.
---------- is the another name of lycra.
---------- fibre is also called artificial silk.
Electrical switches are made of ----------.
The process of combining monomers to form a polymer is called-------.
Rayon is a fiber regenerated from---------.
------------ is often used are substitute for wool.
------------ is used as a coating on the surface of non- stick frying pans.
-----------synthetic fiber is commonly used to make strong ropes.
---------- are long- chain polymers made by linking of several ester units.
----------plastics are set into a particular shape cannot be remolded.
---------- is the most common source for synthetic fibers.
Plastic are an example of -----------.
Themocol is made from--------- plastic material.
Plastics are polymers that can be --------- and ---------- into any desired.
Non- biodegradable substance
Melted and Molded
i. ____is called a regenerated fibre.
ii. The full form of PVC is ___
iii. Synthetic fibres have ____. tensile strength.
iv. _____ is used to make bottles for packing mineral water.
v. Plastics do not react with water and ______
ii. polyvinyl chloride
Short Answer type
Name any two blended fibres?
Terry cot (terrylene+ cotton)
Terry cot ( ferrylene+ wool)
Why is rayon called a regenerated fibres?
Rayon is called regenerated fibers because the original raw material cellulose is broken down and then reformed.
Why is nylon considered to be a good material for making fishing nets?
Being a strong and lightweight material, it is used for making fishing net.
Why electric plugs and switches are made of plastic?
Plastics are poor conductor of heat and electricity so electric plug and switches are made of plastic
Why are plastic bottles commonly used to store chemicals in a chemistry laboratory?
Plastics have no reaction with water and air. They are non- reactive and do not corrode easily so they are used to store chemicals in chemistry laboratory.
What can be used as a substitute for wool? Why?
Acrylic can be used as a substitute for wool because it is a lightweight, soft and warm synthetic fiber which is wrinkle- resistant, cheaper than wool and resistant to moths and chemicals.
Distinguish between natural and synthetic fibers?
Natural fibers come from plants and animals such as cotton, jute etc.
Synthetic fibers are made from chemicals which come from wood, coal and petroleum such as rayon, nylon etc.
Why nylon is used for making socks?
Nylon fiber show good frictional resistance. It is elastic in nature and highly durable so it is used for making socks.
Why people prefer wearing cotton clothes over synthetic during summer?
Synthetic fibers cannot absorb moisture. This makes them unsuitable to be worn during summer when our body sweats.
Why Polyester clothes should be avoided in kitchen?
Polyester is highly flammable so they should be avoided in kitchen.
True and False
Question 11 State the following as True or False:
Polyester is the strongest synthetic fibre.
If plastics are burnt, they evolve oxygen gas.
Bakelite is an example of thermoset.
Terry wool is a blended fibre.
Artificial silk is another name for silk.
Question 12 Unscramble the following to form words.
Match the column
Question 13 Match the column
This synthetic fibres and Plastics Class 8 questions and answers 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.