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synthetic fibres and Plastics Class 8 CBSE Important questions(Long type questions)





In this page we have synthetic fibres and Plastics Class 8 CBSE Important questions(Long type questions) . Hope you like them and do not forget to like , social share and comment at the end of the page.
Long answer type questions
Question 1
What are blended fibres? Are they better than synthetic fibre? Explain with an example.
Answer
Blended fibres are the fibres created by combining two different fibres so that they have the advantages of both. Generally, a synthetic fibre is added to a natural fibre.
e.g. Cotton blended with polyester (polycot) will give you the comfort of cotton along with the wrinkle- resistant of polyester so they are better than synthetic fibre and these are highly durable and last longer.
Question 2
Why are plastics preferred these days? Explain giving example?
Answer
Plastic are strong, lightweight, electrical insulators and resistant to chemicals and they are generally cheaper than metal so these properties make them highly versatile materials for making numerous household and industrial goods.
For e.g. Polythene, a thermoplastic is use widely as packaging material for liquid. Polystyrene is used for making electronic items.
Question 3
Write three uses of plastics?
Answer
1. Polyethylene terephthalate (PET) is used making containers that can be used in microwave ovens and bottles for packing mineral water and medicines.
2. Polyvinyl chloride (PVC) is used for making plumbing pipes, concealing electrical lining and furniture.
3. Bakelite is used for making electrical fitting.


Question 4
What are biodegradable and non- biodegradable materials? Give one example of each of them?
Answer
Biodegradable- A substance is biodegradable if it can be decomposed by the action of micro-organisms through a natural process. E.g. Paper, wood
Non- biodegradable- Substances that cannot decay by natural process when acted upon by decomposers are called non- degradable substances. E.g. Plastic
Question 5
How is rayon made? Why it is called artificial silk?
Answer
Rayon is made from wood pulp. Wood pulp is first dissolved in an alkaline solution. The thick liquid produced is then passed through tiny holes to make fibres. The fibres are then hardened and spun into yarn and woven into clothes. It is called artificial silk because of its close resemblance to silk it has the shine of silk but costs much less than silk.


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Class 8 Maths Class 8 Science
Reference Books for class 8 science

Given below are the links of some of the reference books for class 8 science.

  1. Oswaal NCERT & CBSE Pullout Worksheets Class 8 Science These worksheets can help student evaluate whatever he/she has studied from the text books.
  2. Science for Class 8 Paperback by Lakhmir Singh Detailed science book to clear basics and concepts. I would say it is a must have book for class 8 student.
  3. Pearson Foundation Series (IIT -JEE / NEET) Physics, Chemistry, Maths & Biology for Class 8 (Main Books) | PCMB Combo : These set of books could help your child if he aims to get extra knowledge of science and maths. These would be helpful if child wants to prepare for competitive exams like JEE/NEET. Only buy if you can provide help to the child while studying.
  4. Reasoning Olympiad Workbook - Class 8 :- Reasoning helps sharpen the mind of child. I would recommend students practicing reasoning even though they are not appearing for Olympiad.

You can use above books for extra knowledge and practicing different questions.







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