NCERT Solutions for Class 8 Science Science - NCERT Solution Chapter 3

Synthetic Fibres and Plastics Class 8

Chapter 3 Synthetic Fibres and Plastics Exercise Solutions

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Exercise : Solutions of Questions on Page Number : 41

Q1 :  

Explain why some fibres are called synthetic.


Answer :

There are some fibres that are prepared by man by using chemicals. These are called synthetic fibres. These are made of small units that join together to form long chains. Examples of synthetic fibres are rayon, nylon, polyester, acrylic, etc.

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Q2 :  

Mark () the correct answer.

Rayon is different from synthetic fibres because

(a) it has a silk-like appearance.

(b) it is obtained from wood pulp.

(c) its fibres can also be woven like those of natural fibres.


Answer :

Rayon is different from synthetic fibres because

(a) it has a silk-like appearance.

(b) it is obtained from wood pulp. (correct)

(c) its fibres can also be woven like those of natural fibres.

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Q3 :  

Fill in the blanks with appropriate words.

(a) Synthetic fibres are also called _______ __or _______ __fibres.

(b) Synthetic fibres are synthesised from raw materials called _______ __.

(c) Like synthetic fibres, plastic is also a _______ __.


Answer :

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Q4 :  

Give examples which indicate that nylon fibres are very strong.


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Q5 :  

Explain why plastic containers are favoured for storing food.


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Q6 :  

Explain the difference between thermoplastic and thermosetting plastics.


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Q7 :  

Explain why the following are made of thermosetting plastics.

(a) Saucepan handles

(b) Electric plugs/switches/plug boards


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Q8 :  

Categorize the materials of the following products into 'can be recycled' and 'cannot be recycled'.

Telephone instruments, plastic toys, cooker handles, carry bags, ball point pens, plastic bowls, plastic covering on electrical wires, plastic chairs, electrical switches.


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Q9 :  

Rana wants to buy shirts for summer. Should he buy cotton shirts or shirts made from synthetic material? Advise Rana, giving your reason.


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Q10 :  

Give examples to show that plastics are non-corrosive in nature.


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Q11 :  

Should the handle and bristles of a tooth brush be made of the same material? Explain your answer.


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Q12 :  

'Avoid plastics as far as possible'. Comment on this advice.


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Q13 :  

Match the terms of column A correctly with the phrases given in column B.

A

B

(i)

Polyester

(a)

Prepared by using wood pulp

(ii)

Teflon

(b)

Used for making parachutes and stockings

(iii)

Rayon

(c)

Used to make non-stick cookware

(iv)

Nylon

(d)

Fabrics do not wrinkle easily


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Q14 :  

'Manufacturing synthetic fibres is actually helping conservation of forests'. Comment.


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Q15 :  

Describe an activity to show that thermoplastic is a poor conductor of electricity.


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<< Previous Chapter 2 : Microorganisms : Friend and Foe Next Chapter 4 : Materials : Metals and Non-Metals >>

Science - NCERT Solution - Science : CBSE NCERT Exercise Solutions for Class 8th for Synthetic Fibres and Plastics will be available online in PDF book form soon. The solutions are absolutely Free. Soon you will be able to download the solutions.

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