NCERT Solutions for Class 8 Science Chapter 3

NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics (अध्याय 3: संश्लेषित रेशे और प्लास्टिक) to Study online or download in PDF form for academic session 2020-21 based on latest NCERT Books.

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NCERT Solutions for Class 8 Science Chapter 3

Class:8
Subject:Science
Chapter 3:Synthetic Fibres and Plastics

Class 8 Science Chapter 3 Answers

NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics is given below. Video Format solutions of all chapters class 8 science are also available. Download 8 Science App for offline use.



Important Questions for Practice

1. Pick the synthetic fibre out of the following?
(a) Cotton
(b) Nylon
(c) Jute
(d) Wool
2. Which of the following groups contain all synthetic substances?
(a) Nylon, Terylene, Wool
(b) Cotton, Polycot, Rayon
(c) PVC, Polythene, Bakelite
(d) Acrylic, Silk, Wool
3. Which is a thermosetting plastic?
(a) Melamine
(b) Polythene
(c) PVC
(d) Nylon
4. The most suitable material for the preparation of handles of cooking utensils is
(a) Polythene
(b) PVC
(c) Nylon
(d) Bakelite
5. The material similar to silk in appearance is
(a) Nylon
(b) Rayon
(c) Polyester
(d) Terylene
6. Which of the following is not a common property of plastics?
(a) Non-reactive
(b) Light in weight
(c) Durable
7 Good conductor of electricity
10. The material which is commonly used for making kitchen containers is
(a) PVC
(b) Acrylic
(c) Teflon
(d) PET
8. Polycot is obtained by mixing
(a) nylon and wool
(b) polyester and wool
(c) nylon and cotton
(d) polyester and cotton
9. Fill in the blanks.
(i) A polymer is a chain of many small units joined together which are called ______.
(ii) The synthetic fibres are also known as ______ fibres.
(iii) The first fully synthetic fibre was ______.
(iv) A fibre similar to wool is ______.
(v) A plastic used for making crockery is ______.
10. Plastic is used for making a large variety of articles of daily use and these articles are very attractive. But it is advised to avoid the use of plastic as far as possible. Why?
11. PVC (polyvinyl chloride) is a thermoplastic and is used for making toys, chappals, etc. Bakelite is a thermosetting plastic and is used for making electrical switches, handles of various utensils, etc. Can you write the major difference between these two types of plastics?




Answers of Important Question

1 (b)
2 (c)
3 (a)
4 (d)
5 (b)
6 (d)
7 (d)
8 (d)
9 (i) monomers (ii) man-made (iii) nylon (iv) acrylic (v) melamine
10 Due to its non-biodegradable nature it causes environmental pollution.
11 Thermoplastics get deformed easily on heating and can be bent easily on heating. On the other hand thermosetting plastics when molded once cannot be softened on heating.



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NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics
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