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One of the most significant topics for students to cover in their exams is Synthetic Fibres and Plastics Chapter 3 of Science Class 8. Infinity Learn’s solutions are designed to ensure that students comprehend everything they need to know. They provide clarity in concepts, reasoned explanations, and examples in each response, broadening the scope of comprehension.
Synthetic Fibres and Plastics NCERT Exemplar Solutions Class 8 Science is available for free download in this article. Students looking for NCERT Exemplar Solutions for Class 8 Science will find the solutions curated by our Master Teachers to be extremely beneficial.
NCERT answers for Class 8 Science Chapter 3 are quite important in terms of the final test. Students will gain a better understanding of the topic by using the NCERT Exemplar Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics.
One of the key goals of this method is to ensure that the concept is clear, that the content is quickly absorbed, and that the language is simple to understand. Understanding the NCERT principles, terminologies, and questioning style is extremely crucial with NCERT Exemplar Solutions for Class 8 Science Chapter 3.
The solutions are created by specialist professional personnel that have a better comprehension of the concepts and the types of replies that must be written in tests, topic by topic. These Ncert Class 8 Chapter 3 Science answers PDF will certainly assist you in your learning and logical thinking.
NCERT Exemplar Class 8 Science Solutions Chapter 3 Synthetic Fibres and Plastics
You can also get NCERT Exemplar Solutions for Class 8 Maths to help you revise the entire syllabus and improve your exam scores.
- Pick the synthetic fibre out of the following?
(a) Cotton
(b) Nylon
(c) Jute
(d) Wool
Answer –
Answer is (b) Nylon
Explanation:
Cotton and Jute are from plant sources, Wool is of animal source whereas Nylon is a synthetic fibre.
- Which of the following is a source of rayon?
(a) Wool
(b) PET
(c) Wood pulp
(d) Silk
Answer –
Answer is (c) Wood pulp
Explanation:
Rayon is obtained by chemical treatment of wood pulp.
- Polycot is obtained by mixing
(a) nylon and wool
(b) polyester and wool
(c) nylon and cotton
(d) polyester and cotton
Answer –
Answer is (d) polyester and cotton
- Which is a thermosetting plastic?
(a) Melamine
(b) Polythene
(c) PVC
(d) Nylon
Answer –
Answer is (a) Melamine
Explanation:
Thermosetting plastics when moulded once can not be softened by heating. Examples are bakelite and melamine.
- The material similar to silk in appearance is
(a) Nylon
(b) Rayon
(c) Polyester
(d) Terylene
Answer –
Answer is (b) Rayon
Explanation:
Rayon is obtained by chemical treatment of wood pulp. Rayon is cheaper than silk and can be woven like silk.
- The most suitable material for the preparation of handles of cooking utensils is
(a) Polythene
(b) PVC
(c) Nylon
(d) Bakelite
Answer –
Answer is (d) Bakelite
Explanation:
Bakelite is a bad conductor of heat and it does not get soft on heating hence Bakelite is used to prepare handles of cooking utensils.
- Which of the following is not a common property of plastics?
(a) Non-reactive
(b) Light in weight
(c) Durable
(d) Good conductor of electricity
Answer –
Answer is (d) Good conductor of electricity
Explanation:
Plastic is a bad conductor of electricity.
- Which of the following represents the correct match for items in Column A with those in Column B.
Column A – Column B
- Nylon – (i) Thermoplastic
- PVC – (ii) Thermosetting plastic
III. Bakelite – (iii) Fibre
choose the option
(a) I-(ii), II-(iii), III-(i)
(b) I-(iii), II-(i), III-(ii)
(c) I-(ii), II-(i), III-(iii)
(d) I-(iii), II-(ii), III-(i)
Answer –
Answer is (c) I-(ii), II-(i), III-(iii)
- 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
Answer –
Answer is (c) PVC, Polythene, Bakelite
Explanation:
In option a) and c) there is wool which is extracted from an animal source.
In option b) there is cotton which is from a plant source.
Hence the answer is (c) PVC, Polythene, Bakelite.
- The material which is commonly used for making kitchen containers is
(a) PVC
(b) Acrylic
(c) Teflon
(d) PET
Answer –
Answer is (d) PET
Explanation:
PET or Polyethylene tetra thalate is lightweight and it is used in making kitchen containers.
Very Short Answer Questions
- Cotton is a natural polymer. What is its chemical name?
Answer –
The chemical name of cotton is cellulose.
- A synthetic fibre which looks like silk is obtained by chemical treatment of wood pulp. It is, therefore, known as artificial silk. What is its common name?
Answer –
Rayon is known as artificial silk.
- Terrycot is made by mixing two types of fibres. Write the names of the fibres.
Answer –
Terrycot is prepared by mixing terylene and cotton.
- Plastic articles are available in all possible shapes and sizes. Can you tell why?
Answer –
It is very easy to make moulds from plastic hence it is available in all possible shapes and sizes.
- 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?
Answer –
Plastic is not bio-degradable and disposing of plastic waste is a major issue. Hence it is advised to avoid the use of plastic as far as possible.
- Why is it not advisable to burn plastic and synthetic fabrics?
Answer –
Burning of plastic releases toxic gases which pollutes the air. Hence it not advisable to burn plastic and synthetic fabrics.
- Select the articles from the following list which are biodegradable.
(a) Paper
(b) Woollen clothes
(c) Wood
(d) Aluminium can
(e) Plastic bag
(f) Peels of vegetables
Answer – 3
- Paper
- Woollen clothes
- Wood
- Peels of vegetables
- A bucket made of plastic does not rust like a bucket made of iron. Why?
Answer –
Plastic is a non-reactive material. To form rust it should react with water and oxygen. Hence plastic does not form rust.
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