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NCERT Solutions for Class 8 Science Synthetic Fibres and Plastics

NCERT Solutions for Class 8 Science Synthetic Fibres and Plastics

Edited By Irshad Anwar | Updated on Sep 22, 2023 11:39 AM IST

NCERT Solutions for Class 8 Science Synthetic Fibres and Plastics

Get free access to NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics: Class 8 Science Chapter 3 question answer will give you knowledge about Synthetic Fibres and Plastics, What are Synthetic Fibres?, Characteristics of Synthetic Fibres, Types of Synthetic Fibres Rayon, Plastics as Materials of Choice, and Environment. These are the important topics of this chapter, and you will get solutions for NCERT Class 8 Science Chapter 3 for all questions based on these topics. Synthetic Fibres and Plastics Class 8 Solutions provide answers to each question in the NCERT Textbook. These solutions are part of NCERT Solutions for Class 8 Science. Continue reading to go through the questions and answers given in NCERT Solutions for Class 8 Science Chapter 3.

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

According to the latest CBSE Syllabus 2023-24, class 8 science chapter 3, " Synthetic Fibres and Plastics" has been deleted.

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

Synthetic Fibres and Plastics Class 8 NCERT Solutions provide an explanatory answer to each question given in the NCERT Books.Class 8 Students must refer to these NCERT Solutions for Class 8 for other subjects to get all their queries resolved. Class 8 Science Chapter 3 question answer will help with your homework as well as in preparing for the examination. Read further to get solutions to each question, topics and subtopics included in the chapter, and the benefits of these NCERT Solutions.

Q. Most women do not prefer to wear polyester clothes while working in the kitchen. Give reason

Ans. Polyester is a synthetic fabric that melts on heating. So if women wear polyester in the kitchen there are chances that on heating, it will melt and stick to the body, causing destruction. Hence, most women do not prefer to wear polyester clothes while working in the kitchen.

Synthetic Fibres and Plastics Class 8 Science NCERT Textbook Questions Answers

Here are the detailed NCERT Solutions for Class 8 Science Chapter 3:

Synthetic Fibres and Plastics Class 8 Questions and Answers:

Q1. Explain why some fibres are called synthetic.

Answer: Some fibres are made by human beings and not obtained from plants and animals. These fibres are obtained by chemical processing of petrochemicals..That is why some fibres are called synthetic or man-made fibres. Few examples are Nylon, Polyester and Acrylic.

Synthetic Fibres and Plastics Class 8 NCERT Solutions

Q2. Mark ( tick ) 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: (b) is the correct option.

Rayon also called artificial silk is a man-made fibre, but it is obtained from a natural source, wood pulp. its fibres can also be woven like those of natural fibres

Class 8 Science Chapter 3 Question Answer

Q3. Fill in the blanks with appropriate words.

(a) Synthetic fibres are also called __________ or __________ fibres.

(b) Synthetic fibres are synthesised from raw material called __________ .

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

Answer: (a) Synthetic fibres are also called man-made or artificial fibres.

(b) Synthetic fibres are synthesised from a raw material called petrochemicals.

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

Synthetic Fibres and Plastics Class 8 Solutions

Q4. Give examples which indicate that nylon fibres are very strong.

Answer: Nylon fibres are used for making parachutes and ropes for rock climbing. These examples indicate that nylon fibres are very strong. Moreover, Nylon fibre is actually stronger than steel wire.

Synthetic Fibres and Plastics Class 8 NCERT Solutions:

Q5. Explain why plastic containers are favoured for storing food.

Answer: Plastic containers are favoured for storing a food item, water, milk etc. because of the following reasons:

(a) Plastics are lightweight

(b)Plastics are cheaper than metals

(c) Plastics are very strong and are easy to handle.

Class 8 Science Chapter 3 NCERT Solutions

Q.6. Explain the difference between thermoplastic and thermosetting plastics.

Answer:

Thermoplastics

Thermosetting Plastics

It gets deformed easily on heating and bends easily.

It does not get deformed on heating

The original shape is not retained

The original shape is retained

Examples: Polyethene and PVC

Examples: Bakelite and melamine

Synthetic Fibres and Plastics Class 8 Questions and Answers

Q7.(a) Explain why the following are made of thermosetting plastics.

Saucepan handles

Answer: Thermosetting plastics are those plastics which retain their shape on heating. Saucepan handles are made of thermosetting plastic like Bakelite because it is a poor conductor of heat. Hence, it prevents the hand from getting burned.

Class 8 Science Chapter 3 Question Answer:

Q7. Explain why the following are made of thermosetting plastics.

(b) Electric plugs/switches/plugboards

Answer: Thermosetting plastics are used to make electrical switches because these are a poor conductor of heat and electricity. Hence, they are good insulators and prevents from getting electric shocks.

Synthetic Fibres and Plastics Class 8 Solutions:

Q8. Categorise 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.

Answer:

Can be Recycled

Cannot be Recycled

Plastic toys

Telephone instruments

Carry bags

Cooker handles

Ball point pens

Electrical switches

Plastic bowls


Plastic covering on electrical wires


Plastic chairs


Class 8 Science Chapter 3 NCERT Solutions:

Q9. Rana wants to buy shirts for summer. Should he buy cotton shirts or shirts made from synthetic material? Advise Rana, giving your reason.

Answer: Rana should buy cotton shirts and not synthetic shirts for summer.

Because synthetic shirts are not good absorber of moisture as compared to cotton. Hence, during summer, cotton being a good absorber of moisture will let the sweat evaporate from the body.

Class 8 Synthetic Fibres and Plastics NCERT Solutions

Q10. Give examples to show that plastics are noncorrosive in nature.

Answer: The cleaning chemicals used at home are stored in plastic bottles, instead of metallic bottles/containers. This shows that plastics are noncorrosive in nature.

Class 8 Synthetic Fibres and Plastics NCERT Solutions:

Q11. Should the handle and bristles of a toothbrush be made of the same material? Explain your answer.

Answer: No, the handle and bristles of a toothbrush cannot be made of the same material. This is because the handle has to be hard and strong while bristles have to be soft and flexible.

Class 8 Science Ch 3 Question Answer

Q12. ‘Avoid plastics as far as possible’. Comment on this advice.

Answer: Although plastics have many properties which makes it very useful in our daily lives, yet we should try to avoid them as far as possible. This is because plastics are non-biodegradable. The waste created by plastics is not environment-friendly, which on burning release poisonous gases. Plastics may take years to degrade and keep on piling up and hence are an environmental hazard for the living community.

Class 8 Science Ch 3 Question Answer:

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

Answer:

(i)

Polyester

(d) Fabrics do not wrinkle easily

(ii)

Teflon

(c) Used to make non-stick c ookware

(iii)

Rayon

(a) Prepared by using wood p ulp

(iv)

Nylon

(b) Used for making parachutes and s tockings

NCERT Solutions for Class 8 Science Synthetic Fibres and Plastics:

Q 14. ‘Manufacturing synthetic fibres is actually helping conservation of forests’. Comment.

Answer: Natural fibres like cotton, wool are obtained from plants and animals. To acquire the raw materials, trees and plants have to be chopped off hence leading to deforestation. Whereas synthetic fibres like nylon, polyester are manufactured in laboratories using chemicals or petrochemicals. Hence manufacturing fibres are actually helping the conservation of forests.

NCERT Solutions for Class 8 Science Chapter 3:

Q15. Describe an activity to show that thermoplastic is a poor conductor of electricity.

Answer: Aim: To show thermoplastic is a poor conductor of electricity.

Materials required: A battery, conducting copper wires, an LED bulb, a small PVC (thermoplastic) rod, a metal rod.

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

Experiment: We make a circuit as shown. First, we connect the two ends of the copper wires with the metal rod. Next, we replace it with the PVC rod.

Observation: The LED bulb glows when the metal rod is connected but does not glow when the PVC rod is connected.

Conclusion: Thermoplastic is a poor conductor of electricity.

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

About Chapter 3 Science Class 8 - Synthetic Fibres and Plastics

Synthetic Fibres and Plastics Class 8 explains about Synthetic Fibres and Plastics. You will get knowledge about different types of synthetic fibres, their characteristics, about plastics and a lot more. You can also refer to the NCERT Class 8 Science Solutions Chapter 3 - Synthetic Fibres and Plastics to have a deep understanding of the questions asked in this chapter.

What are synthetic fibres

Chapter 3 Science Class 8 defines Synthetic fibres as those fibres which are produced in laboratories using chemicals by man. Thus, they are also called man-made fibres. Synthetic fibres are made in such a way that small units join together to form them. These small units that are joined together are called monomers. After joining they form polymers which make up the synthetic fibres. To learn in details, Read on NCERT Solution Class 8 Science Chapter 3.

Types of synthetic fibres

Every day you use so many different types of synthetic fibres such as rayon, nylon, polyester and acrylic. In Class 8 Chapter 3 Science, you will study about the various characteristics of the above mentioned synthetic fibres. So what do you think “are synthetic fibres better natural fibres”? After reading Science Class 8 Chapter 3 - Synthetic fibres and plastics, you will be able to find out the answer to this question.

NCERT Solutions for Class 8 Science Chapter 3

Each of you must have used objects made up of plastic. In NCERT Class 8 Chapter 3 Synthetic Fibres and Plastics, you will get to know the details about what is plastic, how it is made, what are its different characteristics and how they are useful to humans. Have you ever thought why plastic bags are now banned on grocery shops? Why everybody prefers to use paper cups and not plastic cups? You can get answers to these questions in Class 8 Science Chapter 3 Solution.

In the end, there are insights of biodegradable and non-biodegradable substances in your NCERT Textbook Science Chapter 3. Do you segregate your waste when you dispose of them? If yes, then how do you segregate them? Why do we see blue, red, yellow and green dustbins on roads? You will be able to answer all these questions once you have gone through Class 8 Science Chapter 3 NCERT Solutions.

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

Topics in Class 8 Science Chapter 3 Synthetic Fibres and Plastics:

Section NameTopic Name
3Synthetic Fibers and Plastics
3.1What are Synthetic Fibers?
3.2Types of Synthetic Fibers Rayon
3.3Characteristics of Synthetic Fibers
3.4Plastics
3.5Plastics as Materials of Choice
3.6Plastics and the Environment

Important subtopics in Synthetic Fibres and Plastics Class 8 Solutions:

  • Nylon
  • Rayon
  • Polyester and acrylic

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

  • The NCERT Class 8 Science solutions chapter 3 Synthetic Fibres and Plastics provided in this article are easy to understand. All the solutions are given in a very basic language which everyone can easily understand.
  • You can check the correct answers and solutions of each question from the Synthetic Fibres and Plastics Class 8 NCERT Solutions. This will be really beneficial during home works, and self-study.
  • It is very important to refer to the CBSE Syllabus 2023-24 to gain maximum benefit from the Class 8 Science Chapter 3 NCERT Solutions.
  • At times, questions in the Class tests and annual exams have been directly asked from the Class 8 Science Chapter 3 question answer. Hence you should check all the solutions carefully.
  • Class 8 Science Chapter 3 PDF is easily available to download.

What After NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastic

  • You can refer to the NCERT Book for Class 8 Science to check more chapters and questions.
  • To further check these solutions offline, you can get NCERT Solutions for Science Chapter 3 Class 8 by downloading the webpage.
  • Once you have completed the ch 3 science class 8 Solutions, you can check the other chapters solutions. The chapter-wise link of each chapter is provided in the table below.

NCERT Solutions For Class 8th Science: Chapter-wise

Tips to Crack CBSE Class 8 Exams

  • While preparing for the CBSE Class 8 exams, you should first read NCERT Syllabus for Class 8.

  • Make short notes for each topic and revise them on a regular basis.

  • Practice all the questions provided in the exercise. You can also refer to the NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics in case of any doubts.

  • Take help from your teachers or seniors if you have any questions. Do not let any query unresolved.

Why follow Careers360 to get NCERT Class 8 Solutions

Careers360 provides authentic and to the point solutions to each question. These solutions are prepared by the subject matter experts, which makes it completely reliable. All the NCERT solutions for Class 8 Science are given with proper explanations along with the relevant diagrams wherever required.

NCERT Solutions For Class 8: Subject-wise

Also, Check NCERT Books and NCERT Syllabus here


We hope you will ace your examination with the help of NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics.

Frequently Asked Question (FAQs)

1. Are these NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics reliable?

Yes, these  NCERT class 8 science solutions Chapter 3 Synthetic Fibres and Plastics are prepared by experts. Hence you can completely rely on them. 

2. Will the questions in the exams be directly asked from the NCERT books?

No, the questions will be similar to the ones given in the textbooks but they will not be exact. 

3. Is Chapter 3 of NCERT Class 8 Science important?

Yes, every chapter is equally important. 

4. Are these solutions provided for each and every question given in NCERT Chapter 3?

Yes, the solutions are available for every question of NCERT Chapter 3. 

5. Can I download these NCERT Solutions for Class 8 Science Chapter 3 Synthetic Fibres and Plastics?

Yes, you can download these solutions as a web page. 

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A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

Option 1)

0.34\; J

Option 2)

0.16\; J

Option 3)

1.00\; J

Option 4)

0.67\; J

A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times.  Assume that the potential energy lost each time he lowers the mass is dissipated.  How much fat will he use up considering the work done only when the weight is lifted up ?  Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate.  Take g = 9.8 ms−2 :

Option 1)

2.45×10−3 kg

Option 2)

 6.45×10−3 kg

Option 3)

 9.89×10−3 kg

Option 4)

12.89×10−3 kg

 

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

Option 1)

2,000 \; J - 5,000\; J

Option 2)

200 \, \, J - 500 \, \, J

Option 3)

2\times 10^{5}J-3\times 10^{5}J

Option 4)

20,000 \, \, J - 50,000 \, \, J

A particle is projected at 600   to the horizontal with a kinetic energy K. The kinetic energy at the highest point

Option 1)

K/2\,

Option 2)

\; K\;

Option 3)

zero\;

Option 4)

K/4

In the reaction,

2Al_{(s)}+6HCL_{(aq)}\rightarrow 2Al^{3+}\, _{(aq)}+6Cl^{-}\, _{(aq)}+3H_{2(g)}

Option 1)

11.2\, L\, H_{2(g)}  at STP  is produced for every mole HCL_{(aq)}  consumed

Option 2)

6L\, HCl_{(aq)}  is consumed for ever 3L\, H_{2(g)}      produced

Option 3)

33.6 L\, H_{2(g)} is produced regardless of temperature and pressure for every mole Al that reacts

Option 4)

67.2\, L\, H_{2(g)} at STP is produced for every mole Al that reacts .

How many moles of magnesium phosphate, Mg_{3}(PO_{4})_{2} will contain 0.25 mole of oxygen atoms?

Option 1)

0.02

Option 2)

3.125 × 10-2

Option 3)

1.25 × 10-2

Option 4)

2.5 × 10-2

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

Option 1)

decrease twice

Option 2)

increase two fold

Option 3)

remain unchanged

Option 4)

be a function of the molecular mass of the substance.

With increase of temperature, which of these changes?

Option 1)

Molality

Option 2)

Weight fraction of solute

Option 3)

Fraction of solute present in water

Option 4)

Mole fraction.

Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is

Option 1)

twice that in 60 g carbon

Option 2)

6.023 × 1022

Option 3)

half that in 8 g He

Option 4)

558.5 × 6.023 × 1023

A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m2 , the number of rotations made by the pulley before its direction of motion if reversed, is

Option 1)

less than 3

Option 2)

more than 3 but less than 6

Option 3)

more than 6 but less than 9

Option 4)

more than 9

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