Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 7th
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Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide chapter 3 - Polymer Chemistry [Latest edition]

Chapters

Class 7th Science Term 3 Answers Guide - Shaalaa.com
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Chapter 3: Polymer Chemistry

Evaluation
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Evaluation [Page 62]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 3 Polymer ChemistryEvaluation [Page 62]

Choose the correct answers

Evaluation | Q I. 1. | Page 62

The first man-made fibre is ______.

  • Nylon

  • Polyester

  • Rayon

  • Cotton

Evaluation | Q I. 2. | Page 62

Which of the following is the strongest?

  • Rayon

  • Nylon

  • Acrylic

  • Polyester

Evaluation | Q I. 3. | Page 62

When you place a natural fibre in a flame it ______.

  • melts

  • burns

  • gets nothing

  • explodes

Evaluation | Q I. 4. | Page 62

A synthetic fibre which has similar properties to wool is______.

  • Nylon

  • Polyester

  • Acrylic

  • PVC

Evaluation | Q I. 5. | Page 62

A good application of plastic is the use of ______

  • Blood bags

  • Plastic cutlery

  • Plastic straws

  • Plastic carry bag

Evaluation | Q I. 6. | Page 62

______ is a non-biodegradable material

  • Paper

  • A plastic bottle

  • Cotton cloth

  • Wool

Evaluation | Q I. 7. | Page 62

PET is the acronym for ______.

  • Polyester

  • Polyester and terylene

  • Polyethylene terephthalate

  • Polyetheneterylene

Evaluation [Page 62]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 3 Polymer ChemistryEvaluation [Page 62]

Fill in The Blanks.

Evaluation | Q II. 1. | Page 62

______ is an example of polyester fabric.

Evaluation | Q II. 2. | Page 62

______ are used to identify different types of plastics.

Evaluation | Q II. 3. | Page 62

A______is a long chain made up of many repeated small units called monomers.

Evaluation | Q II. 4. | Page 62

A natural fibre is called ______.

Evaluation | Q II. 5. | Page 62

A natural fibre obtained by boiling cocoons is called ______.

Evaluation [Page 62]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 3 Polymer ChemistryEvaluation [Page 62]

Evaluation | Q III. 1. | Page 62

True or False

A lot of plastic pollutes our environment.

  • True

  • False

Evaluation | Q III. 2. | Page 62

True or False

Refuse (avoid) is the best way to manage plastic.

  • True

  • False

Evaluation | Q III. 3. | Page 62

True or False

It is good to wear clothes made of synthetic fibres while cooking.

  • True

  • False

Evaluation | Q III. 4. | Page 62

True or False

Degradable plastics break down into tiny pieces called microplastics.

  • True

  • False

Evaluation | Q III. 5. | Page 62

True or False

Cotton is a natural polymer.

  • True

  • False

Evaluation [Page 62]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 3 Polymer ChemistryEvaluation [Page 62]

Evaluation | Q IV. | Page 62

Match the Following

A B
Nylon Thermoplastic
PVC Thermosetting plastic
Bakelite Fibre
Teflon Wood pulp
Rayon Non-stick cookwares
Evaluation [Page 62]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 3 Polymer ChemistryEvaluation [Page 62]

Evaluation | Q V. 1. | Page 62

Arrange in Correct Sequence

1. Mix water, starch, vinegar and glycerin in a cooking pot.
2. Let the article cool for 24 hours before we use it.
3. Shape material to form a cup or bowl.
4. Continuously mix on medium heat until the liquid turns clear.
5. When the liquid begins to bubble it is ready to be taken off the stove.
6. Spread the gel onto aluminium foil and cool.
Evaluation [Page 63]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 3 Polymer ChemistryEvaluation [Page 63]

Analogy

Evaluation | Q VI. 1. | Page 63

Cotton: natural : Polyester: ______.

Evaluation | Q VI. 3. | Page 63

PLA spoon: compostable: Plastic spoon: ______

Evaluation | Q VI. 3. | Page 63

Nylon: melts on heating: Silk: ______.

Evaluation [Page 63]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 3 Polymer ChemistryEvaluation [Page 63]

Evaluation | Q VII. 1. | Page 63

Assertion and Reason

A: Vegetable peels buried in the soil disappear within two weeks.

R: Vegetable peels are compostable.

  • Both A and R are true and R is the correct explanation of A.

  • Both A and R are true but R is not the correct explanation of A.

  • A is true but R is false.

  • A is false but R is true.

Evaluation | Q VII. 2. | Page 63

Assertion and Reason

A: It takes a very long time for nylon clothes to breakdown into microfibers but cotton clothes need only six months to decompose.

R: Nylon made out of petrochemicals is non-biodegradable and cotton cloth is biodegradable.

  • Both A and R are true and R is the correct explanation of A.

  • Both A and R are true but R is not the correct explanation of A.

  • A is true but R is false.

  • A is false but R is true.

Evaluation | Q VII. 3. | Page 63

Assertion and Reason

A: It is good to avoid plastics.

R: Plastics end up polluting the environment.

  • Both A and R are true and R is the correct explanation of A.

  • Both A and R are true but R is not the correct explanation of A.

  • A is true but R is false.

  • A is false but R is true.

Evaluation [Page 63]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 3 Polymer ChemistryEvaluation [Page 63]

Evaluation | Q VIII. | Page 63

Crossword

Across

1. Fibre that is used as synthetic wool.

2. A plastic used for making water bottles.

3. A long chain made of small repeatingmonomers.

4. Another name for this semi-synthetic fibre is artificial silk.

Down

5. A type of fibre that is naturally obtained from a cocoon.

6. A synthetic fibre classified as polyester.

7. A polymer used for making rope.

Evaluation [Page 64]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 3 Polymer ChemistryEvaluation [Page 64]

Very Short Answer

Evaluation | Q IX. 1. | Page 64

What is the chemical name of the polymers that make up cotton?

Evaluation | Q IX. 2. | Page 64

What gives plastic different qualities and characteristics?

Evaluation | Q IX. 3. | Page 64

It is not advisable to burn plastic and synthetic fabrics. Why?

Evaluation | Q IX. 4. | Page 64

A bucket made of plastic does not rust like a bucket made of iron. Why?

Evaluation | Q IX. 5. | Page 64

Why is it better to avoid the use of plastic products?

Evaluation | Q IX. 6. | Page 64

Give two examples of thermosetting plastics.

Evaluation | Q IX. 7. | Page 64

What is the 5 R principle?

Evaluation [Page 64]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 3 Polymer ChemistryEvaluation [Page 64]

Short Answer.

Evaluation | Q X. 1. | Page 64

What does the term biodegradable mean?

Evaluation | Q X. 2. | Page 64

What kind of fabric is suitable to dress-up and play in the summer?

Evaluation | Q X. 3. | Page 64

How do plastics impact animals and the environment?

Evaluation [Page 64]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 3 Polymer ChemistryEvaluation [Page 64]

Long Answer.

Evaluation | Q XI. 1. | Page 64

List the advantages and disadvantages of synthetic fibres.

Evaluation | Q XI. 2. | Page 64

Suggest safe methods of disposing plastics.

Evaluation [Page 64]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 3 Polymer ChemistryEvaluation [Page 64]

Evaluation | Q XII. 1. | Page 64

HOTS

The Tamil Nadu Government has banned the use of one-time use throwaway plastics. Why do you think this is important?

Evaluation | Q XII. 2. | Page 64

A plastic bag dumped in the soil stays without breaking down for 500 years. If a new generation starts in every 30 years, how many generations would it take to see the plastic bag finally broken down?

Evaluation [Page 64]

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide Chapter 3 Polymer ChemistryEvaluation [Page 64]

Evaluation | Q XIII. i) | Page 64

Fill in the blanks

Evaluation | Q XIII. ii) | Page 64

Look at the following picture and explain what is happening.

Evaluation | Q XIII. iii) | Page 64

Read the following information and convert them into a graph to compare the countries and the amount of plastic they use.

China contributes the highest share - that is around 28%, of the total plastic used globally. Indonesia uses 10%, both the Philippines and Vietnam use 6% each; Thailand uses 3.2%, Egypt 3%, Nigeria 2.7% and South Africa 2%.

Chapter 3: Polymer Chemistry

Evaluation
Class 7th Science Term 3 Answers Guide - Shaalaa.com

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide chapter 3 - Polymer Chemistry

Tamil Nadu Board Samacheer Kalvi solutions for Class 7th Science Term 3 Answers Guide chapter 3 (Polymer Chemistry) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Tamil Nadu Board of Secondary Education Class 7th Science Term 3 Answers Guide solutions in a manner that help students grasp basic concepts better and faster.

Further, we at Shaalaa.com provide such solutions so that students can prepare for written exams. Tamil Nadu Board Samacheer Kalvi textbook solutions can be a core help for self-study and acts as a perfect self-help guidance for students.

Concepts covered in Class 7th Science Term 3 Answers Guide chapter 3 Polymer Chemistry are Harmful Effects of Plastics, Fabrics, Plant Fibres: Cotton, Plant Fibre: Jute Fibre, Animal Fibres: Wool, Identifying Different Types of Plastics: Resin Codes, Animal Fibre: Silk, Recycling of Plastic, Man-made Fibre: Synthetic Fibres, Man-made Fibre: Rayon, Man-made Fibre: Nylon, Man-made Fibre: Plastics, Polymer Chemistry: Polymer, Fibre, Types of Plastics, Biodegradable Plastics, Plastic Eating Bacteria, Glass, Types of Glass, Man-made Fibre: Polyester and Acrylic.

Using Tamil Nadu Board Samacheer Kalvi Class 7th solutions Polymer Chemistry exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Tamil Nadu Board Samacheer Kalvi Solutions are important questions that can be asked in the final exam. Maximum students of Tamil Nadu Board of Secondary Education Class 7th prefer Tamil Nadu Board Samacheer Kalvi Textbook Solutions to score more in exam.

Get the free view of chapter 3 Polymer Chemistry Class 7th extra questions for Class 7th Science Term 3 Answers Guide and can use Shaalaa.com to keep it handy for your exam preparation

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