Class 8 Science Chapter-13 Synthetic Fibres and Plastics DAV|CBSE Book 2021

Class 8 Science Chapter-13 Synthetic Fibres and Plastics DAV|CBSE Book 2021 

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Class 8 Science Chapter-13 : Synthetic Fibres and Plastics 

This Post Contains All The Exercises of Chapter 13 Science Of Class 8 .

• A.Fill In The Blanks

• B. State True or False for the following statements 

• C.Tick (√) The Correct Option

• D.Answer The Following Questions in Brief 

• E.Answer The Following Questions
• Value Based Question
• Something To Do

SOMETHING TO KNOW 

A. Fill in the blanks :

1. Cotton and Silk are examples of natural fibres.

2. The simplest molecule of a polymer is known as a monomer.

3. Rayon is also known as a regenerated fibre.

4. Nylon is a synthetic fibre.

5. Thermosetting Plastics cannot be remoulded again on heating.

B. State true or false for the following statements:

1. Natural fibres are highly resistant to the effects of chemicals like acids and alkalis.

Ans) False 

2. Synthetic fibres absorb very little water.

Ans) True 

3. Thermoplastics can be easily remoulded on heating.

Ans) True 

4. The plastic, used for insulating electrical wires, is teflon. 

Ans) False 

5. All types of plastics are biodegradable.

Ans) False 

C. Tick (✓) the correct option : 

1. The correct choice, for the box, in the following sequence is - thermoplastic: PVC; Thermosetting Plastic : [?]

Ans) Bakelite

2. Which of the following is also known as the 'wonder polymer"?

Ans) Nylon

3. A highly durable synthetic fibre used for making parachutes and ropes for rock climbing and fishing nets, is

Ans) Nylon

4. Which of the following is NOT one of the characteristics of synthetic fibres?

Ans) Biodegradable.

5. Melamine is a thermosetting plastic; for it one can say that - 

Ans) It has a cross-linked arrangement of molecules.

6. Which of the following is a correct statement about synthetic plastics?

Ans) Synthetic plastics have quite high tensile strengths.

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