Match the correct answer a. Polystyrene i. most chemically inert b. Bakelite ii. tough and good insulator c. PVC iii. easily moulded d. Perspex iv. good electrical insulator e. PTFE v. transparent like glass

(a) Polystyrene → (iii) Easily moulded Polystyrene is a thermoplastic. It is easily moulded because it melts when exposed to heat. It used in packaging foam, food containers, electronic devices. (b) Bakelite → (ii) Tough and good insulator Bakelite is thermosetting plastic and is bad conductor of heat and electricity. Hence, it is used in insulating parts in electrical fixtures like buttons, plugs, switches etc. (c) PVC → (iv) Good electrical insulator PVC is thermoplastic and is poor conductor of heat and electricity. Therefore, it is a good insulator. It is used in plumbing pipes and guttering, shower curtains, window frames because it is good electrical insulator. (d) Perspex → (v) Transparent like glass Perspex is used in making window panes of aeroplanes and cars because it is transparent like glass. (e) PTFE → (i) Most Chemically inert PTFE do not react with things and is used in things like non-stick frying pans, plumber’s tape and water slides. a. Polystyrene (iii) Easily moulded b. Bakelite (ii) Tough and good insulator c. PVC (iv) Good electrical insulator d. Perspex (v) Transparent like glass e. PTFE (i) Most Chemically inert

E M B I B E

I Explore 3rd EDITION A Science Textbook 8>Chapter 3 - Synthetic Fibers and Plastics>Check Point>Q 3

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8th CBSE

IMPORTANT

Earn 100

What are the main properties of nylon that make it so useful?

Important Questions on Synthetic Fibers and Plastics

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8th CBSE

IMPORTANT

I Explore 3rd EDITION A Science Textbook 8>Chapter 3 - Synthetic Fibers and Plastics>Check Point>Q 1

What is perspex? Mention two properties of perspex.

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8th CBSE

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I Explore 3rd EDITION A Science Textbook 8>Chapter 3 - Synthetic Fibers and Plastics>Check Point>Q 2

What are the major properties of Teflon that makes it so useful?

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8th CBSE

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I Explore 3rd EDITION A Science Textbook 8>Chapter 3 - Synthetic Fibers and Plastics>Check Point>Q 3

What does PTFE stand for? Give one use of it.

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8th CBSE

IMPORTANT

I Explore 3rd EDITION A Science Textbook 8>Chapter 3 - Synthetic Fibers and Plastics>EXERCISES>Q A

Which of the following is called artificial silk?

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8th CBSE

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I Explore 3rd EDITION A Science Textbook 8>Chapter 3 - Synthetic Fibers and Plastics>EXERCISES>Q A

Which of the following is semi-synthetic?

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8th CBSE

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I Explore 3rd EDITION A Science Textbook 8>Chapter 3 - Synthetic Fibers and Plastics>EXERCISES>Q A

Which among the following is a thermosetting plastic?

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8th CBSE

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I Explore 3rd EDITION A Science Textbook 8>Chapter 3 - Synthetic Fibers and Plastics>EXERCISES>Q A

Which of the following is used in making electric fittings?

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8th CBSE

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I Explore 3rd EDITION A Science Textbook 8>Chapter 3 - Synthetic Fibers and Plastics>EXERCISES>Q B

Match the correct answer

a.	Polystyrene	i.	most chemically inert
b.	Bakelite	ii.	tough and good insulator
c.	PVC	iii.	easily moulded
d.	Perspex	iv.	good electrical insulator
e.	PTFE	v.	transparent like glass

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