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Out of rayon, cotton, nylon and silk, which fibre is derived from chemicals?
From where synthetic fibres are obtained?
Name the man-made fibre, made from the cellulose polymer.
How is polyester fibre made?
Which fibre is chemically identical to man-made fibre, rayon?
For what the term PET is usually used? Define this term.
Choose the thermoplastic and thermosetting plastic from the following:
Melamine, PVC, polythene, nylon, Bakelite
Which is better material for constructing handle of a pressure cooker -a thermoplastic or a thermosetting plastic?
What type of plastic is used to make electric switches?
Name one material used for non-stick coating on cookwares.
State the property of plastics due to which switches and plugs are made up of plastics.
Why plastic is lighter than metal?
Do the biodegradable materials cause environmental pollution? Name two biodegradable products.
Is cotton cloth biodegradable or non-biodegradable?
What do you understand by 4R principle? Why should we remember this principle?
Which fibre is commonly used for making ropes?
Name the fibre that burns readily with the smell of burning paper.
Give two examples of thermoplastics.
What is a natural fibre? Give one example.
Which material is used in making electrical switches?
Write the use of PET.
Write a product made of terylene.
By which process synthetic polymers are made?
Cotton and jute are animal fibres. Is it correct?
Give four important properties of plastics.
Write one advantage and one disadvantage of using clothes made from synthetic fibres.
Write the uses of plastics in healthcare industry.
What are the uses of nylon and rayon?
Polyesters are preferred for making dress materials. Why?
Write the process of preparing rayon.
What do you mean by polymerisation?
List some properties and uses of acrylic and polyester.
Why should we minimise the usage of plastics?
Why are microwave cookwares made of plastic?
Why is acrylic considered as a cheap substitute of wool?