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1. A polymer is a chain of many small units joined together which are called …………………….
2.The synthetic fibres are also known as ……………………. fibres.
3. The first fully synthetic fibre was ……………………
4.A fibre similar to wool is …………………….
5.A plastic used for making crockery is …………………….
1. A polymer is a chain of many small units joined together which are called monomers.
2. The synthetic fibres are also known as man-made fibres.
3. The first fully synthetic fibre was nylon.
4. A fibre similar to wool is acrylic.
5. A plastic used for making crockery is melamine.
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- Fill in the blanks with appropriate words.(a) Synthetic fibres are also called ____ or ____ fibres.(b) Synthetic fibres are synthesised from a raw material called _____(c) Like synthetic fibres, plastic is also a _____
- Fill in the blanks with appropriate words.Synthetic fibres are also called ……….. or ……….Synthetic fibres are synthesised from raw material called …………Like synthetic fibres, plastic is also a …………..
- Which synthetic fibre feels like wool and used as a substitute for wool?
- Name the first fully synthetic fibre.
- Why synthetic fibre is used for making swimwear?
- Fill in the following blanks with suitable words:(a) Synthetic fibres are also called __________ fibres.(b) Synthetic fibres are made from raw materials called __________(c) Like synthetic fibres, plastic is also a _____________(d) The use of plastics can be reduced by using bags made of _____________ or _____________ instead of polythene bags.
- Which synthetic fibres are used in making of space suits?
- (a) What are the short fibres of a neuron known as?(b) What is the long fibre of a neuron known as?
- Is the coconut fibre a natural or a synthetic fibre?
- The synthetic fibre A is chemically a polyamide whereas the synthetic fibre B contains a large number of ester groups. another synthetic fibre C is made of a polymer D which consists of a number of glucose units joined one after the other.(a) Which fibre could be (i) terylene (ii) rayon and nylon?(b) Name the polymer D.(c) Which fibre (A, B or C) is prepared from a natural raw material?(d) Which fibre (A, B or C) contains the same type of groups as those in a PET jar?
- Crossword Puzzle Complete the crossword given below with the help of clues.Across1. Substance used as synthetic wool. (7)2. A plastic used for making containers and carry bags. (9)3. Substance made up of large number of smaller molecules. (7)4. Another name for this compound is artificial silk. (5)Down5. A type of fibre obtained naturally from cocoon. (4)6. A synthetic fibre classified as polyester. (8)7. A polymer used for making ropes. (5)
- (a) What are synthetic fibres? Name any two synthetic fibres.(b) Why have synthetic fibres become more popular than natural fibres?
- Explain why some fibres are called synthetic?
- Is Jeans or Denim a Natural Fibre or A Synthetic Fibre?
- What are synthetic fibres?
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