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प्रश्न
Write an activity to show that synthetic fibres are stronger than the cotton fibres.
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उत्तर
Activity: Take threads of cotton and nylon (synthetic fibres) of about the same length and thickness. Hang cotton, thread from a stand. Attach a pan at the other end of the thread.
Add weights, one by one, to the pan until the thread breaks (see figure) note the total weight required to break the cotton thread. This gives a measure of the tensile strength of the thread. Repeat the same with nylon thread.
Arrangement to determine the relatives strengths of natural fibres and synthetic fibres.
Conclusion
Much more weight is required to break the nylon thread showing that nylon thread has greater strength than the cotton thread.
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संबंधित प्रश्न
Mark (✓) the correct answer:
Rayon is different from synthetic fibres because
Fill in the blanks with appropriate words.
Synthetic fibres are synthesised from raw materials called ______
Rana wants to buy shirts for summer. Should he buy cotton shirts or shirts made from synthetic material? Advise Rana, giving your reason.
Synthetic fibre is also called _______ fibre.
A synthetic fibre which has similar properties to wool is______.
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.
A synthetic fiber which looks like silk is obtained by chemical treatment of wood pulp. It is, therefore, known as artificial silk. What is its common name?
Unscramble the jumbled word given below, related to synthetic material.
Anory
Indicate whether the following statement is True or False. Also write the false statement in their correct form.
Synthetic fibres do not melt on heating
Write the importance of synthetic polymers in our life.
