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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
Give examples which indicate that nylon fibres are very strong.
Match the terms of column A correctly with the phrases given in column B.
| A | B | ||
| 1 | Polyester | a | Prepared by using wood pulp |
| 2 | Teflon | b | Used for making parachutes and stockings |
| 3 | Rayon | c | Used to make non-stick cookware |
| 4 | Nylon | d | Fabrics do not wrinkle easily |
‘Manufacturing synthetic fibres is actually helping conservation of forests’. Comment.
Give reason.
Why umbrellas are made up of synthetic clothes?
Choose the odd one:
Pick the synthetic fibre out of the following.
The most suitable material for the preparation of handles of cooking utensils is ______.
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.
