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प्रश्न
Write an activity to show that synthetic fibres are stronger than the cotton fibres.
उत्तर
Activity Take threads of cotton and nylon (synthetic fibres) of about 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 fig.) 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 a grater strength that the cotton thread.
APPEARS IN
संबंधित प्रश्न
‘Manufacturing synthetic fibres is actually helping conservation of forests’. Comment.
A synthetic fibre which has similar properties to wool is______.
True or False
It is good to wear clothes made of synthetic fibres while cooking.
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.
The artificial fibers are also known as ______.
Write the uses of synthetic fibers.
The most suitable material for the preparation of handles of cooking utensils is
Cotton is a natural polymer. What is its chemical name?
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?
______ is a synthetic fibre which is strong and elastic that it has the ability to bounce.
