Question

Question answer

1. Cotton is a natural polymer. What is its chemical name? Write any one property as natural fibre of cotton.
2. Plastic articles are available in all possible shapes and sizes. Can you tell why? 3. A ball of dough is rolled into a flat chapatti. Name the force exerted to change the shape of the dough.​

Answer 1

1. Cotton consists of a long chain of glucose molecules and thus occurs naturally in plants and thus it is composed of pure cellulose which is the naturally occurring polymer. Thus, the correct answer is that the chemical name of cotton is cellulose.

2. Plastic articles are available in all shapes and sizes because plastic is considered to be a different material as it becomes soft on heating and becomes hard when cooled to lower temperatures. ... And thus can be made into any shape and size making it easy to create articles.

3. To make a chapatti from a ball of dough, we push the dough inward to reduce its thickness. So the forces applied are compressive forces.