Question

Soft silk yarn is strong as compared to:
A.Cotton
B.Jute
C.Steel
D.Polyester

Answer 1

Hint:The silk filament has linear polymers parallel to one another and is crystalline. This allows more hydrogen bonds to be formed in a continuity.

Complete step by step answer:
-Silk is the strongest natural fiber. It is an elastic, lustrous protein fiber.
Tensile strength (or tenacity) is the maximum stress that a material can withstand while being stretched or pulled without breaking.
-Cotton is a moderately strong fabric. It has the tenacity of 3 to 5 g/den.
-Jute is a natural fiber with a strength more or less close to cotton. Its strength (tenacity) is 3 to 4 gm/den.
-Soft silk yarn is stronger compared to the thread of steel because it is the strongest natural fiber concerning its weight. When the equal weight of silk and steel thread is compared, the silk yarn is superior in terms of its tensile strength to steel.
-Polyester is a very important man made fiber produced with a long-chain synthetic polymer with ester. The tenacity of polyester is 5 to 7 g/den.

Thus, the correct answer is (C) i.e. Steel.

Note:
-The rearing of silkworms for obtaining silk is called sericulture.
-Different types of silk are mulberry silk, tussar silk, eri silk, and moonga silk, the most common one being mulberry silk. They are different textures and are obtained from different varieties of silk moths.
-Silk is more heat resistant than any other fabric.
-It is a flexible material that can quickly retake its original shape after deformation.
-The silk thread or yarn is obtained from the silk moth’s cocoon.
-Silk is the only natural fiber which is found in filament form.
-Because of its crystalline nature, the silk polymer cannot have much movement, if silk textile is in its stretched state.