Question

Length, strength, flexibility, uniformity and _______ are primary properties that are necessary for a fibre to be called a textile fibre.

• A. Density
• B. Elasticity
• C. Cohesiveness
• D. Resiliency

Hint:

Think of Primary Properties as the "Must-Haves" to make a yarn. Without Cohesiveness, fibers would just slip past each other instead of forming a solid thread.

Answer 1

The Correct Option is C

Concept: To be suitable for spinning into yarn and subsequently into fabric, a fiber must possess certain essential physical characteristics known as primary properties.

Step 1: Identifying Primary Properties: The standard list of primary properties for textile fibers includes:
• Length-to-width ratio: Must be long enough to be twisted.
• Tenacity (Strength): Must withstand manufacturing stresses.
• Flexibility: Must be able to drape and bend without breaking.
• Uniformity: Consistent dimensions for smooth yarn.
• Cohesiveness (3): The ability of fibers to stick together (often via friction or surface texture) when twisted into a yarn.

Step 2: Differentiating from Secondary Properties: Density, Elasticity, and Resiliency (Options 1, 2, and 4) are considered secondary properties. While they improve the quality of the fabric, they are not strictly mandatory for the basic formation of a yarn.

Step 3: Conclusion: Cohesiveness is the missing primary property in the list provided.