Characteristic: Elasticity MCQs Quiz | Class 9

This is an MCQ quiz for Class 9 Home Science (Code 064), based on Unit V: Fibre and Fabric. The questions focus on the characteristic of elasticity, covering topics like stretch/recovery, fit, and comfort in textiles. Answer all 10 questions, submit your quiz, and download your personalized answer sheet as a PDF.

Understanding Fabric Elasticity

Elasticity is a crucial property of textile fibres and fabrics that determines their ability to stretch when a force is applied and then return to their original shape and size after the force is removed. This characteristic is fundamental to how a garment fits, feels, and performs. It directly impacts the comfort, durability, and appearance of clothing, especially in activewear, hosiery, and form-fitting apparel.

Key Concepts: Stretch and Recovery

Elasticity is often discussed in terms of two related components: stretch and recovery.

  • Stretch (or Elongation): This refers to the fabric’s ability to lengthen or extend when pulled. A fabric with high stretch can be extended significantly without breaking. This property allows for freedom of movement.
  • Elastic Recovery: This is the ability of a stretched fabric to return to its original dimensions after the stretching force is removed. High elastic recovery prevents garments from sagging, bagging, or becoming permanently deformed after wear, ensuring a consistent fit over time.

The Role of Elasticity in Fit and Comfort

The elasticity of a fabric plays a vital role in determining the fit and comfort of a garment.

  • Fit: Elasticity allows clothing to conform to the body’s contours, providing a snug yet flexible fit. This is essential for items like swimwear, leggings, and fitted tops. Without elasticity, such garments would either be too loose to stay in place or too tight to allow for movement.
  • Comfort: Elastic fabrics move with the body, reducing constriction and pressure points. This ‘give’ in the fabric accommodates body movements like bending, sitting, and reaching, making the wearer feel more comfortable throughout the day. It also helps the garment maintain its shape, preventing uncomfortable bunching or sagging.

Fibre Elasticity Comparison

Different fibres have varying degrees of natural elasticity. Synthetic fibres are often engineered to have superior elastic properties.

Fibre Type Elasticity Level Common Uses
Spandex (Lycra/Elastane) Very High Sportswear, swimwear, leggings, denim blends
Wool Good (Natural) Sweaters, suits, socks
Nylon Good Hosiery, activewear, lingerie
Cotton Low T-shirts, jeans (often blended with spandex)
Linen Very Low Summer clothing, trousers (creases easily)

Quick Revision Points

  • Elasticity: The ability of a material to stretch and return to its original shape.
  • Stretch: The capacity to elongate under tension.
  • Recovery: The ability to bounce back after being stretched.
  • High Elasticity: Essential for a good fit, comfort, and freedom of movement.
  • Poor Recovery: Leads to garments sagging or losing their shape permanently.
  • Key Fibres: Spandex is the benchmark for high elasticity. Wool has the best natural elasticity. Cotton and linen have very low elasticity.
  • Fabric Construction: Knitting generally produces more elastic fabrics than weaving, even with the same yarn.

Extra Practice Questions

  1. Explain why a small percentage of spandex (e.g., 2-5%) is often blended with cotton for making jeans.
  2. Compare the elasticity of a woven cotton shirt with that of a knitted cotton T-shirt. Which one offers more comfort for movement and why?
  3. What would happen to a pair of socks made from a fibre with very poor elastic recovery after a few hours of wear?
  4. Why is good elastic recovery just as important as good stretch for a swimsuit?
  5. Describe a situation where low elasticity might be a desirable property in a fabric.