Characteristic: Length MCQs Quiz | Class 9
This is a multiple-choice quiz for Class 9 Home Science (Code 064), Unit V: Fibre and Fabric. It covers the topic of fibre length and its significant effect on the quality of yarn and fabric. Test your knowledge, submit your answers to see the results, and download the answer sheet as a PDF for future reference.
Understanding Fibre Length and Its Impact on Fabric Quality
In textiles, the length of a fibre is one of its most critical characteristics. It directly influences the manufacturing process, the properties of the yarn, and the final quality of the fabric. Fibres are broadly classified into two categories based on their length: staple fibres and filament fibres.
Key Concepts: Staple vs. Filament Fibres
- Staple Fibres: These are short fibres, measured in inches or centimeters. All natural fibres, except for silk, are staple fibres. Examples include cotton, wool, flax, and jute. Their length varies from less than an inch to several inches.
- Filament Fibres: These are long, continuous fibres that can be miles long. Silk is the only natural filament fibre. All manufactured fibres, such as polyester, nylon, and rayon, are produced as filaments.
How Fibre Length Affects Yarn Quality
The length of the fibres used has a profound effect on the characteristics of the yarn spun from them.
- Strength: Longer fibres (filaments or long-staple fibres) produce stronger yarns. This is because there are fewer fibre ends exposed, and the fibres can twist around each other more securely, creating greater cohesion.
- Uniformity: Yarns made from longer fibres are generally more uniform and even. Shorter fibres can create thicker and thinner spots in the yarn, leading to unevenness.
- Smoothness: Longer fibres result in smoother yarns because there are fewer fuzzy ends sticking out from the yarn’s surface.
How Fibre Length Affects Fabric Quality
The yarn quality, in turn, dictates the quality of the final fabric.
- Lustre (Shine): Fabrics made from long, smooth filament fibres have a higher lustre because their smooth surface reflects more light. Fabrics from short staple fibres have a duller, more matte appearance.
- Durability: Since longer fibres create stronger yarns, the resulting fabrics are generally more durable and resistant to wear and tear.
- Pilling: Pilling is the formation of small, fuzzy balls on the surface of a fabric. Fabrics made from short staple fibres are more prone to pilling because the short fibre ends can easily get tangled during rubbing and washing.
- Feel (Hand): Staple fibres often produce fabrics that feel softer, warmer, and “fuzzier” to the touch, like a cotton T-shirt or a woollen sweater. Filament fibres create fabrics that feel smooth, cool, and silky.
Comparison: Staple vs. Filament Fibre Properties
| Characteristic | Staple Fibre (e.g., Cotton) | Filament Fibre (e.g., Silk/Polyester) |
|---|---|---|
| Length | Short (inches/cm) | Very long (continuous) |
| Yarn Strength | Generally lower | Generally higher |
| Fabric Lustre | Low (matte) | High (shiny) |
| Pilling Tendency | Higher | Lower |
| Fabric Feel | Soft, fuzzy, warm | Smooth, cool, silky |
Quick Revision List
- Fibre length is a primary determinant of yarn and fabric quality.
- Short fibres are called staple; long fibres are called filament.
- Cotton and wool are staple fibres; silk and polyester are filament fibres.
- Longer fibres lead to stronger, smoother, and more uniform yarns.
- Fabrics from long fibres are more durable, lustrous, and less prone to pilling.
- Fabrics from short fibres are often softer, warmer, but more likely to pill.
Extra Practice Questions
- Explain why a silk fabric is shinier than a cotton fabric, referring to fibre length.
- If you were designing a durable uniform for heavy-duty work, would you choose a fabric made from short-staple or long-staple fibres? Why?
- What is “pilling” and which type of fibre length is more likely to cause it?
- Name the only natural filament fibre.
- Why is yarn made from longer fibres generally stronger?
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