Definition: Yarn MCQs Quiz | Class 9
This quiz is for Class IX students studying Home Science (Code 064), focusing on Unit V: Fibre and Fabric. It covers the topic of yarn, specifically its meaning and the concept of yarn formation. Answer all the multiple-choice questions below and click ‘Submit Quiz’ to see your score. You can then download a PDF of your answers for revision.
Understanding Yarn and Its Formation
Yarn is the fundamental building block of fabric. Before we can weave or knit cloth, we need to convert raw fibers into a continuous, usable thread. This thread is what we call yarn. Understanding its meaning and the process of its formation is crucial in the study of textiles.
What is Yarn?
A yarn is a long, continuous length of interlocked fibers, suitable for use in the production of textiles, sewing, crocheting, knitting, weaving, embroidery, or ropemaking. It is created by twisting together staple fibers (short fibers like cotton or wool) or by grouping together filament fibers (long, continuous fibers like silk or polyester) with or without a twist.
The Concept of Yarn Formation: Spinning
The process of converting fibers into yarn is called spinning. This process involves three main steps:
- Drawing: The mass of fibers is pulled and stretched to align them in a roughly parallel direction. This creates a loose, untwisted strand called a sliver.
- Twisting: The sliver is then twisted. This twisting action binds the fibers together, giving the yarn its strength and coherence. The amount of twist affects the yarn’s properties, such as its strength, softness, and appearance.
- Winding: The finished yarn is wound onto a bobbin or cone for storage and subsequent use in fabric manufacturing.
Types of Yarn Based on Fiber Length
Yarns can be broadly classified into two categories based on the length of the fibers used to make them.
| Yarn Type | Source Fibers | Characteristics | Example |
|---|---|---|---|
| Spun Yarn (Staple Yarn) | Short staple fibers (e.g., cotton, wool, linen) | Fuzzy surface, weaker, more absorbent, less lustrous. | Cotton thread for t-shirts. |
| Filament Yarn | Long, continuous filament fibers (e.g., silk, nylon, polyester) | Smooth surface, stronger, less absorbent, more lustrous. | Polyester thread for sportswear. |
Quick Revision Points
- Fibre: The smallest visible unit of a textile product, like a single strand of cotton or wool.
- Yarn: A continuous thread made by twisting fibers together. – Fabric: A flat structure made by weaving, knitting, or felting yarns or fibers. – Spinning: The process of making yarn from fibers. – Twist: The spiral arrangement of fibers around the yarn’s axis, which provides strength. More twist generally means a stronger, harder yarn.
Practice Questions for Deeper Understanding
- Explain why twisting is a necessary step in creating spun yarn.
- Compare the feel and appearance of a fabric made from spun yarn versus one made from filament yarn.
- What would happen if you tried to make yarn from fibers without drawing them out first?
- Name two natural filament fibers and two man-made filament fibers.
- How does the amount of twist (low vs. high) impact the final characteristics of a yarn?
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