Characteristic: Shrinkage MCQs Quiz | Class 9
This is a multiple-choice quiz for Class IX Home Science (Code 064), Unit V: Fibre and Fabric. The questions focus on the topic of Characteristic: Shrinkage, covering important concepts like shrink behaviour and its care implications. Attempt all 10 questions and click ‘Submit Quiz’ to see your score. You can also download a PDF of your answers after completing the quiz.
Understanding Fabric Shrinkage
Fabric shrinkage is the process in which a piece of fabric becomes smaller than its original size, usually through the process of washing, drying, or steaming. It is a critical characteristic to understand for proper garment care and selection. Shrinkage primarily occurs due to the release of tension that is applied to yarns and fabrics during the manufacturing process.
Key Concepts in Shrink Behaviour
The way a fabric shrinks depends on its fiber content, weave, and finishing processes. There are several types of shrinkage:
- Relaxation Shrinkage: This occurs when a fabric is first immersed in water. The water relaxes the fibers, releasing the manufacturing tension and causing them to return to a more natural, shorter state. This is very common in natural fibers like cotton and linen and usually happens most significantly during the first wash.
- Progressive Shrinkage: This type of shrinkage happens gradually over several wash and dry cycles. It is caused by the continuous mechanical stress from washing and tumbling, which slowly compacts the fabric structure.
- Felting Shrinkage: This is unique to animal hair fibers like wool. Wool fibers have microscopic scales on their surface. When exposed to heat, moisture, and agitation (like in a washing machine), these scales interlock and mat together, causing the fabric to shrink drastically and irreversibly. This process is called felting.
Care Implications for Preventing Shrinkage
Proper care is essential to minimize or prevent unwanted shrinkage. Understanding care labels and following best practices can significantly extend the life and fit of your garments.
- Read the Care Label: This is the most important step. The label provides manufacturer-tested instructions on washing temperature, drying methods, and ironing.
- Control Water Temperature: Hot water is a major contributor to shrinkage, especially for natural fibers. Washing in cold or cool water is the safest option for delicate or shrink-prone fabrics.
- Choose Gentle Washing Cycles: Less agitation means less mechanical stress on the fibers, reducing the risk of both progressive and felting shrinkage.
- Be Cautious with Drying: High heat from a tumble dryer is a primary cause of shrinkage. Air drying (line drying or flat drying) is the best method to prevent this. If you must use a dryer, select a low-heat or no-heat (air fluff) setting and remove the garment while it is still slightly damp.
- Pre-Shrunk Fabrics: Look for labels that say “pre-shrunk” or “sanforized.” This indicates the fabric has undergone a controlled shrinking process during manufacturing to minimize further shrinkage.
Shrinkage Properties of Common Fabrics
| Fabric | Shrinkage Tendency | Primary Cause | Recommended Care |
|---|---|---|---|
| Cotton | High | Heat and moisture (Relaxation) | Wash in cold water, tumble dry low or air dry. |
| Wool | Very High | Heat, moisture, agitation (Felting) | Hand wash cold or dry clean. Dry flat. |
| Silk | Moderate | Moisture and heat | Hand wash cold, air dry away from direct sunlight. |
| Polyester/Nylon | Very Low | Resistant to shrinkage | Machine washable, generally stable in the dryer. |
Quick Revision Points
- Shrinkage is the reduction of fabric dimensions.
- Natural fibers (cotton, wool) shrink more than synthetic fibers (polyester).
- Heat, moisture, and agitation are the main causes of shrinkage.
- Felting is an irreversible type of shrinkage specific to wool.
- Always check the care label before washing a new garment.
- Cold water washing and air drying are the safest methods to prevent shrinkage.
Extra Practice Questions
- Why is wool more susceptible to felting than cotton?
- What does the term ‘dimensional stability’ mean in relation to fabrics?
- Explain the difference between relaxation and progressive shrinkage.
- List two care instructions you would follow for a 100% cotton T-shirt to prevent shrinkage.
- Why are synthetic fabrics like polyester generally shrink-resistant?
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