Olympiad Test: Fibers To Fabric - 2 - Class 6 MCQ

Difference between weaving and knitting:
- Weaving:
- Process: Weaving is the process of interlacing two sets of yarns at right angles to each other to form a fabric.
- Yarns: Two sets of yarns are used in weaving.
- Technique: Weaving involves the over-under motion of yarns.
- Fabrics: Weaving produces a fabric with a more structured and stable construction.
- Types of looms: Different types of looms are used for weaving, including hand looms and power looms.
- Knitting:
- Process: Knitting is the interlooping of one or more sets of yarns.
- Yarns: One or more sets of yarns are used in knitting.
- Technique: Knitting involves the interlocking of loops of yarn.
- Fabrics: Knitting produces a fabric with more stretch and flexibility.
- Types of needles: Different types of knitting needles are used for knitting, including straight needles and circular needles.

Correct difference:
The correct difference between weaving and knitting is:
- Weaving is the process of interlacing two sets of yarns at right angles to each other to form a fabric, while knitting is the interlooping of one or more sets of yarns.

Explanation:
Cotton is stronger when it is wet due to several factors. Let's break it down:
1. Crystalline fiber:
- Cotton fibers have a crystalline structure, which means they have a highly ordered arrangement of molecules.
- This crystalline structure provides strength and stability to the fibers, making them resistant to breaking.
2. Hydrophilic in nature:
- Cotton is a hydrophilic material, meaning it has a high affinity for water and can easily absorb and retain moisture.
- When cotton fibers absorb water, they swell and become more pliable.
- The water molecules create hydrogen bonds with the cellulose molecules in the cotton fibers, increasing their strength and flexibility.
3. Cellulose layer:
- Cotton fibers are composed mainly of cellulose, a complex carbohydrate that provides structural support to plants.
- The cellulose molecules in cotton fibers form a layered structure, giving them strength and durability.
- When cotton fibers are wet, the water molecules penetrate the cellulose layers and interact with the hydrogen bonds, reinforcing the fiber structure.
4. All of them:
- The combination of the crystalline fiber structure, hydrophilic nature, and cellulose layers contribute to the increased strength of wet cotton.
- Each of these factors plays a role in enhancing the overall strength and resilience of the cotton fibers when they are exposed to moisture.
In conclusion, the correct answer is Option D: All of them. The crystalline fiber structure, hydrophilic nature, and cellulose layers collectively contribute to the increased strength of wet cotton.

Satin weave fabrics are:



Durable:
- Satin weave fabrics are known for their durability.
- They are tightly woven, which makes them resistant to wear and tear.
- Satin weaves are less prone to snagging or fraying compared to other types of weaves.



Cheap:
- Satin weave fabrics are not generally considered cheap.
- They often have a luxurious and glossy appearance, which can increase their cost.
- Satin weaves are commonly used in high-end clothing and upholstery.



Expensive:
- Satin weave fabrics are often associated with luxury and elegance.
- They are commonly used in formal attire and high-end fashion designs.
- The cost of satin weave fabrics can vary depending on the quality of the fabric and the brand.



Dull:
- Satin weave fabrics are known for their smooth and lustrous appearance.
- They have a glossy finish that gives them a luxurious and shiny look.
- Satin weave fabrics are not considered dull.

Identifying the fiber type:

The burn test conducted by Rehan can help determine whether the cloth is natural or synthetic. Based on the observations mentioned in the question, the fiber can be identified as follows:
Step 1: Snippet collection
- Rehan pulled a small snippet from the seam allowance or the end of the yarn.
Step 2: Flame test
- Rehan held the snippet with a pair of tweezers and put a flame to the end.
- After applying the flame, he then pulled it away.
Step 3: Observation
- Rehan observed that the snippet continued to burn after the flame was removed.
Conclusion:
Based on the above steps and observation, the fiber can be identified as Synthetic. This conclusion is drawn because natural fibers tend to burn and then self-extinguish, while synthetic fibers continue to burn even after the flame is removed.

Statement: Select the correct statement from the following options.
Explanation:
The correct statement can be determined by analyzing each option:
A: Jute is obtained from the stem of the jute plant.
- This statement is correct. Jute is a natural fiber that is primarily obtained from the stem of the jute plant.
B: Coir obtained from cotton is a weak fiber.
- This statement is incorrect. Coir is not obtained from cotton but from the husk of coconuts. It is a strong and durable fiber, commonly used for making ropes, mats, and brushes.
C: The process of making yarn from fiber is called weaving.
- This statement is incorrect. The process of making yarn from fiber is called spinning, not weaving. Weaving refers to the process of interlacing two sets of yarn or threads to create a fabric.
D: Both A and B.
- This statement is incorrect. Option A is correct, but option B is incorrect.
Therefore, the correct statement is A: Jute is obtained from the stem of the jute plant.

Unstitched pieces of fabric are garments that are not sewn together and can be draped or wrapped around the body. Among the options provided, both A and B can be used as unstitched pieces of fabric.
Explanation:
Both the dhoti and turban are traditional garments that are typically worn in South Asian countries. They are made from a single piece of fabric and can be draped or tied in various ways.
1. Dhoti: A dhoti is a traditional garment worn by men in India, Bangladesh, and other South Asian countries. It is a rectangular piece of unstitched cloth that is typically wrapped around the waist and legs. The dhoti can be styled in different ways based on regional customs and personal preference.
2. Turban: A turban is a type of headwear that is commonly worn by men in many cultures, including South Asian, Middle Eastern, and African communities. It is made by wrapping a long piece of fabric around the head, creating a stylish and functional head covering.
Therefore, option D, which states that both A (dhoti) and B (turban) can be used as unstitched pieces of fabric, is the correct answer. Both the dhoti and turban are versatile garments that can be draped and styled in various ways, making them suitable choices for unstitched fabric pieces.

Explanation:
The correct answer is Polyester fiber. Here's why:
Definition of Polyester fiber:
Polyester fiber is a synthetic fiber made from a polymer derived from petroleum. It is known for its durability, strength, and ability to reinforce other fibers.
Explanation:
Polyester fiber is often referred to as the "workhorse" fiber of the industry because of its numerous applications and characteristics. Here's how it satisfies the given conditions:
Strength:
Polyester fiber is known for its strength and high tensile properties. It is stronger than natural fibers like cotton and can reinforce cotton fibers when blended together.
Reinforces cotton fibers:
When polyester fibers are blended with cotton fibers, they enhance the overall strength, durability, and wrinkle resistance of the fabric. This makes it a popular choice for various textile applications, including clothing, upholstery, and bedding.
Synthetic fiber:
Polyester is a synthetic fiber, meaning it is man-made rather than derived from natural sources like plants or animals.
In conclusion, polyester fiber is the correct answer as it is known for its strength and ability to reinforce cotton fibers.

Introduction:
The process of producing man-made fibers involves three different methods, namely wet, dry, and melt. These methods are used to create fibers that are commonly used in the textile industry.
Explanation:
The process of producing man-made fibers can be broken down into the following steps:
1. Washing:
- Washing is a common step in the production of man-made fibers.
- It involves cleaning the raw materials to remove any impurities or contaminants.
- This step is crucial to ensure the quality of the final product.
2. Cleaning:
- Cleaning is another important step in the production of man-made fibers.
- It involves removing any remaining impurities or contaminants from the washed raw materials.
- This step helps to improve the overall quality and purity of the fibers.
3. Spinning:
- Spinning is the process of converting the cleaned and purified raw materials into fibers.
- It involves extruding the materials through small holes to form continuous filaments.
- This step is essential for the formation of fibers with the desired properties and characteristics.
Conclusion:
The production of man-made fibers involves three main methods: wet, dry, and melt. The process includes steps such as washing, cleaning, and spinning. These steps are crucial in ensuring the quality and purity of the fibers produced.