Tag: chemistry

Questions Related to chemistry

Which of the following represents incorrect statement(s)?

chemistry materials of daily use classification of fibres fibres history of fabric

  1. Flax is a plant that gives natural fibres.

  2. In ancient Egypt, cotton as well as flax were cultivated near the river Nile and were used for making fabrics.

  3. In ancient times, stitching was known.

  4. All of the above.

Show answer
Correct Option: C
Explanation:

In ancient times, stitching was not known. People simply draped the fabrics around different parts of their body.

Which of the following represents incorrect statement(s)?

chemistry materials of daily use classification of fibres fibres history of fabric

  1. In ancient times, people used the bark and big leaves of trees or animal skins and furs to cover themselves.

  2. After people began to settle in agricultural communities, they learnt to weave twigs and grass into mats and baskets.

  3. Vines, animal fleece or hair were twisted together into log strands. These were woven into fabrics.

  4. The early Indians wore fabrics made out of silk that grew in the forest regions.

Show answer
Correct Option: D
Explanation:

option $D$ is correct  answer.

The existing dress codes in Europe were swept away by:

chemistry materials of daily use classification of fibres fibres history of fabric

  1. French Revolution

  2. The First World War

  3. The Second World War

  4. None of these

Show answer
Correct Option: A
Explanation:

The existing dress codes in Europe were swept away by french revolution.

Hence,
Option $A$ is correct answer.

State whether true or false ;

Cotton and wool are obtained from cotton plant and sheep respectively.

chemistry fibre to fabric: plant fibre classification of fibres fibres history of fabric

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Cotton plants are grown for fibre and their seeds can be used for preparing cooking oil. 


Wool is a kind of animal fibre taken from hair of sheep and goats. 

The quality of wool fibres is assessed based on several characteristics including fibre length, fineness, colour, cleanliness, damage and surface scales. 

Therefore, option A is correct.

Fibre is a thread or filament from which cloth is made.
chemistry fibre to fabric: plant fibre classification of fibres fibres history of fabric

  1. True

  2. False

Show answer
Correct Option: A
Explanation:
Fibre is a long and thin strand or thread from which cloth is made. 

Cloth is prepared by weaving/knitting of this thread together. Fibre can be natural or man-made. 

Natural fibres include cotton, hair, fur, silk, wool and man fibre include nylon, polyester, olefin etc.

Natural fibres are obtained from plants and animals whereas synthetic fibres are obtained by chemical processing of petrochemicals.

chemistry fibre to fabric: plant fibre classification of fibres fibres history of fabric

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Natural fibres are hairlike raw material directly obtainable from an animal, vegetable, or mineral source and convertible into non woven fabrics such as felt or paper or, after spinning into yarns, into woven cloth. A natural fiber may be further defined as an agglomeration of cells in which the diameter is negligible in comparison with the length examples: cellulose types such as cotton, wood, grains, and straw.
Synthetic fibers are fibers are human-made by chemical synthesis, as opposed to natural fibers. In general, synthetic fibers are created by extruding fiber-forming materials through spinnerets into air and water, forming a thread. These fibers are called synthetic or artificial fibers. Some fibers (such as the diverse family of rayons) are manufactured from plant-derived cellulose and are thus semi-synthetic, whereas others are totally synthetic, being made from crudes and intermediates including petroleum, coal, limestone, air, and water.
therefore option A is correct

We can obtain the fabric by:

chemistry fibre to fabric: plant fibre classification of fibres fibres history of fabric

  1. hardening

  2. setting

  3. weaving

  4. knitting

Show answer
Correct Option: C,D
Explanation:

By weaving and knitting we can obtain fabric.

State whether true or false :

Synthetic fibres are also called as artificial or human made fibres.

chemistry fibre to fabric: plant fibre classification of fibres fibres history of fabric

  1. True

  2. False

Show answer
Correct Option: A
Explanation:

Synthetic fibers are prepared by using chemicals. These are made of small units that join together to form long chains. 


Some of the examples of synthetic fibers are nylon, rayon, acrylic, polyester.
They are also called artificial or man-made or human-made fiber.

Hence, option $A$ is correct.

From this, fabric is made :

chemistry fibre to fabric: plant fibre classification of fibres fibres history of fabric

  1. filament

  2. fibre

  3. moisture

  4. plastic

Show answer
Correct Option: B
Explanation:

Fabric is made from $fibre$.

Latex is a colloidal solution of rubber particles which are:

chemistry nature of matter heterogenous mixture - colloidal solution and its properties suspensions and colloids mixtures

  1. positively charged

  2. negatively charged

  3. neutral

  4. can be negatively and positively charged.

Show answer
Correct Option: B
Explanation:

Latex is a milky fluid produced by certain plants. It consists mainly of a colloidal suspension of rubber globules in a watery liquid. Latex is a colloidal solution of rubber particles which are negatively charged.