Sunday , May 31 2020
NCERT 7th Class (CBSE) Science: Fibre to Fabric – Quiz

NCERT 6th Class (CBSE) Science: Fibre to Fabric

Question: Define a fibre. What are the different. Kinds of natural fibre used to make clothes.

Answer: Fibre are thin stands of threads that are woven to make Fabric. Different kinds of natural fibres are:

  1. Animal Fibres = Eg- Wool
  2. Plant Fibres = Eg- Cotton
  3. Insect fibre = Eg- Silk

Question: What are synthetic fibre? Give two examples.

Answer: Synthetic fibre are man-made fibres made from plastic and petroleum products. For example: Nylone, Rayon etc. They are also made from chemicals.

Question: Describe the different ways of making fabric from fibre.

Answer: The different ways are:

  1. Weaving: Weaving involves making fabric by arranging two sets of yarn. It is done using a machine called loom, which can be hand operated or power operated.
  2. Knitting: Knitting involves making fabric by forming a series of connected loops of yarn by using Knitting needles or machines. Sweaters are made from wool strands by knitting.

Question: Differentiate between hemp and flax.

Answer:

Hemp:

  1. Hemp fibre are obtained from the stem of the hemp plant.
  2. It is very rough.
  3. It has a woody stem, it is long and sough.
  4. Eg- ropes, carpets, nets etc.

Flax:

  1. Fibres obtained from the stem of the flax plant are woven to make a fibric called line.
  2. It is very soft.
  3. Its stem is short and soft.
  4. It is used in the production of ropes and high quality paper.

Question: What is Ginning?

Answer: The process o separating the the cotton fibres from its seeds is called ginning.

Question: What is Retting?

Answer: The process of rotting the stems of the plants in water to remove the sticky substance and separate fibres is called retting.

Retting of jute
Retting of jute

Check Also

7th Class CBSE Science NCERT Book

Physical and Chemical Changes: 7th CBSE Science Ch 06

Physical and Chemical Changes 7th Class NCERT CBSE Science Chapter 06 Question: What kind of change is …

Leave a Reply

Your email address will not be published. Required fields are marked *