Class-6 Science, Chapter-3 Fibre to Fabric, Solutions and Additional Exercises in line with NCERT book / CBSE Syllabus


Chapter 3
Fibre to Fabric
=========================================================
Additional Exercises
Exercises from Textbook
Tables from Textbook

Additional Exercises

Choose the correct answer:

(1)   Which of the following fibre is obtained from animals?
a.       Cotton
b.      Jute
c.       Silk (√)
d.      Polyester

(2)   Which of the following garment is an example of knitting?
a.       Saree
b.      Sweater (√)
c.       Lungi
d.      Shirt

(3)   Which of the following fibres is obtained from plants?
a.       Cotton
b.      Jute
c.       Acrylic
d.      Both a and b (√)

(4)   Yarns are made up of-
a.       Fabric
b.      Thread
c.       fibre (√)
d.      both a and c

Circle the odd one on the basis of given category –


(1)  Devices for making yarn- takli, chartkha, loom
(2)  Natural fibres- cotton, polyster, jute
(3)  Process of making fabric- Knitting, weaving, spinning
(4)  Animals for obtaining fibre- Sheep, goat, cow

Distinguish between:
(a)   Cotton and Silk yarn
(b)  Wool yarn and Synthetic yarn

Difference between Cotton and Silk yarn-
Cotton Yarn
Silk Yarn
Cotton yarn does not shrink or melt on burning.
Silk yarn shrinks away from the flame while burning but does not melt.
Burning cotton yarn gives the odour of burning cotton.
Burning silk yarn gives the odour of charred meat.

Difference between Wool yarn and Synthetic yarn-
Wool Yarn
Synthetic Yarn
Wool yarn shrinks while burning but does not melt.
Synthetic yarn shrinks and melts while burning.
Burning wool has a strong odour of burning hair.
Burning synthetic yarn gives odour similar to burning plastics


Fill in the blanks:

(1)  In ancient Egypt, cotton as well as flax were cultivated near the river Nile and were used for making fabrics
(2)  The thin strands of thread are made up of still thinner strands called fibres.
(3)  Charkha is a hand-operated device used for spinning.
(4)  Weaving and knitting are the processes of making fabric from yarn.
(5)  Weaving of fabric is done on looms.
(6)  Sweaters and socks are knitted.


Match the column:

Column A
Column B
Wool is obtained from
 the cocoon of silkworm.
Silk fibre is drawn from
 a hand spindle or takli.
Jute is obtained from
 the stem of the jute plant.
Cotton is obtained from
 the fleece of sheep or goat.
A simple device used for spinning is
 the fruits of cotton plant called cotton bolls.

Ans-
Column A
Column B
Wool is obtained from
 the fleece of sheep or goat.
Silk fibre is drawn from
 the cocoon of silkworm.
Jute is obtained from
 the stem of the jute plant.
Cotton is obtained from
 the fruits of cotton plant called cotton bolls.
A simple device used for spinning is
 a hand spindle or takli.

Answer these questions:

Q. What are natural fibres?

Ans- The fibres that are obtained from plants and animals are called as Natural fibres. For example cotton, jute, wool



Q. How is wool obtained?
Ans- Wool is obtained from the fleece of sheep or goat. It is also obtained from the hair of rabbits, yak and camels.



Q. What are synthetic fibres?
Ans- The fibres which are made up of chemical substances are synthetic fibres. For example polyester, nylon and acrylic.



Q. What do you understand by ginning?
Ans- Ginning is the process of separating fibres from the seeds.


Q. What do you understand by spinning?

Ans- The process of making yarn from fibre is called spinning.



Q. What do you mean by weaving?
Ans- The process of arranging two sets of Yarns together to make a fabric is called weaving.


Exercises from Textbook

Classify the following fibres as natural or synthetic

       Nylon, wool, cotton, Silk, polyester, jute


Ans-

Natural Fibres
Synthetic Fibres
Wool
nylon
Cotton
polyester
Silk

jute


State whether the following statements are true or false:


1-    A Yarn is made from fibres.                                                            (True)
2-    Spinning is a process of making fibres.                                         (False)
3-    Jute is the outer covering of coconut.                                            (False)
4-    The process of removing seed from cotton is called ginning.        (True)
5-    Weaving of yarn make a piece of fabric.                                        (True)
6-    Silk fibre is obtained from the stem of a plant.                               (False)
7-    Polyester is a natural fibre.                                                            (False)


Fill in the blanks:


Plant fibres are obtained from cotton plants and jute palnts.

Animal fibres are wool and silk.

Q. From which parts of the plant cotton and jute are obtained?
Ans- Cotton is obtained from the fruit (cotton bolls) of cotton plant.

         Jute is obtained from the stem of jute palnt.

Q. Name two items that are made from cotton fibre.

Ans- Following are two items made from cotton fibres:

(1)  Clothes
(2)  Ropes

Q. Explain the process of making yarn from fibre. “

Ans- The process of making yarn from fibre is called spinning.

         In this process, fibres are drawn out from a mass of cotton wool and twisted into yarn.

Activity / Project
You can do an activity to identify the Yarns of a fabric under the supervision of your teacher or parents. Pull out 6 to 8 yarns from fabric. Hold one end of the yarn with a tong and bring the other and over the flame of a candle observe carefully. Do the yarn shrink away from the flame? Do the Yarns melt or burn? What type of odour is given off? Note down your observations.

If these are cotton yarn, they burn but do not shrink or melt. The burning yarn gives an order similar to burning paper. Silk yarn shrinks away from the flame and burns but does not melt. It has the odour of charred meat. The wool yarn also shrinks and burns but does not melt. It has a strong odour of burning hair. The synthetic yarns shrink and burn. They all melt and give out an order similar to burning plastics.


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