7th Grade > Chemistry
FIBRE TO FABRIC MCQs
Total Questions : 116
| Page 6 of 12 pages
Answer: Option D. -> fleece
:
D
Wool is an animal fibre obtained from animals like sheep, angora goat, yak, alpaca, etc. All these animals have a thick coat of hair on their body. This coat of hair is called fleece.
:
D
Wool is an animal fibre obtained from animals like sheep, angora goat, yak, alpaca, etc. All these animals have a thick coat of hair on their body. This coat of hair is called fleece.
Answer: Option A. -> Silk
:
A
Fibres which are obtained from plants and animals are known as natural fibres. Silk is obtained from silkworms which makes it a natural fibre.
However, polyester, rayon and nylon are man-made fibres and are hence, synthetic.
:
A
Fibres which are obtained from plants and animals are known as natural fibres. Silk is obtained from silkworms which makes it a natural fibre.
However, polyester, rayon and nylon are man-made fibres and are hence, synthetic.
Answer: Option A. -> protein
:
A
Caterpillar secretes fibre made of protein which hardens on exposure to air and becomes silk fibre.
:
A
Caterpillar secretes fibre made of protein which hardens on exposure to air and becomes silk fibre.
Answer: Option B. -> rearing
:
B
Storing and maintaining the eggs laid by female silk moth is called rearing.
The process of taking out silk threads from the cocoon is called reeling.
Scouring is the process of washing and drying of fleece to remove grease, dust and dirt.
:
B
Storing and maintaining the eggs laid by female silk moth is called rearing.
The process of taking out silk threads from the cocoon is called reeling.
Scouring is the process of washing and drying of fleece to remove grease, dust and dirt.
Answer: Option C. -> under hair
:
C
A sheep has two types of fibres that form its fleece, the coarse beard and the fine soft under hair which grows close to the skin. The soft under hair fibre is used to make wool.
:
C
A sheep has two types of fibres that form its fleece, the coarse beard and the fine soft under hair which grows close to the skin. The soft under hair fibre is used to make wool.
Answer: Option A. -> Pupa
:
A
In the pupa stage, the caterpillarweaves a net to hold itself.The caterpillar covers itself completely with silk fibre and turns into a pupa, this covering is known as the cocoon. The moth continues to develop within the cocoon.The silk thread or yarn is obtained from the silk moth’s cocoon.
:
A
In the pupa stage, the caterpillarweaves a net to hold itself.The caterpillar covers itself completely with silk fibre and turns into a pupa, this covering is known as the cocoon. The moth continues to develop within the cocoon.The silk thread or yarn is obtained from the silk moth’s cocoon.
Answer: Option A. -> Pupa
:
:
Selective breeding is a process of selecting the parents for obtaining special characters in the offspring. Selective breeding is done to have sheep with soft hair.
Answer: Option A. -> Pupa
:
:
Explanation: 1 Mark each
1) White fleece means the hairy skin which is white in colour.
2) The hairy skin called fleece has wool in black sheep.
Answer: Option A. -> Pupa
:
:
Difference:1 Mark
Example: 1 Mark
The fibres which are obtained from plants and animals are called natural fibres. example: jute and wool
The fibres which are made by human beings are known as man-made fibres. Example: rayon
Answer: Option A. -> Pupa
:
:
Order of processing 1 Mark
Definition and explaination: 2 Marks
The order is as follows:
Fibres, Yarn, Fabric.
Fibre: A thread or filament from which a vegetable tissue, mineral substance, or textile is formed.
Yarn: Yarn is a long continuous length of interlocked fibres suitable for use in the production of textiles, sewing, crocheting, knitting, weaving, embroidery, and ropemaking.
Fabric: Cloth produced by weaving or knitting textile fibres.
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