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CBSE Questions for Class 7 Chemistry Fibre To Fabric Quiz 2 - MCQExams.com
CBSE
Class 7 Chemistry
Fibre To Fabric
Quiz 2
Which of the following does not yield wool?
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0%
Camel
0%
Sheep
0%
Deer
0%
Goat
Explanation
Deer does not yield wool. Camels, sheep, goats, and yaks yield wool. Wool is a natural fiber.
Silk fibres are made up of:
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0%
vitamin
0%
carbohydrates
0%
protein
0%
none of the above
Explanation
Silk
is a natural protein fiber
, some forms of which can be woven
into textiles
. The protein fiber of silk is composed mainly of fibroin
and is produced by certain insect larvae to form cocoons.
Thus, option $$C$$ is correct.
The eggs of silkworms are stored in:
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Wooden box
0%
Metal box
0%
Strips of cloth
0%
Plastic box
Explanation
A female silk moth lays about 200 eggs at a time, these eggs are stored on strips of cloth or paper and kept under hygienic conditions.
What materials were used for clothes in ancient times?
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0%
Animal skins
0%
Grass
0%
Vines
0%
Cotton
Synthetic fibers are also called as____
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0%
rayon fibres
0%
artificial or human-made fibers
0%
natural fibres
0%
collective fibres
Explanation
Synthetic fibers are also
called a
rtificial or human-made fibers since they are made by humans in factories.
Option $$B$$ is correct.
Silk fibers are made of:
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protein
0%
fat
0%
Both $$A$$ and $$B$$
0%
None of these
Explanation
Animal fibers are natural fibers that consist largely of proteins.
The silk fiber is a type of animal fiber made up of protein.
Hence option $$A$$ is correct.
Which of the following house hold articles is not made up of fibre?
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0%
Cloth
0%
Table
0%
Rope
0%
Carpet
Explanation
Table is made up of wood or wood pulp but cloth, rope and carpet are made up of various types of fibres and yarns which form these materials.
Hence, the correct option is $$\text{B}$$
The process of removing the fleece of sheep along with a thin layer of skin is called__________.
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0%
Shearing
0%
Soaring
0%
Sorting
0%
Scouring
Explanation
Sheep shearing is
the process by which the woolen fleece
of a sheep
is cut off. The person who removes the sheep's wool is called a shearer.
T
ypically each adult sheep is shorn once each year (a sheep may be said to have been "shorn" or "sheared", depending upon dialect).
Which one of the following is not a wool yielding animal?
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0%
Angora goat
0%
Sheep
0%
Buffalo
0%
Alpaca
0%
None of these
Explanation
Buffalo is not a wool-yielding animal. Hence, the correct option is C.
Silk fibres are made of a protein.
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0%
True
0%
False
Explanation
Silkworm secretes fibre made of a protein that hardens on exposure to air and becomes silk fibre.
Hence the given statement is true.
Which of the given example is not a type of silk?
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South silk
0%
Kangiwaram silk
0%
Tassar silk
0%
China silk
Explanation
Basically, silk is of two types:
$$1.$$ Mulberry silk
$$2.$$ Non-mulberry silk
Mulberry silk is again of two types:
$$1.$$ South silk
$$2.$$ Kangiwaram silk
Non-mulberry silk is again of so many types:
$$(i)$$ Tassar silk
$$(ii)$$ Eri silk
$$(iii)$$ Muga silk
$$(iv)$$ Anaphe silk
$$(v)$$ Fagara silk
$$(vi)$$ Coan silk
$$(vii)$$ Mussel silk
$$(viii)$$ Spider silk
So, china silk is not a type of silk.
What are furs?
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A bunch of threads
0%
A bunch of plastics
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A bunch of fluffy hairs
0%
None of these
Explanation
Fur is the thick, soft, and fluffy hair that covers the body of some animals.
eg. cat
Wool fibre can be obtain from_________.
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0%
sheep
0%
goat
0%
llama
0%
All of these
Explanation
Although $$sheeps$$ are associated with the production of wool, there are certain $$goats$$ that produce wool fibre. Fibres such as Mohair from Angora goats, cashmere wool from many breeds of goats. $$Llamas$$ produce very soft and lanolin free wool.
The general process that take place at sheep shearing shed is:
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rolling of sheep fibre into yarn
0%
removal of fleece
0%
separating hairs of different textures
0%
washing of sheep fibre to remove grease
Explanation
In shearing, the hair of sheep is removed along with fleece. Sheep shearing is the process by which the woolen fleece of a sheep is cut off. The person who removes the sheep's wool is called a shearer. Typically each adult sheep are shorn once each year. The annual shearing most often occurs in a shearing shed, a facility specially designed to process often hundreds and sometimes more than $$3,000$$ sheep per day.
The answer is option $$B$$.
What is fleece?
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It is the hair present on the body of sheep and yak.
0%
It is a process of removing dirt, grease, and dust from the hair of sheep.
0%
It is a process in which the cocoon's threads are processed to be used as silk.
0%
None of these.
Explanation
Fleece - it is the hair present on the body of sheep and yak.
Reeling - it is a process in which the cocoon's threads are processed to be used as silk.
Scouring - it removes dirt, grease, and dust from the hair removed from sheep.
Hence, option A is correct.
Llama and Alpaca are found in _________.
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India
0%
South America
0%
Pakistan
0%
None of these
Explanation
Llama and Alpaca are domesticated South American camelids. The wool produced from llama is very soft and lanolin free. Alpaca is known for its fibers used for knitted and woven items, similar to wool.
Reeling is a part of:
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0%
silk extraction
0%
wool extraction
0%
cotton extraction
0%
nylon extraction
Explanation
Reeling
is a process
of unwinding of silk filament from the cocoon.
Depending upon the required thickness of silk thread, filaments from a number of cocoons are combined together and reeled. It is done by special machines.
From the given examples which of the following is/are not considered as vegetable fibre?
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0%
Cotton
0%
Jute
0%
Nylon
0%
Silk
Explanation
Cotton and jute are considered as vegetable fibres.
Silk is not a vegetable fibre it is an animal fibre formed by silkworms.
Nylon is a synthetic fibre.
Hence, option $$C$$ and $$D$$ are correct.
The rearing of silkworms to obtain silk is called:
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Sericulture
0%
Horticulture
0%
Agriculture
0%
None of these
Explanation
In sericulture, silkworms are cultivated to produced silk. Although there are several commercial species of silkworms, Bombyx Mori (the caterpillar of the domesticated silk moth) is the most widely used and intensively studied silkworm.
Hence, option A is correct.
Wool fibre cannot be obtained from which of the following?
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0%
Angora
0%
Llama
0%
Alpaca
0%
Moth
Explanation
Animals that yield wool are Angora goats, Llama and Alpaca.
Silkmoth lays eggs which develop into silkworms to yield silk but not wool.
Hence, option D is correct.
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