7th Grade > Chemistry
FIBRE TO FABRIC MCQs
Total Questions : 116
| Page 7 of 12 pages
Answer: Option A. ->
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Reasoning: 2 Marks
We know that air is a poor conductor of heat. It is this attribute of air that keeps these animals warm during winter by not letting the body heat escape. Hence animals grow a natural coat of hair on their bodies during winter.
Answer: Option A. ->
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Definition: 1 Mark
Explanation: 1 Mark
Bioclip is a chemical method of shearing.
In bio-clip, a protein derived chemical is injected into sheep which makes the sheep lose its fleece. Whereas in shearing, the fleece is shaved manually.
Answer: Option A. ->
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Naming: 1.5 Marks for each question.
The sheep breeds found in India are as follows:
The Nali and Lohi breeds - Rajasthan, Punjab
The Rampur Bushair - Uttar Pradesh, Himachal Pradesh
Bhakharwal - Jammu and Kashmir
Patanwadi, Marwari breed - Gujarat
The following breeds are known for:
The Nali for Carpet wool
Patanwadi wool- Hosiery
Lohi Wool- Making clothes
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Naming: 1.5 Marks for each question.
The sheep breeds found in India are as follows:
The Nali and Lohi breeds - Rajasthan, Punjab
The Rampur Bushair - Uttar Pradesh, Himachal Pradesh
Bhakharwal - Jammu and Kashmir
Patanwadi, Marwari breed - Gujarat
The following breeds are known for:
The Nali for Carpet wool
Patanwadi wool- Hosiery
Lohi Wool- Making clothes
Answer: Option A. ->
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Explanation: 1.5 Marks
Reason: 1.5 Marks
The ethical harvesting of silk by not boiling the cocoons along with the silkworms inside but instead allowing the silkworms to become full grown Bombyx mori moths is called peace silk.
It is named peace silk because in this method the silkworms are allowed to emerge from their cocoons naturally, and die a normal death instead of being killed in a cauldron of boiling water. So it is a peaceful method of silk culture.
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Explanation: 1.5 Marks
Reason: 1.5 Marks
The ethical harvesting of silk by not boiling the cocoons along with the silkworms inside but instead allowing the silkworms to become full grown Bombyx mori moths is called peace silk.
It is named peace silk because in this method the silkworms are allowed to emerge from their cocoons naturally, and die a normal death instead of being killed in a cauldron of boiling water. So it is a peaceful method of silk culture.
Answer: Option A. ->
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Explanation of each process: 1.5 Marks
For the conversion of yarn to fabric, the two main processes used are weaving and knitting.
Weaving:
Weaving is the process of arranging two sets of yarns together perpendicular to each other to make a fabric. Fabrics are woven on looms. These looms may be operated by power or by hand.
Knitting:
Knitting is a process that makes use of a single yarn to make a piece of fabric. While knitting, a single yarn is used to make a piece of fabric.
Knitting can be done by hand or on machines.
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Explanation of each process: 1.5 Marks
For the conversion of yarn to fabric, the two main processes used are weaving and knitting.
Weaving:
Weaving is the process of arranging two sets of yarns together perpendicular to each other to make a fabric. Fabrics are woven on looms. These looms may be operated by power or by hand.
Knitting:
Knitting is a process that makes use of a single yarn to make a piece of fabric. While knitting, a single yarn is used to make a piece of fabric.
Knitting can be done by hand or on machines.
Answer: Option A. ->
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Naming animals: 0.5 Mark each
Wool comes from sheep, angora goat, yak, llama, alpaca and camels.
All these animals have a thick coat of hair or fleece, which keeps them warm. Wool is obtained from this fleece.
Sheep wool is more commonly available in India. In Tibet and Ladakh, yak wool is more common, whereas, in Jammu and Kashmir, it is the angora wool. The famous pashmina shawls come from the soft underfur of the Kashmiri goat.
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Naming animals: 0.5 Mark each
Wool comes from sheep, angora goat, yak, llama, alpaca and camels.
All these animals have a thick coat of hair or fleece, which keeps them warm. Wool is obtained from this fleece.
Sheep wool is more commonly available in India. In Tibet and Ladakh, yak wool is more common, whereas, in Jammu and Kashmir, it is the angora wool. The famous pashmina shawls come from the soft underfur of the Kashmiri goat.
Answer: Option A. ->
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All hazards: 3 Marks
Workers in the wool industry face occupational hazard by inhaling anthracis bacillus. This got a nickname as a wool sorter’s disease because it infects people who sorted wool. Inactive anthrax spores live naturally in soil and are carried in the wool of sheep.
Many people suffer from pneumonia, blood infection, and even death.
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All hazards: 3 Marks
Workers in the wool industry face occupational hazard by inhaling anthracis bacillus. This got a nickname as a wool sorter’s disease because it infects people who sorted wool. Inactive anthrax spores live naturally in soil and are carried in the wool of sheep.
Many people suffer from pneumonia, blood infection, and even death.
Answer: Option A. ->
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Each part: 1 Mark
Nylon is usually used for making parachutes and ropes for rock climbing.
This is because it is very strong and can withstand high load.
Nylon is a synthetic fibre.
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Each part: 1 Mark
Nylon is usually used for making parachutes and ropes for rock climbing.
This is because it is very strong and can withstand high load.
Nylon is a synthetic fibre.
Question 69.
State whether the following statements are True or False. If false, correct them. [5 MARKS]
(a) Yak hair is not used to make woolen fabric.
(b) In the process of obtaining wool from fleece, sorting is done after scouring.
(c) The rearing of silkworms for obtaining silk is called silviculture.
(d) In India, camels and goats are generally reared for obtaining wool.
(e) Silkworms are caterpillars of the silk moth.
Answer: Option A. ->
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Each point: 1 Mark
(a) False, Yak hair is used to make woolen fabric.
(b) True. In the process of obtaining wool from fleece, sorting is done after scouring.
(c) False, The rearing of silkworms for obtaining silk is called sericulture.
(d) False, generally sheep are reared for obtaining wool.
(e) True, Silkworms are caterpillars of the silk moth.
Answer: Option A. ->
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History of clothing: 1 Mark each
Indian clothes: 1 Mark
1. In the beginning of civilization, people used barks, leaves and animal fur as clothes.
2. When people settled down as farmers, they used woven vines and animal fleece as clothes.
3. In the next stage, flax and cotton were woven into clothes. In those times, people just draped the fabric to cover themselves.
4. People started wearing stitched clothes only after the needle was invented.
Some signature clothing items of India include turbans, saris, and dhotis.
:
History of clothing: 1 Mark each
Indian clothes: 1 Mark
1. In the beginning of civilization, people used barks, leaves and animal fur as clothes.
2. When people settled down as farmers, they used woven vines and animal fleece as clothes.
3. In the next stage, flax and cotton were woven into clothes. In those times, people just draped the fabric to cover themselves.
4. People started wearing stitched clothes only after the needle was invented.
Some signature clothing items of India include turbans, saris, and dhotis.
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