7th Grade > Chemistry
FIBRE TO FABRIC MCQs
Total Questions : 116
| Page 5 of 12 pages
:
Each point: 1 Mark
Manmade fibre: Terylene, Acrylic
Natural fibre: Jute, Cotton
:
Steps and Explanation: 3 Marks
Steps given below are followed to obtain wool from sheep or other wool-bearing animals:
Step 1: Shearing
The fleece (hair) of sheep is shaved off .In olden days this was done using a pair of metal blades. But nowadays machine is used to cut off the fleece. This is similar to the shaving of beardor hair. This process is called shearing. Shearing is done generally in summer so that sheep could get new hair by winter to get protection against cold.
Step 2: Scouring
Fleece, after shearing, is washed properly to remove dirt and grease. The washing of fleeceafter shearingis called scouring.
Step 3: Sorting
After scouring, fleece is sorted according to texture. This process is called sorting.
Step 4: Picking
After sorting, fluffy fibrescalled burrare picked out from hair. Burr is the fibre that gives wool.
Step 5: Dying
After sorting and picking out of burrs, these are dyed in desired colours.
Step 6: Spinning
The fibres are then straightened, combed and rolled into yarns.
Answer: Option D. -> thermocol
:
D
Fibreis a very thin, thread-like strand from which a material is made. It is categorized under two categories:
1. Natural fibres
2. Synthetic fibres
Nylon and polyester are examples of synthetic fibres and silk is a natural fibre obtained from cocoon of silkworm. Thermocol is not a thin, thread like strand. It is not a fibre.
:
D
Fibreis a very thin, thread-like strand from which a material is made. It is categorized under two categories:
1. Natural fibres
2. Synthetic fibres
Nylon and polyester are examples of synthetic fibres and silk is a natural fibre obtained from cocoon of silkworm. Thermocol is not a thin, thread like strand. It is not a fibre.
Answer: Option A. -> True
:
A
Caterpillar completely covers itself by silk fibres. This covering is known as cocoon.
:
A
Caterpillar completely covers itself by silk fibres. This covering is known as cocoon.
Answer: Option D. -> reeling
:
D
The process of taking out threads from the cocoon for use as silk is called reeling the silk.
Rearing of silk is followed by reeling.
:
D
The process of taking out threads from the cocoon for use as silk is called reeling the silk.
Rearing of silk is followed by reeling.
Answer: Option D. -> sheared
:
D
Scouring is the process of washing the sheared hair. Shearing is the first step in the processing of wool.
After shearing, the woolen fibres are thoroughly washed in big tanks to remove grease, dust, and dirt with the help of machines.
:
D
Scouring is the process of washing the sheared hair. Shearing is the first step in the processing of wool.
After shearing, the woolen fibres are thoroughly washed in big tanks to remove grease, dust, and dirt with the help of machines.
Answer: Option B. -> Dyeing
:
B
Combing is the process of preparing fibres for spinning. The fibres are dyed in various colours before combing them, as the natural fleece of sheep and goats are black, brown or white in colour.
:
B
Combing is the process of preparing fibres for spinning. The fibres are dyed in various colours before combing them, as the natural fleece of sheep and goats are black, brown or white in colour.
Answer: Option D. -> Alpaca, llama and camel
:
D
Wool is an animal fibre obtained from the hair of animals such as llama, sheep, alpaca, yak and camel.
Silk fibre is obtained from caterpillars and cat is not a source of wool.
:
D
Wool is an animal fibre obtained from the hair of animals such as llama, sheep, alpaca, yak and camel.
Silk fibre is obtained from caterpillars and cat is not a source of wool.
Answer: Option C. -> Bacteria
:
C
Wool industry is an important means of livelihood for many people in our country. But sorter's job is risky as sometimes they get infected by a bacterium, anthrax, which causes a fatal blood disease called sorter's disease.
:
C
Wool industry is an important means of livelihood for many people in our country. But sorter's job is risky as sometimes they get infected by a bacterium, anthrax, which causes a fatal blood disease called sorter's disease.
Answer: Option A. -> larvae
:
A
The silkworm is the larva or caterpillar of the domestic silkmoth.
:
A
The silkworm is the larva or caterpillar of the domestic silkmoth.
Latest Videos
Latest Test Papers
Login With Google
Old way of Login
Login With Email