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Published on: 30/07/2018
From the chapter Fibre to Fabric, some of the important questions are covered in this question paper.
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Download CBSE Class 7th Standard CBSE Science question papers, sample papers, important questions, and previous year solved papers in PDF format. Get free study materials, NCERT solutions, and exam preparation resources for Class 7th Standard CBSE Science
Questions + Answers key
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1.
The silkworm is (i) a caterpillar, (ii) a larva.
(i)
(ii)
Both (i) and (ii)
Neither (i) nor (ii)
2.
Wool fibre cannot be obtained from which of the following?
Goat
Llama
Alpaca
Moth
3.
Reeling of silk is
a process of making silk reels
spinning of silk fibres
weaving of silk cloth
the process of taking silk threads from cocoon
4.
Name some wool yielding animals
5.
Name the goats which are found in Tibet and Ladakh.
6.
Two fibres are made up of proteins. Name them.
7.
Write the maximum length of continuous silk thread that can be obtained from a cocoon.
8.
Define the term 'selective breeding'.
9.
Write the difference between natural silk and artificial silk.
10.
Write a short note on how first silk industry began in China.
11.
Cocoon is used to obtain silk thread. How?
12.
Write the different types of fibres that form the hair of sheep.
13.
Name the most common silk moth. What are the characteristics of silk fibres obtained from the Cocoons of this silk moth?
14.
Neha went to the market with her mother to buy a silk saree for her grandmother. The shopkeeper was showing sarees of different varieties of silk but her mother wanted to take only a pure silk saree and not an artificial one. Neha was confused that how to distinguish between a pure silk and an artificial silk saree. But her mother helped her in selecting a pure silk saree for her grandmother and she was quite elated about that.
Now, answer the following questions:
(a) How her mother distinguished between pure silk saree and an artificial silk saree?
(b) Is the pure silk saree more costly than an artificial one?
(c) What values are shown by Neha's mother?
15.
Hair trap a lot of _____ which is a poor _____ of heat.
16.
Lohi and nali are breeds of ______
17.
The sleeping period of silkworm is _____ hours at intervals of about six days.
18.
_______ is the largest producer of silk.
19.
Silk fibres are made up of a ______
20.
The rearing of silkworms for obtaining silk is called silviculture.
21.
The angora rabbit yields best variety of wool
22.
Silk is a natural carbohydrate fibre.
23.
Mooga is the strongest variety of wool.
1.
(c)
Both (i) and (ii)
2.
(d)
Moth
3.
(d)
the process of taking silk threads from cocoon
4.
Wool yielding animals are sheep, yak, llama, alpaca, angora goat, angora rabbit and camel.
5.
In Tibet and Ladakh, angora goats are found.
6.
Silk and wool are two fibres which are made up of proteins.
7.
The maximum length of continuous silk thread that can be obtained from a cocoon is more than that of 1000 feet (1000 to 1500 feet) continuous in length.
8.
The process of breeding of selective parents for obtaining special characters in their offspring such as soft under hair in sheep, is termed as selective breeding.
9.
Natural silk is obtained from the cocoons of silkworms and it is made up of a protein. Natural silk is an animal fibre. Artificial silk is obtained from wood pulp and it is made up of modified plant material 'cellulose.
If we perform the burning test, then natural silk fibre burns giving a smell of burning hair while artificial fibre burns giving a smell of burning paper.
10.
According to an old Chinese legend, the empress Si-Iung-Chi was asked by the emperor Huang-ti to find the cause of the damaged leaves of mulberry trees growing in their garden. The empress found white worms eating up mulberry leaves. She also noticed that they were spinning shiny cocoons around them. Accidentally, a cocoon dropped into her cup of tea and a tangle of delicate threads separated from the cocoon. This is how silk was discovered by chance. In this way, the first silk industry began in China.
11.
A pile of cocoon is used for obtaining silk fibre. The Cocoon are kept under the sun, boiled water or exposed to steam. The silk fibres separate out. The process of taking, out threads from the Cocoon for use as silk is called reeling the silk.
12.
There are following two types of fibres that form the hair to sheep
(i) The coarse beard hair.
(ii) Fine soft under hair close to the skin
13.
The most common silk moth is the mulberry silk moth. The silk obtained from the Cocoons of mulberry silk moth is called mulberry silk. Mulberry silk is soft, lustrous (shiny) and elastic and can be dyed in different colours.
14.
(a) Neha's mother took a thread of natural silk fabric and another thread of artificial silk fabric and burn them separately. The thread which burns giving a smell of burning hair will be natural silk (or pure silk). The thread which burns giving a smell a burning paper will be an artificial silk.
(b) Yes, pure silk saree is more costly than an artificial one.
(c) Neha's mother is intelligent and knowledgeable.
15.
( )
air, conductor
16.
( )
sheep
17.
( )
24
18.
( )
China
19.
( )
protein
20.
(b)
21.
(a)
22.
(b)
23.
(b)
7th Standard CBSE Syllabus & Materials
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