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CBSE Questions for Class 7 Chemistry Fibre To Fabric Quiz 3 - MCQExams.com
CBSE
Class 7 Chemistry
Fibre To Fabric
Quiz 3
Silkworm is:
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a caterpillar
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a larva
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Both A and B
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Neither A nor B
Explanation
$$\textbf{Concept: }$$Silkworm is the primary producer of silk.
$$\textbf{Correct Option: }C$$
$$\textbf{Explanation: }$$Female silk moth lays eggs, from which hatch larva which are called caterpillars or silkworms.
Which of the following does not yield wool?
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Yak
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Camel
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Goat
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Woolly dog
The term sericulture is used for ______.
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culture of bacteria.
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rearing of silkworm.
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making silk fabric from silk yarn.
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production of sarees.
Explanation
Sericulture
, or silk farming, is the rearing of silkworms for the production of raw silk.
Silk fibre is drawn from the cocoon of _________.
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butterfly
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worm
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silkworm
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both $$A$$ and $$B$$
Explanation
Silkworm, its
larvae are
fed with mulberry l
eaves, and, after the fourth moult, t
hey climb a twig placed near them and spin their silken cocoons.
This process is achieved by the worm through a dense fluid secreted from its structural glands, resulting in the fibre of the cocoon.
Hence the option C is correct.
Which of the following is an example of soft and fine wool?
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Merino
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Cotswold
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Both A and B
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None of them
Explanation
Merino is the soft and fine wool while Cotswold is coarser wool.
Which of the following is/ are correct statement(s)?
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Rearing of silk worms for obtaining silk is called sericulture.
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Sericulture is the whole process of obtaining silk starting from silk moth.
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Both of above
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None of above
Explanation
Both the statements are correct statements.
Rearing of silkworms for obtaining silk is called sericulture.
Sericulture is the whole process of obtaining silk starting from silk moth.
Which kind of wool is common in Tibet and Ladakh?
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Yak wool
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Sheep wool
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Angora wool
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Pashmina wool
Explanation
Yak fiber wool is common in Tibet and Ladakh and Angora wool is obtained from angora goats, found in hilly regions such as Jammu and Kashmir. Wool is also obtained from goat hair.
Hence, o
ption $$A$$ is the correct answer.
What plant do the silk eggs live on as they hatch?
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Raspberry leaves
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Pin Oak tree bark
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Palm tree branches
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Mulberry leaves
Explanation
Silkworm lay their eggs on the mulberry leaves and not on any leaves
in order to provide the diet for newly born silkworms.
Hence, o
ption $$D$$ is correct answer.
What is the name given to the third stage in the life cycle of silkworm?
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Egg
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Pupa
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Larva
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Cocoon
Explanation
Silkworm cycle is as follows:
$$(i)$$ Ova
$$(ii)$$ Larva
$$(iii)$$ Pupa $$\longrightarrow 3^{rd}$$ stage
$$(iv)$$ Coccon
$$(v)$$ Imago
What is occupational hazards?
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Hazards experienced at workplace
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Hazards experienced at home
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Hazards experienced at public place
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None of these
Explanation
Occupational hazards normally develops over a period of time at workplace. Such hazards are may be due to exposure to the disease causing bacteria or viruses, chemicals, dust, etc. at workplace.
During fiber making, _______ can occur.
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physical hazards
0%
chemical hazards
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biological hazards
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none of these
Explanation
The process of fibre making involves a lot of physical hazards such as physical injuries during the process, heat, noise, dust, etc.
Hence the option $$A$$ is correct.
Fibre particles can deposit in the ________.
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eyes
0%
ears
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lungs
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throat
Explanation
Fiber particles can deposit in the lungs.
This occupational disease is also known as silicosis.
Silicosis is a form of occupational lungs disease caused
by inhalation of crystalline silica dust
and is marked by inflammation a
nd scarring in the form of nodular lesions
in the upper lobes of the lungs.
It
is a type of pneumoconiosis.
Hence the option $$C$$ is correct.
In sericulture industry, do which stages of silkworm weavers buy?
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eggs of silk moth (seeds)
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tiny worms
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silk moths
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All of the above
Explanation
In sericulture industry, weavers buy the following
stages of silkworm.
eggs of silk moth (seeds), tiny worms and silk moths.
Which kind of hazards are included in occupational hazards?
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Biological
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Chemical
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Physical
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All of these
Explanation
Occupational hazards are hazards experienced in the workplace.
There are various types of occupational hazards depending on their nature namely, biological hazards, chemical hazards, physical hazards, psychosocial hazards.
Hence the option $$D$$ is correct.
Which of the following does not yield wool?
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Camel
0%
sheep
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goat
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woolly dog
Boojho went to a cloth shop. There he found a fabric which was smooth to touch, had vibrant colour and shine. The fabric could be
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Cotton
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Wool
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Silk
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Jute
Explanation
Silk is obtained from cocoon of the silkworm. It is a very shiny and smooth fibre and has vibrant colours.
Which of the following is a fibre?
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Rayon or artificial silk
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Nylon
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Acrylic
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All of the above
Explanation
Rayon or artificial silk, nylon, and acrylic represent fibre.
Polyester and cotton are also examples of fibre.
Hence, option $$D$$ is correct.
Which of the following stages in the life history of a silkmoth produces silk fibres?
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0%
0%
0%
Which of the following statements is incorrect?
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Fibron is the gummy substance that holds the two strands of sericin of a silk fibre together.
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Asbestos is the only naturally occurring long mineral fibre.
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Merino is an exotic breed of sheep.
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Hair present on body of wool-yielding animals trap a lot of air.
Explanation
Sericin is the gummy substance that holds two strands of fibroin of silk fibre together.
The rearing of silkworms to gather silk is known as _____________.
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pisciculture
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horticulture
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cocoon
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sericulture
Explanation
Sericulture is the technique in which the rearing of silkworms to gather silk is done.
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