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CBSE Questions for Class 8 Chemistry Synthetic Fibres And Plastics Quiz 8 - MCQExams.com
CBSE
Class 8 Chemistry
Synthetic Fibres And Plastics
Quiz 8
Linen fibre is obtained from __________.
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0%
chia seeds
0%
cotton seeds
0%
flax plants
0%
cotton flowers
Explanation
Linen yarn is spun from the long fibers found just behind the bark in the multi-layer stem of the flax plant. In order to retrieve the fibers from the plant, the woody stem and the inner pith, which holds the fibers together in a clump, must be rotted away.
The cellulose fiber from the stem is spinnable and is used in the production of linen thread.
So, option $$C$$ is correct.
Suhana wants to present her friend gift made from plant fiber. Which of the following will she select?
Report Question
0%
Woolen shawl
0%
Jute bag
0%
Nylon scarf
0%
Silk saree
Explanation
Jute is a long, soft, shiny vegetable fiber
that can be spun into coarse, strong threads. It is produced primarily from plants.
Wool is obtained from sheep.
Silk is obtained from the silkworm.
Nylon is a synthetic fiber that is prepared in the industry.
Therefore, the answer is a jute bag.
Which of the following fibre is obtained by flax seeds?
Report Question
0%
Silk
0%
Cotton
0%
Linen
0%
Polyester
Explanation
Flax is cultivated both for its fibre, from which linen yarn and fabric are made and for its nutritional seeds called flax seed, from which linseed oil is obtained.
Hence, option $$C$$ is correct.
The fleece of the lamb refers to ______
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0%
a popular sheep breed
0%
the white colour of the fur
0%
hairy fibres of the sheep
0%
all of the above
Explanation
The white fleece of the lamb refers to pure white coloured hairy skin of the lamb.
Animal fibers are made of :
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0%
cellulose
0%
protein
0%
fats
0%
animal cells
Explanation
Animal fibers are the second most widely used natural fibers after vegetable or plant fibers. They are generally comprised of proteins and can be potential reinforcements in composites.
Examples of this fiber include wool fiber obtained from sheep, goats, lamas, rabbits, musk oxen, etc.
Which of the following fibre is not a natural fibre?
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0%
Cotton
0%
Silk
0%
Nylon
0%
Jute
Explanation
Nylon is a man-made synthetic fibre prepared by the process of polymerization. Rest all other fibers mentioned in the options are obtained from natural sources like plants and animals.
Hence, option C is correct.
Which of the following represents correct statement(s)?
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0%
The fibres of some fabrics such as cotton, jute, silk and wool are obtained from plants and animals. These are called synthetic fibres.
0%
Cotton and jute are examples of
fibres
obtained from animals.
0%
Wool and silk
fibres
are obtained from plants.
0%
None of the above
Explanation
The correct statements will be-
(A) The fibres of some fabrics such as cotton, jute, silk and wool are obtained from plants and animals. These are called natural fibres.
(B) Cotton and jute are examples of fibres obtained from plants
.
(C) Wool and silk fibres are obtained from sheep and silkworms and not plants.
Materials which are not obtained from plants and animals are called :
Report Question
0%
synthetic fibres
0%
semi-synthetic fibres
0%
natural fibres
0%
None of the above
Explanation
Fibers that are not obtained from plants and animals and are made in a laboratory using petrochemicals are called synthetic fiber.
Hence the option A is correct.
Fabric made from which of the fibre does not get wrinkled easily?
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0%
Polyester
0%
Acrylic
0%
Nylon
0%
Rayon
Explanation
Fabric made from polyester does not get wrinkled easily. It remains crisp and easy to wash. It is quite suitable for making dress material. Polyester is a synthetic fiber.
Which of the following are examples of transparent materials?
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0%
Glass
0%
Water
0%
Plastic
0%
All of these
Explanation
Those materials that allow some light to pass through them are called transparent materials.
Glass, water, plastic(some types) are examples of transparent materials as the light can pass through them.
In India, jute is cultivated during which season?
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0%
Rainy
0%
Summer
0%
Winter
0%
Throughout the year.
Explanation
In India, jute is cultivated during the $$\text{rainy season}$$. In India, it is mainly grown in Assam, Bihar, and West Bengal.
Fibres can be classified as natural fibres and synthetic fibres.
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0%
True
0%
False
Explanation
Fibres can be classified as natural fibres and synthetic fibres.
Natural fibres are obtained from plants and animals. The examples of such fibres include cotton, jute, silk and wool.
Synthetic fibres are made from chemical substances, which are not obtained from plant or animal sources. Examples include polyester, nylon and acrylic.
Which of the following object(s) is/are made of plastics?
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0%
Buckets
0%
Lunch boxes
0%
Toys
0%
Water containers
0%
All of the above
Explanation
All of them are made of plastics because plastic is durable, non-corrosive, light in weight, and inexpensive. Thus buckets, lunch boxes, toys, water containers, pipes, etc. are made up of plastic.
Hence, option $$E$$ is correct.
Which of the following represents natural fibres?
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0%
wool, cotton, nylon, jute
0%
jute, silk, rayon, wool
0%
silk, cotton, wool, jute
0%
silk, jute, cotton, polyester
Explanation
Natural fibres are obtained from natural sources like plants animals.
Examples of Natural fibres are silk, cotton, wool and jute.
Rayon is a semi-synthetic fibre.
Nylon and polyester are synthetic fibres.
Which of the following is known as artificial silk?
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0%
Rayon
0%
Nylon
0%
Polyester
0%
Acrylic
Explanation
Rayon is known as artificial silk because it has properties similar to silk.
Which of the following fiber can be drawn into very fine fibers that can be woven like any other yarn?
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0%
Terylene
0%
Rayon
0%
Acrylic
0%
Nylon
Explanation
$$\text {Terylene}$$ is a popular polyester. It can be drawn into very fine fibers that can be woven like any other yarn.
Which of the following material is not used in making plate?
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0%
Steel
0%
Glass
0%
Plastics
0%
Leather
Explanation
Steel, glass, plastics are used in making plates.
Leather is used for making clothes and shoes.
The fibre which gives smell of plastic is:
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0%
rayon
0%
silk
0%
wool
0%
nylon
Explanation
Nylon fibre gives smell of plastic.
This is because it is very similar to plastic.
Rayon, Wool, and Silk are the natural polymers which do not have plastic like smell.
State, whether the following statements are True or False.
The bakelite is a thermosetting plastic.
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0%
True
0%
False
Explanation
Thermosetting plastics are those which when moulded once can not be softened by heating.
Bakelite and melamine are examples of the thermosetting plastic. Bakelite is a poor conductor of heat and electricity. It is used in the preparation of electrical switches, handles of various utensils, etc.
Discovery of nylon is associated with:
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0%
Newyork and London
0%
Newyork and Longuet
0%
Nyholm and London
0%
None of these
Explanation
One of the interpretations is that “nylon” came from “New York” and “London” because two chemists thought up the word on an intercontinental flight from one of the cities to the other.
So, the answer is option $$A$$.
Which among the following is not the example of natural polymer?
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0%
Wool
0%
Silk
0%
Nylon
0%
Amber
Explanation
The example of Natural polymers is:- wool, silk, amber, cellulose, etc.
The example of synthetic polymers is:- Nylon, polyester, etc.
Polypropylene is not used in:
Report Question
0%
clothes
0%
ropes
0%
heat resistance plastics
0%
parachute ropes
Explanation
Polypropylene (PP) is a thermoplastic “addition polymer” made from a combination of propylene monomers. It is used in a variety of applications, like manufacturing, packaging for consumer products, plastic parts for various industries including the automotive industry, special devices like living hinges, and textiles.
So, option C is correct.
State, whether the following statements are True or False.
Terylene is a polyester polymer.
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0%
True
0%
False
Explanation
Yes,
Terylene
is the generic name for all long-chain fiber-forming polyester with recurring ester groups.
Plastic containers can resist decomposition for:
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0%
5 years
0%
10 years
0%
1000 or more years
0%
200 years
Explanation
Plastic is a polymer. Plastics have different types of arrangements in them some plastics have linear types of arrangements while some have branched types of arrangements. So depending upon the type of arrangements of plastics its decomposition time is measured.
Plastic
waste is one of many types of wastes that
take
too
long to decompose
. P
lastic
items can
take
up to 1000 years or more years to
decompose
in landfills.
Option $$C$$ is correct.
Polycot is obtained by mixing
Report Question
0%
nylon and wool
0%
polyester and wool
0%
nylon and cotton
0%
polyester and cotton
Explanation
$$\text{Polycot is obtained by mixing polyester and cotton.}$$
Synthetic fibre is formed by a combination of chain of small units called the polymers. The synthetic polyester fibre is spun in combination with the natural cotton fibre to produce the blended material called the polycot or cotton-blended polyester.
Acrylic resins are.
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0%
Colourless and transparent
0%
Dark brown and thermosetting
0%
Dark brown and thermoplastic
0%
White like milk
Thermosetting plastics are:
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Soluble in water
0%
Soluble in alcohol
0%
Soluble in benzene
0%
Insoluble
Explanation
Thermosetting plastics are inelastic, brittle, strong and rigid, strength comes from cross-linking and they do not soluble in organic solvent.
Hence, option $$D$$ is correct.
‘Rayon’ is:
Report Question
0%
Natural silk
0%
Artificial silk
0%
Natural plastic or rubber
0%
Synthetic plastic
Explanation
Rayon is known as artificial silk. (Artificial silk or art silk is any synthetic fiber that resembles silk, but typically costs less to produce.)
It has properties similar to silk. It was obtained by chemical treatment of wood pulp. It is a man-made fiber. It is cheaper than silk and can be woven like silk fibers.
Hence, option $$B$$ is correct.
Which of the following is a source of rayon?
Report Question
0%
Wool
0%
Wood pulp
0%
PET
0%
Silk
Explanation
$$\text{Wood pulp is a source of rayon.}$$ Rayon is manufactured from wood pulp that in turn is a cellulose based raw material that occurs naturally. This wood pulp is transformed into a soluble compound. The fact that wood pulp is one of the key sources of rayon makes it an inexpensive fiber.
Pick the synthetic fiber out of the following?
Report Question
0%
Cotton
0%
Nylon
0%
Jute
0%
Wool
Explanation
The correct answer is B.
The source of wool is animals. Plants give cotton and jute. Nylon is a synthetic fibre.
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