Tag: processing of fibres

Questions Related to processing of fibres

Synthetic fibres are obtained by :

chemistry synthetic fibres and plastics synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. chemical processing of petrochemicals

  2. chemical processing of natural fibres

  3. manual processing of petrochemicals

  4. Both A and B

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Correct Option: A
Explanation:

The compounds that are used to make synthetic fibres come from raw materials such as petroleum-based chemicals or petrochemicals. 


These materials are polymerized into a long, linear chemical that bond two adjacent carbon atoms. 

Differing chemical compounds will be used to produce different types of fibers.

Hence the correct option is A.

Synthetic fibres are better than natural fibres because :

chemistry synthetic fibres and plastics synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. they are man made

  2. they are cheaper

  3. they are eco friendly

  4. their length can be controlled

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Correct Option: B
Explanation:

Synthetic fibres are cheaper than natural fibres. The synthetic fibers are cheap because they are built from cheap raw materials and produced very efficiently; for example, nylon and polyester are mostly built from oil by-products and are efficiently produced in huge amounts. 

Explain why synthetic fibers are cheaper than natural fibers?

chemistry synthetic fibres and plastics synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. It is easy to prepare

  2. It is prepared by chemicals which are easily available.

  3. Natural fibers are obtain in less quantity.

  4. All of these

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Correct Option: D
Explanation:

Synthetic fibers are prepared by chemicals, this chemicals are available in cheap prize so that synthetic fibers can be produced in large quantity. Natural fibers are obtain from the natural sources which are present in the limited quantity.

Which of the following synthetic fiber is used in aerospace?

chemistry synthetic fibres and plastics synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. Nylon

  2. Aramid

  3. Acrylic

  4. All of above

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Correct Option: B
Explanation:

Aramid fibers are a class of heat-resistant and strong synthetic fibers. They are used in aerospace and military applications, for ballistic-rated body armor fabric and ballistic composites, in bicycle tires, and as an asbestos substitute. 

State True or False.
Synthetic fibres do not melt on heating.

chemistry synthetic fibres and plastics synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. True

  2. False

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Correct Option: B
Explanation:

Synthetic fibres melts on heating.

What cloth should you wear while cooking in the kitchen?

chemistry synthetic fibres and plastics synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. Rayon

  2. Cotton

  3. Polyester

  4. Polycot

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Correct Option: B
Explanation:

Synthetic fibers such as rayon, polyester melt on heating. Therefore it is not safe while cooking. It the clothes catch fire it can be disastrous. Cotton cloth is best and safe to wear in such conditions.

Polycot is a mixture of_____________.

chemistry synthetic fibres and plastics synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. Nylon and Wool

  2. Polyester and Cotton

  3. Nylon and Cotton

  4. Polythene and Cotton

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Correct Option: B
Explanation:

Polycot is obtained by mixing polyester and cotton.


Option B is correct.

Why is it not advisable to wear synthetic clothes while bursting fire crackers?

(i) All synthetic fibres are prepared by using raw materials of petroleum origin.
(ii) Synthetic fibres catch fire easily.

(iii) On heating, synthetic fibres melt and stick to the body of the person wearing it.

chemistry synthetic fibres and plastics synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. (i) only

  2. (ii) only

  3. (i) and (iii)

  4. (ii) and (iii)

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Correct Option: D
Explanation:

Option (D) is correct as;  Synthetic fibres catch fire easily and on heating synthetic fibres melt and stick to the body of the person wearing it.

Which among the following does not belong to synthetic fibres?

chemistry synthetic fibres and plastics synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. Jute

  2. Nylon

  3. Rayon

  4. Teflon

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Correct Option: A
Explanation:

 Jute is a long, soft, shiny vegetable fibre that can be spun into coarse, strong threads. It is produced from plants in the genus Corchorus, family Malvaceae. 

Jute is one of the cheapest natural fibers, and is second only to cotton in amount produced and variety of uses. Jute fibres are composed primarily of the plant materials, cellulose (major component of plant fibre) and lignin (major components wood fibre). It is thus a ligno-cellulosic fibre that is partially a textile fibre and partially wood. It falls into the bast fibre category (fibre collected from bast or skin of the plant) along with Kenaf, Industrial Hemp, Flax (Linen), Ramie, etc. 

Others belong to the class of Synthetic polymers as they are produced artificially by chemicals.

_______ are manufactured from a mixture of two or more different type of fibers.

chemistry synthetic fibres and plastics synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. Stalk fibers

  2. Blended fibers

  3. Vinyon

  4. Elastoester

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Correct Option: B
Explanation:

Blended fibers are manufactured from a mixture of two or more different type of fibers. Mixing fibers allows manufactures to form new textile yarns with distinct advantages. Each fiber retains its separate set of physical and aesthetic characteristics inherent in its design but the fabric acquires new characteristics depending on the type and percent of fibers used. Blends utilize the advantages of all the fibers to counteract the disadvantages of a single fiber. Synthetic fibers can be blended with natural fibers to create a material that is stronger, but more comfortable.