Tag: chemistry

Questions Related to chemistry

__________ is a synthetic fibre used for making artificial woollen clothes. 

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

  1. Acrylic

  2. Polyester

  3. Fibre

  4. Cotton

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Correct Option: A

Which of the following changes came regarding dressing styles after 18th century?

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

  1. People dressed according to their regional codes

  2. People could use styles and materials that were drawn from other cultures and locations

  3. Dressing was limited by the types of clothes and the cost of material available in their region

  4. Clothing styles were strictly regulated by class, gender or status

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Correct Option: B
Explanation:

People could use style's and materials that were drawn from other culture and locations. These are the changes came regarding dressing styles after $18^{th}$ century.

State True or False :


It is risky to wear synthetic clothes while working in the kitchen.

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: A
Explanation:

The given statement is true.


It is risky to wear synthetic clothes while working in the kitchen. Synthetic fibre may melt on heating.

Match the column I with column II and mark the appropriate choice.

Column I Column II
(A) Natural polymer (i) Rayon
(B) Addition polymer (ii) Bakelite
(C) Copolymer (iii) Silk
(D) Semi-synthetic polymer (iv) Neoprene
chemistry animal fibre synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. (A) $\rightarrow$ (i), (B) $\rightarrow$ (ii), (C) $\rightarrow$ (iv), (D) $\rightarrow$ (iii)

  2. (A) $\rightarrow$ (iii), (B) $\rightarrow$ (iv), (C) $\rightarrow$ (ii), (D) $\rightarrow$ (i)

  3. (A) $\rightarrow$ (ii), (B) $\rightarrow$ (iii), (C) $\rightarrow$ (i), (D) $\rightarrow$ (iv)

  4. (A) $\rightarrow$ (iv), (B) $\rightarrow$ (i), (C) $\rightarrow$ (iii), (D) $\rightarrow$ (ii)

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Correct Option: B
Explanation:
 Natural rubber  (iii)
 Addition polymer  (iv)
 Copolymer  (ii)
 Semi-synthetic polymer  (i)

Natural polymer-These polymers are found in plants and animals. Examples are proteins, cellulose, starch, resins rubber and rayon.

The correct option is [B].

Which of the following is not a natural polymer?

chemistry animal fibre synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. Starch

  2. Nucleic acid

  3. Polystyrene

  4. Protein

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Correct Option: C
Explanation:

Polystyrene is made of styrene monomer which is a synthetic polymer. The monomer is a liquid petrochemical.

Polystyrene are used in making CD, jewel cases, expanded polystyrene (EPS) Foam products from Foam cups to Foam coolers, etc.

The naturally occurring polymer among the following is:

chemistry animal fibre synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. Rayon

  2. Nylon - $6$

  3. Decron

  4. Proteins

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Correct Option: D
Explanation:

NATURAL  POLYMER  -  The polymers found in nature, i.e., from plants & animals are known as natural polymers.
RAYON - Rayon is classified as semisynthetic polymer, as it is manufactured from naturally occuring polymers. It is purified from cellulose.
NYLON - $6$  -  Nylon - $6$ is a synthetic polymer, obtained by heating caprolactum with water at high temp.
DACRON  -  It is also a synthetic polymer. It is formed by interaction of ethylene glycol & terephthalic acid.
PROTEINS  -  Proteins are large macromolecules, containing one or more chains of amino acids. They are held together by peptide bonds. Amino acids are found in living organisms. Hence, they are natural polymer.

Cellulose is a polymer of:

chemistry animal fibre synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. $\alpha -$ galactose

  2. $\alpha -$ glucose

  3. $\beta -$ galactose

  4. $\beta-$glucose

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Correct Option: D
Explanation:

Cellulose is an organic compound consisting of a linear chain of several hundred to over ten thousand $\beta$ (1 $\rightarrow$4) linked $D - glucose$ units.

The S in Buna- S refers to:

chemistry animal fibre synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. sulphur

  2. styrene

  3. sodium

  4. just a trade name

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Correct Option: B
Explanation:

The S in Buna- S refers to styrene. Buna stands for butadiene and Na for sodium.
Buna-S refers to styrene Butadiene Rubber (SBR). It is copolymer of buta-1,3-diene and styrene in the ratio of 3:1 in the presence of sodium.

Among the following, a natural polymer is____________.

chemistry animal fibre synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. cellulose

  2. PVC

  3. teflon

  4. polyethylene

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Correct Option: A
Explanation:

Among the following, cellulose is a natural polymer. It is a polysaccharide.

The soft silk yarn is as strong as compared to:

chemistry animal fibre synthetic fibres & their characteristics processing of fibres synthetic fibres and its types

  1. Cotton

  2. Jute

  3. Steel

  4. Polyster

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Correct Option: C
Explanation:

Silk is an elastic, lustrous protein fiber. The soft silk thread is as strong as a comparable steel thread.