Tag: chemistry

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

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

  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
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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
  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)
Reveal answer Fill a bubble to check yourself
B Correct answer
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].

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

Which of the following is not a natural polymer?

  1. Starch

  2. Nucleic acid

  3. Polystyrene

  4. Protein
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

The naturally occurring polymer among the following is:

  1. Rayon
  2. Nylon - $6$

  3. Decron

  4. Proteins
Reveal answer Fill a bubble to check yourself
D Correct answer
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.