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MCQs

Total Questions : 197 | Page 19 of 20 pages
Question 181. From melt or more concentrated solution, bulk crystallization of polymers lead to
  1.    heavy structure
  2.    spherulitic structure
  3.    round structure
  4.    strong structure
 Discuss Question
Answer: Option B. -> spherulitic structure
Answer: (b).spherulitic structure
Question 182. Polymers including those used in fibers can be crystallized from dilute solution to give
  1.    crystals
  2.    small crystals
  3.    single crystals
  4.    two crystals
 Discuss Question
Answer: Option C. -> single crystals
Answer: (c).single crystals
Question 183. Fibre properties can be predicted from knowledge of
  1.    chemistry of chain modules
  2.    6 parameters of fine structures
  3.    larger scale structural features
  4.    all of above
 Discuss Question
Answer: Option D. -> all of above
Answer: (d).all of above
Question 184. In electron microscopy, with stiffer molecules one can observe
  1.    twisted textures
  2.    fibrillar textures
  3.    wrinkled textures
  4.    random textures
 Discuss Question
Answer: Option B. -> fibrillar textures
Answer: (b).fibrillar textures
Question 185. Value of moisture regain in wood pulp is calculated to be
  1.    62
  2.    49
  3.    42
  4.    77
 Discuss Question
Answer: Option B. -> 49
Answer: (b).49
Question 186. When there is no room for branches of spherulitic structure to grow, then it becomes
  1.    typical structure
  2.    young structure
  3.    fringed micelle structure
  4.    bonded structure
 Discuss Question
Answer: Option C. -> fringed micelle structure
Answer: (c).fringed micelle structure
Question 187. In polymers, annealing requires small crystals to melt down and
  1.    reform as larger crystals
  2.    reform as smaller crystals
  3.    reform as bond
  4.    reform as molecule
 Discuss Question
Answer: Option A. -> reform as larger crystals
Answer: (a).reform as larger crystals
Question 188. What does increased chain lengths give?
  1.    better properties
  2.    worse properties
  3.    constant properties
  4.    variable properties
 Discuss Question
Answer: Option A. -> better properties
Answer: (a).better properties
Question 189. Width of complete chain of cellulose fibre is
  1.    8 x 0.0010 micrometer
  2.    8 x 0.010 micrometer
  3.    8 x 0.10 micrometer
  4.    8 x 10 micrometer
 Discuss Question
Answer: Option A. -> 8 x 0.0010 micrometer
Answer: (a).8 x 0.0010 micrometer
Question 190. All molecules in parallel crystal lattice of cellulose I without chain folding points in
  1.    opposite direction
  2.    same direction
  3.    particular direction
  4.    random direction
 Discuss Question
Answer: Option B. -> same direction
Answer: (b).same direction

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