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MCQs

Total Questions : 1113 | Page 14 of 112 pages
Question 131. __________ practically possess no elasticity.
  1.    Vulcanite or ebonite
  2.    Spandex fibre
  3.    Polysulphide rubber
  4.    Epoxy resin
 Discuss Question
Answer: Option A. -> Vulcanite or ebonite
Question 132. In a linear polymer, the monomeric units are linked together to form long straight chains. The cross linked or branched chain polymers compared to linear polymers have higher
  1.    Densities
  2.    Melting point
  3.    Tensile strength
  4.    Hardness, rigidity & brittleness
 Discuss Question
Answer: Option D. -> Hardness, rigidity & brittleness
Question 133. Nylon 6 as compared to nylon 6, 6 has lower
  1.    Abrasion resistance
  2.    Thermal stability
  3.    Adhesion to rubber
  4.    Hardness
 Discuss Question
Answer: Option A. -> Abrasion resistance
Question 134. Branched chain polymers compared to linear polymers have higher
  1.    Density
  2.    Tensile strength
  3.    Melting point
  4.    Degree of irregularity in atomic packing
 Discuss Question
Answer: Option D. -> Degree of irregularity in atomic packing
Question 135. The rate controlling step in the manufacture of silicone rubber is the
  1.    Polymer termination step
  2.    Condensation of siloxane to silicone
  3.    Initial hydrolysis of silicone monomer
  4.    None of these
 Discuss Question
Answer: Option C. -> Initial hydrolysis of silicone monomer
Question 136. Tyres are made by
  1.    Injection moulding
  2.    Extrusion
  3.    Rotational moulding
  4.    Compression moulding
 Discuss Question
Answer: Option C. -> Rotational moulding
Question 137. Natural rubber is obtained from latex, which is a colloidal dispersion of rubber in water. Which of the following is used as a coagulant in latex?
  1.    Ammonium alum
  2.    Potassium alum
  3.    Both A & B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A & B
Question 138. Viscose rayon is
  1.    Cellulose nitrate
  2.    Regenerated cellulose nitrate
  3.    Regenerated cellulose acetate
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 139. Which of the following is an inorganic polymer?
  1.    Teflon
  2.    Perspex
  3.    Silicones
  4.    Bakelite
 Discuss Question
Answer: Option C. -> Silicones
Question 140. Vulcanisation of rubber
  1.    Decreases its tensile strength
  2.    Increases its ozone & oxygen reactivity
  3.    Increases its oil & solvent resistance
  4.    Converts its plasticity into elasticity
 Discuss Question
Answer: Option D. -> Converts its plasticity into elasticity

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