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MCQs

Total Questions : 1113 | Page 3 of 112 pages
Question 21. Which of the following additives are added to plastics to make it impervious to X-rays?
  1.    Asbestos
  2.    Barium salt
  3.    Carborundum
  4.    Phthalic acid
 Discuss Question
Answer: Option B. -> Barium salt
Question 22. Mastication of rubber means
  1.    Its softening
  2.    A treatment to retard its deterioration due to oxidation
  3.    Improving its curing rate
  4.    Depression of its freezing point
 Discuss Question
Answer: Option A. -> Its softening
Question 23. Branched chair polymers as compared to linear polymers have
  1.    Higher melting point
  2.    Higher tensile strength
  3.    Lower density
  4.    None of these
 Discuss Question
Answer: Option C. -> Lower density
Question 24. Tubeless tyres are made of __________ rubber, which is a co-polymer of isoprene & isobutylene.
  1.    Nitrile
  2.    Silicone
  3.    Neoprene
  4.    Butyl
 Discuss Question
Answer: Option D. -> Butyl
Question 25. __________ is normally used for the manufacture of refrigerator components and transistor parts.
  1.    Polyproylene
  2.    Polystyrene
  3.    Polyester
  4.    Polyurathene
 Discuss Question
Answer: Option B. -> Polystyrene
Question 26. Pick out the wrong statement.
  1.    Linear polymers are formed from bifunctional groups only and are normally thermoplastic
  2.    Cross-linked branched chain polymers are either elastometric or thermosetting
  3.    Branching in case of cross-linked polymers caused by small amount of impurities in bifunctional monomer formulation reduces its solubility and increases the softening point
  4.    Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction
 Discuss Question
Answer: Option D. -> Dibasic acids reacts with dihydric alcohols to give polyesters using addition polymerisation reaction
Question 27. Nylon-6 as compared to nylon-66 is
  1.    Harder
  2.    More abrasion resistant
  3.    Having higher melting point
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 28. Antioxidants are added to rubber to protect it from the attack of light, heat & atmospheric ozone. Which of the following is an antioxident used in rubber?
  1.    Carbon
  2.    Alkylated diphenyl amine
  3.    Thiokol
  4.    Magnesium
 Discuss Question
Answer: Option B. -> Alkylated diphenyl amine
Question 29. Buna-S is a __________ material.
  1.    Fibrous
  2.    Plastic
  3.    Resinous
  4.    Rubbery
 Discuss Question
Answer: Option D. -> Rubbery
Question 30. Density of high density polythene is about __________ gm/c.c.
  1.    1.18
  2.    1.05
  3.    0.95
  4.    0.99
 Discuss Question
Answer: Option C. -> 0.95

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