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MCQs

Total Questions : 515 | Page 2 of 52 pages
Question 11. Polypropylene compared to polythene is
  1.    harder
  2.    stronger
  3.    lighter
  4.    all (a), (b) and (c)
 Discuss Question
Answer: Option D. -> all (a), (b) and (c)
Answer: (d).all (a), (b) and (c)
Question 12. 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.
Answer: (c).initial hydrolysis of silicone monomer.
Question 13. Vulcanisation of raw rubber makes it
  1.    soft
  2.    less elastic
  3.    plastic
  4.    tacky
 Discuss Question
Answer: Option B. -> less elastic
Answer: (b).less elastic
Question 14. Diphenylamine is added to rubber to
  1.    valcanise it.
  2.    protect it from deterioration on exposure to air.
  3.    make it non-inflammable.
  4.    make it thermosetting.
 Discuss Question
Answer: Option B. -> protect it from deterioration on exposure to air.
Answer: (b).protect it from deterioration on exposure to air.
Question 15. Buna-S is also called
  1.    polyurathane
  2.    SBR
  3.    teflon
  4.    bakelite
 Discuss Question
Answer: Option B. -> SBR
Answer: (b).SBR
Question 16. Which one contains maximum percentage of Al₂O₃ ?
  1.    Firebrick
  2.    Sillimanite
  3.    Magnesite
  4.    Aluminous firebrick
 Discuss Question
Answer: Option B. -> Sillimanite
Answer: (b).Sillimanite
Question 17. Zirconia refractory
  1.    does not react with basic slags.
  2.    is produced from baddeleyite.
  3.    can not be used as an insulator.
  4.    has poor electrical conductivity at high temperature.
 Discuss Question
Answer: Option B. -> is produced from baddeleyite.
Answer: (b).is produced from baddeleyite.
Question 18. Cold crushing strength of ordinary fireclay brick is about 950 kg/cm² . On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as __________ kg/cm² .
  1.    450
  2.    250
  3.    150
  4.    65
 Discuss Question
Answer: Option D. -> 65
Answer: (d).65
Question 19. Insulating refractories should have
  1.    high porosity
  2.    low thermal conductivity
  3.    both (a) and (b)
  4.    neither (a) not (b)
 Discuss Question
Answer: Option B. -> low thermal conductivity
Answer: (b).low thermal conductivity
Question 20. Which of the following does not occur during firing/burning of refractories ?
  1.    Removal of water of hydration.
  2.    Vitrification.
  3.    Decrease in crushing strength.
  4.    Development of stable mineral form.
 Discuss Question
Answer: Option C. -> Decrease in crushing strength.
Answer: (c).Decrease in crushing strength.

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