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MCQs

Total Questions : 1977 | Page 24 of 198 pages
Question 231. Which of the following is produced by condensation polymerisation?
  1.    Bakelite
  2.    Polythene
  3.    Poly vinyl chloride
  4.    Polystyrene
 Discuss Question
Answer: Option A. -> Bakelite
Question 232. Presence of even very minute amount (say 0.1%) of __________ in copper, reduces its electrical conductivity very seriously.
  1.    Bismuth
  2.    Arsenic
  3.    Antimony
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C
Question 233. Thermometer bulb & capillary in case of mercury filled pressure spring expansion thermometer is normally made of __________ as mercury does not amalgamate with it.
  1.    Copper
  2.    Copper alloys
  3.    Stainless steel
  4.    Monel
 Discuss Question
Answer: Option C. -> Stainless steel
Question 234. Dies for wire drawing are generally made of
  1.    Mild steel
  2.    Stainless steel
  3.    Carbides
  4.    High carbon steel
 Discuss Question
Answer: Option C. -> Carbides
Question 235. High resistance electrical heating elements/wire are not made of
  1.    Marageing steel
  2.    Nimonic alloys
  3.    Kanthal wire
  4.    Nichrome
 Discuss Question
Answer: Option A. -> Marageing steel
Question 236. The material used in the filament of electric bulbs is
  1.    Nichrome
  2.    Tungsten
  3.    Constantan
  4.    German silver
 Discuss Question
Answer: Option B. -> Tungsten
Question 237. The main purpose of galvanising iron sheets is to
  1.    Harden the surface
  2.    Increase its glossiness and lustre
  3.    Prevent the action of water
  4.    Prevent the action of oxygen
 Discuss Question
Answer: Option C. -> Prevent the action of water
Question 238. Which of the following metals in not used for coating of the base metal to guard it against corrosion?
  1.    Lead
  2.    Cadmium
  3.    Magnesium
  4.    Aluminium
 Discuss Question
Answer: Option C. -> Magnesium
Question 239. Hydrochloric acid is stored in a __________ steel vessel.
  1.    Lead lined
  2.    Rubber lined
  3.    Glass lined
  4.    Stainless
 Discuss Question
Answer: Option B. -> Rubber lined
Question 240. __________ is a donor impurity for semi-conductors.
  1.    Boron
  2.    Antimony
  3.    Gallium
  4.    None of these
 Discuss Question
Answer: Option B. -> Antimony

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