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MCQs

Total Questions : 3103 | Page 28 of 311 pages
Question 271. Iron ore hametite is concentrated using
  1.    Electro magnetic separation mainly
  2.    Gravity separation
  3.    Froth floatation
  4.    Roasting
 Discuss Question
Answer: Option B. -> Gravity separation
Question 272. Hard water
  1.    Does not affect the lather formation by soap
  2.    Is not unfit for drinking purpose
  3.    Pollutes the water stream
  4.    All of the above
 Discuss Question
Answer: Option B. -> Is not unfit for drinking purpose
Question 273. At very high concentration of enzymes, the rate of fermentation chemical reaction is __________ the concentration of reactants.
  1.    Independent of
  2.    Directly proportional to
  3.    Inversely proportional to
  4.    Proportional to the square of
 Discuss Question
Answer: Option A. -> Independent of
Question 274. Chemical formula of BHC, which is an insecticide is
  1.    C₆H₆Cl₆
  2.    C₆Cl₆
  3.    C₆H₅Cl
  4.    C₆H₄Cl₂
 Discuss Question
Answer: Option B. -> C₆Cl₆
Question 275. Which of the following is an explosive?
  1.    Nitroglycerene
  2.    Trintrotoluene (TNT)
  3.    Cellulose nitrate
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 276. Which of the following is the most adverse factor challenging the choice of mercury electrolytic cell process for the production of caustic soda?
  1.    High cost of mercury
  2.    High specific gravity of mercury
  3.    Non-availability of high purity mercury
  4.    Pollution of water stream by mercury
 Discuss Question
Answer: Option D. -> Pollution of water stream by mercury
Question 277. Industrial production of chloroform requires acetone and
  1.    Phosgene
  2.    Calcium hypochlorite
  3.    Chlorine
  4.    Ammonium chloride
 Discuss Question
Answer: Option B. -> Calcium hypochlorite
Question 278. Yellow phosphorus is transported under
  1.    Air
  2.    Water
  3.    Nitrogen
  4.    Helium
 Discuss Question
Answer: Option B. -> Water
Question 279. Thermosetting plastic materials
  1.    Can be repeatedly melted
  2.    Is useful for melt casting
  3.    Can not be melted after forming
  4.    Is useful for spinning
 Discuss Question
Answer: Option C. -> Can not be melted after forming
Question 280. SO₂ is bubbled through hot sugar cane juice to
  1.    Act as an acidifying agent
  2.    Increase its concentration
  3.    Increase the amount of molasses
  4.    Increase the crystal size
 Discuss Question
Answer: Option A. -> Act as an acidifying agent

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