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MCQs

Total Questions : 3103 | Page 26 of 311 pages
Question 251. Very fine suspended and colloidal impurities are removed from water by a process called
  1.    Sedimentation
  2.    Coagulation
  3.    Disinfection
  4.    Softening
 Discuss Question
Answer: Option B. -> Coagulation
Question 252. Fumigant insecticides
  1.    Kill insects, when they eat it
  2.    Emit poisonous vapour
  3.    Are absorbed throughout the plant
  4.    None of these
 Discuss Question
Answer: Option B. -> Emit poisonous vapour
Question 253. Fusel oil is a/an
  1.    Essential oil
  2.    Extract from medicinal herbs
  3.    Mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses)
  4.    None of these
 Discuss Question
Answer: Option C. -> Mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses)
Question 254. Which of the following is a constituent of coffee?
  1.    Caffeine
  2.    Nicotine
  3.    Calgon
  4.    Lignin
 Discuss Question
Answer: Option A. -> Caffeine
Question 255. Which of the following is an endothermic reaction?
  1.    Absorption of SO₃ in 98% H₂SO₄
  2.    C + H₂O = CO + H₂
  3.    Thermal dissociation of iron pyrites
  4.    Both B and C
 Discuss Question
Answer: Option D. -> Both B and C
Question 256. Salt is added in the kettle during soap manufacture to separate
  1.    Soap from lye
  2.    Glycerine from lye
  3.    The metallic soap
  4.    The unsaponified fat from soap
 Discuss Question
Answer: Option A. -> Soap from lye
Question 257. During the absorption of HCl gas in water (to produce liquid HCl), the gas is kept above dew point to
  1.    Increase the rate of absorption
  2.    Avoid corrosion
  3.    Reduce the cooling water circulation rate
  4.    None of these
 Discuss Question
Answer: Option B. -> Avoid corrosion
Question 258. High magnesia lime is added to hot sugar cane juice (during the manufacture of sugar) to
  1.    Flocculate the impurities
  2.    Facilitate fast filtration
  3.    Both A and B
  4.    Neither A nor B
 Discuss Question
Answer: Option C. -> Both A and B
Question 259. Glauber's salt is chemically
  1.    Calcium sulphate
  2.    Potassium sulphate
  3.    Potassium chlorate
  4.    None of these
 Discuss Question
Answer: Option D. -> None of these
Question 260. Glass is
  1.    Mainly CaO
  2.    Subjected to galvanising
  3.    A super cooled liquid
  4.    All of the above
 Discuss Question
Answer: Option C. -> A super cooled liquid

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