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MCQs

Total Questions : 3103 | Page 7 of 311 pages
Question 61. Main product in calcium carbide-water reaction is
  1.    Ca(OH)₂
  2.    C₂H₂
  3.    CO₂
  4.    CaCO₃
 Discuss Question
Answer: Option B. -> C₂H₂
Question 62. Carboxymethyl cellulose (CMC) is added in detergents to
  1.    Prevent redeposition of soil on cleaned surface
  2.    Act as optical brightening agent
  3.    Inhibit corrosion in washing machines made of aluminium
  4.    None of these
 Discuss Question
Answer: Option A. -> Prevent redeposition of soil on cleaned surface
Question 63. CaCl(OCl) is the chemical formula of
  1.    Hypo
  2.    Bleaching powder
  3.    Plaster of paris
  4.    Aqua regia
 Discuss Question
Answer: Option B. -> Bleaching powder
Question 64. Which of the following is used as a coagulant in water treatment?
  1.    Chloramine
  2.    Chlorine
  3.    Ferrous sulphate
  4.    Hydrogen peroxide
 Discuss Question
Answer: Option C. -> Ferrous sulphate
Question 65. Coal tar is used as a
  1.    Binding material for coal briquettes
  2.    Fuel in rotary kiln
  3.    Binder in making carbon electrodes
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above
Question 66. The process involved in converting rubber into a thin sheet or coating it on fabric is called
  1.    Extrusion
  2.    Mastication
  3.    Calendering
  4.    Valcanisation
 Discuss Question
Answer: Option C. -> Calendering
Question 67. Raw material used in alcohol distilleries in India is
  1.    Molasses
  2.    Benzol
  3.    Methylated spirit
  4.    None of these
 Discuss Question
Answer: Option A. -> Molasses
Question 68. Fermentation of molasses to produce ethyl alcohol is done at __________ °C
  1.    20 - 30
  2.    < - 5
  3.    100 - 150
  4.    250 - 300
 Discuss Question
Answer: Option A. -> 20 - 30
Question 69. The end bleaching agent used to move last traces of colour bodies from the pulp is
  1.    Chlorine dioxide (ClO₂)
  2.    MgO
  3.    SO₂ gas
  4.    Mercaptans
 Discuss Question
Answer: Option A. -> Chlorine dioxide (ClO₂)
Question 70. Styrene-butadiene-rubber (SBR) as compared to natural rubber has
  1.    Poorer tensile strength
  2.    Poorer resistance to oxidation
  3.    Greater amount of heat build-up under heavy loading
  4.    All of the above
 Discuss Question
Answer: Option D. -> All of the above

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