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MCQs

Total Questions : 71 | Page 5 of 8 pages
Question 41. Which of the following is a chemical method of disinfection?
  1.    Disinfection by heat
  2.    Disinfection by light
  3.    Metal ions
  4.    Metal ions, Alkalis and acids
 Discuss Question
Answer: Option D. -> Metal ions, Alkalis and acids
Answer: (d).Metal ions, Alkalis and acids
Question 42. Sunlight is a ________ method of disinfection.
  1.    Physical
  2.    Chemical
  3.    Mechanical
  4.    Electrical
 Discuss Question
Answer: Option A. -> Physical
Answer: (a).Physical
Question 43. The pathogenic bacteria do not last long at a pH ______
  1.    >11
  2.    <11
  3.    <8
  4.    >8
 Discuss Question
Answer: Option A. -> >11
Answer: (a).>11
Question 44. Which minor method of disinfection is effective in complete sterilization of water?
  1.    Boiling method
  2.    Excess lime treatment
  3.    Silver treatment
  4.    Ultraviolet ray treatment
 Discuss Question
Answer: Option A. -> Boiling method
Answer: (a).Boiling method
Question 45. What is the dose of lime required in the excess lime treatment?
  1.    10-20ppm
  2.    0-10ppm
  3.    5-10ppm
  4.    5-20ppm
 Discuss Question
Answer: Option A. -> 10-20ppm
Answer: (a).10-20ppm
Question 46. At what pH, the E-Coli bacteria will die in the water?
  1.    6
  2.    7
  3.    9
  4.    >9.5
 Discuss Question
Answer: Option D. -> >9.5
Answer: (d).>9.5
Question 47. The depth of water while using ultra violet ray treatment for disinfection should be ____
  1.    35cm
  2.    46cm
  3.    28cm
  4.    10cm
 Discuss Question
Answer: Option D. -> 10cm
Answer: (d).10cm
Question 48. Which method of disinfection is mainly used in rural areas?
  1.    Boiling method
  2.    Excess lime treatment
  3.    Potassium permanganate treatment
  4.    Silver treatment
 Discuss Question
Answer: Option C. -> Potassium permanganate treatment
Answer: (c).Potassium permanganate treatment
Question 49. Addition of KMnO₄ to water imparts _____ color.
  1.    Blue
  2.    Red
  3.    Pink
  4.    White
 Discuss Question
Answer: Option C. -> Pink
Answer: (c).Pink
Question 50. The dose of KMnO₄ required for disinfection of water is _______ ppm.
  1.    1-2
  2.    2-3
  3.    3-4
  4.    4-7
 Discuss Question
Answer: Option A. -> 1-2
Answer: (a).1-2

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