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MCQs

Total Questions : 476 | Page 45 of 48 pages
Question 441. What is the permitted concentration of arsenic in drinking water?
  1.    10 g/l
  2.    20 g/l
  3.    30 g/l
  4.    40 g/l
 Discuss Question
Answer: Option A. -> 10 g/l
Answer: (a).10 g/l
Question 442. Which of the following is not a physical disinfection means?
  1.    Heat
  2.    Sound
  3.    Metals
  4.    UV
 Discuss Question
Answer: Option C. -> Metals
Answer: (c).Metals
Question 443. Which of the following means cannot be used for sterilisation?
  1.    Physical
  2.    Chemical
  3.    Physiochemical
  4.    Biological
 Discuss Question
Answer: Option D. -> Biological
Answer: (d).Biological
Question 444. ________ is the process where all the living micro-organisms, including bacterial spores are killed.
  1.    Disinfection
  2.    Sterilization
  3.    Incineration
  4.    Pyrolysis
 Discuss Question
Answer: Option B. -> Sterilization
Answer: (b).Sterilization
Question 445. What is the chemical or mechanical cleansing process called?
  1.    Sterilization
  2.    Disinfection
  3.    Decontamination
  4.    Sanitization
 Discuss Question
Answer: Option D. -> Sanitization
Answer: (d).Sanitization
Question 446. ______ is the process of elimination of most pathogenic micro-organisms.
  1.    Pyrolysis
  2.    Incineration
  3.    Disinfection
  4.    Sterilisation
 Discuss Question
Answer: Option C. -> Disinfection
Answer: (c).Disinfection
Question 447. What is the most effective dosage of UV to be used as a disinfectant?
  1.    20-100 mJ/cm²
  2.    10-20 mJ/cm²
  3.    100-120 mJ/cm²
  4.    130-150 mJ/cm²
 Discuss Question
Answer: Option A. -> 20-100 mJ/cm²
Answer: (a).20-100 mJ/cm²
Question 448. Which of these produce chlorite as the byproduct?
  1.    Free chlorine
  2.    Ozone
  3.    Chlorine dioxide
  4.    Combined chlorine
 Discuss Question
Answer: Option C. -> Chlorine dioxide
Answer: (c).Chlorine dioxide
Question 449. Free chlorine is used to destroy bacteria. This reaction is classified as which order reaction?
  1.    First
  2.    Pseudo first
  3.    Second
  4.    Zero
 Discuss Question
Answer: Option B. -> Pseudo first
Answer: (b).Pseudo first
Question 450. Which type does the following reaction belong to?
Chlorine dioxide added to destroy bacteria.
  1.    Accelerating rate reaction
  2.    Decelerating rate reaction
  3.    Pseudo first order
  4.    First order reaction
 Discuss Question
Answer: Option A. -> Accelerating rate reaction
Answer: (a).Accelerating rate reaction

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