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MCQs

Total Questions : 71 | Page 3 of 8 pages
Question 21. The contact time for disinfection by combined chlorine is ______________
  1.    20 minutes
  2.    30 minutes
  3.    40 minutes
  4.    60 minutes
 Discuss Question
Answer: Option D. -> 60 minutes
Answer: (d).60 minutes
Question 22. According to which of the following, organism destroyed by disinfection is proportional to organism remaining?
  1.    Hazens equation
  2.    Chicks law
  3.    Darcy’s law
  4.    Rose equation
 Discuss Question
Answer: Option B. -> Chicks law
Answer: (b).Chicks law
Question 23. Consider the following variables.
i. Concentration of disinfectant
ii. Concentration of organisms
iii. Temperature
iv. Time of contact
Disinfection is the function of which of the following variables?
  1.    i, ii
  2.    i, ii, iii
  3.    i, ii, iii, iv
  4.    ii, iii, iv
 Discuss Question
Answer: Option C. -> i, ii, iii, iv
Answer: (c).i, ii, iii, iv
Question 24. The integration of the expression of Chicks law is given by ____________
  1.    N1/N = e^kt
  2.    N1/N = kt
  3.    N1/N = k/t
  4.    N1/N = e^(-kt)
 Discuss Question
Answer: Option D. -> N1/N = e^(-kt)
Answer: (d).N1/N = e^(-kt)
Question 25. Which of the following is the expression of Chicks law?
  1.    Dy/Dt = k (N – y)
  2.    Dy/Dt = k/(N – y)
  3.    Dy/Dt = k (N + y)
  4.    Dy/Dt = k (N * y)
 Discuss Question
Answer: Option A. -> Dy/Dt = k (N – y)
Answer: (a).Dy/Dt = k (N – y)
Question 26. The number of organisms destroyed is equal to the number of organisms remaining at time t = __________
  1.    0
  2.    1
  3.    2
  4.    10
 Discuss Question
Answer: Option A. -> 0
Answer: (a).0
Question 27. The dimensional formula of rate constant used in Chicks law is ____________
  1.    1/t
  2.    1/t²
  3.    1/t³
  4.    t²
 Discuss Question
Answer: Option A. -> 1/t
Answer: (a).1/t
Question 28. The number of organisms in disinfection process can be expressed by ____________
  1.    Cⁿ *tₚ = Constant
  2.    Cⁿ / tₚ = Constant
  3.    C^q * Nₚ = Constant
  4.    C^q / Nₚ = Constant
 Discuss Question
Answer: Option C. -> C^q * Nₚ = Constant
Answer: (c).C^q * Nₚ = Constant
Question 29. For changing the concentration of disinfectant, the disinfecting efficiency is expressed by ____________
  1.    C n *t p = Constant
  2.    C n/ t p = Constant
  3.    C q * Np = Constant
  4.    C q / Np = Constant
 Discuss Question
Answer: Option A. -> C n *t p = Constant
Answer: (a).C n *t p = Constant
Question 30. The expression loge N1/N = – kt m Where m is a constant such that m>1 represents ____________
  1.    Rate of the kill will remains constant with time
  2.    Rate of the kill will increase with time
  3.    Rate of the kill will decrease with time
  4.    Rate of the kill is directly proportional to time
 Discuss Question
Answer: Option B. -> Rate of the kill will increase with time
Answer: (b).Rate of the kill will increase with time

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