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MCQs

Total Questions : 151 | Page 11 of 16 pages
Question 101. The zero stability of vibrating condenser amplifier type pH meter is much better than a direct coupled amplifier.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 102. In vibrating condenser amplifier type pH meter, to maintain good performance which of the following has to be done?
  1.    Frequency of the vibrator should be stable
  2.    Frequency of the vibrator should be constant
  3.    Amplitude of the vibrator should be constant
  4.    Both frequency and amplitude of the vibrator should be constant and stable
 Discuss Question
Answer: Option D. -> Both frequency and amplitude of the vibrator should be constant and stable
Answer: (d).Both frequency and amplitude of the vibrator should be constant and stable
Question 103. If an instrument fails to balance at zero, it is most likely that the electrodes are defective.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 104. In glass membrane electrode, the glass containing 11% Na₂O, 18% Al₂O₃, 71% SiO₂ is highly sensitive to which of the following ions?
  1.    Sodium
  2.    Hydrogen
  3.    Nitrogen
  4.    Chlorine
 Discuss Question
Answer: Option A. -> Sodium
Answer: (a).Sodium
Question 105. Which of the following is not the characteristic of ion selective electrodes?
  1.    It is fragile
  2.    Easy to use
  3.    Available in different sizes and shapes
  4.    It is insensitive to many ions
 Discuss Question
Answer: Option A. -> It is fragile
Answer: (a).It is fragile
Question 106. Ion selective electrode are unaffected by colour or turbidity of the solution.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 107. Which of the following is not a problem of ion selective electrodes?
  1.    Interference with other ions
  2.    Output is influences by ionic strength
  3.    Drift in electrode potential during a sequence of measurements
  4.    Can measure only positive ions
 Discuss Question
Answer: Option D. -> Can measure only positive ions
Answer: (d).Can measure only positive ions
Question 108. Which of the following specifies the relation between ionic strength and activity coefficient?
  1.    Directly proportional
  2.    Inversely proportional
  3.    Equal
  4.    No particular relation
 Discuss Question
Answer: Option B. -> Inversely proportional
Answer: (b).Inversely proportional
Question 109. The value of activity coefficient is always in which of the following ranges?
  1.    Zero
  2.    Less than zero
  3.    Less than 1
  4.    Greater than 1
 Discuss Question
Answer: Option C. -> Less than 1
Answer: (c).Less than 1
Question 110. Which of the following is the effective concentration measured at the electrode head?
  1.    Selectivity coefficient
  2.    Ionic strength
  3.    Activity
  4.    Activity coefficient
 Discuss Question
Answer: Option C. -> Activity
Answer: (c).Activity

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