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Analytical Instrumentation MCQ Question Set 7

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1. The zero stability of vibrating condenser amplifier type pH meter is much better than a direct coupled amplifier.




2. In vibrating condenser amplifier type pH meter, to maintain good performance which of the following has to be done?




3. If an instrument fails to balance at zero, it is most likely that the electrodes are defective.




4. Which of the following is not the characteristic of ion selective electrodes?




5. In glass membrane electrode, the glass containing 11% Na2O, 18% Al2O3, 71% SiO2 is highly sensitive to which of the following ions?




6. In liquid membrane electrode, the liquid ion exchanger is held in a porous disc of _______




7. In recent liquid membrane electrodes, the porous liquid membrane is replaced with which of the following?




8. Which of the following is used in potassium electrode in liquid membrane electrodes?




9. In solid state membranes, the body of the electrodes are made of which of the following?




10. Ion selective electrode are unaffected by colour or turbidity of the solution.




11. Which of the following is not a problem of ion selective electrodes?




12. Which of the following is the effective concentration measured at the electrode head?




13. The value of activity coefficient is always in which of the following ranges?




14. Which of the following specifies the relation between ionic strength and activity coefficient?




15. The difference between measured activity and actual concentration becomes higher at higher concentration. Is this statement true or false?




16. Ion selective electrodes have ________ linear range and _________ detection limit than the pH electrode.




17. In Ammonia electrode, diffusion of dissolved ammonia occurs through the membrane until which of the following conditions occur?




18. When electrode potential response is plotted as a function of ammonia concentration on a semi-log graph, the graph obtained will be ________




19. How can samples above 1M in ammonia concentration be measured using ammonia electrode?




20. The dilution of solution must not reduce the level of ammonia below _________




21. Which of the following factors does not the reproducibility of the ammonia electrode?




22. The performance of ammonia electrode is not affected by sample colour and turbidity.




23. In fluoride ion electrode, the potential corresponding to level of the fluoride ion is described by which of the following equations when E is the measured electrode potential, Eo is the reference potential and A is the level of fluoride ions in solution?




24. What does TISAB which is used to overcome interferences stand for?




25. Which of the following causes main interference in Fluoride electrode?




26. Crystal membrane of ion selective electrode can be regenerated by washing with which of the following?




27. For fluoride electrode, the electrode response curve will not only shift but will change slope with changes in temperature.




28. Which of the following gas permeable membrane is used for ammonia gas sensing electrode?




29. Which of the following gas permeable membrane is used for carbon dioxide gas sensing electrode?




30. The response time of the biocatalytic membrane electrode is poor when used with complex organic molecules.




31. Which of the following reference electrode is placed in the solution of carbon dioxide electrode?




32. Biocatalytic membrane electrode cannot be used for the measurement of which of the following gases?




33. The biocatalytic membrane used in the ammonia selective electrode is which of the following?




34. Which of the following materials are used as a gel to which biocatalytic membrane is fixed in ammonia selective electrode?




35. The biocatalytic membrane is attached to the glass electrode using which of the following materials?




36. The response time of the biocatalytic electrode is a function of the thickness of the enzyme layer.




37. In carbon dioxide electrode, the membrane separates which of the following?




38. If a solid or liquid membrane is placed in pure water, the membrane dissolves slightly, producing an equilibrium concentration of the measured ion. This is represented as ______




39. During which of the following conditions is the blank correction not necessary?




40. During which of the following conditions is the blank correction necessary?




41. Ion analysers need calibration once in which of the following durations?




42. In ion analysers, which of the following serve the dual purpose of controlling the operating current of FET and providing current gain?




43. The presence of dirt or moisture degrades which of the following?




44. Which of the following is not a type of ground in ion analyser?




45. The timing for a microprocessor and for all signals is generated by the CPU clock.




46. Which of the following is the only operator entry required in PC-based ion analysers?




47. The analog and digital grounds are connected together in ion analysers.




48. Which of the following is not a characteristic of the immobilized enzymes?




49. Which of the following is the physico-chemical component?




50. An example of biosensor, urea electrode makes use of which of the following electrodes?