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Analytical Instrumentation MCQ Question Set 11

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1. Which of the following components need to be added in order to increase the resolution?




2. Which of the following is commonly varied in magnetic deflection mass spectrometer?




3. Nier-Johnson geometry involves a deflection of which of the following radians in a radial electrostatic field analyser?




4. An accuracy of 1 part in 102 has been obtained in precision mass measurements.




5. Which of the following is not a component of the time of flight analyser spectrometer?




6. Time of flight mass spectrometer has an unlimited mass range.




7. Which of the following is not an advantage of mass spectrometer?




8. All the ions entering the tube have the same kinetic energy.




9. If all the ions have the same kinetic energy how are their masses related to their velocities?




10. Which of the following is true about time of flight analyser spectrometers?




11. In the time of flight mass spectrometer, ions are formed by which of the following methods?




12. The evacuated tube is also known as which of the following?




13. The current produced by ions arriving at the collector necessitates the use of which of the following?




14. Which of the following is an ion optic device in which ions pass through a mirror and their flight is reversed?




15. Which of the following statements about mass spectrometers are not true?




16. Which of the following is placed just before the detector in a radiofrequency mass spectrometer?




17. Which of the following is applied in one or more stages where each stage is a series of three equally spaced parallel grids?




18. The alternating voltage rf voltage is applied to which of the following?




19. The rf spectrometer contains a magnet.




20. The DC ion accelerating voltage is swept from ______




21. The resolution of the Bennet tube can be improved by using which of the following?




22. In Bennet spectrometer, the rf voltage has a fixed frequency.




23. The spurious lines can be reduced to a minimum by using which of the following?




24. Which of the following is the disadvantage of using three stage tubes?




25. Which of the following is not the feature of Bennet type spectrometer?




26. The resolving power of Bennet type spectrometer is primarily based on which of the following?




27. Which of the following is not a feature of quadrupole mass spectrometer?




28. Which of the following is not a component of quadrupole mass filter?




29. The mass selection scheme uses a dc potential and not a radio frequency potential.




30. If to one pair of electrodes one potential with one sign is applied, which of the following is applied to the other pair of electrodes?




31. Which of the following is the heart of quadrupole instrument?




32. Which of the following has to be done to increase the resolution of the quadrupole mass spectrometer?




33. Which of the following does not affect the resolution of the instrument?




34. In cases where differentiation is required between very similar substances, which of the following techniques making use of quadrupole principle is preferred?




35. In pyrolysis spectrometry, heating is done until which of the following is reached?




36. Which of the following is used to cool the ion source?




37. In quadrupole mass spectrometer, the ratio u/v is mass dependent, where ‘u’ is the DC voltage and ‘v’ is the peak amplitude.




38. When a value of q is kept constant, the value of m/e is proportional to which of the following when ‘m’ is the mass number, ‘e’ is the electric charge, ‘u’ is the DC potential, ‘v’ is the peak amplitude and ‘f’ is the frequency?




39. Which of the following is not an ion transducer or detector?




40. Which of the following is similar to photo multiplier transducer?




41. Which of the following is used in places where ion currents are very low?




42. Discrete type electron multiplier transducers can provide current gain upto which of the following?




43. Continuous dynode electron multiplier transducer is a trumpet shaped device made with which of the following?




44. The potential maintained across the continuous dynode multiplier transducer is which of the following?




45. Which of the following are not the characteristics of an electron multiplier transducer?




46. Which of the following are true about dynodes used in discrete dynode electron multiplier?




47. In which of the following detectors, the collector is placed in an inclined manner?




48. Which of the following is the least sensitive ion detector?




49. Photographic plates are coated with which of the following?




50. Which of the following detectors are well suited for spark source instruments?




51. Photographic plates have greater sensitivity and resolution than electron multipliers.




52. Which of the following detectors consist of an array of glass capillaries?




53. Which of the following detectors can be used for ions with short life time?




54. ICP’s principle is similar to which of the following?




55. ICP is used to analyse samples in which of the following states?




56. Solid samples are introduced into the ICP spectrometer using which of the following?




57. Liquid samples are introduced into the ICP spectrometer using which of the following?




58. Atomisation or ionisation occurs at which of the following conditions?




59. Ions flow is pumped into the vacuum system using which of the following?




60. Which of the following is not the characteristic of ICP spectrometer?




61. ICP spectrometer is a sequential multi-element analyser that has scan times less than ____ for one sweep.




62. Double focussing section analysers offer better resolution than ICP spectrometry system.




63. The most common type of ion detector found in ICP system is which of the following?




64. Which of the following is the most accurate method of determination of elemental composition?




65. Which of the following is the disadvantage of ICP mass spectroscopy?




66. The isobaric interference is not caused in which of the following elements?




67. Which of the following is the most sensitive of the spectral methods?




68. Which of the following is the disadvantage of gas chromatography?




69. Cold tray is provided for liquid N2 or CO2 but is used only for extremely small samples.




70. Which of the following is most often used in the chromatograph in gas chromatograph MS?