MCQOPTIONS
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MCQOPTIONS
This section includes 17 Mcqs, each offering curated multiple-choice questions to sharpen your Analytical Instrumentation knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
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? |
| A. | u/v ratio |
| B. | u |
| C. | v |
| D. | f |
| Answer» D. f | |
| 2. |
In quadrupole mass spectrometer, the ratio u/v is mass dependent, where ‘u’ is the DC voltage and ‘v’ is the peak amplitude. |
| A. | True |
| B. | False |
| Answer» C. | |
| 3. |
Which of the following is used to cool the ion source? |
| A. | Liquid sodium shield |
| B. | Liquid nitrogen shield |
| C. | Water |
| D. | Freon |
| Answer» C. Water | |
| 4. |
In pyrolysis spectrometry, heating is done until which of the following is reached? |
| A. | Curie point |
| B. | Boiling point |
| C. | Until production of superheated vapour |
| D. | Until 100oC |
| Answer» B. Boiling point | |
| 5. |
In cases where differentiation is required between very similar substances, which of the following techniques making use of quadrupole principle is preferred? |
| A. | Evaporation mass spectrometry |
| B. | Pyrolysis mass spectrometry |
| C. | Plasma mass spectrometry |
| D. | Trapped ion mass spectrometry |
| Answer» C. Plasma mass spectrometry | |
| 6. |
Which of the following does not affect the resolution of the instrument? |
| A. | Changing length of electrode |
| B. | Changing slope of scan line |
| C. | Quality of machining of the rods |
| D. | Changing length of drift tube |
| Answer» E. | |
| 7. |
IN_PYROLYSIS_SPECTROMETRY_HEATING_IS_DONE_UNTIL_WHICH_OF_THE_FOLLOWING_IS_REACHED??$ |
| A. | Curie point |
| B. | Boiling point |
| C. | Until production of superheated vapour |
| D. | Until 100<sup>o</sup>C |
| Answer» B. Boiling point | |
| 8. |
In quadrupole mass spectrometer, the ratio u/v is mass dependent, where ‘u’ is the DC voltage and ‘v’ is the peak amplitude.$# |
| A. | True |
| B. | False |
| Answer» C. | |
| 9. |
Which_of_the_following_is_used_to_cool_the_ion_source?$ |
| A. | Liquid sodium shield |
| B. | Liquid nitrogen shield |
| C. | Water |
| D. | Freon |
| Answer» C. Water | |
| 10. |
In cases where a differentiation is required between very similar substances, which of the following techniques making use of quadrupole principle is preferred? |
| A. | Evaporation mass spectrometry |
| B. | Pyrolysis mass spectrometry |
| C. | Plasma mass spectrometry |
| D. | Trapped ion mass spectrometry |
| Answer» C. Plasma mass spectrometry | |
| 11. |
Which of the following does not affect resolution of the instrument? |
| A. | Changing length of electrode |
| B. | Changing slope of scan line |
| C. | Quality of machining of the rods |
| D. | Changing length of drift tube |
| Answer» E. | |
| 12. |
Which of the following has to be done to increase the resolution of the quadrupole mass spectrometer? |
| A. | Increasing distance between detector and reflectron |
| B. | Increasing difference between the individual rf accelerating stages |
| C. | Increasing the length of the drift tube |
| D. | Increasing the rod length of the electrode |
| Answer» E. | |
| 13. |
Which of the following is the heart of quadrupole instrument? |
| A. | Electrodes |
| B. | Choke |
| C. | DC potential |
| D. | Detector |
| Answer» B. Choke | |
| 14. |
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? |
| A. | Same potential with same sign |
| B. | Different potential with same sign |
| C. | Different potential with different sign |
| D. | Same potential with different sign |
| Answer» E. | |
| 15. |
The mass selection scheme uses a dc potential and not a radio frequency potential. |
| A. | True |
| B. | False |
| Answer» C. | |
| 16. |
Which of the following is not a component of quadrupole mass filter? |
| A. | Electrodes |
| B. | Choke |
| C. | DC potential |
| D. | Detector |
| Answer» E. | |
| 17. |
Which of the following is not a feature of quadrupole mass spectrometer? |
| A. | Low cost |
| B. | Light weight |
| C. | Low speed electronic scanning |
| D. | Simple in construction |
| Answer» D. Simple in construction | |