MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 20 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. |
A pink coloured dye complex is formed when air containing NO2 is passed in an absorbing solution consisting of __________ and diamine dissolved in the acetic acid medium. |
| A. | Sulphuric acid |
| B. | Sulphonyl |
| C. | Sulphonic acid |
| D. | Sulphanilic acid |
| Answer» E. | |
| 2. |
Which of the following analyzers are used to measure trace amounts of nitrogen oxides in the stratosphere? |
| A. | Chemiluminescence |
| B. | CO laser method |
| C. | Laser opto-acoustic spectroscopy |
| D. | Colorimetry |
| Answer» D. Colorimetry | |
| 3. |
Which of the following detectors are generally used for detection in NO analysis using CO laser? |
| A. | Photomultiplier tube |
| B. | Photovoltaic cell |
| C. | Liquid nitrogen cooled Ge-Au element |
| D. | Photo emissive tube |
| Answer» D. Photo emissive tube | |
| 4. |
The block diagram for parallel mode analyser of NO and NO2 is given below. Identify the unmarked block in the diagram. |
| A. | NO Analyser |
| B. | NO2 to NO reduction |
| C. | NO2 remover |
| D. | Difference |
| Answer» E. | |
| 5. |
The block diagram of series mode analyser of NO and NO2 is given below. Identify the unmarked procedure. |
| A. | Oxidiser |
| B. | Reducer |
| C. | Filter |
| D. | NO Analyser |
| Answer» B. Reducer | |
| 6. |
During analysis of NO2 using Chemiluminescent analyser, why is NO2 not made to react with ozone directly? |
| A. | Less accuracy |
| B. | It is a slow process |
| C. | It leads to contamination of the sample |
| D. | It does not produce luminescence |
| Answer» C. It leads to contamination of the sample | |
| 7. |
How is NO converted to NO2 for analysis in Chemiluminescent analyser? |
| A. | Treating sample gas with pressurized oxygen |
| B. | Treating sample gas with ozone |
| C. | Treating sample gas with oxygen at low pressure |
| D. | Treating sample gas with water at high pressure |
| Answer» C. Treating sample gas with oxygen at low pressure | |
| 8. |
How is NO converted to NO2 for analysis in UV and Visible analyzers? |
| A. | Treating sample gas with pressurized oxygen |
| B. | Treating sample gas with ozone |
| C. | Treating sample gas with oxygen at low pressure |
| D. | Treating sample gas with water at high pressure |
| Answer» B. Treating sample gas with ozone | |
| 9. |
WHICH_OF_THE_FOLLOWING_DETECTORS_ARE_GENERALLY_USED_FOR_DETECTION_IN_NO_ANALYSIS_USING_CO_LASER??$ |
| A. | Photomultiplier tube |
| B. | Photovoltaic cell |
| C. | Liquid nitrogen cooled Ge-Au element |
| D. | Photo emissive tube |
| Answer» D. Photo emissive tube | |
| 10. |
A pink coloured dye complex is formed when air containing NO2 is passed in an absorbing solution consisting of __________ and diamine dissolved in acetic acid medium.$ |
| A. | Sulphuric acid |
| B. | Sulphonyl |
| C. | Sulphonic acid |
| D. | Sulphanilic acid |
| Answer» E. | |
| 11. |
Which of the following analyzers are used to measure trace amounts of nitrogen oxides in the stratosphere?$ |
| A. | Chemiluminescence |
| B. | CO laser method |
| C. | Laser opto-acoustic spectroscopy |
| D. | Colorimetry |
| Answer» D. Colorimetry | |
| 12. |
To monitor oxides of nitrogen in stack effulents, the sample containing oxides of nitrogen is passed through a flask containing solution of H2O2 in sulphuric acid. Nitric acid is formed. The nitrate ions then react with phenol-disulphonic acid to produce blue colour. |
| A. | True |
| B. | False |
| Answer» C. | |
| 13. |
In Laser Opto-acoustic spectroscopy, the IR beam excites the molecules to higher states. In which of the following ways do the molecules return to the ground state? |
| A. | Collisional de-excitation |
| B. | Random de-excitation |
| C. | By spontaneous emission |
| D. | By stimulated emission |
| Answer» B. Random de-excitation | |
| 14. |
How can absorption be enhanced while determining NO concentration using CO laser? |
| A. | By converting NO into NO<sub>2</sub> |
| B. | By placing NO in a magnetic field |
| C. | By using proper monochromators |
| D. | By using choppers |
| Answer» C. By using proper monochromators | |
| 15. |
The instruments based on chemiluminescence maintain linearity in which of the following ranges? |
| A. | 1ppb to 100ppb |
| B. | 100ppb to 1000ppb |
| C. | 1ppb to 1000ppb |
| D. | 100ppb to 1000ppb |
| Answer» D. 100ppb to 1000ppb | |
| 16. |
During analysis of NO2 using Chemiluminescent analyser, why is NO2 not made to react with ozone directly? |
| A. | Less accuracy |
| B. | It is a slow process |
| C. | It leads to contamination of the sample |
| D. | It does not produce luminescence |
| Answer» C. It leads to contamination of the sample | |
| 17. |
How is NO converted to NO2 for analysis in Chemiluminescent analyser? |
| A. | Treating sample gas with pressurized oxygen |
| B. | Treating sample gas with ozone |
| C. | Treating sample gas with oxygen at low pressure |
| D. | Treating sample gas with water at high pressure |
| Answer» C. Treating sample gas with oxygen at low pressure | |
| 18. |
How is NO converted to NO2 for analysis in UV and Visible analyzers? |
| A. | Treating sample gas with pressurized oxygen |
| B. | Treating sample gas with ozone |
| C. | Treating sample gas with oxygen at low pressure |
| D. | Treating sample gas with water at high pressure |
| Answer» B. Treating sample gas with ozone | |
| 19. |
Nitrogen oxide cannot be directly analysed using UV and Visible analyzers due to which of the following reasons? |
| A. | Less accuracy |
| B. | Very low range |
| C. | It leads to contamination of the sample |
| D. | It is transparent in UV visible regions |
| Answer» E. | |
| 20. |
Nitrogen dioxide can be detected with a paramagnetic analyser. |
| A. | True |
| B. | False |
| Answer» B. False | |