1. Decrease in fluorescence intensity duc to specific effect of constituents of the solution itself, it is called: A. Fluorescence C. Quenching B. Phosphorus D Hydration I 2. Which molecule is produced Quenching? A. Phosphorous C. Sodium B . Hydrogen D. Mercury 3. Which is principal of the IR spectroscopy? A. Absorption C. Adsorption B . Emissions D. All of the above 4. Which type of vibration bond angle is decrease? A. A symmetrical C. Rocking B. Asymmetrical D. Scissoring 5. Which IR frequency are absorbed by compound ? A. Applied frequency of the IR is equal to the natural frequency of the compound B. Applied frequency of the IR is low to the natural frequency of the compound C. Applied frequency of the IR is greater to the natural frequency of the compound D. None of the all 6. Which detector is used mostly in Fluorimetry? C. Photo tube A. Photo voltaic cell B. Photomultiplier tube D. All of the above 7. The main advantage of fluorescence over UV-Vis spectroscopy is; C. Its compatibility with most analytes A. Its sensitivity B. Its compatibility with separation techniques D. None of the above square 8. Select the true statement about fluorescence spectroscopy of molccules in the UV -visible region A. Emission usually occurs at energies that are greater than the energies of excitation B. Emission usually occurs at energies that are less than the energies of excitation C. Emission usually occurs at energies that are equal to the energies of excitation. D. None of the above is accurate square 9. Which of the following molecule does not show fluorescence; A. Qunine sulphate C. Ethidium bromide B . Chlorophyll D. Nucleic acids 10. Non-dispersive IR spectrophotometer will not have C. Cell A. Source B. Monochromator D. Detector