Spectroscopy – General Principles | Pharmaceutical Analysis | GPAT Mock Test

1. Which of the following statements correctly describes the wave-particle duality of light?

2. Atomic spectra are characterized as line spectra because:

3. Which region of the electromagnetic spectrum has the highest energy?

4. Beer-Lambert’s law states that absorbance is directly proportional to:

5. The unit of molar absorptivity (ε) is:

6. A shift of λmax to a longer wavelength is known as:

7. In absorption spectroscopy, the amount of light absorbed is measured, while in emission spectroscopy, the amount of light ____ is measured.

8. If the transmittance of a solution is 10%, what is its absorbance?

9. What is the primary reason for the appearance of broad band spectra in molecules as opposed to line spectra in atoms?

10. The effect of pH on the UV spectrum of an acidic drug like Phenobarbital is due to:

11. A spectrophotometer measures the amount of light that a sample:

12. In a neutralization curve obtained by spectrophotometric titration, the equivalence point is determined by:

13. The relationship between energy (E) and wavelength (λ) of electromagnetic radiation is:

14. Which of the following is an example of an emission spectroscopy technique?

15. The wavelength of maximum absorption (λmax) is important because:

16. Increasing the polarity of the solvent for a compound showing n → π* transition typically results in a:

17. Which of the following is NOT a part of the electromagnetic spectrum?

18. An increase in the intensity of an absorption band (molar absorptivity) is called a:

19. If a solution has an absorbance of 2.0, what percentage of light is transmitted through it?

20. In the context of UV-Vis spectroscopy, an auxochrome is a group that:

21. The selection rule for electronic transitions in UV-Vis spectroscopy is primarily based on:

22. Which of the following solvents would be most suitable for UV analysis in the range of 200-400 nm?

23. The energy of a photon is given by the equation E = hν. Here, ‘h’ represents:

24. Deviations from Beer’s Law can be caused by:

25. In the titration of a weak acid with a strong base, if the acid form absorbs light but the conjugate base does not, how will the absorbance change as the titrant is added?