UV-Visible Spectroscopy Solved Questions and Answers | UV-Visible Spectroscopy MCQs

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Questions
1 Molar extinction coefficient has units of
A lit.mol-1.cm-1
B dl.g -1cm -1
C No units
D lit.g -1cm -1

Answer:lit.mol-1.cm-1
2 Which of the following statement is not correct ?
A Absorptivity changes with the intensity of the light
B Absorbance is independent of intensity of the light
C Absorbance has no units
D Absorptivity is a constant and depends on the nature of the molecule

Answer:Absorptivity changes with the intensity of the light
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3 The above listed compounds are transparent in
A Vacuum UV region
B UV-visible region
C Visible only
D UV only

Answer:UV-visible region
4 Which of the following is a non-dispersive wavelength selector
A Gratings
B Prisms
C filters
D All the above

Answer:filters
5 All of the following are useful as a source for UV-Visible, EXCEPT
A Globar source
B Xenon discharge lamp
C Deuterium discharge lamp
D Tungsten filament lamp

Answer:Globar source
6 Which of the following material is used to coat the cathode in photo tube
A Copper
B Sodium
C Bromium
D Cesium

Answer:Cesium
7 Iodine is filled in the tungsten filament lamps to
A Increase the emission wavelength spectra
B Re-deposit the sublimed tungsten
C Decrease the decomposition of the tungsten
D All of the above

Answer:Re-deposit the sublimed tungsten
8 Collimator is a device used in monochromators to
A Focus the required range of wavelength of radiation
B Eliminate interferences from other amines
C Eliminate reflection and scattering
D Focus the incident radiation parallel on to the dispersing device

Answer:Focus the incident radiation parallel on to the dispersing device
9 Which of the following leads to chemical deviation from Beer’s law
A Change in refractive index
B Change in pH of the solution
C Polychromatic radiation
D Both a and b

Answer:Change in pH of the solution
10 All of the following expressions are correct, except
A T=I t/I 0
B A=-logT
C A=2 - log%T
D A=-log(I0 /It)

Answer:A=-log(I0 /It)

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