Download PDF
Free download in PDF UV-Visible Spectroscopy Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>
(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
(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
(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
(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
(6)
Which of the following material is used to coat the cathode in photo tube
[A]
Copper
[B]
Sodium
[C]
Bromium
[D]
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)
Take Mock Tests