UV-Visible Spectroscopy Objective Questions and Answers

Questions

1 Which of the following spectroscopy techniques is associated with molecular emission?

A UV-Visible spectroscopy

B IR spectroscopy

C Fluorescence spectroscopy

D X-ray diffraction

View Answer

Answer:Fluorescence spectroscopy

2 The primary band in aromatic compounds are observed at

A 241

B 215

C 255

D 184

View Answer

Answer:184

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3 Select the groups that produces bathochromic shift when substituted on benzene.

uv-visible-spectroscopy

A Q,R

B P,S

C P only

D P,Q,R and S

View Answer

Answer:P,Q,R and S

4 Diffraction gratings work on the basis of

A Max-Well Boltzman’s equation

B Bragg’s equation

C Noise-whitney equation

D Beer’s law

View Answer

Answer:Bragg’s equation

5 Select INCORRECT statement related to the following data.

E_{e_{=Energy required for electronic transition}}

E_v=Energy required for Vibrational transition

E_r=Energy required for rotational transition

A E _e > E _v > E _r

B E _e=100 * E _v

C E _e=10000 * E _r

D E _r=100* E _v

View Answer

Answer:E _e=100 * E _v

6 Dark current in photo multiplier tube is

A The current produced by falling light on cathode

B The current produced by falling light on anode

C The residual current due to spontaneous discharge of dynodes

D The residual current that appears after the removal of incident light

View Answer

Answer:The residual current due to spontaneous discharge of dynodes

7 The mid IR region is

A 400-800 nm

B 25 μm-2.5 μm

C 4000-400 cm^-1

D 2.5 μm – 1mm

View Answer

Answer:4000-400 cm^-1

8 Choose the wave number corresponding to 25 μm

A 2500 cm ^-1

B 4000 cm^-1

C 250 cm ^-1

D 400 cm ^-1

View Answer

Answer:400 cm ^-1

9 During relaxation, the electron spin is reversed in

A Fluorescence

B Phosphorescence

C IR

D NMR

View Answer

Answer:Phosphorescence

10 Which of the following is a real limitation to Beer’s law

A Fluorescence

B Analyte Dissociation

C Polychromatic radiation is used as source

D Analyte at high concentrations

View Answer

Answer:Analyte at high concentrations

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