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

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

Answer:Fluorescence spectroscopy
2 The primary band in aromatic compounds are observed at
A 241
B 215
C 255
D 184

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

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

Answer:Bragg’s equation
5 Select INCORRECT statement related to the following data.

Ee=Energy required for electronic transition

Ev=Energy required for Vibrational transition

Er=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

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

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

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

Answer:400 cm -1
9 During relaxation, the electron spin is reversed in
A Fluorescence
B Phosphorescence
C IR
D NMR

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

Answer:Analyte at high concentrations

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