Absorption Instrumentation and Block Diagram Representation Flashcards
- Which of the following detectors does not require a
battery and is also known as barrier layer cell?
a) Photomultiplier tube
b) Photovoltaic cell
c) Photoemissive tubes
d) Photo reflector
b) Photovoltaic cell
- Which of the following detectors is used to detect light
intensities which are very weak?
a) Photomultiplier tube
b) Photovoltaic cell
c) Photoemissive tubes
d) Photo reflector
a) Photomultiplier tube
- How is Tungsten Halogen lamp differs from normal
Tungsten filament lamp used in absorption spectroscopy?
a) It has a tungsten filament and is filled with inert gas
b) Iodine is added to normal filling gas
c) Iodine is coated on tungsten filament
d) Iodine is added to inert gas
b) Iodine is added to normal filling gas
- Instead of glass filters, why gelatin filters could not be
used for a long period while both are Absorption filters?
a) Gelatin tends to evaporate and hence they deteriorate
b) Gelatin is affected by humidity in the environment
c) They deteriorate due to absorption of heat leading to
changes in gelatin
d) Gelation is affected by temperature in the environment
c) They deteriorate due to absorption of heat leading to
changes in gelatin
- How does continuous wedge filter differ from normal
interference filter used in absorption spectroscopy?
a) It permits continuous selection of different wavelength
b) It allows a narrow band of wavelengths to pass
c) It has two semi-transparent layers of silver
a) It permits continuous selection of different wavelength
- Which of the following could be used as the layer of
dielectric in interference filters used in Absorption
Spectroscopy?
a) Graphite
b) MgF2
c) Fe
d) AgNO3
b) MgF2
- How can stability of radiation be achieved in
incandescent or discharge source used in Absorption
Spectroscopy?
a) Using filters
b) Using monochromators
c) Using slits
d) By controlling the source voltage
d) By controlling the source voltage
- To tolerate high operating temperatures, which of the
following has to be done in incandescent or tungsten
filament lamps?
a) Alloys must be used
b) Nitrogen be used instead of inert gas
c) Envelope is fabricated with quartz
d) Envelope is fabricated with copper
c) Envelope is fabricated with quartz
- Which of the following is not a reason for laser not
being generally used as a source of radiation for UV,
Visible Spectroscopy?
a) High cost
b) Limited range of wavelength
c) Less intensity
d) Complex to work with
c) Less intensity
- Which of the following statements is false about single
beam absorption instruments?
a) Tungsten bulb is used as a source
b) Beam splitter is used to get parallel beam
c) Test tube is used as sample holder
d) Photovoltaic cell as detector
b) Beam splitter is used to get parallel beam
- Which of the following statement is false about double
beam absorption instruments?
a) It is similar to single beam instruments except two
beams are present
b) Tungsten bulb is used as a source
c) Reference beam must have a higher intensity than
sample beam
d) Both the beams after they pass through respective
samples are compared
c) Reference beam must have a higher intensity than
sample beam
- Which of the following is not an application of
colorimeter?
a) Paints
b) Inks
c) Cosmetics
d) Composition detection
d) Composition detection
- In photometers, the readings of the specimen are
initially obtained in the form of which of the following
parameters?
a) Transmittance
b) Absorption
c) Wavelengths
d) Volume
a) Transmittance
- Colorimeters are used in applications where great
accuracy is required.
a) True
b) False
b) False
- Which of the following is the purpose of balance
indicator in double beam photometer or colorimeter?
a) Selects a particular wavelength
b) Splits the wavelength selected into two equal beams
c) Detects and indicates the amount of light falling on it
d) Indicates the difference between the output of two
photometers
d) Indicates the difference between the output of two
photometers
- Colorimeters are used to determine the concentration
of solutions.
a) True
b) False
a) True
- Which of the following is the purpose of the beam
splitter in double beam photometer or colorimeter?
a) Splits beam into two equal intensity beams
b) Splits beam in such a way that sample beam has higher
intensity
c) Splits beam in such a way that a reference beam has
higher intensity
d) Merge two equal intensity beams into single beam
a) Splits beam into two equal intensity beams
- Which of the following is a source used in
spectroscopy?
a) LASER
b) Tube light
c) Sodium vapour lamp
d) Tungsten lamp
d) Tungsten lamp
- Which of the following is the wave number of near
infrared spectrometer?
a) 4000 – 200 cm^-1
b) 200 – 10 cm^-1
c) 12500 – 4000 cm^-1
d) 50 – 1000 cm^-1
c) 12500 – 4000 cm^-1
- Which of the following is not a source used in Mid
Infrared Spectrophotometer?
a) Nernst glower
b) High pressure mercury arc lamp
c) Globar
d) Nichrome wire
b) High pressure mercury arc lamp
- Which of the following options are correct in terms of
wavelength for the different types of IR spectrometer?
a) Near IR: 0.8 – 2.5 mm
b) Mid IR: 0.8 – 2.5 mm
c) Far IR: 2.5 – 50 mm
d) Mid IR: 50 – 100 mm
a) Near IR: 0.8 – 2.5 mm
- What is the composition of Globar rod which is used as
a source in Mid IR spectroscopy?
a) Silicon carbide
b) Silver chloride
c) Silicon dioxide
d) Silver carbide
a) Silicon carbide
- Which of the following is not a composition of Nernst
glower or Nernst filament?
a) Oxides of Zirconium
b) Oxides of Barium
c) Oxides of Yitrium
d) Oxides of Thorium
b) Oxides of Barium
- Bolometer, a type of detector, is also known as
___________
a) Resistance temperature detector (RTD)
b) Thermistor
c) Thermocouple
d) Golay cell
b) Thermistor
- Which of the following is not used as pyroelectric
material used in pyroelectric transducers in Infrared
spectroscopy?
a) Triglycine Sulphate
b) Deutrated Triglycine Sulphate
c) Some Polymers
d) Tetraglycine sulphate
d) Tetraglycine sulphate
- Which of the following is not a technique for preparing
solid samples in IR spectroscopy?
a) Solids run in solution
b) Mull technique
c) Solid films
d) Thin films
d) Thin films