Which of the following is not the advantage of Fourier Transform Spectrometers?
A. Signal to noise ratio is high
B. Information could be obtained on all frequencies
C. Retrieval of data is possible
D. Easy to maintain
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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
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In Michelson's interferometer, the . . . . . . . . of the detector output will depend upon the intensity of incoming radiation.
A. Velocity
B. Frequency
C. Amplitude
D. Phase
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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
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Which of the following is false about the wavelengths of electromagnetic radiation?
A. Radiation with short wavelengths have high energies
B. Energy does not depend on wavelength
C. Radiation with long wavelengths have low energies
D. Energy depends on wavelength
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In Michelson Interferometer, if the reflected and transmitted beams are in phase at the beam splitter, then maximum intensity will reach the detector.
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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
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Only pyroelectric transducer or pyroelectric crystals are used as detectors in Fourier Transform Infrared Spectrophotometer (FTIR). What is the main reason for other types of thermal detectors are not being used in FTIR spectrophotometer?
A. Less accuracy
B. Slower response
C. Less precision
D. Less sensitivity
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What is the unit of molar absorptivity or absorptivity which is used to determine absorbance A in Beer Lambert's formula?
A. L mol-1 cm-1
B. L gm-1 cm-1
C. Cm
D. No unit
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In Michelson's interferometer, the frequency of the detector output can be determined by translating the . . . . . . . . of movable mirror and the . . . . . . . . of monochromatic radiation.
A. Velocity, Wavelength
B. Thickness, Intensity
C. Length, Velocity
D. Angle, Intensity
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The function of pressure regulators in the emission system of flame photometer is to have a steady flame which is free from flickers.
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Colorimeters are used in applications where great accuracy is required.
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Which of the following is not an application of Flame emission photometers?
A. Analysis of biological fluids
B. Determination of sodium, potassium in soil
C. Determination of metals such as Mn, Cu
D. Analysis of complex mixtures
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Enzyme-linked immunosorbent assay (ELISA) is used for
A. Quantifying antibody levels in blood
B. Determining the molecular weight of an antigen
C. Purifying proteins from biological fluids
D. Determining the molecular weight of an antibody
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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
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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
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Which of the following is not true about Absorption spectroscopy?
A. It involves transmission
B. Scattering is kept minimum
C. Reflection is kept maximum
D. Intensity of radiation leaving the substance is an indication of a concentration
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In transmission electron microscopy, electron opacity is greatly enhanced by treating the specimen with
A. Ferrous ammonium sulfate
B. Uranium acetate
C. Sodium chloride
D. Basic fuchsin
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Which of the following is the principle of Golay cell which is used as a detector in IR spectroscopy?
A. Expansion of gas upon heating
B. Increase in resistance due to an increase in temperature and vice versa
C. Temperature difference gives rise to a potential difference in the material
D. Decrease in resistance due to an increase in temperature
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Group I lists spectroscopic methods and
Group II lists bimolecular applications of these methods. Match the methods in
Group I with the applications in
Group II .
Group I
Group II
P. Infrared
1. Identification of functional groups
Q. Circular Dichroism
2. Determination of secondary structure
R. Nuclear Magnetic Resonance
3. Estimation of molecular weight
4. Determination of 3-D structure
A. P-4, Q-3, R-1
B. P-2, Q-1, R-3
C. P-1, Q-2, R-4
D. P-3, Q-2, R-4
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