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MCQs

Total Questions : 61 | Page 4 of 7 pages
Question 31. Two coils are necessary for Fourier transform NMR spectroscopy.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option B. -> False
Answer: (b).False
Question 32. Which of the following cannot be done due to the multiplex advantage?
  1.    Repetitive signals can be summed
  2.    Repetitive signals can be averaged
  3.    Increases signal to noise ratio
  4.    Decreases signal to noise ratio
 Discuss Question
Answer: Option D. -> Decreases signal to noise ratio
Answer: (d).Decreases signal to noise ratio
Question 33. Which of the following is the disadvantage of multichannel excitation?
  1.    Low sensitivity
  2.    Low resolution
  3.    Small number of frequencies is present
  4.    Uneconomical
 Discuss Question
Answer: Option D. -> Uneconomical
Answer: (d).Uneconomical
Question 34. Which of the following must be done to improve sensitivity?
  1.    Frequency sweep mode must be preferred
  2.    Field sweep mode must be preferred
  3.    Single channel excitation must be preferred
  4.    Multichannel excitation must be preferred
 Discuss Question
Answer: Option D. -> Multichannel excitation must be preferred
Answer: (d).Multichannel excitation must be preferred
Question 35. Which of the following is the disadvantage of conventional mode of spectrometer or continuous-wave NMR spectrometer?
  1.    They are unstable
  2.    Maintenance is difficult
  3.    High operating cost
  4.    Excitation is inefficient
 Discuss Question
Answer: Option D. -> Excitation is inefficient
Answer: (d).Excitation is inefficient
Question 36. NMR spectroscopy is used for determining structure in which of the following materials?
  1.    Radioactive materials
  2.    Insoluble chemical compounds
  3.    Liquids
  4.    Gases
 Discuss Question
Answer: Option C. -> Liquids
Answer: (c).Liquids
Question 37. In NMR spectroscopy, the spinning nuclei in a strong magnetic field must be irradiated by which of the following?
  1.    Perpendicular and stronger field
  2.    Perpendicular and weaker field
  3.    Parallel and stronger field
  4.    Parallel and weaker field
 Discuss Question
Answer: Option B. -> Perpendicular and weaker field
Answer: (b).Perpendicular and weaker field
Question 38. NMR spectroscopy indicates the chemical nature of the __________ and spatial positions of _______
  1.    Electrons, Protons
  2.    Neutrons, electrons
  3.    Nuclei, electrons
  4.    Nuclei, neighbouring nuclei
 Discuss Question
Answer: Option D. -> Nuclei, neighbouring nuclei
Answer: (d).Nuclei, neighbouring nuclei
Question 39. NMR is the study of the absorption of __________ by nuclei in a magnetic field.
  1.    Radioactive radiation
  2.    IR radiation
  3.    Radio frequency radiation
  4.    Microwaves
 Discuss Question
Answer: Option C. -> Radio frequency radiation
Answer: (c).Radio frequency radiation
Question 40. NMR spectrometer provides ____________ and _____________ method of determining structure in soluble chemical compounds.
  1.    Accurate, destructive
  2.    Accurate, non-destructive
  3.    Inaccurate, destructive
  4.    Inaccurate, non-destructive
 Discuss Question
Answer: Option B. -> Accurate, non-destructive
Answer: (b).Accurate, non-destructive

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