Sail E0 Webinar

MCQs

Total Questions : 61 | Page 3 of 7 pages
Question 21. Which of the following techniques do not enhance sensitivity by a factor of 10 at normal operating conditions?
  1.    Optimization of sample volume
  2.    Optimization of instrumental parameters
  3.    Optimization of noise
  4.    Time averaging
 Discuss Question
Answer: Option D. -> Time averaging
Answer: (d).Time averaging
Question 22. Better sensitivity with good resolution can be achieved by concentrating the sample inside which of the following?
  1.    Sample cell
  2.    Micro cell
  3.    Sample tube
  4.    Cylindrical tube
 Discuss Question
Answer: Option B. -> Micro cell
Answer: (b).Micro cell
Question 23. The most common spherical cells have which of the following dimensions?
  1.    4mm diameter
  2.    40mm diameter
  3.    8mm diameter
  4.    80mm diameter
 Discuss Question
Answer: Option A. -> 4mm diameter
Answer: (a).4mm diameter
Question 24. Frequency spectrum of noise occupies a band that is _________ the signal spectrum. Choose the most appropriate option.
  1.    Narrow than
  2.    Wider than
  3.    Different from
  4.    Same as
 Discuss Question
Answer: Option B. -> Wider than
Answer: (b).Wider than
Question 25. Suppression of frequencies which contain no signal does which of the following?
  1.    Increases S/N ratio
  2.    Decreases S/N ratio
  3.    S/N ratio is kept constant
  4.    S/N ratio becomes 1
 Discuss Question
Answer: Option A. -> Increases S/N ratio
Answer: (a).Increases S/N ratio
Question 26. The amplification required for continuous-wave NMR is of the order of which of the following?
  1.    10¹
  2.    10²
  3.    10³
  4.    10⁵
 Discuss Question
Answer: Option D. -> 10⁵
Answer: (d).10⁵
Question 27. Which of the following can be used instead of magnets to produce the magnetic field?
  1.    Inductor
  2.    Motor
  3.    Generator
  4.    Superconducting solenoids
 Discuss Question
Answer: Option D. -> Superconducting solenoids
Answer: (d).Superconducting solenoids
Question 28. Fourier transform NMR spectrometer has which of the following characteristics?
  1.    Increased sensitivity, long time to obtain data
  2.    Decreased sensitivity, long time to obtain data
  3.    Increased sensitivity, reduced time to obtain data
  4.    Decreased sensitivity, reduced time to obtain data
 Discuss Question
Answer: Option C. -> Increased sensitivity, reduced time to obtain data
Answer: (c).Increased sensitivity, reduced time to obtain data
Question 29. Fourier transform NMR spectrometer allows NMR transitions to be observed simultaneously.
  1.    True
  2.    False
  3.    May be True or False
  4.    Can't say
 Discuss Question
Answer: Option A. -> True
Answer: (a).True
Question 30. How is the inhomogeneity of magnetic fields compensated?
  1.    With large magnetic fields
  2.    With small magnetic fields
  3.    By using two or more magnets
  4.    By providing required insulation
 Discuss Question
Answer: Option B. -> With small magnetic fields
Answer: (b).With small magnetic fields

Latest Videos

Latest Test Papers