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MCQs

Total Questions : 147 | Page 15 of 15 pages
Question 141. What is used to cool the superconducting coil?
  1.    Liquid helium
  2.    Ice
  3.    Hydrogen
  4.    Dry ice
 Discuss Question
Answer: Option A. -> Liquid helium
Question 142. When placed in a magnetic field, all the random spins of the nuclei
  1.    align with the magnetic field
  2.    rotate to 90° away from the induced field
  3.    stop
  4.    reverse direction
 Discuss Question
Answer: Option A. -> align with the magnetic field
Question 143. Coupling causes the peaks in 1H NMR spectra to be split into
  1.    multiple peaks equal to the number of hydrogen on surrounding atoms, plus one
  2.    multiple peaks equal to the number of hydrogens on surrounding atoms
  3.    multiple peaks equal to the number of surrounding carbon atoms
  4.    two peaks
 Discuss Question
Answer: Option A. -> multiple peaks equal to the number of hydrogen on surrounding atoms, plus one
Question 144. What is shielding in NMR?
  1.    Using a curved piece of metal to block an opponents attack
  2.    When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei
  3.    Blocking parts of a molecule from Rf radiation
  4.    Putting metal around an Rf source
 Discuss Question
Answer: Option B. -> When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei
Question 145. Better understanding of the nuclei is possible,
  1.    with the help of frequencies ranges
  2.    with the help of a mathematical translator called the fourier transfer algorithm
  3.    None of these
  4.    with the help of wavelength spectrum
 Discuss Question
Answer: Option B. -> with the help of a mathematical translator called the fourier transfer algorithm
Question 146. Why is it important to use a deuterated solvent?
  1.    So the spectrometer can lock onto the sample to prevent the spectrum from drifting during aquisition
  2.    Expensive solvents work best with NMR
  3.    NMR uses least of this solvent
  4.    They dissolve polymer the fastest
 Discuss Question
Answer: Option A. -> So the spectrometer can lock onto the sample to prevent the spectrum from drifting during aquisition
Question 147. All hydrogen atoms
  1.    resonate at different frequencies depending on their environment.
  2.    have the same resonance frequency
  3.    resonate at about the same frequency as carbon
  4.    are attached to carbon
 Discuss Question
Answer: Option A. -> resonate at different frequencies depending on their environment.

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