NMR Spectroscopy – Section 1

1. What is shielding in NMR?

A. Using a curved piece of metal to block an opponents attack
B. Putting metal around an Rf source
C. When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei
D. Blocking parts of a molecule from Rf radiation

Correct Answer: C. When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei

2. What is used to cool the superconducting coil?

A.  Hydrogen
B. Ice
C. Dry ice
D. Liquid helium

Correct Answer: D. Liquid helium

3. Coupling causes the peaks in 1H NMR spectra to be split into

A. two peaks
B. multiple peaks equal to the number of hydrogens on surrounding atoms
C. multiple peaks equal to the number of surrounding carbon atoms
D. multiple peaks equal to the number of hydrogen on surrounding atoms, plus one

Correct Answer: D. multiple peaks equal to the number of hydrogen on surrounding atoms, plus one

4. When placed in a magnetic field, all the random spins of the nuclei

A. stop
B. reverse direction
C. align with the magnetic field
D. rotate to 90° away from the induced field

Correct Answer: C. align with the magnetic field

5. Better understanding of the nuclei is possible,

A. with the help of wavelength spectrum
B. with the help of frequencies ranges
C. with the help of a mathematical translator called the Fourier transfer algorithm
D. none of the above

Correct Answer: C. with the help of a mathematical translator called the Fourier transfer algorithm

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