MCQs BIOCHEMISTRY: NMR Spectroscopy

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
Answer & Explanation
Answer: Option C

2.
What is used to cool the superconducting coil?

A. Hydrogen
B. Ice
C. Dry ice
D. Liquid helium
Answer & Explanation
Answer: Option D

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
Answer & Explanation
Answer: Option D

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
Answer & Explanation
Answer: Option C

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
Answer & Explanation
Answer: Option C

6.
All hydrogen atoms

A. have the same resonance frequency
B. resonate at different frequencies depending on their environment.
C. are attached to carbon
D. resonate at about the same frequency as carbon
Answer & Explanation
Answer: Option B