# Q1: 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

ANS:C - When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei

# Q2: What is used to cool the superconducting coil?

A Hydrogen
B Ice
C Dry ice
D Liquid helium

ANS:D - Liquid helium

# Q3: 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

ANS:C - align with the magnetic field

# Q4: 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

ANS:C - with the help of a mathematical translator called the fourier transfer algorithm

# Q5: Why is it important to use a deuterated solvent?

A NMR uses least of this solvent
B So the spectrometer can lock onto the sample to prevent the spectrum from drifting during aquisition
C Expensive solvents work best with NMR
D They dissolve polymer the fastest

ANS:B - So the spectrometer can lock onto the sample to prevent the spectrum from drifting during aquisition

# Q6: 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

ANS:B - resonate at different frequencies depending on their environment.

# Q7: 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

ANS:D - multiple peaks equal to the number of hydrogen on surrounding atoms, plus one