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Free download in PDF NMR Spectroscopy Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(1)
NMR spectroscopy is used for determining structure in which of the following materials?
[A]
Radioactive materials
[B]
Insoluble chemical compounds
[C]
Liquids
[D]
Gases
(2)
NMR spectrometer provides ____________ and _____________ method of determining structure in soluble chemical compounds.
[A]
Accurate, destructive
[B]
Accurate, non-destructive
[C]
Inaccurate, destructive
[D]
Inaccurate, non-destructive
Answer: Accurate, non-destructive
(3)
In NMR spectroscopy, the spinning nuclei in strong magnetic field must be irradiated by which of the following?
[A]
Perpendicular and stronger field
[B]
Perpendicular and weaker field
[C]
Parallel and stronger field
[D]
Parallel and weaker field
Answer: Perpendicular and weaker field
(4)
Interaction between matter and electromagnetic radiation can be observed by subjecting a substance to magnetic fields in which of the following manner?
[A]
Both fields should be stationary
[B]
Both fields should be varying
[C]
One field should be stationary and the other should be varying
[D]
It must be subjected to only one field
Answer: One field should be stationary and the other should be varying
(5)
The amount of energy available in radio frequency radiation is sufficient for which of the following?
[A]
Excite an atom
[B]
Vibrate an atom
[C]
Vibrate a molecule
[D]
Affect the nuclear spin of an atom
Answer: Affect the nuclear spin of an atom
(6)
If the number of protons or neutrons is even the spin of the nucleus will be which of the following?
[A]
Integral spin
[B]
Half integral spin
[C]
Zero spin
[D]
Positive spin
(7)
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: resonate at different frequencies depending on their environment
(8)
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: with the help of a mathematical translator called the fourier transfer algorithm
(9)
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: multiple peaks equal to the number of hydrogen on surrounding atoms, plus one
(10)
What is used to cool the superconducting coil?
[A]
Hydrogen
[B]
Ice
[C]
Dry ice
[D]
Liquid helium
(11)
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: When the magnetic moment of an atom blocks the full induced magnetic field from surrounding nuclei
(12)
The difference between the field necessary for resonance in the sample and in some arbitrary chosen compound is which of the following?
[A]
Field shift
[B]
Matrix effects
[C]
Chemical shift
[D]
Resonance shift
(13)
If the number of protons or neutrons is even the spin of the nucleus will be which of the following?
[A]
Integral spin
[B]
Half integral spin
[C]
Zero spin
[D]
Positive spin
(14)
Nuclei having either the number of protons or neutrons as odd have _______ spin.
[A]
Integral spin
[B]
Half integral spin
[C]
Zero spin
[D]
Positive spin
Answer: Half integral spin
(15)
In NMR spectroscopy, the spinning nuclei in strong magnetic field must be irradiated by which of the following?
[A]
Perpendicular and stronger field
[B]
Perpendicular and weaker field
[C]
Parallel and stronger field
[D]
Parallel and weaker field
Answer: Perpendicular and weaker field
(16)
NMR spectrometer provides ____________ and _____________ method of determining structure in soluble chemical compounds.
[A]
Accurate, destructive
[B]
Accurate, non-destructive
[C]
Inaccurate, destructive
[D]
None of the above
Answer: Accurate, non-destructive
(17)
NMR is the study of absorption of __________ by nuclei in a magnetic field?
[A]
Radioactive radiation
[B]
IR radiation
[C]
Radio frequency radiation
[D]
Microwaves
Answer: Radio frequency radiation
(18)
NMR spectroscopy is used for determining structure in which of the following materials?
[A]
Radioactive materials
[B]
Insoluble chemical compounds
[C]
Liquids
[D]
Gases
(19)
The distance between the centers of the peaks of doublet is called as?
[A]
Coupling constant
[B]
Spin constant
[C]
Spin-spin coupling
[D]
Chemical shift
Answer: Coupling constant
(20)
NMR is the study of absorption of __________ by nuclei in a magnetic field?
[A]
Radioactive radiation
[B]
IR radiation
[C]
Radio frequency radiation
[D]
Microwaves
Answer: Radio frequency radiation
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