NMR -ELECTIVES -BPHARM

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 is the study of the absorption of __________ by nuclei in a magnetic field.

• a) Radioactive radiation

• b) IR radiation

• c) Radio frequency radiation

• d) Microwaves

4. NMR spectroscopy indicates the chemical nature of the __________ and spatial

positions of _______

• a) Electrons, Protons

• b) Neutrons, electrons

• c) Nuclei, electrons

• d) Nuclei, neighbouring nuclei

10. 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

The difference between the field necessary for resonance in the sample and in some

arbitrary a chosen compound is which of the following?

• a) Field shift

• b) Matrix effects

• c) Chemical shift

• d) Resonance shift

Which of the following are considered to be the lowest form of Electromagnetic radiation?

• a) IR radiation

• b) Micro waves

• c) UV radiation

• d) Radio waves

•The first observations of Nuclear magnetic resonance NMR signals were observed independently by Purcell and Bloch in THE YEAR

The spin value of 19F is

The frequency of precession is given by  w0 = g B0, g represents.,

1.A sample is placed in a magnetic field and irradiated with radio

wave radiation at around 300-----------for a 7---------field.