Questions and answers for exam Preparation

MCQs

Total Questions : 147 | Page 2 of 15 pages

Question 11. The frequency of precession, the transition frequency and the Larmor frequency are

different terms for the same frequency
same terms for the same frequency
different terms for the different frequency
same terms for the different frequency

Discuss Question

Answer: Option A. -> different terms for the same frequency
Answer: (a).different terms for the same frequency

Question 12. In scanning electron microscopy

a specimen is fixed and then coated with thin layer of a heavy metal
a specimen is fixed and then coated with transition metal
a specimen is not fixed and then coated with thin layer of a heavy metal
none of the above

Discuss Question

Answer: Option A. -> a specimen is fixed and then coated with thin layer of a heavy metal
Answer: (a).a specimen is fixed and then coated with thin layer of a heavy metal

Question 13. How do you turn a signal recorded in the time domain into a frequency domain signal?

Fourier transformation
Measurement of peak areas
By use of a Michelson interferometer
None of the above

Discuss Question

Answer: Option A. -> Fourier transformation
Answer: (a).Fourier transformation

Question 14. In immunofluroscence microscopy, fluroscent compounds are attached to

an antibody specific for the subcellular structure
an antigen specific for the subcellular structure
bound antibody specific for the subcellular structure
none of these

Discuss Question

Answer: Option A. -> an antibody specific for the subcellular structure
Answer: (a).an antibody specific for the subcellular structure

Question 15. How many possible orientations do spin 1/2 nuclei have when they are located in an applied magnetic field?

Discuss Question

Answer: Option A. -> 2
Answer: (a).2

Question 16. What does the selectivity factor describe?

The proportional difference in widths of two chromatographic peaks
The maximum number of different species which a column can separate simultaneously
The relative separation achieved between two species
None of the above

Discuss Question

Answer: Option C. -> The relative separation achieved between two species
Answer: (c).The relative separation achieved between two species

Question 17. The column is heated to

prevent analyte condensation within the column
control elution of the different analytes
reduce band broadening to get sharper peaks
all of these

Discuss Question

Answer: Option D. -> all of these
Answer: (d).all of these

Question 18. What are the benefits of decreasing the column internal diameter?

Increased sample capacity
Increased resolution
Reduced risk of column overloading
All of the above

Discuss Question

Answer: Option B. -> Increased resolution
Answer: (b).Increased resolution

Question 19. A retention gap is placed between the injector and the front of the column to

retain contaminants and prevent them from reaching the column
retain the sample and release it gradually to the column
prevent backflush of the injected solution
all of the above

Discuss Question

Answer: Option A. -> retain contaminants and prevent them from reaching the column
Answer: (a).retain contaminants and prevent them from reaching the column

Question 20. Helium is generally preferred as carrier gas over nitrogen and hydrogen because