Questions and answers for exam Preparation

MCQs

Total Questions : 147 | Page 8 of 15 pages

Question 71. An FT-IR instrument record a signal in the

time domain
frequency domain
both (a) and (b)
none of these

Discuss Question

Answer: Option A. -> time domain
Answer: (a).time domain

Question 72. The sequence of amino acids in proteins can be determined by means of

identification of the -NH₂ terminal amino acids
identification of the -COOH terminal amino acids
partial cleavage of the original polypeptide into smaller polypeptides
all of the above

Discuss Question

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

Question 73. Which of the following is the basis of first dimension of separation for two-dimensional electrophoresis?

Molecular mass
Solubility
Isoelectric point
Folding

Discuss Question

Answer: Option C. -> Isoelectric point
Answer: (c).Isoelectric point

Question 74. What is meant by rotating frame of reference?

That the sample is spun rapidly in the applied field
If the laboratory itself is imagined to be rotated at the Larmor frequency, viewing that individual magnetic moment vectors are fixed in space
That the detector rotates around the sample
None of the above

Discuss Question

Answer: Option B. -> If the laboratory itself is imagined to be rotated at the Larmor frequency, viewing that individual magnetic moment vectors are fixed in space
Answer: (b).If the laboratory itself is imagined to be rotated at the Larmor frequency, viewing that individual magnetic moment vectors are fixed in space

Question 75. When radiation energy is absorbed by a spin 1/2 nucleus in a magnetic field, what happens?

The processional frequency of the nucleus increases
The nucleus spins faster
The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field
none of the above

Discuss Question

Answer: Option C. -> The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field
Answer: (c).The angle of precession flips so that the magnetic moment of the nucleus opposes the applied field

Question 76. Which of the following detectors give mass flow-dependent signals?

Electron capture detector
Field ionisation detector
Thermal conductivity detector
All of the above

Discuss Question

Answer: Option B. -> Field ionisation detector
Answer: (b).Field ionisation detector

Question 77. Split injection is carried out by

splitting the sample into smaller portions to inject sequentially
splitting the sample into smaller portions to inject at the same time through parallel ports
splitting off some of the sample so that it does not enter the column
none of the above

Discuss Question

Answer: Option C. -> splitting off some of the sample so that it does not enter the column
Answer: (c).splitting off some of the sample so that it does not enter the column

Question 78. Headspace analysis is carried out in order to

analyse volatile compounds from solid or liquid samples
determine the psychological state of the tutor
analyse the column contents ahead of the sample
determine non-volatiles

Discuss Question

Answer: Option A. -> analyse volatile compounds from solid or liquid samples
Answer: (a).analyse volatile compounds from solid or liquid samples

Question 79. What does the retention factor, k', describe?

The distribution of an analyte between the stationary and the mobile phase
The migration rate of an analyte through a column
The velocity of the mobile phase
All of these

Discuss Question

Answer: Option B. -> The migration rate of an analyte through a column
Answer: (b).The migration rate of an analyte through a column

Question 80. In the past, IR spectra had to be aquired one wavelength at a time, which took a long time. Today quick spectra is due to the

the Fourier Transfer Algorithm allows us to scan all frequencies at once
light is faster today that it used to be
absence of broad spectrum of wavelenth
none of the above

Discuss Question

Answer: Option A. -> the Fourier Transfer Algorithm allows us to scan all frequencies at once
Answer: (a).the Fourier Transfer Algorithm allows us to scan all frequencies at once