1. Which is the detector of choice for nephelometers?
Select one ANS >>>
a. diode array
b. photomultiplier tube
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, c. gas photodiode
d. LED ANS >>> b
2. Which statement regarding turbidimetry is NOT correct?
Select one ANS >>>
a. light scattered by solutes in the solution at 180° from the incident light is
measured by a photon detector
b. the measurement of light is made at right angles to the incident light
c. scattered light is directly proportional to the number of particles in solution
d. measures the amount of incident light blocked by particles ANS >>> b
3. What is the effect on the colligative properties when you increase the
number of particles in the solution?
Select one ANS >>>
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, a. Increases the boiling point, increases the freezing point
b. Increases the boiling point, increases the vapor pressure
c. Decreases the boiling point, increases the freezing point,
d. Decreases the freezing point, decreases the vapor pressure ANS >>> d
- increase boiling point
- decrease freezing point
- decrease vapor pressure
- increase osmotic pressure
4. What is the definition of retention factor (Rf) in thin layer chromatography?
Select one ANS >>>
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, a. Ratio of distance moved by the unknown solute to distance moved by the
solvent in the mobile phase
b. Rate of movement of the mobile phase through adsorbant compared with
standards and controls
c. Measurement in centimeters of the distance the solute moved in the mobile
phase from the point of application
d. Distance moved by the mobile phase front from the point of application
compared with a control ANS >>> a
5. What is quenching?
Select one ANS >>>
a. a type of resonant fluorescence
b. an analytical procedure for determining fluorescent compounds.
c. the loss of fluorescent intensity which produces falsely decreased patient
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Select one ANS >>>
a. diode array
b. photomultiplier tube
mailto:https://www.stuvia.com/en-us/user/techgrades
, c. gas photodiode
d. LED ANS >>> b
2. Which statement regarding turbidimetry is NOT correct?
Select one ANS >>>
a. light scattered by solutes in the solution at 180° from the incident light is
measured by a photon detector
b. the measurement of light is made at right angles to the incident light
c. scattered light is directly proportional to the number of particles in solution
d. measures the amount of incident light blocked by particles ANS >>> b
3. What is the effect on the colligative properties when you increase the
number of particles in the solution?
Select one ANS >>>
mailto:https://www.stuvia.com/en-us/user/techgrades
, a. Increases the boiling point, increases the freezing point
b. Increases the boiling point, increases the vapor pressure
c. Decreases the boiling point, increases the freezing point,
d. Decreases the freezing point, decreases the vapor pressure ANS >>> d
- increase boiling point
- decrease freezing point
- decrease vapor pressure
- increase osmotic pressure
4. What is the definition of retention factor (Rf) in thin layer chromatography?
Select one ANS >>>
mailto:https://www.stuvia.com/en-us/user/techgrades
, a. Ratio of distance moved by the unknown solute to distance moved by the
solvent in the mobile phase
b. Rate of movement of the mobile phase through adsorbant compared with
standards and controls
c. Measurement in centimeters of the distance the solute moved in the mobile
phase from the point of application
d. Distance moved by the mobile phase front from the point of application
compared with a control ANS >>> a
5. What is quenching?
Select one ANS >>>
a. a type of resonant fluorescence
b. an analytical procedure for determining fluorescent compounds.
c. the loss of fluorescent intensity which produces falsely decreased patient
mailto:https://www.stuvia.com/en-us/user/techgrades
