Principles Of Chemistry Instrumentation

35 Questions | By Fagbetunsin | Last updated: Nov 6, 2013 | Total Attempts: 328

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Principles of chemistry instrumentation

Questions and Answers

1.

In spectrophotometer, the visible light passes through a monochromator with a diffraction grating or prism that disperses the white light into a light spectrum
- A.
  
  True
- B.
  
  False
2.

Reflectance photometers use solid phase chemistry technology
- A.
  
  True
- B.
  
  False
3.

Solid phase chemistry can often use whole blood, such that certain features of the cartridges or strips have feature that filter out the red blood cells, leaving only plasma to mix with the test reagents
- A.
  
  True
- B.
  
  False
4.

In nephelometry, the amount of light scatter measured is proportional to the concentration of the substance being measured
- A.
  
  True
- B.
  
  False
5.

In nephelometry, light scatter occurs when incident light encounters particulate molecules in suspension
- A.
  
  True
- B.
  
  False
6.

Turbidity in a liquid is caused by the presence of fine suspended particles, such that light transmitted through the sample is reduced by scattering of light.
- A.
  
  True
- B.
  
  False
7.

Choose all of the chemistry instrumentation principles discussed in the class
- A.
  
  Photometry
- B.
  
  Spectrophotometry
- C.
  
  Reflectance photometry
- D.
  
  Nephelometry
- E.
  
  Turbidimetry
- F.
  
  Ion selective electrode
- G.
  
  Electrochemical (amperometry)
- H.
  
  Basometry
- I.
  
  Cancometry
8.

Choose all the processes that take place in electrochemical technology
- A.
  
  Patient samples are applied to small disposable biosensor strips
- B.
  
  These biosensors contain reagents for the chemical reaction
- C.
  
  These biosensor strips contain electrodes
- D.
  
  Blood sample interacts with reagents in the biosensor strip to produce electrons
- E.
  
  Electrons generated are detected by the meter and converted into glucose units
- F.
  
  Analyzer produced electrons that move into patient sample
9.

How many electrodes are needed for ion-selective electrode?
- A.
  
  1
- B.
  
  2
- C.
  
  3
- D.
  
  4
10.

Electron potential develops when electrodes are exposed to solutions that have different concentrations of the ion being measure
- A.
  
  True
- B.
  
  False
11.

The potential across a membrane in the electrode is proportional to the difference between the two concentrations
- A.
  
  True
- B.
  
  False
12.

Electrolytes are usually measured using the ion-selective electrode principle
- A.
  
  True
- B.
  
  False
13.

Each ion-selective electrode is responsive to a specific ion
- A.
  
  True
- B.
  
  False
14.

In ion-selective electrode, the voltage (electrical potential) into a number representing the concentration of the ion in the unknown solution
- A.
  
  True
- B.
  
  False
15.

In photometry, the operator selects the filter to isolate light of the correct wavelength of light
- A.
  
  True
- B.
  
  False
16.

In spectrophotometry, white light is dispersed into a light spectrum. a narrow slit isolates a beam of one wavelength which has been selected by the operator according to the analysis being performed
- A.
  
  True
- B.
  
  False
17.

Improved electronic, computer, and chemical technology have made it possible for manufacturers to produce smaller instruments that have the following advantages
- A.
  
  Easy to use
- B.
  
  Produce rapid results (turnaround time)
- C.
  
  Require less operator calibration and standardization
- D.
  
  Use prepackage reagents and test unit
- E.
  
  It floats in air
- F.
  
  It is too small to break
18.

Factors to consider when choosing an instrument for the laboratory
- A.
  
  Quality of results
- B.
  
  Type of test
- C.
  
  Volume of tests
- D.
  
  Availability of personnel to train to operate
- E.
  
  Cost of test
- F.
  
  Ease of operation
- G.
  
  Maintenance cost
- H.
  
  Cuteness of the instrument
- I.
  
  Softness of the instrument
19.

The final cost of an instrument purchased is always lower that an instrument leased
- A.
  
  True
- B.
  
  False
20.

The most important factor in choosing an instrument is the cost
- A.
  
  True
- B.
  
  False
21.

Instruments must be installed and grounded as recommended by the manufacturer
- A.
  
  True
- B.
  
  False
22.

Dangling metal jewelry is highly recommended since contact with electrical parts give lab personnel the strength to keep working
- A.
  
  True
- B.
  
  False
23.

The MSDS and chemical labels are not that important. just wear your lab coat and you will be fine
- A.
  
  True
- B.
  
  False
24.

Even though controls are made from biological materials, standard precautions do not need to be observed
- A.
  
  True
- B.
  
  False
25.

Never disinfect any part of the analyzer, whether it comes in contact with specimens or not
- A.
  
  True
- B.
  
  False

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