CLT Exam 1 Questions with Complete
Solutions
Which of the following statements is true? - ANSWERSAt minimum two levels of control should
be tested daily for each test run in the laboratory.
When comparing an instrument to its peer group, which statistic provides the most useful
information regrind its ACCURACY - ANSWERSSDI- standard deviation index
When comparing an instrument to its peer group, which statistic provides the most useful
description of OVERALL IMPRECISION - ANSWERSCVR
2(2s) - ANSWERSDetects systematic error
1(3s) - ANSWERSDetects rondom error
If the light source on an instrument is gradually weakening, it could contribute to what type of
error? - ANSWERSSystematic error
If you change reagent on the instrument and your control results demonstrates a sudden and
consistent increase in value, this phenomena is - ANSWERSA shift in performance due to
systematic error
If one of two control values within a single test run is between 2s and 3s on the positive side,
you should - ANSWERSAccept the run if no error can be detected
Dilution - ANSWERSDecrease concentration by adding water/solvent
, Solute - ANSWERSSubstance being dissolved
Solvent - ANSWERSThe substance in which the solute dissolves in
Ratio - ANSWERSComparison of solute to solvent
Example of ratios to dilutions (3/27) - ANSWERSDilution- 1/9
Dilution factor- 9
Serum needed to make dilution- 1
Saline needed to make dilution- 8
Tube dilution - ANSWERSDilution ratio in that tube alone
Solution dilution - ANSWERSActual concentration of the solvent in each tube (dependent on the
previous dilutions)
Final concentration - ANSWERSThe solution dilution of the last tube
%w/w - ANSWERS(Unit weights of solute = grams of solute) / (100 ml of solution = 1dL of
solution)
%w/v - ANSWERS(Grams of solute = grams of solute) / (100 mL of solution = 1 dL of solution)
%v/v - ANSWERS(mL of concentration = mL of concentrate) / 100 mL of solution = 1 dL of
solution)
Solutions
Which of the following statements is true? - ANSWERSAt minimum two levels of control should
be tested daily for each test run in the laboratory.
When comparing an instrument to its peer group, which statistic provides the most useful
information regrind its ACCURACY - ANSWERSSDI- standard deviation index
When comparing an instrument to its peer group, which statistic provides the most useful
description of OVERALL IMPRECISION - ANSWERSCVR
2(2s) - ANSWERSDetects systematic error
1(3s) - ANSWERSDetects rondom error
If the light source on an instrument is gradually weakening, it could contribute to what type of
error? - ANSWERSSystematic error
If you change reagent on the instrument and your control results demonstrates a sudden and
consistent increase in value, this phenomena is - ANSWERSA shift in performance due to
systematic error
If one of two control values within a single test run is between 2s and 3s on the positive side,
you should - ANSWERSAccept the run if no error can be detected
Dilution - ANSWERSDecrease concentration by adding water/solvent
, Solute - ANSWERSSubstance being dissolved
Solvent - ANSWERSThe substance in which the solute dissolves in
Ratio - ANSWERSComparison of solute to solvent
Example of ratios to dilutions (3/27) - ANSWERSDilution- 1/9
Dilution factor- 9
Serum needed to make dilution- 1
Saline needed to make dilution- 8
Tube dilution - ANSWERSDilution ratio in that tube alone
Solution dilution - ANSWERSActual concentration of the solvent in each tube (dependent on the
previous dilutions)
Final concentration - ANSWERSThe solution dilution of the last tube
%w/w - ANSWERS(Unit weights of solute = grams of solute) / (100 ml of solution = 1dL of
solution)
%w/v - ANSWERS(Grams of solute = grams of solute) / (100 mL of solution = 1 dL of solution)
%v/v - ANSWERS(mL of concentration = mL of concentrate) / 100 mL of solution = 1 dL of
solution)
