Clinical Chemistry Exam 1 & (Book Chapters 1,2,3,4
Review Questions) With Mark Scheme
Reverse osmosis (RO) is describes as a process: -
In which water is forced through a semipermeable membrane that acts as molecular filter.
Activated carbon filters remove: -
Organic Compounds from water
A 0.22 micron filter will remove: -
Particles with a diameter of 2.2 microns
The unit of resistivity is: -
MQcm
The electrical resistance measured between opposite faces of a 1.00 cm cube of an aqueous solution
at a specified temperature is termed: -
Resistivity
According to CLSI, the resistivity of clinical laboratory reagent water (CLRW) must be: -
> 10 MQcm
Which of the following should not be stored in borosilicate glass because it will etch the inside
surface of the glass container? -
Strong bases (caustics)
Low actinic glassware has which of the following properties? -
High thermal resistance with an amber or red color added as an integral part of the glass
Care must be taken before selecting polyethylene plastic for use as test tubes and disposable transfer
pipettes because? -
Polyethylene can bind or absorb proteins, dyes, stains, and picric acid
1|Page
,Which of the following classes of glassware, including pipettes, is manufactured and calibrated to
deliver the most accurate volume of liquid? -
A
A to deliver to TD pipettes are designed to: -
Drain by gravity
Which of the following devices is used to calibrate laboratory thermometers? -
Gallium melting point cell
Convert 75 mg/dL to mg/L -
750 mg/L
Convert 70.0 mg/dL glucose to mmol/L glucose -
3..89 mmol/L
If a thermometer reads 39F, what is the equivalent degree C? -
3.9C
Convert 200 picograms to grams -
2.0 x 10-10 grams
A patients calcium result is 8.0 mg/dL. Conver this result to mmol/L -
2.0 mmol/L
The surface area of a laboratory bench measures 12 square feet. What is the surface area in square
meters? -
1.115 square meters
A 24 hours stool specimen weighs 0.50 pounds. What is the weigh tin kilograms? -
0.2265 kilograms
2|Page
, A 1 to 4 dilution must be prepared to make a total volume of 100.0 uL. How much serum must be
used? -
25ul
A patients creatinine is outside the linear range of the analyzer; 10ul of serum is added to 90.0 ul of
diluent and the diluted sample is reanalyzed. The creatinine value of the diluted sample is 1.0 mg/dL.
which of the following creatinine values is correct? -
10.0 mg/dL
If 10 ml of sample is added to 190ml of diluent, what is the dilution factor? -
20
A serum creatinine kinase is diluted 1/200 with a result of 50 U/L. What is the patients actual
amylase result? -
10,000
How many grams of sodium hydroxide (NaOH) are required to prepare 250 ml of a 1.00 molar
solution? -
10.0g
What is the concentration in mg/dL of a 140 mEq/L sodium standard? -
322 mg/dL
Convert 145 mEq/L sodium standard to mmoles/L -
145 mmol/L
What is the molarity of a 20.0% w/v glucose solution? -
1.11 molar
Convert 40C to F -
104F
3|Page
Review Questions) With Mark Scheme
Reverse osmosis (RO) is describes as a process: -
In which water is forced through a semipermeable membrane that acts as molecular filter.
Activated carbon filters remove: -
Organic Compounds from water
A 0.22 micron filter will remove: -
Particles with a diameter of 2.2 microns
The unit of resistivity is: -
MQcm
The electrical resistance measured between opposite faces of a 1.00 cm cube of an aqueous solution
at a specified temperature is termed: -
Resistivity
According to CLSI, the resistivity of clinical laboratory reagent water (CLRW) must be: -
> 10 MQcm
Which of the following should not be stored in borosilicate glass because it will etch the inside
surface of the glass container? -
Strong bases (caustics)
Low actinic glassware has which of the following properties? -
High thermal resistance with an amber or red color added as an integral part of the glass
Care must be taken before selecting polyethylene plastic for use as test tubes and disposable transfer
pipettes because? -
Polyethylene can bind or absorb proteins, dyes, stains, and picric acid
1|Page
,Which of the following classes of glassware, including pipettes, is manufactured and calibrated to
deliver the most accurate volume of liquid? -
A
A to deliver to TD pipettes are designed to: -
Drain by gravity
Which of the following devices is used to calibrate laboratory thermometers? -
Gallium melting point cell
Convert 75 mg/dL to mg/L -
750 mg/L
Convert 70.0 mg/dL glucose to mmol/L glucose -
3..89 mmol/L
If a thermometer reads 39F, what is the equivalent degree C? -
3.9C
Convert 200 picograms to grams -
2.0 x 10-10 grams
A patients calcium result is 8.0 mg/dL. Conver this result to mmol/L -
2.0 mmol/L
The surface area of a laboratory bench measures 12 square feet. What is the surface area in square
meters? -
1.115 square meters
A 24 hours stool specimen weighs 0.50 pounds. What is the weigh tin kilograms? -
0.2265 kilograms
2|Page
, A 1 to 4 dilution must be prepared to make a total volume of 100.0 uL. How much serum must be
used? -
25ul
A patients creatinine is outside the linear range of the analyzer; 10ul of serum is added to 90.0 ul of
diluent and the diluted sample is reanalyzed. The creatinine value of the diluted sample is 1.0 mg/dL.
which of the following creatinine values is correct? -
10.0 mg/dL
If 10 ml of sample is added to 190ml of diluent, what is the dilution factor? -
20
A serum creatinine kinase is diluted 1/200 with a result of 50 U/L. What is the patients actual
amylase result? -
10,000
How many grams of sodium hydroxide (NaOH) are required to prepare 250 ml of a 1.00 molar
solution? -
10.0g
What is the concentration in mg/dL of a 140 mEq/L sodium standard? -
322 mg/dL
Convert 145 mEq/L sodium standard to mmoles/L -
145 mmol/L
What is the molarity of a 20.0% w/v glucose solution? -
1.11 molar
Convert 40C to F -
104F
3|Page
