CWEA GRADE 1 LAB ANALYST EXAM STUDY GUIDE |
QUESTIONS AND ANSWERS | EXAM 2025/2026
Celcius - CORRECT ANSWER - (F-32)5/9
HPC media water bath - CORRECT ANSWER - 45`C, 3hr
Precision - CORRECT ANSWER - a measure of how close a series of
measurements are to one another
Accuracy - CORRECT ANSWER - how close a measurement is to the true
value
Electrical Fire - CORRECT ANSWER - unplug & sodium bicarbonate
analytical balance - CORRECT ANSWER - a device for determining mass that
gives highly accurate measurements
top loading balance - CORRECT ANSWER - used to determine mass; not as
precise as an analytical balance
triple beam balance - CORRECT ANSWER - instrument used to measure
mass, less sensitive than top loading
Coliform - CORRECT ANSWER - Gram-negative rod-shaped bacteria
normally present in the intestine; includes E. coli and other species.
, temp and pH - CORRECT ANSWER - temp rises, pH drops. Must measure
pH within 15 min of collecting sample
Always add to - CORRECT ANSWER - acid to water
spectrometer - CORRECT ANSWER - a device that spreads light into its
different colors
rounding off - CORRECT ANSWER - .5=keep # even <.4 stays the same >.6
round up
sig fig rules - CORRECT ANSWER - Non-zero digits are always significant.
Any zeros between two significant digits are significant.
A final zero or trailing zeros in the decimal portion ONLY are significant.
adding sig figs - CORRECT ANSWER - smallest number of decimals
Alkalinity hold time - CORRECT ANSWER - 14 days
COD hold time - CORRECT ANSWER - 28 days
BOD hold time - CORRECT ANSWER - 48 hours
pH hold time - CORRECT ANSWER - 15 min
Turbidity hold time - CORRECT ANSWER - 48 hours
BOD Temp Incubator - CORRECT ANSWER - 20+/- 1`C
QUESTIONS AND ANSWERS | EXAM 2025/2026
Celcius - CORRECT ANSWER - (F-32)5/9
HPC media water bath - CORRECT ANSWER - 45`C, 3hr
Precision - CORRECT ANSWER - a measure of how close a series of
measurements are to one another
Accuracy - CORRECT ANSWER - how close a measurement is to the true
value
Electrical Fire - CORRECT ANSWER - unplug & sodium bicarbonate
analytical balance - CORRECT ANSWER - a device for determining mass that
gives highly accurate measurements
top loading balance - CORRECT ANSWER - used to determine mass; not as
precise as an analytical balance
triple beam balance - CORRECT ANSWER - instrument used to measure
mass, less sensitive than top loading
Coliform - CORRECT ANSWER - Gram-negative rod-shaped bacteria
normally present in the intestine; includes E. coli and other species.
, temp and pH - CORRECT ANSWER - temp rises, pH drops. Must measure
pH within 15 min of collecting sample
Always add to - CORRECT ANSWER - acid to water
spectrometer - CORRECT ANSWER - a device that spreads light into its
different colors
rounding off - CORRECT ANSWER - .5=keep # even <.4 stays the same >.6
round up
sig fig rules - CORRECT ANSWER - Non-zero digits are always significant.
Any zeros between two significant digits are significant.
A final zero or trailing zeros in the decimal portion ONLY are significant.
adding sig figs - CORRECT ANSWER - smallest number of decimals
Alkalinity hold time - CORRECT ANSWER - 14 days
COD hold time - CORRECT ANSWER - 28 days
BOD hold time - CORRECT ANSWER - 48 hours
pH hold time - CORRECT ANSWER - 15 min
Turbidity hold time - CORRECT ANSWER - 48 hours
BOD Temp Incubator - CORRECT ANSWER - 20+/- 1`C
