CWEA GRADE 1 LAB ANALYST EXAM 2023-2024 ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED
ANSWERS
Celcius - (answer) (F-32)5/9
HPC media water bath - (answer) 45`C, 3hr
Precision - (answer) a measure of how close a series of measurements are to one another
Accuracy - (answer) how close a measurement is to the true value
Electrical Fire - (answer) unplug & sodium bicarbonate
analytical balance - (answer) a device for determining mass that gives highly accurate measurements
top loading balance - (answer) used to determine mass; not as precise as an analytical balance
triple beam balance - (answer) instrument used to measure mass, less sensitive than top loading
Coliform - (answer) Gram-negative rod-shaped bacteria normally present in the intestine; includes E.
coli and other species.
temp and pH - (answer) temp rises, pH drops. Must measure pH within 15 min of collecting sample
Always add ___ to ___ - (answer) acid to water
spectrometer - (answer) a device that spreads light into its different colors
rounding off - (answer) .5=keep # even <.4 stays the same >.6 round up
sig fig rules - (answer) Non-zero digits are always significant.
ANSWERS
Celcius - (answer) (F-32)5/9
HPC media water bath - (answer) 45`C, 3hr
Precision - (answer) a measure of how close a series of measurements are to one another
Accuracy - (answer) how close a measurement is to the true value
Electrical Fire - (answer) unplug & sodium bicarbonate
analytical balance - (answer) a device for determining mass that gives highly accurate measurements
top loading balance - (answer) used to determine mass; not as precise as an analytical balance
triple beam balance - (answer) instrument used to measure mass, less sensitive than top loading
Coliform - (answer) Gram-negative rod-shaped bacteria normally present in the intestine; includes E.
coli and other species.
temp and pH - (answer) temp rises, pH drops. Must measure pH within 15 min of collecting sample
Always add ___ to ___ - (answer) acid to water
spectrometer - (answer) a device that spreads light into its different colors
rounding off - (answer) .5=keep # even <.4 stays the same >.6 round up
sig fig rules - (answer) Non-zero digits are always significant.
