CWEA LAB ANALYST GRADE 1 Questions and Correct Solutions 2024/2025

CWEA LAB ANALYST GRADE 1 Questions and Correct Solutions 2024 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. Any zeros between two significant digits are significant. A final zero or trailing zeros in the decimal portion ONLY are significant. adding sig figs - Answer -smallest number of decimals Alkalinity hold time - Answer -14 days COD hold time - Answer -28 days BOD hold time - Answer -48 hours