CWEA GRADE I LABORATORY
ANALYST EXAM WITH
QUESTIONS & WELL DETAILED
ANSWERS LATEST UPDATE
2025/2026
1. BOD determination is an empirical test in which standardized lab procedures are used to -
ANSWER determine the relative oxygen requirements of wastewaters, effluents and polluted
waters
2. pH measurement requires the following - ANSWER voltmeter, glass pH electrode, reference
electrode, and a temperature compensating device
3. When preparing diluted calibration standards from a stock standard, use combination of the
following to get the most precise standard - ANSWER Class A volumetric flask and class A
volumetric pipet
4.
Primary reason for measuring alkalinity - ANSWER Used in control of many water and wastewater
unit processes
5. What increases concentration of chloride in wastewater - ANSWER Chloride in human diet and
softeners flushed into sanitary sewer system
,6. Sampling protocol for chloride includes - ANSWER Glass or plastic container with no
preservative
7. At a given temperature, the intensity of the acidic or basic character of a solution is indicated by
- ANSWER pH or hydrogen ion activity
8. The sample receiving log must record time and date sampled - ANSWER Sample collector,
nature of sample, analyses to be performed, preservatives, condition of sample and sample
recipient
9. is alkalinity measured - ANSWER Titration of a sample with a standard solution of either sulfuric
acid or hydrochloric acid to predetermined pH endpoint
10. Alkalinity measures - ANSWER The carbonate, bicarbonate, and hydroxide ion concentration
found in water
11. True color - ANSWER Color from dissolved substances, determine using sample treated to
remove turbidity
12. What increases concentration of chloride in wastewater - ANSWER Chloride in human diet and
softeners flushed into sanitary sewer system
13. Diffusion - ANSWER Movement of molecules from an area of higher concentration to an area of
lower concentration.
14. concentration gradient - ANSWER when molecules are unevenly distributed resulting in an area
of higher and lower concentration
15. what is the correlation between molecular mass and rate of diffusion - ANSWER the larger and
heavier the molecule the slower it will diffuse
16. osmosis - ANSWER Diffusion of water through a selectively permeable membrane
, 17. selectively permeable membrane - ANSWER membrane that only allows certain things to come
in while keeping other things out
18. hypertonic - ANSWER the concentration of solutes is greater outside the cell than inside it
19. hypotonic - ANSWER the concentration of solutes is greater inside the cell than outside of it
20. isotonic - ANSWER the concentration of solutes is the same inside and outside the cell
21. apical surface of epithelial tissue - ANSWER layer of cells closest to the lumen
22. basal surface - ANSWER The bottom layer of epithelial tissue that attaches to the basement
membrane
23. basement membrane - ANSWER Cells at the base of an epithelial layer are attached to this.
24. simple epithelium - ANSWER single layer of cells
25. stratified epithelium - ANSWER multiple layers of cells
26. goblet cells - ANSWER cells that secrete mucus
27. cilia - ANSWER The hair like projections on the outside of cells that move in a wavelike manner
28. lumen - ANSWER An open space, such as within a blood vessel or the intestine or outside the
body (A)
29. simple squamous epithelium - ANSWER identify the type of epithelial cells
ANALYST EXAM WITH
QUESTIONS & WELL DETAILED
ANSWERS LATEST UPDATE
2025/2026
1. BOD determination is an empirical test in which standardized lab procedures are used to -
ANSWER determine the relative oxygen requirements of wastewaters, effluents and polluted
waters
2. pH measurement requires the following - ANSWER voltmeter, glass pH electrode, reference
electrode, and a temperature compensating device
3. When preparing diluted calibration standards from a stock standard, use combination of the
following to get the most precise standard - ANSWER Class A volumetric flask and class A
volumetric pipet
4.
Primary reason for measuring alkalinity - ANSWER Used in control of many water and wastewater
unit processes
5. What increases concentration of chloride in wastewater - ANSWER Chloride in human diet and
softeners flushed into sanitary sewer system
,6. Sampling protocol for chloride includes - ANSWER Glass or plastic container with no
preservative
7. At a given temperature, the intensity of the acidic or basic character of a solution is indicated by
- ANSWER pH or hydrogen ion activity
8. The sample receiving log must record time and date sampled - ANSWER Sample collector,
nature of sample, analyses to be performed, preservatives, condition of sample and sample
recipient
9. is alkalinity measured - ANSWER Titration of a sample with a standard solution of either sulfuric
acid or hydrochloric acid to predetermined pH endpoint
10. Alkalinity measures - ANSWER The carbonate, bicarbonate, and hydroxide ion concentration
found in water
11. True color - ANSWER Color from dissolved substances, determine using sample treated to
remove turbidity
12. What increases concentration of chloride in wastewater - ANSWER Chloride in human diet and
softeners flushed into sanitary sewer system
13. Diffusion - ANSWER Movement of molecules from an area of higher concentration to an area of
lower concentration.
14. concentration gradient - ANSWER when molecules are unevenly distributed resulting in an area
of higher and lower concentration
15. what is the correlation between molecular mass and rate of diffusion - ANSWER the larger and
heavier the molecule the slower it will diffuse
16. osmosis - ANSWER Diffusion of water through a selectively permeable membrane
, 17. selectively permeable membrane - ANSWER membrane that only allows certain things to come
in while keeping other things out
18. hypertonic - ANSWER the concentration of solutes is greater outside the cell than inside it
19. hypotonic - ANSWER the concentration of solutes is greater inside the cell than outside of it
20. isotonic - ANSWER the concentration of solutes is the same inside and outside the cell
21. apical surface of epithelial tissue - ANSWER layer of cells closest to the lumen
22. basal surface - ANSWER The bottom layer of epithelial tissue that attaches to the basement
membrane
23. basement membrane - ANSWER Cells at the base of an epithelial layer are attached to this.
24. simple epithelium - ANSWER single layer of cells
25. stratified epithelium - ANSWER multiple layers of cells
26. goblet cells - ANSWER cells that secrete mucus
27. cilia - ANSWER The hair like projections on the outside of cells that move in a wavelike manner
28. lumen - ANSWER An open space, such as within a blood vessel or the intestine or outside the
body (A)
29. simple squamous epithelium - ANSWER identify the type of epithelial cells
