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You should AVERAGE answering each question in less than 100 seconds for this exam Note: All of the following questions contain only one best answer. Circle the letter that best corresponds with the question. |
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1 |
An analytical balance is sensitive to the nearest |
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a. |
Milligram |
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b. |
1/1000 gram |
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c. |
0.01 gram |
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d. |
0.01 milligram |
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2 |
Composite samples are collected because |
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a. |
the waste characteristics are continually changing |
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b. |
the flow is continually changing |
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c. |
The flow and waste characteristics continually change |
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d. |
none of the above |
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3 |
BOD samples should be collected before chlorination because |
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a. |
chlorine interferes with the activity of organisms |
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b. |
chlorine oxides the buffer solution |
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c. |
chlorine depresses the pH |
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d. |
chlorine reacts with the sodium ions in the titrant, leading to erroneous readings |
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4 |
The standard TSS test requires the Gooch crucible, fiber glass mat, and solids to be dried in the oven at |
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a. |
95 to 100° C |
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b. |
103 to 105° C |
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c. |
105 to 110° C |
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d. |
110 to 115° C |
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5 |
The amperometric titration method is used to measure |
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a. |
BOD |
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b. |
pH |
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c. |
Residual chlorine |
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d. |
DO |
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6 |
The DO depletion on BOD dilution water should be no more than |
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a. |
0.2 mg/L |
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b. |
2.0 mg/L |
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c. |
1.0 mg/L |
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d. |
0.5 mg/L |
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7 |
The most reliable BOD samples use at least the following amount of DO |
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a. |
0.2 mg/L |
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b. |
2.0 mg/L |
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c. |
1.0 mg/L |
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d. |
0.5 mg/L |
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8 |
Heavy metals in high concentration in a sample for BOD will result in |
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a. |
High than normal values |
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b. |
Lower than normal values |
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c. |
Normal values |
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d. |
Metals have no effect on BOD |
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9 |
Compared with the BOD, the COD of a wastewater sample is generally |
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a. |
Greater |
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b. |
Equal |
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c. |
Smaller |
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d. |
BOD and COD do not relate |
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10 |
One of the primary standard solutions used to standardize the titrant solution in the Winkler DO test is |
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a. |
Potassium biiodate |
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b. |
Sodium Chloride |
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c. |
Potassium Permanganate |
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d. |
Phenylarsene oxide |
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11 |
The fecal coliform sample incubation is at |
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a. |
20° C |
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b. |
20° F |
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c. |
35° C |
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d. |
44.5° C |
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12 |
The USEPA recommends that Winkler DO titrations be performed on the entire 300 mL sample. The concentration of titrant used in this case would be |
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a. |
0.025N |
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b. |
0.1N |
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c. |
0.0375N |
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d. |
0.75N |
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13 |
When free flow conditions exist, discharge through a Parshall flume can be obtained by measuring the upstream head at a point ____ of the way into the converging section |
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a. |
1/3 |
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b. |
2/3 |
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c. |
1/2 |
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d. |
3/4 |
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14 |
A sample is "fixed" in the field by |
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a. |
Anchoring the container to the Stream bed |
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b. |
Adding chemicals to prevent the changing of the sample's characteristics |
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c. |
Maintaining a constant temperature of 40° C |
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d. |
None of the above |
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15 |
The monthly report form must be postmarked to the State of Georgia EPD by the ___ day of the month following the reporting period |
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a. |
1st |
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b. |
10th |
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c. |
15th |
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d. |
Last |
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16 |
The sterilized sample bottle used for collecting fecal coliform samples should have a few drops of 10% __________ Solution introduced into the bottle before sterilization |
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a. |
Sulfuric Acid |
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b. |
HCl |
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c. |
Potassium dichromate |
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d. |
Sodium thiosulfate |
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17 |
Sterilization is assumed to be accomplished by holding a temperature of ____for 15 min |
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a. |
100° C |
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b. |
121° C |
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c. |
212° C |
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d. |
100° F |
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18 |
The ammonia sample should be preserved during the holding period by cooling to 4 °C or by |
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a. |
adding NaOH to a pH >12.0 SU |
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b. |
digesting |
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c. |
adding enough sulfuric acid to lower the pH below 2.0 SU |
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d. |
nothing else needed |
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19 |
The maximum allowable holding period for a total phosphorus sample is |
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a. |
28 hours |
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b. |
28 days |
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c. |
2.8 days |
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d. |
24 hours |
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20 |
The maximum allowable holding period for a COD sample is |
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a. |
28 hours |
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b. |
28 days |
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c. |
2.8 days |
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d. |
24 hours |
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21 |
For a laboratory analytical quality control program, duplicate samples should be analyzed |
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a. |
10% of the time |
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b. |
20% of the time |
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c. |
5% of the time |
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d. |
every time |
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22 |
For a laboratory analytical quality control program, known concentration standards should be analyzed |
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a. |
10% of the time |
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b. |
20% of the time |
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c. |
5% of the time |
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d. |
every time |
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23 |
The standard titrant used for COD analysis is |
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a. |
PAO |
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b. |
ferrous ammonium sulfate |
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c. |
sodium thiosulfate |
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d. |
sulfuric acid |
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24 |
The most usual titrant concentration employed in COD analysis is |
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a. |
0.0375N |
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b. |
0.025N |
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c. |
0.25N |
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d. |
1N |
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25 |
A lighted-colored, coliform-free circular area in the center of a membrane filter is probably because of |
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a. |
Poor quality media |
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b. |
an air bubble under the MF |
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c. |
Poor distribution of sample to the membrane filter |
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d. |
improper incubation temperature |
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26 |
Nitrification in a wastewater treatment facility involves the ultimate conversion of ammonia-nitrogen to |
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a. |
Effluent suspended solids |
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b. |
Total Kjeldahl Nitrogen |
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c. |
Nitrite-nitrogen |
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d. |
Nitrate-nitrogen |
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27 |
The simplest chemical form of phosphorus produced by persulfate digestion is |
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a. |
Orthophosphate-P |
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b. |
Hydrolyzable-P |
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c. |
Organic-P |
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d. |
Polyphosphate-P |
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28 |
A preliminary step to nesslerization in the ammonia-nitrogen analysis involves |
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a. |
Digestion |
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b. |
Distillation |
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c. |
Demineralization |
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d. |
Filtration |
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29 |
The most common method of determining reactive phosphorus is _____ reduction |
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a. |
Chromic-sulfuric acid |
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b. |
Potentiometric |
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c. |
Ascorbic acid |
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d. |
Titrimetric |
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30 |
The range of colonies on an acceptable fecal coliform plate should be |
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a. |
0 to 10 |
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b. |
20 to 60 |
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c. |
100 to 200 |
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d. |
200 to 400 |
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31 |
Six (6) micrograms per liter equals |
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a. |
0.006 mg/L |
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b. |
0.06 mg/L |
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c. |
0.6 mg/L |
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d. |
6 mg/L |
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32 |
Monitoring records should be maintained for a minimum of ___ |
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a. |
1 month |
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b. |
3 months |
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c. |
1 year |
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d. |
3 years |
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33 |
37.5 mL of 0.050 M H2SO4 is added to 42.7 mL of 0.092 M NaOH. The final solution is |
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a. |
acidic |
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b. |
basic |
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c. |
neutral |
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d. |
not predictable |
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34 |
37.5 mL of 0.050 M H2SO4 is added to 42.7 mL of 0.092 M NaOH. What is the concentration of the excess acid or base? |
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a. |
0.178 M |
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b. |
0.0048 M |
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c. |
0.0042 M |
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d. |
0.0021 M |
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35 |
37.5 mL of 0.050 M H2SO4 is added to 42.7 mL of 0.092 M NaOH. |
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a. |
0.0234 |
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b. |
0.0500 |
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c. |
0.0439 |
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d. |
0.0117 |
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36 |
How many gallons of water are in a circular tank 37 ft high and 85 ft in diameter? |
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a. |
1.75 MG |
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b. |
1.57 MG |
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c. |
209,850.125 gallons |
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d. |
1.99 MG |
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37 |
What is the retention time of a sedimentation basin 135 ft by 45 ft by 11 ft with a flow of 2.75 MGD? |
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a. |
4 hr 22 min |
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b. |
4 hr 56 min |
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c. |
4 hr 93 min |
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d. |
4 hr 36 min |
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38 |
To convert Fahrenheit to Celsius you |
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a. |
add 32 and multiply by 9/5 |
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b. |
subtract 32 and multiply by 5/9 |
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c. |
subtract 32 and multiply by 9/5 |
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d. |
none of the above |
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39 |
Percent recovery is expressed as |
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a. |
ppm |
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b. |
mg/L |
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c. |
% |
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d. |
ppb |
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40 |
The expression [(x-avg.x)2/(n-1)]½ indicates the estimate of the |
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a. |
mean |
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b. |
coefficient of variation |
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c. |
variance |
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d. |
standard deviation |
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41 |
What is one of the adverse affects of discharging phosphorus into a receiving steam? |
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a. |
Stimulates nuisance quantities of algal growth |
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b. |
raising the turbidity to an unhealthy level |
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c. |
reduces photosynthesis |
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d. |
causes a decrease in net primary production |
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42 |
The term "total phosphorus" refers to |
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a. |
all amounts of phosphorus in the sample regardless of form |
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b. |
phosphorus not combined with organic compounds |
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c. |
orthophosphate |
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d. |
condensed phosphate |
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43 |
The reason for acid digestion of the sample for analyses of total phosphorus is |
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a. |
to determine the polyphosphates content |
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b. |
to determine the organic phosphate compounds |
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c. |
to determine quantitatively the orthophosphates |
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d. |
all of the above |
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44 |
Which of the below may affect the analytical results? |
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a. |
Cleanliness of the glassware |
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b. |
Proper apparatus |
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c. |
Improper techniques |
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d. |
both a and c |
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45 |
When reading an aqueous solution with volumetric glassware the reading should be |
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a. |
read at the top of the meniscus |
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b. |
read when the bottom of the meniscus is tangent to the calibration mark |
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c. |
at the middle of the meniscus |
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d. |
none of the above |
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46 |
Which are sources of error when using volumetric glassware? |
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a. |
Improper techniques |
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b. |
Temperature variations |
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c. |
All of the above |
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d. |
None of the above |
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47 |
Glassware is clean when |
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a. |
it is washed in the proper cleaning reagents |
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b. |
a film of liquid never breaks at any point |
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c. |
there are no water spots |
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d. |
none of the above |
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48 |
Variation in test results may not be caused by changes in |
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a. |
water or material being examined |
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b. |
sampling procedures |
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c. |
testing (analyst, procedure, reagents, equipment) |
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d. |
none of the above |
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49 |
Beakers are NOT used for |
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a. |
mixing |
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b. |
weighing chemicals |
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c. |
heating solutions |
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d. |
measuring exact volumes |
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50 |
What is EDTA? |
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a. |
ethylenediaminetetraacetic acid |
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b. |
a chelating agent |
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c. |
complexes metal ions |
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d. |
all of the above |
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51 |
How does temperature affect pH? |
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a. |
direct |
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b. |
inverse |
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c. |
indeterminant |
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d. |
no effect |
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52 |
The ability of solutions to carry a current is called |
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a. |
resistivity |
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b. |
conductivity |
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c. |
electrolytes |
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d. |
electricity |
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53 |
Conductivity measurements should be reported at what temperature? |
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a. |
20 ± 0.1° C |
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b. |
20 ± 1° C |
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c. |
25 ± 0.1° C |
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d. |
25 ± 1° C |
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54 |
On a mean QC chart, the control limit is how many standard deviations from the mean? |
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a. |
1 |
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b. |
2 |
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c. |
3 |
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d. |
4 |
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55 |
What are the two common oxidation states of chromium? |
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a. |
+2 and +4 |
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b. |
- 2 and - 4 |
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c. |
+4 and +5 |
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d. |
+3 and +6 |
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56 |
When a series of numbers is added, the sum should be rounded off to |
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a. |
2 decimal places regardless of the number of decimal places in the numbers being added |
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b. |
the same number of decimal places as the figure with the most number of decimal places |
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c. |
the same number of decimal places as the figure with the least number of decimal places |
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d. |
3 decimal places regardless of the number of decimal places in the numbers being added |
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57 |
A series of numbers is added: (23.46 + 2.666 + 5.1) = 31.226. The result should be reported as |
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a. |
31.226 |
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b. |
31 |
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c. |
31.2 |
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d. |
31.23 |
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58 |
A BOD is calculated as 23.50 and should be rounded to 2 significant figures. The result reported is |
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a. |
23.0 |
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b. |
23 |
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c. |
24.0 |
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d. |
24 |
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59 |
Round the result of multiplication or division calculation to the number of significant figures present |
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a. |
in the factor with the most significant figures |
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b. |
in the factor with the least significant figures |
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c. |
in the total number of decimal places in all the factors |
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d. |
either a or c |
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60 |
Another expression of the mean is the |
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a. |
standard deviation |
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b. |
coefficient of variation |
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c. |
average |
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d. |
median |
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61. |
The phenolphthalein alkalinity of a water sample is zero if |
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a. |
the pH is less than 8.3 SU |
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b. |
The sample hardness is less than 20 mg/L |
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c. |
the pH is more than 8.3 SU |
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d. |
the sample is anaerobic |
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62. |
Turbidity is measured by using |
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a. |
a nephelometer |
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b. |
matched nessler tubes |
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c. |
a DO meter |
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d. |
a spectrophotometer |
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63. |
An example of a base is |
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a. |
ammonium hydroxide |
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b. |
ammonium chloride |
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c. |
sodium sulfate |
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d. |
sodium hypochlorite |
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64. |
An example of an acid is |
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a. |
ammonium hydroxide |
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b. |
ammonium chloride |
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c. |
sodium sulfate |
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d. |
sodium hypochlorite |
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a. |
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b. |
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c. |
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d. |
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a. |
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b. |
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c. |
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d. |
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a. |
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b. |
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c. |
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d. |
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a. |
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b. |
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c. |
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d. |
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a. |
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b. |
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c. |
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d. |
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a. |
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b. |
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c. |
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d. |
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a. |
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b. |
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c. |
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d. |
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