Water Treatment Plant Operations Quiz! Trivia
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What do you know about wastewater treatment, and do you think you can pass this quiz? A wastewater treatment plant cleans sewage and water so that they can be put back into the environment. These plants remove solids and pollutants, break down organic matter, and replenish treated water's oxygen content. If you would like to understand more about water treatment plant operations, this is the quiz for you.
- 1.
The collection of a bad sample or a bad laboratory result is about as useful as no result.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
This statement suggests that obtaining a bad sample or a bad laboratory result is just as useless as not having any result at all. In other words, if the sample collected is of poor quality or the laboratory result is inaccurate or unreliable, it provides no valuable information or guidance. Therefore, the statement implies that having a bad sample or a bad laboratory result is equivalent to having no result at all, making the answer "True."Rate this question:
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- 2.
A Teflon stopcock on a buret frequently needs to be lubricated.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because Teflon is a self-lubricating material and does not require additional lubrication. Teflon has a low coefficient of friction, which means that it has a smooth surface and can move easily without the need for lubrication. Therefore, a Teflon stopcock on a buret does not frequently need to be lubricated.Rate this question:
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- 3.
The graduated cylinder is used to measure volumes of liquid with an accuracy greater than burets but less than beakers or flasks.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
The statement is false because graduated cylinders actually have a higher accuracy than beakers or flasks when it comes to measuring volumes of liquid. Burets, on the other hand, have a higher accuracy than graduated cylinders.Rate this question:
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- 4.
Having good laboratory equipment and using the correct methods are enough to ensure correct analytical results.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Having good laboratory equipment and using the correct methods are important factors in obtaining accurate analytical results, but they are not enough to ensure correct results. Other factors such as human error, contamination, sample handling, and calibration of instruments can also influence the accuracy of analytical results. Therefore, it is important to consider all these factors and implement quality control measures to ensure the correctness of analytical results.Rate this question:
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- 5.
A Representative sample must be collected in order for test results to have any significant meaning.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
In order for test results to have any significant meaning, it is important to collect a representative sample. A representative sample is a subset of the population that accurately reflects the characteristics and diversity of the entire population. By collecting a representative sample, we can ensure that the test results are not biased and can be generalized to the larger population. Without a representative sample, the test results may not accurately represent the population, leading to unreliable and invalid conclusions. Therefore, it is true that a representative sample must be collected for test results to have any significant meaning.Rate this question:
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- 6.
Always pour acid into water, never the reverse.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
When diluting acid with water, it is important to always pour the acid into the water and not the other way around. This is because pouring water into acid can cause a violent reaction, resulting in the acid splashing out and potentially causing harm. By pouring acid into water, the acid gets diluted gradually and reduces the risk of a dangerous reaction.Rate this question:
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- 7.
Water should be used to extinguish grease fires, electrical fires, and metal fires.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Water should not be used to extinguish grease fires, electrical fires, and metal fires because it can actually make the situation worse. Water can cause hot grease to splatter and spread the fire, it can conduct electricity and potentially electrocute the person attempting to put out the fire, and it can react with certain metals and create dangerous reactions. Therefore, it is important to use the appropriate extinguisher for each type of fire.Rate this question:
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- 8.
Well pumps and casings can contribute to groundwater sample contamination.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
PG 529 11.211 Groundwater.Rate this question:
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- 9.
Any chlorine taste and odor that may result from chlorination would generally be from the dichloramine or nitrogen trichloride nuisance residuals.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Pg 539 Right side J 1Rate this question:
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- 10.
The presence of coliform organisms in the water indicates the potential presence of pathogenic organisms in the water.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
PG 544 4 a 2nd paragraphRate this question:
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- 11.
All coliforms found in the total coliform test come from human wastes.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
PG 544 4 a 2nd paragraphRate this question:
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- 12.
The operator should verify the results of the coagulant dose jar test with visual observation of what is actually happening in the flocculation basin.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
PG 568 H Right bottom.Rate this question:
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- 13.
The pH scale runs from 1 to 14.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
PG 570 7 aRate this question:
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- 14.
The stronger the intensity of the acidity, the greater will be the pH.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
PG 570 7 aRate this question:
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- 15.
The Greater the intensity of scattered light, the lower the turbidity.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
PG 9 A Right column topRate this question:
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- 16.
How can operators obtain the necessary information to monitor the treatment processes and to ensure a safe and pleasant-tasting drinking water for all who use it?
- A.
By consulting with operators from nearby plants
- B.
By contacting regulatory agencies and verifying available information
- C.
By laboratory quality control tests
- D.
By walking thorough the plant and observing the performance of the treatment processes
Correct Answer
C. By laboratory quality control testsExplanation
PG 507 11.00Rate this question:
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- 17.
What is a chemical compound?
- A.
A substance composed of two or more different elements and whose composition is constant
- B.
A substance that cannot be separated into its constituent parts and sill retain its chemical identity
- C.
An organic substance that can cause or speed up chemical reactions
- D.
The smallest division of a compound that still retains or exhibits all the properties of the substance.
Correct Answer
A. A substance composed of two or more different elements and whose composition is constantExplanation
PG 508 11.02Rate this question:
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- 18.
What is the use of a flask?
- A.
To contain and mix chemicals
- B.
The membranes in the nose
- C.
The proper line of vision to read a liquid in a buret
- D.
The viscosity measurement of a liquid
Correct Answer
A. To contain and mix chemicalsExplanation
PG 510Rate this question:
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- 19.
What is a meniscus?
- A.
The curve of the surface of a liquid
- B.
The membranes in the nose
- C.
The proper line of vision to read a liquid in a buret
- D.
The viscosity measurement of a liquid
Correct Answer(s)
A. The curve of the surface of a liquid
B. The membranes in the noseExplanation
PG 518Rate this question:
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- 20.
Why should graduated cylinders never be heated in an open flame?
- A.
Because the heat will increase the rate of chemical reactions
- B.
Because the liquid will boil
- C.
Because they will break
- D.
Because toxic gas may be formed
Correct Answer
C. Because they will breakExplanation
PG 518Rate this question:
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- 21.
Why should corrosive materials never be poured down an ordinary sink or drain?
- A.
They can corrode away the drain pipe or trap
- B.
They can neutralize the contents of the drain pipe and trap
- C.
They can prevent toxic fumes from passing through the sewer system
- D.
They can release odors into the sewer system
Correct Answer
A. They can corrode away the drain pipe or trapExplanation
PG 526Rate this question:
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- 22.
Fires are classified as A, B, C, or D fires based on which item?
- A.
The extinguishing method available
- B.
The heat generated by the fire
- C.
The location of the fire
- D.
The type of material being consumed
Correct Answer
D. The type of material being consumedExplanation
PG 526Rate this question:
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- 23.
What is a representative sample?
- A.
A sample collected by a representative or typical sample collector.
- B.
A sample portion of material or water that is as nearly identical in content and consistency as possible to that in the larger body of material or water being sampled
- C.
A single sample of water collected at a particular time and place that represents the composition of the water only at that time and place.
- D.
An individual sample before it is combined with other samples in proportion to the rate of flow when the sample was collected
Correct Answer
B. A sample portion of material or water that is as nearly identical in content and consistency as possible to that in the larger body of material or water being sampledExplanation
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- 24.
Why do fire hydrants as sampling points give erratic (uneven) results?
- A.
Due to the difficulty in obtaining small flows to collect accurate samples
- B.
Due to the location of fire hydrants being dictated by fire protection standards
- C.
Due to the possibility of a fire developing during a sample collection session.
- D.
Due to the way they are constructed and their lack of use.
Correct Answer
D. Due to the way they are constructed and their lack of use.Explanation
PG 529 11.213Rate this question:
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- 25.
The lead and copper rule calls for what types of samples?
- A.
Composite
- B.
First-draw or first-flush
- C.
Grab
- D.
Laboratory
Correct Answer
B. First-draw or first-flushExplanation
PG 533 11.243Rate this question:
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- 26.
How can water treatment plant operators obtain a good index of the degree of bacteriologic safety of water supply without testing for specific pathogenic microorganisms?
- A.
Analyzing the water for the presence of an "indicator organism," the coliform group of bacteria.
- B.
Conduct a consumer acceptance test
- C.
Issue boil water orders
- D.
Perform a safe drinking water test
Correct Answer
A. Analyzing the water for the presence of an "indicator organism," the coliform group of bacteria.Explanation
PG 544Rate this question:
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- 27.
Why is the geometric mean sometimes used to describe the results of MPN ( most probable number) tests?
- A.
It is easiest to calculate on an electronic calculator
- B.
It is the only way to summarize with a single MPN value the results from a series of samples.
- C.
It is the values that is best understood by most engineers
- D.
It most nearly describes most of the MPNs when there are a few very large values that would distort the mean.
Correct Answer
D. It most nearly describes most of the MPNs when there are a few very large values that would distort the mean.Explanation
PG 555Rate this question:
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- 28.
What is a buffer?
- A.
A representative portion of a sample, often an equally divided portion of a sample
- B.
A solution or liquid whose chemical make up neutralizes acids or bases without a great change in pH
- C.
A sterile membrane that is free from the living germs of disease, fermentation, or putrefaction.
- D.
An organism that indicates the potential presence of a pathogen
Correct Answer
B. A solution or liquid whose chemical make up neutralizes acids or bases without a great change in pHExplanation
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- 29.
When performing a coliform test using the membrane filter method, what do the letters CFU stand for?
- A.
Cold formed unit
- B.
Colony formation unit
- C.
Correctly fertilized unit
- D.
Cubic fermentation unit
Correct Answer
B. Colony formation unitExplanation
PG 556 - 6Rate this question:
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- 30.
What are the jar tests designed to do?
- A.
To analytically test waters for chemical constituents
- B.
To contain or store water samples in a jar until tested
- C.
To precisely duplicate actual conditions in a water treatment facility.
- D.
To show the effectiveness of chemical treatment in a water treatment facility.
Correct Answer
D. To show the effectiveness of chemical treatment in a water treatment facility.Explanation
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- 31.
By relating laboratory results to treatment operations, the water treatment operator can perform which tasks?
- A.
Accurately record laboratory test results
- B.
Determine the efficiency of the treatment processes
- C.
Develop a clear understanding of laboratory procedures
- D.
Identify potential problems before they affect finished water quality
- E.
Select the most effective operational procedures.
Correct Answer(s)
B. Determine the efficiency of the treatment processes
D. Identify potential problems before they affect finished water quality
E. Select the most effective operational procedures.Explanation
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- 32.
Which items are required in order to prevent bad laboratory results?
- A.
Accurate spreadsheets for recording laboratory results
- B.
Constant maintenance and calibration of laboratory equipment
- C.
Continuous training of laboratory personnel
- D.
Strict enforcement of all laboratory safety regulations
- E.
Use of correct laboratory procedures
Correct Answer(s)
B. Constant maintenance and calibration of laboratory equipment
E. Use of correct laboratory proceduresExplanation
PG 507Rate this question:
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- 33.
Which factors can lead to poor quality of laboratory data?
- A.
Calculation mistakes
- B.
Computer crashes
- C.
Deteriorated reagents and standards
- D.
Poorly operating instruments
- E.
Sloppy laboratory technique
Correct Answer(s)
A. Calculation mistakes
C. Deteriorated reagents and standards
D. Poorly operating instruments
E. Sloppy laboratory techniqueExplanation
PG 521 11.15Rate this question:
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- 34.
Hazardous materials in the water treatment plant laboratory include which items?
- A.
Corrosive materials
- B.
Distilled water
- C.
Explosive materials
- D.
Flammable materials
- E.
Toxic materials
Correct Answer(s)
A. Corrosive materials
C. Explosive materials
D. Flammable materials
E. Toxic materialsExplanation
PG 522 11.16Rate this question:
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- 35.
Which basic personal safety and hygiene rules must always be followed when working in a laboratory?
- A.
Always wear a lab coat or apron to protect your skin and clothes
- B.
Do not keep food in a refrigerator that is used for chemical or sample storage
- C.
Never work alone
- D.
Wear insulated gloves when handling hot objects
- E.
Wear protective goggles or eyeglasses at all times
Correct Answer(s)
A. Always wear a lab coat or apron to protect your skin and clothes
B. Do not keep food in a refrigerator that is used for chemical or sample storage
C. Never work alone
D. Wear insulated gloves when handling hot objects
E. Wear protective goggles or eyeglasses at all timesExplanation
PG 524 11.161Rate this question:
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- 36.
Obtaining good results from laboratory water testing depends to a great extent upon which factors?
- A.
Ensuring that the sample taken is truly representative of the water under consideration.
- B.
Following safe laboratory and sample collection procedures
- C.
Protecting and preserving the samples until they are analyzed
- D.
Recording data on an approved laboratory spreadsheet
- E.
Using proper sampling techniques
Correct Answer(s)
A. Ensuring that the sample taken is truly representative of the water under consideration.
C. Protecting and preserving the samples until they are analyzed
E. Using proper sampling techniquesExplanation
PG 528 11.20Rate this question:
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- 37.
What are the greatest sources of errors in laboratory tests?
- A.
Failure to communicate testing procedures to management
- B.
Improper sampling
- C.
Lack of enough mixing during testing
- D.
Poor application of safety procedures
- E.
Poor sampling preservation
Correct Answer(s)
B. Improper sampling
C. Lack of enough mixing during testing
E. Poor sampling preservationExplanation
PG 528Rate this question:
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- 38.
Which water quality indicators may chance with time? Needs verified
- A.
Coliform bacteria
- B.
Dissolved gases
- C.
PH
- D.
Residual chlorine
- E.
Tempurature
Correct Answer(s)
C. pH
D. Residual chlorine
E. TempuratureExplanation
The water quality indicators that may change with time are pH, residual chlorine, and temperature. pH is a measure of how acidic or alkaline the water is, and it can fluctuate over time due to various factors such as the presence of certain minerals or the activity of microorganisms. Residual chlorine, which is added to water as a disinfectant, can also decrease over time as it reacts with organic matter or is exposed to sunlight. Temperature can vary depending on external factors such as weather conditions or the time of day.Rate this question:
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- 39.
Which precautions should be considered when measuring the alkalinity of a water sample?
- A.
The sample pH should be titrated to neutral before analysis
- B.
The sample should be analyzed as soon as possible
- C.
The sample should be heated to the temperature of the lab room before analysis
- D.
The sample should be vigorously mixed before analysis
- E.
The sample should not be agitated, warmed, filtered, diluted, concentrated, or altered in any way.
Correct Answer(s)
B. The sample should be analyzed as soon as possible
E. The sample should not be agitated, warmed, filtered, diluted, concentrated, or altered in any way.Explanation
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- 40.
Which precautions should be considered when measuring the chlorine residual?
- A.
For accurate results, careful pH control is essential
- B.
If nitrogen trichloride or chlorine dioxide are present, special procedures are necessary
- C.
If the sample contains oxidized manganese, an inhibitor must be used.
- D.
Operators using the DPD colorimetric method need to be aware of the potential error of a "false positive" chlorine residual reading
- E.
Samples should be analyzed as soon as possible after collection.
Correct Answer(s)
A. For accurate results, careful pH control is essential
B. If nitrogen trichloride or chlorine dioxide are present, special procedures are necessary
C. If the sample contains oxidized manganese, an inhibitor must be used.
D. Operators using the DPD colorimetric method need to be aware of the potential error of a "false positive" chlorine residual reading
E. Samples should be analyzed as soon as possible after collection.Explanation
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- 41.
The chlorine demand of water varies with which factors?
- A.
Alkalinity
- B.
Amount of chlorine applied
- C.
Length of contact time
- D.
PH
- E.
Temperature
Correct Answer(s)
B. Amount of chlorine applied
C. Length of contact time
D. pH
E. TemperatureExplanation
PG 541Rate this question:
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- 42.
Which test can be performed to improve the jar test and interpretation of the results?
- A.
Alkalinity (before and after)
- B.
Corrosivity (before and after)
- C.
Filtered turbidity of the supernatant
- D.
PH (before and after)
- E.
Turbidity of the supernatant (before and after)
Correct Answer(s)
A. Alkalinity (before and after)
C. Filtered turbidity of the supernatant
D. pH (before and after)
E. Turbidity of the supernatant (before and after)Explanation
The correct answer is a combination of multiple tests that can be performed to improve the jar test and interpretation of the results. These tests include measuring the alkalinity before and after the test, as well as the pH before and after. Additionally, the filtered turbidity of the supernatant and the turbidity of the supernatant before and after the test can also be measured. These tests provide valuable information about the water sample and help in determining the effectiveness of the treatment process.Rate this question:
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- 43.
pH plays an important role in which water treatment processes?
- A.
Coagulation
- B.
Corrosion control
- C.
Disinfection
- D.
Filtration
- E.
Softening
Correct Answer(s)
A. Coagulation
B. Corrosion control
C. Disinfection
E. SofteningExplanation
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- 44.
How do operators use the results of turbidity testing?
- A.
To detect problems in coagulation and sedimentation
- B.
To evaluate pH levels
- C.
To recognize changes in raw water quality
- D.
To test alkalinity concentrations
- E.
To troubleshoot filtration problems
Correct Answer(s)
A. To detect problems in coagulation and sedimentation
C. To recognize changes in raw water quality
E. To troubleshoot filtration problemsExplanation
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- 45.
Which precautions should be considered when measuring the turbidity of water?
- A.
Discard scratched or etched sample tubes
- B.
Fill the tubes with samples and standards that have been agitated thoroughly, and allow sufficient time for bubbles to escape.
- C.
Sample tubes must be kept scrupulously clean, both inside and out
- D.
Turbidity of a sample an change after the sample is collected and shaking the sample will not re-create the original turbidity.
- E.
Turbidity should be measured in a sample as soon as possible to obtain accurate results.
Correct Answer(s)
A. Discard scratched or etched sample tubes
B. Fill the tubes with samples and standards that have been agitated thoroughly, and allow sufficient time for bubbles to escape.
C. Sample tubes must be kept scrupulously clean, both inside and out
D. Turbidity of a sample an change after the sample is collected and shaking the sample will not re-create the original turbidity.
E. Turbidity should be measured in a sample as soon as possible to obtain accurate results.Explanation
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Mar 21, 2023Quiz Edited by
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Apr 22, 2010Quiz Created by
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