WSO Water Treatment Grade 1 Practice Test

These questions are part of the practice quiz. Start practicing

• What is the purpose of maintaining a chlorine residual in treated water?
• What is SCADA and how is it useful?
• What constitutes carbonate hardness?
• What process involves the treatment of water to achieve safe drinking standards?
• What is the primary factor assessed to determine disinfection effectiveness?
• At what fluoride concentration in drinking water is there a risk of teeth becoming pitted?
• What is a common measure of how well a filter is performing?
• Which type of filter effectively removes iron and manganese using a combination of adsorption and oxidation?
• What are the principal cations that primarily contribute to water hardness?
• Where should Safety Data Sheet (SDS) information be stored?
• Which of the following is NOT a reason to monitor fluoride levels in treated water?
• What does the zeta potential measure in relation to particulate matter?
• Iron deposits caused by the corrosion of cast-iron mains are called?
• What is the term for the movement of water with air currents in the atmosphere?
• In conventional water treatment plants, flocculation basins are primarily designed for what type of flocculation?
• What is the Maximum Contaminant Level (MCL) for fluoride in drinking water?
• Which of the following is the principal scale-forming substance in water?
• What are the treatment technique requirements for Copper?
• Disinfection of water wells with free chlorine requires exposure for how long?
• After respiratory problems, what is usually the first effect of exposure to chlorine?
• What are three broadly classified areas from which samples are generally collected?
• What is the most important reason to reduce turbidity in water treatment?
• What is assessed in a sanitary survey?
• What is a potential consequence of inadequate backwashing in filter systems?
• Which element is known for being a dark reddish-brown liquid with a strong odor?
• Which component is essential for assessing a well's capacity effectively?
• What are the treatment technique requirements for Lead?
• What can excessive turbidity indicate about water quality?
• What can be broadly defined as the wearing away or deterioration of a material due to chemical reactions with its environment?
• What is the term for the underground layer where groundwater accumulates?
• What is the volume in million gallons for 318 acre-feet?
• Which contaminant has a Maximum Contaminant Level (MCL) of 4.0 mg/L?
• Which factor contributes to the high cost of caustic-soda softening?
• Which type of plant grows in shallow water on or near the shoreline, rooting in the bottom mud?
• What is the Maximum Contaminant Level (MCL) for Total Trihalomethanes (TTHM) in drinking water?
• What characteristic of ozone makes it challenging to maintain a residual in water?
• What additional factor, alongside filtrate flow rate and length of filtration cycle, affects process recovery?
• How often should operators record bed expansion measurements and evaluate the bed surface?
• What is a notable virtue of mechanical mixers in water treatment?
• As solids settle to the bottom of a sedimentation basin, what layer develops?
• Which contaminant has a Maximum Contaminant Level (MCL) of 0.010 mg/L?
• What are the substances that are described as lacking carbon and include acids, bases, and salts?
• What is the main characteristic of the breakpoint chlorination?
• What is true about sodium fluoride?
• Which component is NOT part of conventional water treatment?
• What is the van der Waals force?
• Which chemical compound is often associated with imparting color to laundry and beverages due to its presence in water?
• What is a potential consequence of using lime in water treatment?
• At what angle are bar screen assemblies typically installed from the horizontal in a waterway?
• A ___ is a single-volume sample collected at one time from one place.
• What can be an effect of untreated hard water on plumbing systems?
• Which chemical is often used to treat water for effective disinfection purposes?
• Why are filter operation records crucial?
• How is methane primarily removed from water due to its low solubility?
• What is a significant concern when using a direct river intake for drinking water treatment?
• What is the Maximum Contaminant Level (MCL) for Haloacetic Acids (HAA5) in drinking water?
• Which regulation is designed to protect drinking water consumers from health risks associated with residual disinfectants and disinfection by-products?
• Which safety measure is crucial when handling chemicals in water treatment?
• What is a reason why caustic-soda softening is not popular?
• What condition hinders effective disinfection of water due to suspended particles?
• Which of the following best describes the focus of filter operation records?
• What is the process used to eliminate pathogenic organisms from water?
• What is the process of adding CO₂ to water known as?
• What is the purpose of using scientific notation?
• Which of the following is NOT a reason that corrosion and scaling are controlled?
• The purpose of packing is to:
• What details should be included in the operating records for screening equipment?
• What are the two critical factors affecting the effectiveness of chlorination?
• What should employees be trained on regarding SDS?
• Which part of the human body is most vulnerable to allowing microorganisms to enter?
• In order to solve for an unknown value in an equation, what must you know?
• What is typically adjusted in water treatment facilities to control scaling?
• What is the treatment process that controls corrosion or scaling known as?
• Which type of pump has an impeller rotating in a channel of constant cross-sectional area, which imparts mixed or radial flow to the water?
• What is the purpose of a diffuser in water treatment?
• Where is the most effective place to control organics in drinking water?
• What is the term for water movement with air currents in the atmosphere?
• What does linear measurement define?
• What are common methods of algae control in lakes and reservoirs?
• What effect does excessive fluoride concentration have on dental health?
• What is the general guideline when speaking to reporters?
• Which regulation sets the performance goals for filters used in water treatment?
• What type of intake is usually located near a lake or river to capture seepage from sediment?
• When changing a chlorine cylinder or container, how often should a new gasket be used?
• How can virgin greensand be regenerated?
• In which direction does water naturally flow within the landscape?
• How does calcium carbonate coating help in water systems?
• Which regulated substances can be effectively removed through aeration?
• Consistency among laboratories in analytical results is overseen by which entity?
• Within what time frame must acute MCL violations be reported to the public?
• Which of the following describes a characteristic of soft water?
• Which factor is crucial for effective groundwater well operation?
• At what pH range does alum work best in water treatment?
• What is noncarbonate hardness attributed to?
• In shallow-depth settling units, at what angle must modules be slanted to be self-cleaning?
• What MCL is assigned to Haloacetic Acids (HAA5) in drinking water?
• What natural electrical force helps to keep colloidal particles apart during treatment?
• What is total hardness a sum of?
• What is the purpose of establishing Maximum Contaminant Levels (MCLs) for drinking water?
• What process follows flocculation in water treatment?
• Which device is responsible for collecting settled water from a sedimentation basin?
• When can raw water be normally softened using lime alone?
• What is the term for the gas transfer process used in water treatment to dissolve air into water?
• What is the process called whereby water moves from plants to the atmosphere?
• The flow rate of liquid expressed in ____ is analogous to the flow rate of electricity expressed in amperes.
• What defines a confined space?
• Which aspect of water is measured by turbidity?
• What are small, prefabricated units designed for water treatment called?
• What important function does coagulation serve in the water treatment process?
• What term is used to describe particles held in suspension due to the flow of water?
• Which basic electrical unit is used to measure a material's opposition to the flow of electricity?
• Which of the following is NOT a reason that meters, recorders, alarms, and automatic control systems are installed in a water plant?
• What is a microstrainer used for in water treatment?
• What triggers a violation notice in drinking water regulations?
• Which statement about viruses is true?
• Why has the percussion drilling method, known as the cable tool method, waned in popularity?
• How frequently should the fluoride concentration of treated water be assessed?
• Which of the following is NOT a class of employee designated to work in confined spaces?
• Which process is commonly employed to concentrate sludge in water treatment?
• What is the most frequently used in-situ well treatment method?
• Which of the following is NOT a term used to rank the distance between bars in a bar screen?
• What action should be taken in case of an acute MCL violation?
• What is calculated over the previous 12 months to determine compliance values for TTHM and HAA5 under the Stage 1 DBPR?
• What is an important aspect of maintaining a safe working environment in a water utility?
• The buildup of corrosion products is a process known as?
• What is the role of corrosion inhibitors in water treatment?
• Which organism is the hardest to eliminate effectively from water?
• What is the commercial purity range of fluorosilicic acid?
• Materials that form a precipitate with the sodium salt of fatty acids are referred to as what?
• What is the Maximum Contaminant Level (MCL) for nitrate in drinking water?
• In the ion-exchange softening process, what must be done once the resin no longer softens water?
• Which device consists of a pair of metallic plates that are separated by an insulating material called a dielectric?
• What effect do soft waters with a pH of less than 7 generally have on lead and copper?
• What are the primary reasons to control corrosion and scaling?
• When oxidized, iron and manganese can discolor water to which color range?
• In which type of aquifer could an artesian aquifer occur?
• What is the term used for the removal of settleable solids by gravity?
• What term describes the process of cloud formation?
• In what format should water quality records ideally be kept?
• What measurements are commonly used to express the concentration of solute in a solution?
• Which of the following statements is true regarding the filtration process?
• Which type of respirator supplies safe, grade D (or better) breathing air to the wearer?
• Which approach involves multiple treatment processes to remove various water contaminants?
• Which of the following is the only type of pump that can be operated against a closed valve?
• Which characteristic of sodium fluoride makes it suitable for water treatment?
• What is a common symptom of bronchial irritation caused by chemical exposure?
• Which type of fluoride chemical is recommended for use in downflow saturators?
• Which type of wells are used near the shore or river to obtain good-quality water?
• Which alternative can be used for softening that removes both carbonate and noncarbonate hardness?
• The main purpose of mechanical seals is to:
• What are the effects of manganese as a secondary contaminant in water?
• What is the most effective method for sequestering manganese in water treatment?
• How is water hardness expressed?
• What does the term 'decant' refer to in water treatment?
• Where is it best to keep main flushing records?
• What is the purpose of presedimentation in water treatment?
• At what stage is powdered activated carbon typically added during water treatment?
• What does SCBA stand for?
• What are the basic methods for controlling corrosion or scaling?
• A small amount of fluoride in the diet is essential for which of the following?
• What is considered the most common operational problem for wells?
• What term refers to the level of water surface in a well when no water is being taken from the aquifer?
• Which area of a basin provides the calm area necessary for the suspended material to settle?
• In direct filtration water treatment plants, which step of conventional treatment is excluded?
• What is the MCL goal for E. coli in microbiological contaminants?
• To prevent leakage at the point where the shaft protrudes through the case, ___ are used to seal the space between the shaft and the case.
• What is typically measured to ensure water quality during sanitary surveys?
• What is referred to as the breakpoint in the chlorination process?
• What types of water quality problems are caused by impoundment stratification?
• What term describes the process of replacing the final digits of a number with zeros?
• What are streams that flow only occasionally called?
• What is the importance of plant chemical usage records?
• Which part of a pump houses the packing or mechanical seal?
• What is described as water released from snow or ice in liquid form?
• When should you inject polyphosphates for effective iron and manganese sequestration?
• What type of pump is designed to be placed below the water level in a well?
• A small amount of fluoride in the diet serves what essential anatomical function?
• What does the term well yield refer to?
• What must be taken into account to ensure the cleanliness of a water well?
• What is the final step in the process of well construction?
• What is the Maximum Contaminant Level (MCL) for nitrite in drinking water?
• How do you convert 7.7 million gallons a day into cubic feet per second?
• What is the process in which ions are transferred through a membrane as a result of a direct electric current applied to the solution?
• Which membrane process is commonly referred to as a "softening" membrane?
• Which method is primarily utilized for the removal of dissolved salts from water?
• What is the role of flocculants in water treatment?
• Friction reduces the flow of water through a pipe like ____ reduces the flow of electricity through a wire.
• What is the maximum turbidity level of settled water before it is applied to the filters?
• How frequently do water plant operators take samples?
• What is the primary purpose of sedimentation in water treatment?
• Which type of pump is useful for moving water that contains solids, as in raw-water intakes?
• What is the equivalent of 35.1 cubic feet per second when converted to gallons per minute?
• Which process involves the agglomeration of particles into larger masses to facilitate their removal?
• How often should sedimentation basins with mechanical sludge removal equipment be drained and inspected?
• Fluoride is fed into the water system by either a solution feed system or a(n):
• Which is a principal problem associated with preliminary treatment screening?
• What is the typical opening size range for medium-ranked fixed screens or bar screens?
• What may the presence of iron or manganese in the distribution system indicate?
• What is a common effect of untreated corrosion in water pipes?
• If samples arrive at a laboratory past the specified holding time following collection, the laboratory:
• Under no circumstances should a composite sample be collected for which type of analysis?
• Where land is relatively flat, what happens to runoff?
• What is the most inexpensive chemical available for fluoridation?
• What is the maximum contaminant level for arsenic in drinking water?
• What are the two primary chemicals that contribute to water hardness?
• In solids-contact basins, how often should solids concentration be determined?
• What is the area of a circular reservoir with a diameter of 411 feet, expressed in square feet?
• What is the expected outcome of effective flocculation in water treatment?
• Which of the following processes is primarily used for the removal of contaminants in water treatment?
• What is the primary purpose of a sedimentation basin?
• What is the function of the sludge zone in a sedimentation basin?
• During filtration, what role does the action of straining suspended particles play?
• At what temperature range do fusible plugs on chlorine cylinders melt?
• What type of bacteria is commonly associated with fecal contamination in water?
• Which physical property is critical in the treatment of water?
• If 8.25 pounds of soda ash are mixed into 45 gallons of water, what is the resulting percentage of soda ash in the slurry?
• Which invasive species require monitoring and treatment to protect water bodies?
• What is the smallest particle that retains the characteristics of an element?
• Which oxidant should be introduced early in the treatment process for full reaction?
• What is the primary purpose of adding polyphosphates or sodium silicates to water before it is exposed to disinfectants?
• Which factor may allow higher dosages of disinfectant to require less contact time?
• What is a well casing?
• Electricity is often classified as either static or what?
• What is the primary use of SCBA in water treatment?
• Which treatment process is essential for removing pathogens from water?
• What is typically used to control iron bacteria in groundwater wells?
• What is the most important consideration during an automatic startup after a power failure?
• Which gas occurs mainly in groundwater, is heavier than air, and is odoriferous?
• Which organisms are commonly used to indicate the presence of pathogenic bacteria?
• Compared to gravimetric feeders, what are two advantages of volumetric feeders?
• What water quality problems are prevalent in groundwater?
• Who is responsible for safety and safe working conditions associated with a water utility?
• According to the SDWA, how is a public water system defined?
• Detention time in flocculation basins is usually designed to provide for how long?
• What type of record should be kept daily regarding fluoride levels?
• What is the purpose of keeping process records of raw water and finished water quality?
• Which of the following is typically NOT included in a sanitary survey?
• What does a positive repeat test for total coliform require?
• Which term describes substances that can conduct electricity in solution?
• Which type of pump is widely used for small, private wells because of its low initial cost and low maintenance?
• Which two principal chemicals are responsible for water hardness?
• What type of electrical current flows continuously in one direction?
• What happens in treatment plant operations if one of the operating conditions changes?
• To limit construction costs, a dam should be built with which of the following?
• What is the potential outcome of a system that serves fewer than 15 service connections as defined by the SDWA?
• Why is ultraviolet disinfection particularly suitable for groundwater treatment?
• What effect does activated silica have when used in proper dosage?
• What are the main causes of algae blooms in water bodies?
• What are some of the concerns about automatic control of treatment plant processes?
• What is the first pretreatment provided in most surface water treatment systems?
• What is the common term for the processes of mixing, flocculation, sedimentation, and filtration?
• Which two elements are primarily associated with hard water?
• Which of the following is an indicator of drinking water quality?
• Certain types of bacteria can accelerate the corrosion process by producing carbon dioxide and which other product?
• What defines a radical in chemistry?
• What should be done if a chemical inventory is running low?
• What chemical is typically used to disinfect gravel packing in groundwater wells?
• What is the frequency for checking fluoride levels in water treatment?
• Which of the following are the ideal indicators for pathogens?
• What is a common method to control turbidity in water systems?
• What describes drinking water that is pleasing to the taste?
• What should be kept in an organized manner for every chemical used in a water treatment plant?
• What is the implication of a sanitary survey finding issues in a water supply system?
• The number of monthly distribution system chlorine residual samples required is:
• Which property is NOT a physical property significant in water treatment?
• Which disinfectant by-product is monitored under the Stage 1 DBPR?
• What type of filter is known for its low construction costs?
• What is the primary effect of air stripping in water treatment?
• Which of the following is an advantage of slow sand filters?
• Give an example of feed-forward control.
• Which of the following is a common visual indicator of tuberculation?
• What happens to a filter as it ripens?
• Which statement is true regarding colloidal particles?
• Static electricity is often referred to as what?