B Exam Practice Questions And Correct

Groundwater Treatment Operator Class B Exam Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of a groundwater treatment plant?
• Remove dissolved gases from water
• Remove turbidity and suspended solids
• Provide safe drinking water by removing contaminants
• Treat wastewater for discharge
• Provide safe drinking water by removing contaminants

Rationale: The primary purpose of a groundwater treatment plant is

to make water safe for consumption by removing harmful contaminants, including chemical and microbial impurities. 1 / 4

• Which of the following is a common coagulant used in groundwater

treatment?

• Sodium hypochlorite
• Ferric chloride
• Sodium fluoride
• Calcium carbonate
• Ferric chloride

Rationale: Ferric chloride is widely used as a coagulant to remove

suspended particles by causing them to clump together and settle.

• In groundwater systems, what is the most common disinfectant used?
• Chlorine
• Ozone
• UV radiation
• Hydrogen peroxide
• Chlorine

Rationale: Chlorine is commonly used in groundwater treatment due

to its effectiveness, ease of use, and residual disinfection capability.

• What is the typical pH range for optimal coagulation in groundwater

treatment?

A. 4.0–5.0

B. 5.5–7.5

C. 8.0–9.5

D. 10.0–11.0 2 / 4

B. 5.5–7.5

Rationale: Coagulation works most effectively in slightly acidic to

neutral conditions, typically between 5.5 and 7.5.

• Which parameter is used to measure the efficiency of a filtration

system?

• pH
• Turbidity
• Temperature
• Conductivity
• Turbidity

Rationale: Turbidity is a measure of suspended solids in water and is

commonly used to evaluate filtration efficiency.

• What is the primary purpose of aeration in groundwater treatment?
• Reduce hardness
• Remove dissolved gases and oxidize iron or manganese
• Increase turbidity
• Increase alkalinity
• Remove dissolved gases and oxidize iron or manganese

Rationale: Aeration helps remove dissolved gases such as hydrogen

sulfide and oxidizes iron and manganese for easier removal by filtration.

• Which of the following is an advantage of slow sand filtration?
• High flow rate 3 / 4

• Low maintenance and effective biological treatment
• Chemical-free disinfection
• Can handle large volumes of water quickly
• Low maintenance and effective biological treatment

Rationale: Slow sand filters rely on biological action to remove

contaminants and require minimal chemical treatment, making them low maintenance.

• What is the main goal of pH adjustment in groundwater treatment?
• Improve taste
• Prevent pipe corrosion and optimize chemical treatment
• Remove pathogens
• Remove hardness
• Prevent pipe corrosion and optimize chemical treatment

Rationale: pH adjustment is important for protecting distribution

systems from corrosion and enhancing coagulation and disinfection efficiency.

• Which compound is commonly used to remove iron and manganese

from groundwater?

• Sodium bicarbonate
• Potassium permanganate
• Aluminum sulfate
• Chlorine dioxide
• Potassium permanganate
• / 4