Water Supply and Wastewater Engineering MCQs (Part-7)
What is the primary function of sewer systems?
A Pump water
B Filter water
C Collect wastewater
D Store water
Sewer systems are designed to collect and transport wastewater from households, industries, and other sources to treatment plants or disposal areas. This ensures the safe disposal of wastewater and prevents environmental contamination.
Which system collects both stormwater and sewage?
A Combined sewer system
B Stormwater system
C Greywater system
D Separate sewer system
A combined sewer system carries both stormwater and sewage in the same pipes. While this system is efficient, it can overflow during heavy rains, causing untreated wastewater to discharge into water bodies.
What is stormwater management aimed at preventing?
A Water scarcity
B Flooding
C Wastewater production
D Water contamination
Stormwater management systems are designed to control the flow of stormwater runoff, prevent flooding, and reduce the risk of waterlogging by using drainage systems, retention ponds, and other techniques.
Which material is commonly used in sewer pipe construction?
A Concrete
B PVC
C Steel
D Cast iron
Cast iron is widely used in sewer pipe construction due to its strength, durability, and resistance to corrosion. It is especially useful for handling the pressures and demands of wastewater systems.
What is the role of sludge management in wastewater treatment?
A Treat sludge
B Remove sludge
C Collect sludge
D Pump sludge
Sludge management is crucial for treating the solid waste produced during wastewater treatment. Proper handling, such as thickening, stabilization, and dewatering, ensures safe disposal or potential reuse in agriculture or energy production.
What does wastewater reuse involve?
A Storing water for reuse
B Treating water for consumption
C Reusing sink and shower water
D Treating water for irrigation
Wastewater reuse involves treating wastewater to a level where it can be safely used for non-potable purposes such as irrigation. This helps conserve freshwater resources and supports sustainable water management practices.
What is a primary concern of combined sewer overflows (CSOs)?
A Wastewater treatment
B Pollution in water bodies
C Water conservation
D Efficient filtration
CSOs occur when a combined sewer system overflows during heavy rainfall, discharging untreated sewage and stormwater into rivers or streets. This can lead to pollution and pose public health risks in affected areas.
What is an essential feature of a separate sewer system?
A Reuses wastewater
B Combines stormwater and sewage
C Filters wastewater
D Separates stormwater and sewage
A separate sewer system is designed to carry stormwater and sewage in separate pipes. This helps prevent the overloading of treatment plants and reduces the risk of untreated wastewater being released into water bodies.
What is the function of a stormwater detention basin?
A Store stormwater
B Pump stormwater
C Filter water
D Treat wastewater
A stormwater detention basin is designed to temporarily store excess rainwater during heavy rainfall. It helps control runoff, reduces the risk of flooding, and allows stormwater to be gradually released into drainage systems.
What type of system is used to treat wastewater in rural areas?
A Reverse osmosis
B Septic system
C Filtration system
D Sewage treatment plant
Septic systems are commonly used in rural or off-grid areas to treat wastewater on-site. They consist of a tank that separates solids and liquids, with the effluent being filtered through the soil for safe disposal.
What does the term “greywater” refer to?
A Rainwater
B Water from toilets
C Water from kitchen sinks
D Wastewater from toilets
Greywater is the wastewater generated from sinks, showers, laundry, and other domestic activities, excluding toilets. It can be treated and reused for non-potable purposes such as irrigation or flushing toilets.
What is a key benefit of wastewater reuse?
A Improves water quality
B Increases water demand
C Reduces energy consumption
D Conserves freshwater resources
Wastewater reuse helps conserve freshwater resources by treating and reusing wastewater for non-potable purposes, such as irrigation or industrial processes. This reduces the strain on natural freshwater sources.
What is the purpose of sedimentation in wastewater treatment?
A Increase oxygen levels
B Remove suspended solids
C Add disinfectants
D Kill bacteria
Sedimentation is a physical process that allows larger, heavier particles in wastewater to settle at the bottom of a tank. This helps to reduce the amount of suspended solids and prepares the water for further treatment.
Which treatment process removes particles from water by flocculation?
A Coagulation
B Aeration
C Filtration
D Sedimentation
Coagulation involves adding chemicals to water that bind small particles together, causing them to form larger clumps or flocs. These flocs are then removed through sedimentation or filtration, improving water quality.
What is the goal of stormwater management?
A Increase water supply
B Reuse wastewater
C Control water flow
D Reduce water temperature
The goal of stormwater management is to control the flow of rainwater, preventing flooding, waterlogging, and erosion. It involves designing systems to collect, store, and safely discharge stormwater.