Water Supply and Wastewater Engineering MCQs (Part-6)
What is the purpose of a water distribution network?
A Filter water
B Distribute water
C Store water
D Pump water
A water distribution network is responsible for transporting treated water from the treatment plant to homes, businesses, and industries, ensuring a continuous and reliable supply of potable water.
Which material is commonly used in water pipes for its corrosion resistance?
A PVC
B Steel
C Concrete
D Copper
PVC (Polyvinyl Chloride) is widely used in water distribution systems due to its resistance to corrosion, lightweight, ease of installation, and cost-effectiveness, making it an ideal choice for most water pipes.
What is the main function of a pumping station?
A Store water
B Treat water
C Pump water
D Filter water
A pumping station’s primary function is to move water through pipelines, especially when gravity alone cannot maintain the required flow. It is essential for ensuring adequate water supply across long distances or elevated areas.
What is the purpose of coagulation in water treatment?
A Remove bacteria
B Filter water
C Add disinfectants
D Bind small particles
Coagulation involves adding chemicals that cause tiny particles in water to clump together, forming larger aggregates called flocs. These flocs are then removed through sedimentation or filtration to improve water quality.
Which water treatment method uses a semi-permeable membrane to remove impurities?
A Sedimentation
B Filtration
C Reverse osmosis
D Chlorination
Reverse osmosis is a filtration method that uses a semi‐permeable membrane to remove dissolved salts, minerals, and other impurities from water, making it suitable for drinking or industrial use.
What is the main function of sedimentation in water treatment?
A Add oxygen
B Remove large particles
C Remove bacteria
D Raise pH
Sedimentation is a process where heavy particles in water settle to the bottom due to gravity. This step helps to remove larger particles before further treatment like filtration or disinfection.
What type of system is used to remove suspended solids from wastewater?
A Sedimentation
B Aeration
C Coagulation
D Filtration
Sedimentation is a key process in wastewater treatment, where gravity allows heavier solids to settle at the bottom of a tank. This helps to reduce turbidity and makes water easier to treat in subsequent steps.
What does a combined sewer system carry?
A Only sewage
B Only industrial waste
C Both stormwater and sewage
D Stormwater
A combined sewer system collects both stormwater runoff and sewage in the same pipes. This system is prone to overflows during heavy rains, which can lead to untreated discharge into water bodies.
What is the main role of filtration in water treatment?
A Remove gases
B Add chlorine
C Remove bacteria
D Remove solids
Filtration is used to remove suspended solids like dirt, debris, and microorganisms from water. It improves the clarity and quality of water, preparing it for disinfection or further treatment steps.
What is a major concern with combined sewer overflows (CSOs)?
A Decreased water supply
B Contaminated water release
C Water loss
D Excessive filtration
CSOs occur when combined sewer systems overflow during heavy rainfall, discharging untreated sewage and stormwater into rivers or streets. This can contaminate water bodies and pose public health risks.
What is used to disinfect water by killing harmful microorganisms?
A Chlorination
B Sedimentation
C Reverse osmosis
D Coagulation
Chlorination is the process of adding chlorine or chlorine compounds to water to kill harmful bacteria, viruses, and other pathogens, making water safe for drinking and other uses.
Which type of pipe is commonly used for sewer systems?
A PVC
B Copper
C Cast iron
D Steel
Cast iron pipes are commonly used in sewer systems due to their durability and resistance to corrosion. They can handle high pressure and are suitable for underground installations, ensuring long-term functionality.
What is desalination used for in water treatment?
A Remove solids
B Remove bacteria
C Increase pH
D Remove salts
Desalination is the process of removing salts and minerals from seawater or brackish water. It is used to produce fresh water for drinking and agriculture in regions with limited access to natural freshwater sources.
What is the purpose of a storage reservoir in water supply systems?
A Pump water
B Store water
C Filter water
D Treat water
A storage reservoir is used to store large amounts of water, ensuring a stable supply for periods of high demand. It also provides a buffer during maintenance or emergencies, ensuring consistent distribution.
What is the main purpose of a sewer design?
A Collect wastewater
B Add disinfectants
C Filter wastewater
D Distribute water
Sewer design focuses on creating efficient systems to collect wastewater from homes, industries, and businesses, transporting it to treatment plants for safe disposal or reuse, thereby preventing pollution and maintaining sanitation.