Worksheetscold water 1
Total questions: 29
Worksheet time: 15mins
What is the primary role of the Water Regulations Advisory Scheme (WRAS)?
Operate public water treatment plants
Set national water tariffs and billing
Train plumbers for gas installations
Advise and approve compliant fittings
BS6700 focuses on which aspect of water services?
Water billing and metering fees
Legal enforcement and prosecution
Design, installation, testing, maintenance
Rainwater harvesting subsidies
Why must materials used for fittings be WRAS approved?
To allow higher water pressures
To reduce household energy consumption
To prevent contamination of the water
To meet fire safety requirements
In the diagram of the rain water cycle, which process is driven mainly by solar energy and moves water from surface to atmosphere?
Condensation into cloud droplets
Infiltration into soil layers
Runoff over land surfaces
Evaporation from lakes and seas
Which pair of processes transfers water from the atmosphere to land and then into the ground, as shown in the diagram?
Precipitation then infiltration
Evaporation then condensation
Condensation then evaporation
Transpiration then runoff
Which statement best describes precipitation in the water cycle?
Plants release moisture into the air
Water molecules separate and become vapor
Water molecules condense and fall as rain
Water moves downward through soil pores
Which option lists common surface water sources used for cold water distribution?
Desalination plants, marine intakes, pipelines
Rainwater tanks, roof catchments, gutters
Groundwater, aquifers, boreholes, wells
Lakes, reservoirs, rivers, streams
Which treatment chemical is commonly added to reduce phosphates during initial reservoir processing?
Calcium carbonate for softening only
Ferric sulphate for phosphate reduction
Potassium permanganate for taste only
Sodium chloride for disinfection only
Select the statements that best describe responsible pumping from a river to a reservoir.
Most pumping may occur in winter to protect flows
Levels must be monitored to avoid harming the river
Raw water is transferred via a pumping station
Pumping should ignore seasonal environmental impacts
Which list shows typical household cold water uses with higher proportions?
Cooking and drinking, gardening
Bathing and showering, flushing toilets
Washing clothes, hand basin use
Dishwashing, other household use
Which combination of actions occurs before water enters the reservoir?
Ozone gas disinfection
Screening to remove fish and debris
Granular carbon filtration
Addition of ferric sulphate to lower phosphates
What is the normal daily intake transfer capacity mentioned?
18 million litres per day
2,200 million litres per day
36 million litres per day
5 million litres per day
Which step happens at the treatment plant after water leaves the reservoir?
Water is disinfected with ozone
Water is pumped 5 km to site
Sludge is drawn off
Sand and carbon filters trap fine matter
Why does the draw-off tower take water from three different levels?
To match pipe diameter changes
To ensure the most suitable water
To increase reservoir capacity
To accelerate ozone contact time
During final treatment, what is the purpose of storing chlorinated water for a period of time?
Raise pH to neutral values
Allow sediment to fully settle
Remove dissolved oxygen from water
Let chlorine kill remaining bacteria
Which process is sometimes used alongside chlorination to further disinfect treated water?
Ion exchange softeners
Ultraviolet light treatment
Reverse osmosis membranes
Aeration cascade units
Before distribution to customers, which chemical is added to reduce chlorine levels?
Activated carbon slurry
Sulphur dioxide dosing
Calcium hypochlorite
Ozone gas injection
Select all actions that occur near the end of the treatment process before water enters mains.
Sulphur dioxide used to neutralize chlorine
Ozone introduced to storage tanks
Final pH adjustment stage
Chlorine addition for disinfection
A reservoir supplies about 150,000 homes. What routine practice ensures water quality throughout the day?
Regular sampling to meet standards
Night‑only pump operation schedule
Weekly manual inspection of pipes
Daily addition of activated carbon
Which pipe material has largely replaced cast iron for new domestic service connections?
MDPE plastic
Copper tube
Galvanized steel
PVC-U rigid
From a 600 mm trunk main, which set lists typical smaller distribution diameters used to serve areas?
160 mm, 125 mm, 110 mm
100 mm, 63 mm, 50 mm
90 mm, 75 mm, 40 mm
32 mm, 25 mm, 20 mm
How are MDPE joints most commonly made on distribution services?
Fusion welded with compression fittings
Soldered capillary joins
Threaded galvanized couplers
Adhesive solvent welding
What is the function of the screwdown ferrule connector or service union installed on cast iron or MDPE mains?
Prevents pipe corrosion and scaling
Measures household flow rate
Reduces pressure to fixtures
Allows a valve to be opened or closed
Which tool is used to operate the service valve fitted to a ferrule connector?
A ferrule key
An adjustable wrench
A pipe cutter
A torque bar
In a typical water distribution system, what component initially feeds the network of mains to streets and houses?
Rainwater storage tank
Household stop valve
Local booster pump
Water treatment plant
In the diagram, the blue pipe runs from the boundary stop tap into the building. What is this pipe legally called?
Communication pipe
Rising main
Service pipe
Supply main
Which component in the diagram marks the point where responsibility changes from the water undertaker to the property owner?
Boundary stop tap
Internal stop valve
Communication pipe
Service pipe
In the installation shown, the blue pipe crosses the site to the building. Where should the boundary stop tap be located relative to this run?
Inside the kitchen by the sink
On the municipal main inside the house
At or just outside the property boundary
Midway along the garden trench
When connecting a new property to the public main, which pipe links the main to the boundary stop tap?
Rising main inside the building
Communication pipe from main to boundary
Service pipe from boundary to premises
Cold feed from storage cistern
